Space

nasa-lays-out-how-spacex-will-refuel-starships-in-low-earth-orbit

NASA lays out how SpaceX will refuel Starships in low-Earth orbit

artemis, artemis iii, NASA, orbital refueling, Science, Space, spacex, starship / /
Artist's illustration of two Starships docked belly-to-belly in orbit.

Enlarge / Artist’s illustration of two Starships docked belly-to-belly in orbit.

SpaceX

Some time next year, NASA believes SpaceX will be ready to link two Starships in orbit for an ambitious refueling demonstration, a technical feat that will put the Moon within reach.

SpaceX is under contract with NASA to supply two human-rated Starships for the first two astronaut landings on the Moon through the agency’s Artemis program, which aims to return people to the lunar surface for the first time since 1972. The first of these landings, on NASA’s Artemis III mission, is currently targeted for 2026, although this is widely viewed as an ambitious schedule.

Last year, NASA awarded a contract to Blue Origin to develop its own human-rated Blue Moon lunar lander, giving Artemis managers two options for follow-on missions.

Designers of both landers were future-minded. They designed Starship and Blue Moon for refueling in space. This means they can eventually be reused for multiple missions, and ultimately, could take advantage of propellants produced from resources on the Moon or Mars.

Amit Kshatriya, who leads the “Moon to Mars” program within NASA’s exploration division, outlined SpaceX’s plan to do this in a meeting with a committee of the NASA Advisory Council on Friday. He said the Starship test program is gaining momentum, with the next test flight from SpaceX’s Starbase launch site in South Texas expected by the end of May.

“Production is not the issue,” Kshatriya said. “They’re rolling cores out. The engines are flowing into the factory. That is not the issue. The issue is it is a significant development challenge to do what they’re trying to do … We have to get on top of this propellant transfer problem. It is the right problem to try and solve. We’re trying to build a blueprint for deep space exploration.”

Road map to refueling

Before getting to the Moon, SpaceX and Blue Origin must master the technologies and techniques required for in-space refueling. Right now, SpaceX is scheduled to attempt the first demonstration of a large-scale propellant transfer between two Starships in orbit next year.

There will be at least several more Starship test flights before then. During the most recent Starship test flight in March, SpaceX conducted a cryogenic propellant transfer test between two tanks inside the vehicle. This tank-to-tank transfer of liquid oxygen was part of a demonstration supported with NASA funding. Agency officials said this demonstration would allow engineers to learn more about how the fluid behaves in a low-gravity environment.

Kshatriya said that while engineers are still analyzing the results of the cryogenic transfer demonstration, the test on the March Starship flight “was successful by all accounts.”

“That milestone is behind them,” he said Friday. Now, SpaceX will move out with more Starship test flights. The next launch will try to check off a few more capabilities SpaceX didn’t demonstrate on the March test flight.

These will include a precise landing of Starship’s Super Heavy booster in the Gulf of Mexico, which is necessary before SpaceX tries to land the booster back at its launch pad in Texas. Another objective will likely be the restart of a single Raptor engine on Starship in flight, which SpaceX didn’t accomplish on the March flight due to unexpected roll rates on the vehicle as it coasted through space. Achieving an in-orbit engine restart—necessary to guide Starship toward a controlled reentry—is a prerequisite for future launches into a stable higher orbit, where the ship could loiter for hours, days, or weeks to deploy satellites and attempt refueling.

In the long run, SpaceX wants to ramp up the Starship launch cadence to many daily flights from multiple launch sites. To achieve that goal, SpaceX plans to recover and rapidly reuse Starships and Super Heavy boosters, building on expertise from the partially reusable Falcon 9 rocket. Elon Musk, SpaceX’s founder and CEO, is keen on reusing ships and boosters as soon as possible. Earlier this month, Musk said he is optimistic SpaceX can recover a Super Heavy booster in Texas later this year and land a Starship back in Texas sometime next year.

NASA lays out how SpaceX will refuel Starships in low-Earth orbit Read More »

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Rocket Report: SLS workforce cuts; New Glenn launch to launch in the early fall

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All the news that’s fit to lift —

“This is a vital component in our preparations for launch.”

–

The flight hardware core stage for Europe’s new rocket, Ariane 6, is moved onto the launch pad for the first time this week. A launch is possible some time this summer.

Enlarge / The flight hardware core stage for Europe’s new rocket, Ariane 6, is moved onto the launch pad for the first time this week. A launch is possible some time this summer.

ESA-M. Pédoussaut

Welcome to Edition 6.41 of the Rocket Report! As I finish up this edition I’m listening to the post-Flight Readiness Review news conference for Boeing’s Crew Flight Test. It sounds like everything remains on track for a launch attempt on May 6, at 10: 34 pm ET. It’s exciting to see this important milestone for Boeing and the US human spaceflight program so near to hand.

As always, we welcome reader submissions, and if you don’t want to miss an issue, please subscribe using the box below (the form will not appear on AMP-enabled versions of the site). Each report will include information on small-, medium-, and heavy-lift rockets as well as a quick look ahead at the next three launches on the calendar.

Shetland spaceport advancing toward launch. SaxaVord Spaceport in Scotland is on track to launch the United Kingdom’s first vertical rocket into orbit, the BBC reports. The Civil Aviation Authority has granted a range license to the Scottish spaceport, which will allow the company to control the sea and airspace during launch. Previously, the site received a spaceport license in December 2023. Ambitiously, the facility aims to launch up to 30 rockets every year.

From Germany to Scotland with love … “This is a vital component in our preparations for launch,” said Frank Strang, chief executive of SaxaVord Spaceport. “As Western Europe’s only fully licensed vertical launch spaceport, we are now preparing to make more space history with the beginning of orbital launch operations well underway.” Germany-based rocket manufacturer Rocket Factory Augsburg could be the first to launch an orbital mission from Shetland later this year. (submitted by Ken the Bin)

Rocket Lab launches 5th Electron this year. Rocket Lab launched a South Korean smallsat and a NASA solar sail experiment on the company’s fifth flight of the year on Tuesday, Space News reports. NEONSAT-1, the primary payload of the mission, is an imaging satellite with a mass of about 100 kilograms. The spacecraft is part of a constellation of 11 spacecraft called New-space Earth Observation Satellite Constellation for National Safety, with the other 10 to be launched by South Korea’s Nuri rocket in 2026 and 2027.

Better get busy … This was the first Electron launch in more than a month after a mission for the National Reconnaissance Office on March 21 from Rocket Lab’s Launch Complex 2 in Virginia. Company executives said in an earnings call in February that the company has 22 Electron launches planned for the year, two of which are of its HASTE suborbital version. That would be an impressive total if Rocket Lab can achieve it. (submitted by Jay500001)

The easiest way to keep up with Eric Berger’s space reporting is to sign up for his newsletter, we’ll collect his stories in your inbox.

PLD Space has raised 120 million euros. The Spanish launch startup revealed this week that it has raised 120 million euros to date, providing the funding needed to launch its orbital Miura 5 rocket by the end of 2025. Last October the company’s smaller, suborbital Miura 1 rocket made what the company characterized as a “successful” test flight, reaching an altitude of 46 km. By my very rough rule of thumb, a launch company must have at least $100 million in funding to have a fighting chance to reach orbit.

Building new buildings … The Miura 5 vehicle is intended to have a capacity of up to 250 kg in low-Earth orbit. The new funding will mainly be used for the expansion of PLD Space’s infrastructure, increasing the size of its facilities from 169,000 to 834,000 square meters. The company also plans to begin building a launch site for the Miura 5 rocket in Kourou, French Guiana, later this year. (submitted by Ken the Bin and EllPeaTea)

SpaceX lands 300th Falcon booster. With the launch of a Starlink mission on Tuesday evening and subsequent return of the Falcon 9 first stage, SpaceX recorded its 300th successful booster landing. In the Falcon fleet’s lifetime, SpaceX has now landed about 85 percent of the Falcon rockets it has launched, Ars reports. These days, more than 90 percent of all its missions launch on previously flown boosters. So, rocket recycling is totally a thing.

Saving a lot of metal … Landing 300 rockets means SpaceX has preserved 2,700 Merlin rocket engines. In round numbers, the dry mass of a Falcon 9 first stage is about 50 metric tons, so the landing of all these rockets has prevented 15,000 metric tons of metal and other materials from being dumped into the oceans. To put this number further into perspective, only a handful of rockets have ever launched more than 300 times, and they are all Russian.

China launches astronaut mission. A Long March 2F rocket lifted off from the Jiuquan Satellite Launch Center in the Gobi Desert on Thursday, carrying the Shenzhou 18 spacecraft and its three-person crew into orbit, Space.com reports. Shenzhou 18 is commanded by Ye Guangfu, 43, who was part of the Shenzhou 13 mission three years ago. Fighter pilots Li Cong, 34, and Li Guangsu, 36, both spaceflight rookies, make up the rest of the crew.

A change in control … The three will spend around six months in space. Their spacecraft is scheduled to reach the Tiangong space station 6.5 hours after launch. The trio will be greeted aboard the orbital outpost by Tang Hongbo, Tang Shengjie, and Jiang Xinlin, who make up the Shenzhou 17 crew. The latter three will soon complete their six months in orbit. (submitted by Ken the Bin and EllPeaTea)

Rocket Report: SLS workforce cuts; New Glenn launch to launch in the early fall Read More »

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NASA still doesn’t understand root cause of Orion heat shield issue

artemis, artemis II, human spaceflight, Lockheed Martin, moon, NASA, orion, Space / /

Flight rationale —

“When we stitch it all together, we’ll either have flight rationale or we won’t.”

–

NASA's Orion spacecraft descends toward the Pacific Ocean on December 11, 2021, at the end of the Artemis I mission.

Enlarge / NASA’s Orion spacecraft descends toward the Pacific Ocean on December 11, 2021, at the end of the Artemis I mission.

NASA

NASA officials declared the Artemis I mission successful in late 2021, and it’s hard to argue with that assessment. The Space Launch System rocket and Orion spacecraft performed nearly flawlessly on an unpiloted flight that took it around the Moon and back to Earth, setting the stage for the Artemis II, the program’s first crew mission.

But one of the things engineers saw on Artemis I that didn’t quite match expectations was an issue with the Orion spacecraft’s heat shield. As the capsule streaked back into Earth’s atmosphere at the end of the mission, the heat shield ablated, or burned off, in a different manner than predicted by computer models.

More of the charred material than expected came off the heat shield during the Artemis I reentry, and the way it came off was somewhat uneven, NASA officials said. Orion’s heat shield is made of a material called Avcoat, which is designed to burn off as the spacecraft plunges into the atmosphere at 25,000 mph (40,000 km per hour). Coming back from the Moon, Orion encountered temperatures up to 5,000° Fahrenheit (2,760° Celsius), hotter than a spacecraft sees when it reenters the atmosphere from low-Earth orbit.

Despite heat shield issue, the Orion spacecraft safely splashed down in the Pacific Ocean. Engineers discovered the uneven charring during post-flight inspections.

No answers yet

Amit Kshatriya, who oversees development for the Artemis missions in NASA’s exploration division, said Friday that the agency is still looking for the root cause of the heat shield issue. Managers want to be sure they understand the cause before proceeding with Artemis II, which will send astronauts Reid Wiseman, Victor Glover, Christina Koch, and Jeremy Hansen on a 10-day flight around the far side of the Moon.

This will be the first time humans fly near the Moon since the last Apollo mission in 1972. In January, NASA announced a delay in the launch of Artemis II from late 2024 until September 2025, largely due to the unresolved investigation into the heat shield issue.

“We are still in the middle of our investigation on the performance of the heat shield from Artemis I,” Kshatriya said Friday in a meeting with a committee of the NASA Advisory Council.

Engineers have performed sub-scale heat shield tests in wind tunnels and arc jet facilities to better understand what led to the uneven charring on Artemis I. “We’re getting close to the final answer in terms of that cause,” Kshatriya said.

NASA officials previously said it is unlikely they will need to make changes to the heat shield already installed on the Orion spacecraft for Artemis II, but haven’t ruled it out. A redesign or modifications to the Orion heat shield on Artemis II would probably delay the mission by at least a year.

Instead, engineers are analyzing all of the possible trajectories the Orion spacecraft could fly when it reenters the atmosphere at the end of the Artemis II mission. On Artemis I, Orion flew a skip reentry profile, where it dipped into the atmosphere, skipped back into space, and then made a final descent into the atmosphere, sort of like a rock skipping across a pond. This profile allows Orion to make more precise splashdowns near recovery teams in the Pacific Ocean and reduces g-forces on the spacecraft and the crew riding inside. It also splits up the heat load on the spacecraft into two phases.

The Apollo missions flew a direct reentry profile. There is also a reentry mode available called a ballistic entry, in which the spacecraft would fly through the atmosphere unguided.

Ground teams at NASA's Kennedy Space Center in Florida moved the Orion spacecraft for the Artemis II mission into an altitude chamber earlier this month.

Enlarge / Ground teams at NASA’s Kennedy Space Center in Florida moved the Orion spacecraft for the Artemis II mission into an altitude chamber earlier this month.

The charred material began flying off the heat shield in the first phase of the skip reentry. Engineers are looking at how the skip reentry profile affected the performance of the Orion heat shield. NASA wants to understand how the Orion heat shield would perform during each of the possible reentry trajectories for Artemis II.

“What we have the analysis teams off doing is saying, ‘OK, independent of what the constraints are going to be, what can we tolerate?” Kshatriya said.

Once officials understand the cause of the heat shield charring, engineers will determine what kind of trajectory Artemis II needs to fly on reentry to minimize risk to the crew. Then, managers will look at building what NASA calls flight rationale. Essentially, this is a process of convincing themselves the spacecraft is safe to fly.

“When we stitch it all together, we’ll either have flight rationale or we won’t,” Kshatriya said.

Assuming NASA approves the flight rationale for Artemis II, there will be additional discussions about how to ensure Orion heat shields are safe to fly on downstream Artemis missions, which will have higher-speed reentry profiles as astronauts return from landings on the Moon.

In the meantime, preparations on the Orion spacecraft for Artemis II continue at NASA’s Kennedy Space Center. The crew and service modules for Artemis II were mated together earlier this year, and the entire Orion spacecraft is now inside a vacuum chamber for environmental testing.

NASA still doesn’t understand root cause of Orion heat shield issue Read More »

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Russia stands alone in vetoing UN resolution on nuclear weapons in space

anti-satellite tests, military space, Nuclear weapons, russia, Science, Space, United Nations / /

ASAT —

“The United States assesses that Russia is developing a new satellite carrying a nuclear device.”

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A meeting of the UN Security Council on April 14.

Enlarge / A meeting of the UN Security Council on April 14.

Russia vetoed a United Nations Security Council resolution Wednesday that would have reaffirmed a nearly 50-year-old ban on placing weapons of mass destruction into orbit, two months after reports Russia has plans to do just that.

Russia’s vote against the resolution was no surprise. As one of the five permanent members of the Security Council, Russia has veto power over any resolution that comes before the body. China abstained from the vote, and 13 other members of the Security Council voted in favor of the resolution.

If it passed, the resolution would have affirmed a binding obligation in Article IV of the 1967 Outer Space Treaty, which says nations are “not to place in orbit around the Earth any objects carrying nuclear weapons or any other kinds of weapons of mass destruction.”

Going nuclear

Russia is one of 115 parties to the Outer Space Treaty. The Security Council vote Wednesday follows reports in February that Russia is developing a nuclear anti-satellite weapon.

“The United States assesses that Russia is developing a new satellite carrying a nuclear device,” said Jake Sullivan, President Biden’s national security advisor. “We have heard President Putin say publicly that Russia has no intention of deploying nuclear weapons in space. If that were the case, Russia would not have vetoed this resolution.”

The United States and Japan proposed the joint resolution, which also called on nations not to develop nuclear weapons or any other weapons of mass destruction designed to be placed into orbit around the Earth. In a statement, US and Japanese diplomats highlighted the danger of a nuclear detonation in space. Such an event would have “grave implications for sustainable development, and other aspects of international peace and security,” US officials said in a press release.

With its abstention from the vote, “China has shown that it would rather defend Russia as its junior partner, than safeguard the global nonproliferation regime,” said Linda Thomas-Greenfield, the US ambassador to the UN.

US government officials have not offered details about the exact nature of the anti-satellite weapon they say Russia is developing. A nuclear explosion in orbit would destroy numerous satellites—from many countries—and endanger astronauts. Space debris created from a nuclear detonation could clutter orbital traffic lanes needed for future spacecraft.

The Soviet Union launched more than 30 military satellites powered by nuclear reactors. Russia’s military space program languished in the first couple of decades after the fall of the Soviet Union, and US intelligence officials say it still lags behind the capabilities possessed by the US Space Force and the Chinese military.

Russia’s military funding has largely gone toward the war in Ukraine for the last two years, but Putin and other top Russian officials have raised threats of nuclear force and attacks on space assets against adversaries. Russia’s military launched a cyberattack against a commercial satellite communications network when it invaded Ukraine in 2022.

Russia has long had an appetite for anti-satellite (ASAT) weapons. The Soviet Union experimented with “co-orbital” ASATs in the 1960s and 1970s. When deployed, these co-orbital ASATs would have attacked enemy satellites by approaching them and detonating explosives or using a grappling arm to move the target out of orbit.

Russian troops at the Plesetsk Cosmodrome in far northern Russia prepare for the launch of a Soyuz rocket with the Kosmos 2575 satellite in February.

Enlarge / Russian troops at the Plesetsk Cosmodrome in far northern Russia prepare for the launch of a Soyuz rocket with the Kosmos 2575 satellite in February.

Russian Ministry of Defense

In 1987, the Soviet Union launched an experimental weapons platform into orbit to test laser technologies that could be used against enemy satellites. Russia shot down one of its own satellites in 2021 in a widely condemned “direct ascent” ASAT test. This Russian direct ascent ASAT test followed demonstrations of similar capability by China, the United States, and India. Russia’s military has also demonstrated satellites over the last decade that could grapple onto an adversary’s spacecraft in orbit, or fire a projectile to take out an enemy satellite.

These ASAT capabilities could destroy or disable one enemy satellite at a time. The US Space Force is getting around this threat by launching large constellations of small satellites to augment the military’s much larger legacy communications, surveillance, and missile warning spacecraft. A nuclear ASAT weapon could threaten an entire constellation or render some of space inaccessible due to space debris.

Russia’s ambassador to the UN, Vasily Nebenzya, called this week’s UN resolution “an unscrupulous play of the United States” and a “cynical forgery and deception.” Russia and China proposed an amendment to the resolution that would have banned all weapons in space. This amendment got the support of about half of the Security Council but did not pass.

Outside the 15-member Security Council, the original resolution proposed by the United States and Japan won the support of more than 60 nations as co-sponsors.

“Regrettably, one permanent member decided to silence the critical message we wanted to send to the present and future people of the world: Outer space must remain a domain of peace, free of weapons of mass destruction, including nuclear weapons,” said Kazuyuki Yamazaki, Japan’s ambassador to the UN.

Russia stands alone in vetoing UN resolution on nuclear weapons in space Read More »

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NASA officially greenlights $3.35 billion mission to Saturn’s moon Titan

Science, Space / /
Artist's illustration of Dragonfly soaring over the dunes of Titan.

Enlarge / Artist’s illustration of Dragonfly soaring over the dunes of Titan.

NASA has formally approved the robotic Dragonfly mission for full development, committing to a revolutionary project to explore Saturn’s largest moon with a quadcopter drone.

Agency officials announced the outcome of Dragonfly’s confirmation review last week. This review is a checkpoint in the lifetime of most NASA projects and marks the moment when the agency formally commits to the final design, construction, and launch of a space mission. The outcome of each mission’s confirmation review typically establishes a budgetary and schedule commitment.

“Dragonfly is a spectacular science mission with broad community interest, and we are excited to take the next steps on this mission,” said Nicky Fox, associate administrator of NASA’s science mission directorate. “Exploring Titan will push the boundaries of what we can do with rotorcraft outside of Earth.”

In the case of Dragonfly, NASA confirmed the mission with a total lifecycle cost of $3.35 billion and a launch date of July 2028. That is roughly twice the mission’s original proposed cost and a delay of more than two years from when the mission was originally selected in 2019, according to NASA.

Busting the cost cap

Rising costs are not necessarily a surprise on a mission as innovative as Dragonfly. After reaching Titan, the eight-bladed rotorcraft lander will soar from place to place on Saturn’s hazy moon, exploring environments rich in organic molecules, the building blocks of life.

Dragonfly will be the first mobile robot explorer to land on any other planetary body besides the Moon and Mars, and only the second flying drone to explore another planet. NASA’s Ingenuity helicopter on Mars was the first. Dragonfly will be more than 200 times as massive as Ingenuity and will operate six times farther from Earth.

Despite its distant position in the cold outer Solar System, Titan appears to be reminiscent of the ancient Earth. A shroud of orange haze envelops Saturn’s largest moon, and Titan’s surface is covered with sand dunes and methane lakes.

Titan’s frigid temperatures—hovering near minus 290° Fahrenheit (minus 179° Celsius)—mean water ice behaves like bedrock. NASA’s Cassini spacecraft, which flew past Titan numerous times before its mission ended in 2017, discovered weather systems on the hazy moon. Observations from Cassini found evidence for hydrocarbon rains and winds that appear to generate waves in Titan’s methane lakes.

Clearly, Titan is an exotic world. Most of what scientists know about Titan comes from measurements collected by Cassini and the European Space Agency’s Huygens probe, which Cassini released to land on Titan in 2005. Huygens returned the first pictures from Titan’s surface, but it only transmitted data for 72 minutes.

Dragonfly will explore Titan for around three years, flying tens of kilometers about once per month to measure the prebiotic chemistry of Titan’s surface, study its soupy atmosphere, and search for biosignatures that could be indications of life. The mission will visit more than 30 locations within Titan’s equatorial region, according to a presentation by Elizabeth Turtle, Dragonfly’s principal investigator at the Johns Hopkins University Applied Physics Laboratory.

“The Dragonfly mission is an incredible opportunity to explore an ocean world in a way that we have never done before,” Turtle said in a statement. “The team is dedicated and enthusiastic about accomplishing this unprecedented investigation of the complex carbon chemistry that exists on the surface of Titan and the innovative technology bringing this first-of-its-kind space mission to life.”

However, this high level of ambition comes at a high cost. NASA selected Dragonfly to proceed into initial development in 2019. Turtle’s science team proposed Dragonfly to NASA through the agency’s New Frontiers program, which has developed a series of medium-class Solar System exploration missions. The New Frontiers program has an impressive pedigree, beginning with the New Horizons mission that flew by Pluto in 2015, the Juno mission to Jupiter, and the OSIRIS-REx asteroid sample return mission.

NASA officially greenlights $3.35 billion mission to Saturn’s moon Titan Read More »

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NASA may alter Artemis III to have Starship and Orion dock in low-Earth orbit

Science, Space / /
This image taken by NASA's Orion spacecraft shows its view just before the vehicle flew behind the Moon in 2022.

Enlarge / This image taken by NASA’s Orion spacecraft shows its view just before the vehicle flew behind the Moon in 2022.

NASA

Although NASA is unlikely to speak about it publicly any time soon, the space agency is privately considering modifications to its Artemis plan to land astronauts on the surface of the Moon later this decade.

Multiple sources have confirmed that NASA is studying alternatives to the planned Artemis III landing of two astronauts on the Moon, nominally scheduled for September 2026, due to concerns about hardware readiness and mission complexity.

Under one of the options, astronauts would launch into low-Earth orbit inside an Orion spacecraft and rendezvous there with a Starship vehicle, separately launched by SpaceX. During this mission, similar to Apollo 9, a precursor to the Apollo 11 lunar landing, the crew would validate the ability of Orion and Starship to dock and test habitability inside Starship. The crew would then return to Earth. In another option NASA is considering, a crew would launch in Orion and fly to a small space station near the Moon, the Lunar Gateway, and then return to Earth.

To discuss these options, Ars asked for an interview with Catherine Koerner, a deputy associate administrator who oversees Exploration Systems Development for NASA. Instead, the space agency offered a noncommittal statement.

“NASA continues to work toward the Artemis II crewed test flight in September of 2025 and the Artemis III test flight to land astronauts near the lunar South Pole in September of 2026,” the statement read. “The agency evaluates element progress and status on a daily basis and uses that data to make decisions at the right time for each mission as a part of prudent programmatic and mission management. Should a particular hardware element not be available to support a mission as scheduled or planned, NASA will evaluate the readiness of available hardware for options to make those decisions with crew safety as the number one priority.”

An unrealistic timeline

The space agency’s date for Artemis II is optimistic but potentially feasible if NASA can resolve the Orion spacecraft’s heat shield issues. A lunar landing in September 2026, however, seems completely unrealistic. The biggest stumbling blocks for Artemis III are the lack of a lander, which SpaceX is developing through its Starship program, and spacesuits for forays onto the lunar surface by Axiom Space. It is not clear when the lander or the suits, which NASA only began funding in the last two to three years, will be ready.

There are also concerns about the complexity of Artemis III. It will require a number of previously untested steps, including an Orion-Starship rendezvous and docking in lunar orbit; humans flying inside of Starship in space; Starship going down to the surface and coming back up to dock with Orion; and more. Mission planners would be more comfortable if they could, in NASA parlance, “buy down the risk” of Artemis III by validating some of these delicate maneuvers before the lunar landing mission.

This is why NASA has asked SpaceX to look at a mission where Orion would rendezvous with the Starship vehicle in orbit around Earth. Such a mission—whether called Artemis IIS or Artemis III—would solve a lot of problems for the space agency and appears to be the preferred option at this time. Critically, it would verify the ability of the two spacecraft to dock in an environment where, if there were a problem, it would be much easier for the crew to return safely home. It would also validate the ability of astronauts to live inside Starship and perform some ascent and descent maneuvers.

NASA may alter Artemis III to have Starship and Orion dock in low-Earth orbit Read More »

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Boeing says it will cut SLS workforce “due to external factors”

Science, Space / /

SLS, but smaller —

“Boeing is reviewing and adjusting current staffing levels.”

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The SLS rocket is seen on its launch pad at Kennedy Space Center in August 2022.

Enlarge / The SLS rocket is seen on its launch pad at Kennedy Space Center in August 2022.

Trevor Mahlmann

On Thursday senior Boeing officials leading the Space Launch System program, including David Dutcher and Steve Snell, convened an all-hands meeting for the more than 1,000 employees who work on the rocket.

According to two people familiar with the meeting, the officials announced that there would be a significant number of layoffs and reassignments of people working on the program. They offered a handful of reasons for the cuts, including the fact that timelines for NASA’s Artemis lunar missions that will use the SLS rocket are slipping to the right.

Later on Thursday, in a statement provided to Ars, a Boeing spokesperson confirmed the cuts to Ars: “Due to external factors unrelated to our program performance, Boeing is reviewing and adjusting current staffing levels on the Space Launch System program.”

Better late than never?

For nearly a decade and a half, Boeing has led development of the core stage of the massive SLS rocket that NASA intends to use to launch the Orion spacecraft for its crewed Moon missions.

The contract has been lucrative for Boeing, and subject to considerable criticism over the years for its largesse, as NASA has spent tens of billions of dollars developing a rocket that reuses Space Shuttle main engines and other elements. Also, the rocket was originally supposed to make its debut in late 2016 or 2017, but did not actually fly for the first time until November 2022. And NASA’s Inspector General has characterized Boeing’s management of the SLS rocket program, at times, as “poor.”

However, when the SLS rocket made its debut a year and a half ago, it performed exceptionally well in lofting an uncrewed Orion spacecraft toward the Moon. After that mission NASA declared the rocket to be “operational,” and Boeing moved into production of the vehicle for future missions that will carry astronauts to the Moon.

So in some sense, these cuts were inevitable. Boeing required a lot of resources to design, develop, test, and write software for the rocket. Now that the development phase is over, it is natural that the company would be scaling down development activities for the core stage.

The Boeing statement did not say so, but sources told Ars that the cuts may eventually amount to hundreds of employees. They will be spread across the company’s rocket facilities in Alabama, Louisiana, and Florida, primarily. The cuts will hit both the core stage program as well as the Exploration Upper Stage program, a new upper stage for the rocket that is also beginning to move from development into production.

Waiting on other elements

When Boeing cites “external factors,” it is referring to the slipping timelines for NASA’s Artemis Program. In January officials with the space agency announced approximately one-year delays for both the Artemis II mission, a crewed lunar flyby, to September 2025; and Artemis III, a lunar landing, to September 2026. Neither of these schedules are set in stone, either. Further delays are possible for Artemis II, and likely for Artemis III if NASA sticks to the current mission plans.

Although the SLS rocket will be ready for the current schedule, barring a catastrophe, the other elements are in doubt. For Artemis II, NASA still has not cleared a heat shield issue with the Orion spacecraft. That must be resolved before the mission gets a green light to proceed next year.

The challenges are even greater for Artemis III. For that mission NASA needs to have a lunar lander—which is being provided by SpaceX with its Starship vehicle—in addition to spacesuits for the lunar surface provided by Axiom Space. Both of these elements remain solidly in the development phase.

Additionally, NASA is grappling with budget challenges. For the first time in more than a decade, the agency is facing budget cuts. This week the space agency’s administrator, Bill Nelson, told Congress, “With less money, we have to make some very tough choices.” Among these could be seeking to use future SLS funding to shore up other elements of Artemis.

One of the people familiar with Boeing’s internal meeting on Thursday said the space agency had come to the company earlier this year and said, in effect, that Boeing would receive less funding as SLS development wound down. The company was given the choice to “stretch” the funding it would receive, or pause for a year due to the delays in the Artemis mission. Boeing chose to stretch the funds, and that was a driver of the cuts this week.

It would be easy, but unfair, to blame SpaceX and Axiom for the delays to future Artemis missions. Congress created the SLS rocket with an authorization bill back in 2010, but Boeing actually had been receiving funding for related work dating back to 2007. By contrast, NASA did not start funding work on the Starship lunar lander until late 2021, and the Axiom spacesuits until 2022. In some sense, these developments are as technically demanding as the SLS rocket work, if not more so.

Boeing says it will cut SLS workforce “due to external factors” Read More »

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SpaceX and Northrop are working on a constellation of spy satellites

Northrop Grumman, Science, Space, spacex / /

X marks the spot —

First launch of these operational vehicles may occur next month from California.

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A Falcon 9 rocket launches a Starlink mission in January 2020.

Enlarge / A Falcon 9 rocket launches a Starlink mission in January 2020.

SpaceX

SpaceX is reportedly working with at least one major US defense contractor, Northrop Grumman, on a constellation of spy satellites for the National Reconnaissance Office.

According to Reuters, development of the network of hundreds of spy satellites by SpaceX is being coordinated with multiple contractors to avoid putting too much control of a highly sensitive intelligence program in the hands of one company.

“It is in the government’s interest to not be totally invested in one company run by one person,” one of the news agency’s sources said, most likely referring to SpaceX founder Elon Musk.

Northrop will provide sensors for a subset of the satellites in the constellation—at least 50 of them—and test those spacecraft at its own facility prior to their launch into orbit, Reuters reports.

A proliferated constellation

The news agency first disclosed the existence of SpaceX’s contract with the National Reconnaissance Office, which is responsible for operating US spy satellites, in March. The network is being built by SpaceX’s Starshield business unit under a $1.8 billion contract signed in 2021.

While this network will be separate from SpaceX’s Starlink Internet constellation, the National Reconnaissance Office contract is leveraging SpaceX’s capability to put a large number of Starlink satellites into orbit with its existing manufacturing facilities and the reusable Falcon 9 rocket. The current Starlink megaconstellation has more than 5,700 operational satellites.

This spysat constellation is considered to be “proliferated” because there will be swarms of satellites launched into low-Earth orbit to provide imaging and other capabilities, and these should be less vulnerable to enemy attack because of their large numbers.

Although no nation has ever attacked another nation’s satellites, major space powers, including the United States, Russia, and China, are clearly working on such measures. A good reference for these efforts is the Secure World Foundation’s annual Global Counterspace Capabilities report.

In its reporting, Reuters suggests that the high-quality imaging sensors on the SpaceX satellites in low-Earth orbit will exceed the resolution of some of the best US spy satellites at higher altitudes. They may also provide a superior alternative to the current use of drones and reconnaissance aircraft, which can be risky to fly in the airspace of other nations.

The first elements of this proliferated constellation are likely to launch next month from Vandenberg Space Force Base on the NROL-146 mission. According to Troy Meink, the National Reconnaissance Office’s principal deputy director, this will be the first of as many as six such launches in 2024.

“This launch will be the first launch of an actual operational system,” Meink said at the annual Space Symposium earlier this month. “This system will increase timeliness of access, diversity of communication paths and enhance our resilience.”

An uneasy partnership

Typically, in its 22 years of operation, SpaceX has eschewed deep partnerships with traditional aerospace contractors, including Northrop Grumman. Early on, in fact, SpaceX had a legal confrontation with Northrop over the pintle engine injector technology used in the Merlin rocket engine that powered the Falcon 1, and later Falcon 9 rocket. SpaceX counter-sued, saying Northrop had abused its position in an advisory role in the Air Force to spy on SpaceX. Eventually, the lawsuits were both dropped with no damages.

More than a decade later, SpaceX launched the “Zuma” satellite, an ultra-expensive classified spacecraft valued in excess of $3 billion and built by Northrop for the National Reconnaissance Office. The launch on a Falcon 9 rocket was successful in January 2018, but the spacecraft was subsequently lost. The failure was later blamed on a payload adaptor supplied by Northrop Grumman, although this has never been publicly confirmed.

It is clearly hoped by US government officials that this collaboration between SpaceX and Northrop will meet a happier fate.

SpaceX and Northrop are working on a constellation of spy satellites Read More »

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Rocket Report: Delta IV’s grand finale; Angara flies another dummy payload

rocket report, Science, Space / /
The Angara A5 rocket launched this week from Vostochny for the first time.

Enlarge / The Angara A5 rocket launched this week from Vostochny for the first time.

Roscosmos

Welcome to Edition 6.39 of the Rocket Report! The big news this week came from United Launch Alliance, and the final mission of its Delta IV Heavy rocket. Both Stephen and I had thoughts about this launch, which is bittersweet, and we expressed them in stories linked below. It’s been a little less than 20 years since this big rocket debuted, and interesting to think how very much the launch industry has changed since then.

As always, we welcome reader submissions, and if you don’t want to miss an issue, please subscribe using the box below (the form will not appear on AMP-enabled versions of the site). Each report will include information on small-, medium-, and heavy-lift rockets as well as a quick look ahead at the next three launches on the calendar.

Rocket Lab to reuse flight tank. On Wednesday Rocket Lab said it is returning a previously flown Electron rocket first stage tank to the production line for the first time in preparation for reflying the stage. The company characterized this as a “significant” milestone as it seeks to make Electron the world’s first reusable small rocket. This stage was successfully launched and recovered as part of the ‘Four of a Kind’ mission earlier this year on January 31.

Iterating a path to reuse … The stage will now undergo final fit out and rigorous qualification for reuse. “Our key priority in pushing this stage back into the standard production flow for the first time is to ensure our systems and qualification processes are fit for accepting pre-flown boosters at scale,” said Rocket Lab founder and CEO Peter Beck. “If this stage successfully passes and is accepted for flight, we’ll consider opportunities for reflying it in the new year.” (submitted by Ken the Bin)

Virgin Orbit IP for sale on LinkedIn. In a post this week on the social networking site LinkedIn, former Virgin Orbit chief executive Dan Hart said that the Virgin Orbit IP library is being made available for licensing. “The flight-proven LauncherOne IP can accelerate launch and hypersonic system development schedules by years, and enable significant cost savings,” Hart wrote. “The innovative designs can also offer component/subsystem providers immediate product line expansion.”

Yours for a low, low price … The IP library includes all manner of goodies, including an FAA-approved flight termination system, the Newton 3 and Newton 4 engines, avionics, structures, and more. Price for access to all IP is $3 million for a nonexclusive license, Hart said. I have no idea whether that’s a good price or not.

The easiest way to keep up with Eric Berger’s space reporting is to sign up for his newsletter, we’ll collect his stories in your inbox.

Virgin Galactic countersues Boeing. Virgin Galactic has filed a countersuit against Boeing over a project to develop a new mothership aircraft, arguing in part that Boeing performed poorly, Space News reports. The suit, filed last week in the US District Court for the Central District of California, comes two weeks after Boeing filed suit against Virgin Galactic, alleging that Virgin refused to pay more than $25 million in invoices on the project and misappropriated trade secrets.

Citing Boeing’s own record … The dispute revolves around a project announced in 2022 to develop a new aircraft that would replace Virgin’s existing VMS Eve as an air-launch platform. Virgin, in its suit, claims that Boeing performed “shoddy and incomplete” work on the initial phases of the project. “Boeing’s failures with respect to its agreement with Virgin Galactic are consistent with Boeing’s record of poor quality control and mismanagement,” the complaint states. (submitted by EllPeaTea)

Navy awards contract to Ursa Major. The rocket propulsion startup said Monday it has signed a contract with the United States Navy to develop and test solid fuel rocket engines in an effort to develop a next generation of solid rocket motor for the Navy’s standard missile program, Reuters reports. The agreement is part of a series of prototype engine contracts being awarded by the US Navy as it seeks to expand the industrial base for manufacturing them.

Broadening the US supplier base … The deal comes as the Navy is seeing a surge in missile demand due to the ongoing conflicts in Gaza and Yemen and the war in Ukraine. “Our new approach to manufacturing solid rocket motors allows Ursa Major to quickly develop high-performing motors at scale, driving volume and cost efficiencies to address this critical national need,” said Ursa Major Founder Joe Laurienti. (submitted by Ken the Bin)

Rocket Report: Delta IV’s grand finale; Angara flies another dummy payload Read More »

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SpaceX’s most-flown reusable rocket will go for its 20th launch tonight

b1062, cape canaveral, Commercial space, falcon 9, launch, reusable rocket, Science, Space, spacex, starlink / /
File photo of a Falcon 9 rocket rolling out of its hangar at Cape Canaveral Space Force Station, Florida.

Enlarge / File photo of a Falcon 9 rocket rolling out of its hangar at Cape Canaveral Space Force Station, Florida.

For the first time, SpaceX will launch one of its reusable Falcon 9 boosters for a 20th time Friday night on a flight to deliver 23 more Starlink Internet satellites to orbit.

This milestone mission is scheduled to lift off at 9: 22 pm EDT Friday (01: 22 UTC Saturday) from Space Launch Complex 40 (SLC-40) at Cape Canaveral Space Force Station, Florida. Forecasters from the US Space Force predict “excellent” weather for the primetime launch.

Falcon 9 will blaze a familiar trail into space, following the same profile as dozens of past Starlink missions.

The rocket’s first-stage booster will shut off its nine kerosene-fueled Merlin engines about two-and-a-half minutes into the flight, reaching a top speed of more than 5,000 mph (8,000 km per hour). The first stage will detach from the Falcon 9’s upper stage, which will continue firing into orbit. The 15-story-tall Falcon 9 booster, meanwhile, will follow an arcing trajectory before braking for a vertical landing on a drone ship floating in the Atlantic Ocean near the Bahamas.

The 23 flat-packed Starlink spacecraft will deploy from the upper stage a little more than an hour after liftoff, bringing the total number of Starlinks in low-Earth orbit to more than 5,800 spacecraft.

A hunger for launch

Pretty much every day, SpaceX is either launching a rocket or rolling one out of the hangar to the launch pad. At this pace, SpaceX is redefining what is routine in the space industry, but the rapid-fire launch rate also means the company is continually breaking records, mostly its own.

Friday night’s launch will break another one of those records. This first-stage booster, designated by the tail number B1062, has flown 19 times since its first flight in November 2020. The booster will now be the first in SpaceX’s inventory to go for a 20th flight, breaking a tie with three other rockets as the company’s fleet leader.

When SpaceX debuted the latest version of its Falcon 9 rocket, the Falcon 9 Block 5, officials said the reusable first stage could fly 10 times with minimal refurbishment and perhaps additional flights with a more extensive overhaul. Now, SpaceX is certifying Falcon 9 boosters for 40 flights.

This particular rocket has not undergone any extended maintenance or long-term grounding. It has flown an average of once every two months since debuting three-and-a-half years ago. So the 20-flight milestone SpaceX will achieve Friday night means this rocket has doubled its original design life and, at the same time, has reached the halfway point of its extended service life.

In its career, this booster has launched eight people and 530 spacecraft, mostly Starlinks. The rocket’s first two flights launched GPS navigation satellites for the US military, then it launched two commercial human spaceflight missions with Dragon crew capsules. These were the all-private Inspiration4 mission and Axiom Mission 1, the first fully commercial crew flight to the International Space Station.

A SpaceX Falcon 9 rocket lifts off Sunday, April 7, on the Bandwagon 1 rideshare mission.

Enlarge / A SpaceX Falcon 9 rocket lifts off Sunday, April 7, on the Bandwagon 1 rideshare mission.

Remarkably, this will be the sixth Falcon 9 launch in less than eight days, more flights than SpaceX’s main US rival, United Launch Alliance, has launched in 17 months.

It will be the 38th Falcon 9 launch of the year and the 111th flight of a Falcon 9 or Falcon Heavy rocket—the 114th launch by SpaceX overall—in the last 365 days. More than a third of SpaceX’s Falcon 9 or Falcon Heavy missions, a number that will stand at 332 after Friday night’s flight, have launched in the past year.

This month, for the first time, SpaceX demonstrated it could launch two Falcon 9 rockets in less than five days from the company’s launch pad at Vandenberg Space Force Base, California. SpaceX has also cut the turnaround time between Falcon 9 rockets at Launch Complex 39A at NASA’s Kennedy Space Center. The company’s most-used launch pad, SLC-40, can handle two Falcon 9 flights in less than four days.

It’s not just launch pad turnaround. SpaceX uses its drone ships—two based in Florida and one in California—for most Falcon 9 landings. In order to meet the appetite for Falcon 9 launches, SpaceX is getting rockets back to port and re-deploying drone ships back to sea at a faster rate.

SpaceX’s most-flown reusable rocket will go for its 20th launch tonight Read More »

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The Space Force is planning what could be the first military exercise in orbit

Commercial space, military exercise, military space, rocket lab, Science, Space, space domain awareness, true anomaly, US Space Force, victus haze / /
Artist's illustration of two satellites performing rendezvous and proximity operations in low-Earth orbit.

Enlarge / Artist’s illustration of two satellites performing rendezvous and proximity operations in low-Earth orbit.

The US Space Force announced Thursday it is partnering with two companies, Rocket Lab and True Anomaly, for a first-of-its-kind mission to demonstrate how the military might counter “on-orbit aggression.”

On this mission, a spacecraft built and launched by Rocket Lab will chase down another satellite made by True Anomaly, a Colorado-based startup. “The vendors will exercise a realistic threat response scenario in an on-orbit space domain awareness demonstration called Victus Haze,” the Space Force’s Space Systems Command said in a statement.

This threat scenario could involve a satellite performing maneuvers that approach a US spacecraft or a satellite doing something else unusual or unexpected. In such a scenario, the Space Force wants to have the capability to respond, either to deter an adversary from taking action or to defend a US satellite from an attack.

Going up to take a look

“When another nation puts an asset up into space and we don’t quite know what that asset is, we don’t know what its intent is, we don’t know what its capabilities are, we need the ability to go up there and figure out what this thing is,” said Gen. Michael Guetlein, the Space Force’s vice chief of space operations.

This is what the Space Force wants to demonstrate with Victus Haze. For this mission, True Anomaly’s spacecraft will launch first, posing as a satellite from a potential adversary, like China or Russia. Rocket Lab will have a satellite on standby to go up and inspect True Anomaly’s spacecraft and will launch it when the Space Force gives the launch order.

“Pretty sporty,” said Even Rogers, co-founder and CEO of True Anomaly.

Then, if all goes according to plan, the two spacecraft will switch roles, with True Anomaly’s Jackal satellite actively maneuvering around Rocket Lab’s satellite. According to the Space Force, True Anomaly and Rocket Lab will deliver their spacecraft no later than the fall of 2025.

“If a near-peer competitor makes a movement, we need to have it in our quiver to make a counter maneuver, whether that be go up and do a show of force or go up and do space domain awareness or understand the characterization of the environment—what’s going on?” Guetlein said.

Victus Haze is the next in a series of military missions dedicated to validating Tactically Responsive Space (TacRS) capabilities. With these efforts, the Space Force and its commercial partners have shown how they can compress the time it takes to prepare and launch a satellite.

Last year, the Space Force partnered with Firefly Aerospace and Millennium Space Systems on the Victus Nox mission. The Victus Nox satellite was built and tested in less than a year and then readied for launch in less than 60 hours. Firefly successfully launched the spacecraft on its Alpha rocket 27 hours after receiving launch orders from the Space Force, a remarkable achievement in an industry where satellites take years to build and launch campaigns typically last weeks or months.

One of True Anomaly's first two Jackal

Enlarge / One of True Anomaly’s first two Jackal “autonomous orbital vehicles,” which launched in March on a SpaceX rideshare mission.

“We no longer have the luxury of time to wait years, even 10 or 15 years, to deliver some of these capabilities.” Guetlein said in a discussion in January hosted by the Center for Strategic and International Studies. “A tactically relevant timeline is a matter of weeks, days, or even hours.”

“Victus Haze is about continuing to break those paradigms and to show how we would rapidly put up a space domain awareness capability and operate it in real time against a threat,” Guetlein said.

The Victus Haze mission is more complicated than Victus Nox, involving two prime contractors, two spacecraft, and two rocket launches from different spaceports, all timed to occur with short timelines “to keep the demonstration as realistic as possible,” a Space Force spokesperson told Ars.

“This demonstration will ultimately prepare the United States Space Force to provide future forces to combatant commands to conduct rapid operations in response to adversary on-orbit aggression,” Space Systems Command said in a statement.

The Space Force is planning what could be the first military exercise in orbit Read More »

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After a fiery finale, the Delta rocket family now belongs to history

delta iv, delta iv heavy, launch, military space, National Reconnaissance Office, nrol-70, Science, Space, united launch alliance / /

Delta 389 —

“It is bittersweet to see the last one, but there are great things ahead.”

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In this video frame from ULA's live broadcast, three RS-68A engines power the Delta IV Heavy rocket into the sky over Cape Canaveral, Florida.

Enlarge / In this video frame from ULA’s live broadcast, three RS-68A engines power the Delta IV Heavy rocket into the sky over Cape Canaveral, Florida.

United Launch Alliance

The final flight of United Launch Alliance’s Delta IV Heavy rocket took off Tuesday from Cape Canaveral, Florida, with a classified spy satellite for the National Reconnaissance Office.

The Delta IV Heavy, one of the world’s most powerful rockets, launched for the 16th and final time Tuesday. It was the 45th and last flight of a Delta IV launcher and the final rocket named Delta to ever launch, ending a string of 389 missions dating back to 1960.

United Launch Alliance (ULA) tried to launch this rocket on March 28 but aborted the countdown about four minutes prior to liftoff due to trouble with nitrogen pumps at an off-site facility at Cape Canaveral. The nitrogen is necessary for purging parts inside the Delta IV rocket before launch, reducing the risk of a fire or explosion during the countdown.

The pumps, operated by Air Liquide, are part of a network that distributes nitrogen to different launch pads at the Florida spaceport. The nitrogen network has caused problems before, most notably during the first launch campaign for NASA’s Space Launch System rocket in 2022. Air Liquide did not respond to questions from Ars.

A flawless liftoff

With a solution in place, ULA gave the go-ahead for another launch attempt Tuesday. After a smooth countdown, the final Delta IV Heavy lifted off from Cape Canaveral Space Force Station at 12: 53 pm EDT (16: 53 UTC).

Three hydrogen-fueled RS-68A engines made by Aerojet Rocketdyne flashed to life in the final seconds before launch and throttled up to produce more than 2 million pounds of thrust. The ignition sequence was accompanied by a dramatic hydrogen fireball, a hallmark of Delta IV Heavy launches, that singed the bottom of the 235-foot-tall (71.6-meter) rocket, turning a patch of its orange insulation black. Then, 12 hold-down bolts fired and freed the Delta IV Heavy for its climb into space with a top-secret payload for the US government’s spy satellite agency.

Heading east from Florida’s Space Coast, the Delta IV Heavy appeared to perform well in the early phases of its mission. After fading from view from ground-based cameras, the rocket’s two liquid-fueled side boosters jettisoned around four minutes into the flight, a moment captured by onboard video cameras. The core stage engine increased power to fire for a couple more minutes. Nearly six minutes after liftoff, the core stage was released, and the Delta IV upper stage took over for a series of burns with its RL10 engine.

At that point, ULA cut the public video and audio feeds from the launch control center, and the mission flew into a news blackout. The final portions of rocket launches carrying National Reconnaissance Office (NRO) satellites are usually performed in secret.

In all likelihood, the Delta IV Heavy’s upper stage was expected to fire its engine at least three times to place the classified NRO satellite into a circular geostationary orbit more than 22,000 miles (nearly 36,000 kilometers) over the equator. In this orbit, the spacecraft will move in lock-step with the planet’s rotation, giving the NRO’s newest spy satellite constant coverage over a portion of the Earth.

It will take about six hours for the rocket’s upper stage to deploy its payload into this high-altitude orbit and only then will ULA and the NRO declare the launch a success.

Eavesdropping from space

While the payload is classified, experts can glean a few insights from the circumstances of its launch. Only the largest NRO spy satellites require a launch on a Delta IV Heavy, and the payload on this mission is “almost certainly” a type of satellite known publicly as an “Advanced Orion” or “Mentor” spacecraft, according to Marco Langbroek, an expert Dutch satellite tracker.

The Advanced Orion satellites require the combination of the Delta IV Heavy rocket’s lift capability, long-duration upper stage, and huge, 65-foot-long (19.8-meter) trisector payload fairing, the largest payload enclosure of any operational rocket. In 2010, Bruce Carlson, then-director of the NRO, referred to the Advanced Orion platform as the “largest satellite in the world.”

When viewed from Earth, these satellites shine with the brightness of an eighth-magnitude star, making them easily visible with small binoculars despite their distant orbits, according to Ted Molczan, a skywatcher who tracks satellite activity.

“The satellites feature a very large parabolic unfoldable mesh antenna, with estimates of the size of this antenna ranging from 20 to 100 (!) meters,” Langbroek writes on his website, citing information leaked by Edward Snowden.

The purpose of these Advanced Orion satellites, each with mesh antennas that unfurl to a diameter of up to 330 feet (100 meters), is to listen in on communications and radio transmissions from US adversaries, and perhaps allies. Six previous Delta IV Heavy missions also likely launched Advanced Orion or Mentor satellites, giving the NRO a global web of listening posts parked high above the planet.

With the last Delta IV Heavy off the launch pad, ULA has achieved a goal of its corporate strategy sent into motion a decade ago, when the company decided to retire the Delta IV and Atlas V rockets in favor of a new-generation rocket named Vulcan. The first Vulcan rocket successfully launched in January, so the last few months have been a time of transition for ULA, a 50-50 joint venture owned by Boeing and Lockheed Martin.

“This is such an amazing piece of technology: 23 stories tall, half a million gallons of propellant, two and a quarter million pounds of thrust, and the most metal of all rockets, setting itself on fire before it goes to space,” Bruno said of the Delta IV Heavy before its final launch. “Retiring it is (key to) the future, moving to Vulcan, a less expensive, higher-performance rocket. But it’s still sad.”

“Everything that Delta has done … is being done better on Vulcan, so this is a great evolutionary step,” said Bill Cullen, ULA’s launch systems director. “It is bittersweet to see the last one, but there are great things ahead.”

After a fiery finale, the Delta rocket family now belongs to history Read More »