Tag: engineering

Martian dunes with frost and a sublimating dry ice mantle

2:21 pm

Martian dunes surrounded by frost
Click for original image.

Cool image time! The picture to the right, cropped to post here, was taken on March 16, 2024 by the high resolution camera of Mars Reconnaissance Orbiter (MRO). It was released today as a captioned picture from MRO’s camera team. As noted in the caption, written by the camera’s principal investigator Alfred McEwen:

This image shows a field a sand dunes in the Martian springtime while the seasonal carbon dioxide frost is sublimating into the air. This sublimation process is not at all uniform, instead creating a pattern of dark spots.

In addition, the inter-dune areas are also striking, with bright frost persisting in the troughs of polygons. Our enhanced-color cutout is centered on a brownish-colored inter-dune area.

Each winter the carbon dioxide in the Martian atmosphere falls as snow, mantling the surface in the latitudes above 60 degrees with a clear coat of dry ice. When spring arrives the sunlight passes through the mantle to heat the ground below, which in turn causes the base of the dry ice mantle to sublimate into gas. When the pressure builds enough, the gas breaks through the mantle at its weak points, spewing out and bringing with it dust from below, which stains the mantle with the dark spots.
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Scientists: computer modeling suggests one lunar crater is the origin of a nearby asteroid

11:02 am

The uncertainty of science: Using computer modeling some scientists now suggest that the nearby asteroid 2016 HO3, also known as Kamo’oalewa, that has a solar orbit that periodically flips around the Earth, came from an impact a million years ago that created the Giordano Bruno crater on the moon’s far side.

According to the simulations, it would have required an impactor of at least 1 kilometer (0.6 mile) in diameter to launch a large fragment like Kamo’oalewa beyond the moon’s gravitational pull. According to the group’s model, the impact would have dug up Kamo’oalewa from deep beneath the moon’s surface, leaving behind an impact crater larger than 10 to 20 kilometers (6-12 miles) in diameter. Additionally, the crater would have to be younger than the average lifetime for near-Earth objects, which spans about 10 million to 100 million years, a very short and recent period in the history of the solar system.

While the lunar surface is riddled with thousands of craters from impacts spanning the moon’s 4.5 billion year-history, only Giordano Bruno with its 14-mile diameter and estimated 4 million years of age fits the bill in terms of size and age, making it the most probable source of Kamo’oalewa’s origin. The team also showed that this scenario is feasible from an impact dynamics perspective.

To say that this conclusion is uncertain is an understatement of monumental proportions. However, the possibility is real. A Chinese asteroid mission, dubbed Tianwen-2, will likely found out, as it is planning to bring samples back from this asteroid by 2027.

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France’s space agency puts out calls for rocket companies to lease the French Guiana launchpad formerly used by Russia’s Soyuz rocket

10:51 am

Capitalism in space: France’s space agency CNES has now issued a request for commercial rocket companies to bid on leasing the launchpad formerly used by Russia to launch its Soyuz rocket from French Guiana.

The launchpad became available after the European Space Agency (ESA) broke off its partnerships with Russia in February 2022.

Following the cessation of Soyuz launches, it was agreed that ESA would transfer ownership of the site back to CNES under the provision that it would host two new launch systems. The first will be selected by CNES as part of its recently published call. The second will be selected by ESA as part of the agency’s launcher challenge, which was publically announced in late 2023.

According to the CNES call, prospective candidate vehicles will be required to be capable of deploying payloads of at least 1.5 tonnes into low Earth orbit. Additionally, a maiden flight from the launch site will need to be completed no later than 2027. This will drastically limit the potential bidders.

The article at the link lists three potential bidders, Rocket Factory Augsburg, Maiaspace, and Avio. The first two are rocket startups, having not yet launched a rocket. Avio is the lead contractor for Arianespace’s Vega family of rockets, so it already has experience with an operational rocket, though that rocket is presently grounded due to recent launch failures.

There are a number of other rocket startups in Europe, including PLD in Spain and Hyimpulse and Isar in Germany. The incentive to bid for this launchpad might encourage them to upgrade their rocket to meet the bidding requirements.

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Astroscale releases image of abandoned upper stage taken by its ADRAS-J orbital tug during rendezvous operations

10:37 am

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

Capitalism in space: The Japanese orbital tug startup Astroscale today released an image its ADRAS-J spacecraft took of an abandoned rocket upper stage during rendezvous operations.

That image is to the right, cropped to post here. ADRAS-J’s mission is to test autonomous rendezvous and close proximity operations as well as obtain images of the stage in order to prepare for a second mission that will grab the abandoned stage with a robot arm and de-orbit it.

Both missions have been funded by Japan’s space agency JAXA. The mission however is unprecedented by that agency, in that it did not design the mission, but instead hired this private startup to do it, signaling that agency’s shift from being the designer, builder, and owner of such projects to becoming simply a customer. If successful, the mission will be the first to capture a very large piece of space junk and remove from orbit.

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NASA: first launch of New Glenn is targeting a September 29, 2024 launch date

10:23 am

According to a presentation given by a NASA official at a conference in London yesterday, the first launch of Blue Origin’s New Glenn rocket is now targeting a September 29, 2024 launch.

In a presentation at a meeting of a planetary protection committee of the Committee on Space Research (COSPAR) in London April 24, Nick Benardini, NASA’s planetary protection officer, listed a Sept. 29 date for the launch of Escape and Plasma Acceleration and Dynamics Explorers (ESCAPADE) mission, a pair of smallsats that will go into orbit around Mars to measure the interaction of the planet’s magnetosphere with the solar wind.

NASA selected Blue Origin’s New Glenn rocket to launch ESCAPADE, awarding the company a $20 million task order through the agency’s Venture-Class Acquisition of Dedicated and Rideshare contract in February 2023 for the mission. The award at the time mentioned only a late 2024 launch, with the expectation that ESCAPADE would be on one of the first, if not the first, flight of the rocket.

Benardini mentioned ESCAPADE in his COSPAR presentation to discuss how the mission was complying with planetary protection requirements, intended to prevent any contamination of Mars, during the assembly of the spacecraft and launch preparations at Cape Canaveral. “They’re slated to be launching Sept. 29 with Blue Origin,” he said.

This is the first time any source at NASA or Blue Origin has revealed a specific launch date. The rocket was originally supposed to fly its first orbital test flight four years ago, but numerous delays, mostly related to the BE-4 engine used by the rocket’s first stage as well as decisions by the company’s former CEO, Bob Smith, to slow all development, pushed that launch back repeatedly. With Smith leaving late last year, the company has suddenly come back to life, with many indications that it was pushing for a launch this year.

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Hubble in safe mode

10:15 am

Barred galaxy
Click for original image.

The Hubble Space Telescope has gone into safe mode, pausing science observations on April 23, 2024 when its computer detected problems with one of its three working gyroscopes.

This particular gyro caused Hubble to enter safe mode in November after returning similar faulty readings. The team is currently working to identify potential solutions. If necessary, the spacecraft can be re-configured to operate with only one gyro, with the other remaining gyro placed in reserve . The spacecraft had six new gyros installed during the fifth and final space shuttle servicing mission in 2009. To date, three of those gyros remain operational, including the gyro currently experiencing fluctuations. Hubble uses three gyros to maximize efficiency, but could continue to make science observations with only one gyro if required.

If they cannot recover that gyro and are forced to resume science operations in one-gyro mode, it will mean the end of sharp images such as the one to the right, released today of the barred galaxy NGC 2217, located about 65 million light years away. Three gyros stablize the telescope in all three dimensions. One gyro can stablize it, but not in all three dimensions. Sharpness will suffer. We will no longer have a fully capable general purpose optical telescope in orbit, no plans in the U.S. to replace it.

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China launches three astronauts to its space station

4:23 pm

Earlier today China successfully launched a three-person crew to its Tiangong-3 space station, its Long March 2F rocket lifting off from its Jiuquan spaceport in the northwest of China.

No word on where the four strap-on boosters, the payload fairing, the core stages, and the upper stage crashed inside China, using very toxic hypergolic fuels. This new crew will replace the present crew, who are completing a six-month tour. The new crew will complete a similar-length mission.

The leaders in the 2024 launch race:

42 SpaceX
17 China
6 Russia
5 Rocket Lab

American private enterprise still leads the rest of the world combined in successful launches 49 to 29, while SpaceX by itself still leads the rest of the world, including other American companies, 42 to 36.

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Numerous layers in the interior slopes of Argyre Basin on Mars

12:28 pm

Numerous layers on Mars
Click for original image.

The cool image to the right, cropped, reduced, and enhanced to post here, was taken on February 22, 2024 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It gives us another example the many-layered geological history of Mars, seen in numerous locations across the entire Martian surface.

This example shows many thin layers, going downhill about 450 feet from the mesa near the bottom of the picture to the low point near the picture’s top. At this resolution there appear to be roughly two dozen prominent layers in that descent, but a closer look suggests many more layers within those large layers. Like the terrain that Curiosity is traversing on Mount Sharp, the closer one gets the more layers one sees. And each layer signifies a different geological event, possibly even marking the annual seasons, each either adding or removing a layer of dust or ice, or placing down a new layer of lava.
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China reveals its rough plans for building its manned moon base.

9:35 am

At a conference in China this week, the chief designer of China’s lunar exploration program, Wu Weiren, outlined roughly the plans for building China’s International Lunar Research Station (ILRS) on the Moon.

According to Wu, the first phase of the ILRS construction project will see a basic station built by 2035 in the lunar south pole region. This basic station will have comprehensive scientific facilities with complete basic functions and supporting elements to carry out regular scientific experiments, and develop and utilize resources on a limited scale.

The second phase will see expansion of the station, set for completion by 2045, with a moon-orbiting space station as the hub and facilities featuring complete functions, considerable scale and stable operation. It will carry out comprehensive lunar-based scientific research and resource development and utilization, and conduct technical verification as well as scientific experiments and research for a manned landing on Mars.

This schedule contradicts other recent government statements that suggested the first phrase would be completed by 2030. Either way, we now have a rough timeline which, based on China’s past announcements, should be a reasonably accurate measure of what it now plans to do.

The timeline however is very long, and many other events outside of this program, such as war with Taiwan or sudden changes in the leadership of the ruling communist party, could change it drastically.

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UK’s CAA gives Saxavord on Shetland Islands its range license

9:15 am

Proposed spaceports surrounding Norwegian Sea
Proposed spaceports surrounding Norwegian Sea.

The Civil Aviation Authority (CAA) has now issued the range license for the Saxavord spaceport on the Shetland Islands, following up issuing it a spaceport license in December.

A range licence is a legal requirement ahead of a space launch, but is not in itself permission to launch. This licence grants the broad approval to provide ‘range control services.’ Specifics will depend on the launch vehicle and will be outlined as part of relevant launch licences.

Work by the Civil Aviation Authority continues in assessing potential launch operators from SaxaVord.

Sounds good, eh? Not so fast. It took the CAA about two years to issue these two spaceport licenses, but that doesn’t give anyone the right to launch from Saxavord. The CAA must still issue launch licenses to the specific rocket companies wishing to launch. Though the German rocket startup Rocket Factory Augsburg wants to do the first orbital test flight this year from Saxavord, it still must get that launch license. Do not be surprised if it takes the CAA more than a year to issue it.

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China releases new geological atlas of the Moon

9:03 am

China's geologic map of the Moon

The map above is one low resolution example of a new detailed geological atlas that Chinese scientists have created and just released, using data obtained from all of China’s recent lunar missions, both orbiters and landers.

More information here.

The Chinese Academy of Sciences (CAS) has released the highest-resolution geological maps of the Moon yet. The Geologic Atlas of the Lunar Globe, which took more than 100 researchers over a decade to compile, reveals a total of 12,341 craters, 81 basins and 17 rock types, along with other basic geological information about the lunar surface. The maps were made at the unprecedented scale of 1:2,500,000.

…The CAS also released a book called Map Quadrangles of the Geologic Atlas of the Moon, comprising 30 sector diagrams which together form a visualization of the whole Moon.

The map has been released in both Chinese and English.

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First and second stages of first Ariane-6 rocket are now assembled and on the launchpad

8:48 am

Having integrated together the core first stage and the upper stage of the first Ariane-6 rocket, engineers have now lifted both vertical on the launch pad in preparation for its launch sometime in June or July.

Next two strap-on boosters will be attached to the core stage, as well as the payloads made up of eighteen different smallsats and experiments, including two test re-entry capsules testing their ability to bring payloads safely back to Earth.

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