Tag: spaceflight

Starliner return delayed until after ground thruster tests are completed and analyzed

9:15 am

Starliner docked to ISS
Starliner docked during the unmanned demo
flight in May 2022

According the NASA and Boeing officials yesterday, they are in the process of doing ground thruster tests to emulate the problems that occurred on the thrusters during docking procedures to ISS in early June, and will not decide on a return date for Starliner until after those tests are completed and analyzed, expected sometime in the next two weeks.

It appears some of the ground tests were delayed slightly due to the arrival of Hurricane Beryl in Texas.

It is very important to note that the astronauts are not “stranded” on the station, as a lot of news organizations are still claiming. The thrusters on Starliner that failed are part of the service module, which will not return to Earth when the astronauts come home on the the capsule. They therefore want to do as much research as possible beforehand in order to determine the cause of the failures in order to prevent them on future capsule flights. For example, the ground tests are first attempting to duplicate precisely what happened during docking, and will then do tests attempting to duplicate what will happen during de-orbit.

In the meantime, they appear to have no doubt that they can use Starliner for return, no matter what. At the moment only one thruster appears out-of-commission, and none of the thrusters that failed during docking are used for the de-orbit burn. They are only used for orientation, and the capsule has ample redundancy for this function sufficient for de-orbit.

In addition, it is a good thing for them to extend Starliner’s total flight time. I suspect even if everything had worked as planned they would have extended this mission as they have. This allows them to prove out the in-space operation of the capsule and service module. So far it appears that operation has been excellent, which is one reason they are willing to delay the return to do the ground tests.

Overall, my impression is that the situation is entirely under control, and in fact NASA is reasonably satisfied with the capsule’s operation in general. It appears that the agency will likely have no problem in flying future manned missions with Starliner, though it will want the thruster issue solved beforehand.

As for Boeing, these problems have stained its reputation further, and have likely made it much more difficult to sell future capsule flights to other customers. I would say however that after listening to the last few press briefings it seems to me that Boeing’s manned space division is now doing the proper due diligence it should have done before. For example, the thruster problems appear to be related to overheating during use, which is a very fixable issue.

These facts actually makes me more confident in the capsule, and future potential customers should do the same review themselves.

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Reanalysis of Apollo seismic data finds 22,000 previously undetected quakes

2:50 pm

By taking a new look at the data from the seismometers placed on the lunar surface by the Apollo missions during the 1970s, Keisuke Onodera of the University of Tokyo was able to find approximately 22,000 previously undetected quakes, almost tripling the rate of seismic activity on the Moon. From the paper’s abstract:

In the 1970s, two types of seismometers were installed on the nearside of the Moon. One type is called the Long-Period (LP) seismometer, which is sensitive below 1.5 Hz. The other is called the Short-Period (SP) seismometer, whose sensitivity is high around 2–10 Hz. So far, more than 13,000 seismic events have been identified through analyzing the LP data, which allowed us to investigate lunar seismicity and its internal structure.

On the other hand, most of the SP data have remained unanalyzed because they include numerous artifacts. This fact leads to the hypotheses that (a) we have missed lots of high-frequency seismic events and (b) lunar seismicity could be underestimated.

To verify these ideas, I conducted an analysis of the SP data. … I discovered 22,000 new seismic events, including thermal moonquakes, impact-induced events, and shallow moonquakes. Among these, I focused on analyzing shallow moonquakes—tectonic-related quakes. Consequently, it turned out that there were 2.6 times more tectonic events than considered before. Furthermore, additional detections of shallow moonquakes enabled me to see the regionality in seismicity. Comparing three landing sites (Apollo 14, 15, and 16), I found that the Apollo 15 site was more seismically active than others. These findings can change the conventional views of lunar seismicity.

The data also suggests the northern hemisphere is more active than the southern.

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Astronomers: A black hole weighing 8,200 solar masses likely sits at the center of the Milky Ways’ largest globular cluster

2:39 pm

Omega Centauri
Click for original image.

By analyzing the motion of seven fast moving stars at the center of the globular cluster Omega Centauri, the largest such cluster in the Milky Way and located about 18,000 light years away, astronomers now think they have detected evidence of an intermediate-sized black hole weight at least 8,200 solar masses.

You can read the published paper here. [pdf] The picture of Omega Centauri to the right, reduced and sharpened to post here, was created from more than 500 images taken over two decades by the Hubble Space Telescope. The inset, figure 1b of the paper, shows those seven fast-moving stars in pink, each having an arrow indicating the distance they are expected to move in a 100 years. The dashed circle marks the region where the black hole is believed to reside, with the dark blue cross in its upper left quadrant the most likely position of the black hole based on calculations.

From the caption for the larger Omega Centauri Hubble image:

Omega Centauri is visible from Earth with the naked eye and is one of the favourite celestial objects for stargazers in the southern hemisphere. Although the cluster is 17 700 light-years away, lying just above the plane of the Milky Way, it appears almost as large as the full Moon when seen from a dark rural area.

Though such intermediate-sized black holes have been theorized as existing inside globular clusters, I think this is the first real evidence of one.

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Radar movie produced of 500-foot-wide asteroid

9:44 am

Movie of asteroid

Cool image time! Astronomers have created a movie of radar images of a 500-foot-wide asteroid, dubbed 2024 MK, as it flew past the Earth on June 30, 2024 only 184,000 miles away, using two different radar dishes that are part of NASA’s Deep Space Network normally used for communications with planetary missions.

That movie is to the right.

The Deep Space Network’s 230-foot (70-meter) Goldstone Solar System Radar, called Deep Space Station 14 (or DSS-14), was used to transmit radio frequency signals to the asteroid, and the 114-foot (34-meter) DSS-13 received the reflected signals. The result of this “bistatic” radar observation is a detailed image of the asteroid’s surface, revealing concavities, ridges, and boulders about 30 feet (10 meters) wide.

This is not the first time an asteroid has been observed in this manner using radar, but it illustrates how the technique is becoming increasingly sophisticated, capable of producing images of surprising resolution.

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Japanese company proposes building a module to add to Axiom’s space station

9:24 am

Axiom's space station assembly sequence
The assembly sequence for Axiom’s space station while attached to ISS.
Click for original image.

The Japanese company Mitsui has now proposed building a module — based on Japan’s HTV cargo freighter that did several missions to ISS — and sell it to the commercial space stations now under construction.

Mitsui has created a subsidiary called LEO Shachu to develop the module. What makes this project very likely to happen is that Mitsui is also an investor in Axiom’s space station, and according to the article at the link, a Axiom official who is also a retired Japanese astronaut who flew to ISS has expressed interest in it.

This story also helps outline the international landscape of the future stations. While Voyager Space’s Starlab station has been partnering extensively with Europe and Airbus, Axiom appears to be partnering more closely with NASA and Japan. The third station that has obtained NASA money, Blue Origin’s Orbit Reef, had made an earlier deal with Mitsubishi, but appears to have obtained few other outside partners, and that Mitsubishi deal only involved “development work,” not specific hardware. Moreover, Mitsubishi later made a new deal with the Starlab station, suggesting it had broken up with Blue Origin.

A fourth station, being built by the private company Vast with no NASA money, has partnered with SpaceX and ESA. It is also likely to be the first to launch its first module in August 2025, followed soon thereafter by a 30 day 4-person Dragon mission.

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Astroscale’s ADRAS-J test spacecraft continues successfully maneuvers around abandoned rocket upper stage

9:04 am

abandoned upper stage, taken by ADRAS-J
Click for original image.

The Japaneses orbital tug startup Astroscale has revealed that its ADRAS-J test spacecraft has successfully completed more complicated autonomous proximity maneuvers around an abandoned H2A rocket upper stage that it rendezvoused with in March 2024.

Astroscale announced July 9 that its Active Debris Removal by Astroscale-Japan (ADRAS-J) spacecraft conducted a “fly around” maneuver, going part way around the H-2A upper stage it has been inspecting for the last few months. ADRAS-J used sensors to maintain a distance of just 50 meters from the stage.

However, about one third of the way through the maneuver, ADRAS-J encountered what the company called an “unexpected attitude anomaly” that triggered an automatic abort. The spacecraft moved away from the stage as designed to avoid any risk of a collision. “The abort maneuver implemented during the fly-around operation demonstrated that ADRAS-J can maintain safety even while performing close approach observations of non-cooperative objects,” the company said in a statement, adding that engineers had found the cause of the anomaly and were preparing for another close approach to the stage.

The picture to the right is of that upper stage, taken shortly after ADRAS-J arrived near the stage in the spring. According to the company, the stage is in remarkably good condition despite fifteen years in orbit, and also is flying in a very stable manner, tumbling almost not at all. This data suggests a mission to grab it and de-orbit it safely would be relatively easy.

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Webb: An exoplanet in the habitable zone with a possible nitrogen/CO2 atmosphere and water ocean

8:51 am

Using the Webb Space Telescope, astronomers have obtained new transiting spectroscopy of a “mini-Neptune-sized” exoplanet that circles in the habitable zone a red dwarf star about 48 light years away and have concluded that it appears to have a nitrogen/carbon dioxide atmosphere and even a water ocean.

While it is still only a tentative result, the presence of a nitrogen-rich atmosphere on LHS 1140 b would suggest the planet has retained a substantial atmosphere, creating conditions that might support liquid water. This discovery favors the water-world/snowball scenario as the most plausible.

Current models indicate that if LHS 1140 b has an Earth-like atmosphere, it would be a snowball planet with a vast “bull’s-eye” ocean measuring about 4,000 kilometers in diameter, equivalent to half the surface area of the Atlantic Ocean. The surface temperature at the centre of this alien ocean could even be a comfortable 20 degrees Celsius [68 degrees Fahrenheit]. [emphasis mine]

You can read the preprint of the paper here [pdf].

The highlighted phrase must be noted. These results contain a lot of uncertainties and assumptions. However, the data is tantalizing, to say the least, and justify more observations using Webb. The scientists argue in their paper that because there are only about eight transits of the exoplanet per year — requiring several years of observations to pin down this data more precisely — and because Webb has a limited life expectancy as an infrared observatory, this star should get observational priority.

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Europe at last launches Ariane-6

12:47 pm

Ariane-6 seconds after liftoff
Ariane-6 seconds after liftoff

Arianespace, the commercial rocket arm of the European Space Agency (ESA) today successfully completed the first launch of its new Ariane-6 rocket, lifting off from French Guiana in South America carrying nine cubesats plus two re-entry test capsules.

As of posting, the nine cubesats have been deployed. Of the remaining payloads, one is a smallscale version of the return cargo capsule being built by the French company The Exploration Company. It will test the re-entry technology for that capsule.

UPDATE: There was an issue restarting the upper stage later in the flight that prevented the last payloads from being released. The bigwigs at the press conference at this link repeatedly insisted the flight was a complete success, but this failure of the upper stage is not a good thing, but hardly a disaster. It is similar to problems Firefly had on some of its early flights, which the company was able to overcome.

If all goes as planned, Arianespace and Arianegroup (the private company that builds and owns the rocket) hope to ramp up launches over the next three years, doing one more in 2024, six in 2025, eight in 2026, and ten in 2027. It says the rocket has contracts for thirty launches, eighteen of which are for launching Amazon’s Kuiper internet constellation.

I expect Ariane-6 to face heavy competitive pressure over that time period, not only from SpaceX but from the new European rocket startups that should begin launching at far less cost. The pressure should make the future of Ariane-6 somewhat dim, unless the European Union steps in and mandates its use by European satellite companies. If the latter happens, expect Europe’s entire space industry to suffer badly.

This was Europe’s first launch in 2024, so the leader board in the 2024 launch race has not changed:

71 SpaceX
30 China
8 Russia
8 Rocket Lab

American private enterprise still leads the world combined in successful launches, 83 to 46, while SpaceX by itself still leads the entire world, including other American companies, 71 to 58.

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A jumble of blocks in the middle of a Martian flood lava plain

11:25 am

A jumble of blocks on Mars
Click for original image.

Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken on March 18, 2024 by the high resolution camera on Mars Reconnaissance Orbiter (MRO).

This is one of what I like to call “What the heck?” images. The broken up blocks resemble ice floes on the edge of the Arctic ice cap that have broken off and have begun floating away.

The problem with this theory is many fold. First, this is on Mars and not on Earth. Second the “sea” these blocks are supposedly “floating” in is actual solid lava. There is no water or ice here, on the surface or even underground. This is in the dry tropics of Mars, where little or no near-surface ice has so far been detected.

The overview map below provides some context, and possibly an explanation.
» Read more

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Japan dithers about capitalism in space

9:38 am

Despite its government creating in November 2023 a new “Space Strategic Fund” worth more than $6 billion designed to encourage capitalism in space and handing it to Japan’s space agency JAXA to administer, JAXA officials continue to dither on how to use that money to encourage private enterprise in space.

Japan’s space agency is seeking industry proposals for technologies that could contribute to future commercial space stations as the government studies what role it would play in supporting efforts to replace the International Space Station.

…That work will inform plans by Japan on how it can participate in commercial space stations being developed by American companies in partnership with NASA. “We are discussing how we will join NASA’s Commercial LEO Destination program,” said [Yasuo Ishii, senior vice president of JAXA]. “Our responsibility is not clear yet, but, of course, commitment at the government level is essential to commercial operations.” [emphasis mine]

The highlighted phrases above reveal the underlying motives of JAXA, which is not to encourage private independent space companies and reduce its involvement. Just the opposite. And it appears Japan’s government is a partner in this. While Japan gave that money to its space agency, which seems to be searching for ways to hold onto its power, both Europe and India instead quickly took power and funding away from their government agencies (Arianespace and ISRO respectively) to encourage independent private space companies to flourish.

This dithering will only put Japan further behind these countries as well as China, a reality that has become increasingly embarassing for the island nation.

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Webb: Hot Jupiter exoplanet has atmosphere with the smell of rotten eggs

9:20 am

Using spectroscopy from the infrared Webb Space Telescope, astronomers have measured some of the molecules in exoplanet HD 189733 b, one of the first hot Jupiter exoplanets ever discovered, and found it has an atmosphere rich in hydrogen sulfide, which emits a smell like rotten eggs.

In addition to detecting hydrogen sulfide, the team analyzed the planet’s oxygen and carbon content, pinpointing water, carbon dioxide and carbon monoxide as major components of the planetary atmosphere. Measuring these heavy elements allows astronomers to compare the composition of exoplanets to that of gas giants in our solar system like Jupiter and Uranus.

The exoplanet, about 64 light years away, has an orbit lasting only about two Earth days, with atmospheric temperatures has hot as 1,700 degrees Fahrenheit.

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Watch the first launch of Europe’s Ariane-6 rocket

9:14 am

Europe’s Ariane-6 rocket, first proposed in 2014 and about four years behind schedule, will finally make its first launch at 2 pm (Eastern) today.

I have embedded the live stream below.

The rocket was conceived by the European Space Agency (ESA) as an attempt to compete with SpaceX’s Falcon 9 rocket. It failed to do this from day one, since the rocket was from day one designed to be expendable. By the 2020s it became clear to European satellite companies and government agencies that its launch cost would be far higher that the Falcon 9, and these companies and agencies have therefore resisted signing launch contracts with ArianeGroup. In fact, if Amazon had not decided in ’22 to give the Ariane-6 a contract for 18 launches to put up its Kuiper satellites, the rocket would have almost no launches in its manifest.

This situation was made even more starkly evident at the end of June, when the European governent weather company Eumetsat cancelled its Ariane-6 contract and switched to the Falcon 9.

Though the unelected bureaucrats and apparatchiks in the European Union are trying to require the use of Ariane-6, ESA and Europe’s rocket future resides in the independent rocket startups (Rocket Factory Augsburg, Isar Aerospace, Hyimpulse, PLD). Because they are in competition with each other as well as SpaceX, and are not saddled with heavy government interference, they can focus on innovating to lower cost. Expect them to quickly begin launching in the next three years, with reusability soon to follow.

» Read more

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