Tag: engineering

InSight seismometer data suggests no underground ice at landing site

9:25 am

Using a computer model combined with seismometer data gathered by the Mars lander InSight, scientists have concluded that there is little or no underground ice in the equatorial region where InSight sits.

From the paper’s abstract:

We use rock physics models to infer cement properties from seismic velocities. Model results confirm that the upper 300 m of Mars beneath InSight is most likely composed of sediments and fractured basalts. Grains within sediment layers are unlikely to be cemented by ice or other mineral cements. Hence, any existing cements are nodular or formed away from grain contacts. Fractures within the basalt layers could be filled with gas, 2% mineral cement and 98% gas, and no more than 20% ice. Thus, no ice- or liquid water-saturated layers likely exist within the upper 300 m beneath InSight. Any past cement at grain contacts has likely been broken by impacts or marsquakes.

As the lander sits just north of the equator in the red planet’s equatorial zone, which ample orbital data has suggested is a dry region (as shown in the global map below), this result is not a surprise. It does provide further confirmation however of this conclusion, that if there is any water on Mars within 30 degrees latitude of the equator, it will be deep underground, and likely only in certain regions.
» Read more

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Another and this time longer static fire tests for Superheavy prototype #7

9:02 am

Capitalism in space: SpaceX engineers yesterday conducted a second static fire engine test of the 7th prototype of its Superheavy first stage booster, firing a different engine for 20 seconds.

The action ramped up on Thursday (Aug. 11) for Booster 7, which conducted a much longer static fire on Starbase’s orbital launch mount. The burn, which occurred at 3:48 p.m. EDT (1948 GMT), lasted for 20 seconds, SpaceX said via Twitter (opens in new tab).

The long-duration burn aimed to “test autogenous pressurization,” according to a tweet posted by Musk (opens in new tab) shortly before Booster 7 fired up.

Expect these engine tests to occur on a regular basis over the next few weeks, as engineers ramp up their operations in preparation for the first orbital flight of both prototype #7 with Starship prototype #24 stacked on top.

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A typical Martian rock on Mount Sharp

10:03 am

Panorama of pass
Click for full 360 degree panorama.

Typical Martian rock
Click for full image.

Cool image time! The photo to right, taken by the Mars rover Curiosity on August 9, 2022, provides a nice close-up of what might be a somewhat typical rock on the flanks of Mount Sharp in Gale Crater, many layered with some of those layers extending outward to the side for somewhat ridiculous distances as thin flakes.

The scientists call it a float rock, because they think it actually fell from the cliff dubbed Bolivar in the panorama above. Thus, it gives geologists data on the layers higher up that are not easily accessible from Curiosity’s present position.

The panorama is a mosaic created from images taken by the rover’s right navigation camera on August 8, 2022. The white arrow marks the rock. The green dot marks the approximate location on the cliff face of a previously observed recurring slope lineae, streaks that appear to come and go seasonally whose origin is still not understood.

The red dots mark my guess as to the route engineers will pick for Curiosity as it weaves its way around the other float rocks ahead.
» Read more

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SpaceX gets FCC communications license for Starship orbital launch

8:47 am

Capitalism in space: The FCC yesterday approved SpaceX’s communications license for one or more Starship orbital launches, with a six month launch window beginning on September 1, 2022.

This FCC approval is not a launch license, which must be given by the FAA. It does tell us that SpaceX will not attempt the first orbital launch of Starship before the end of this month. It also tells us that the company likely plans on an aggressive test program from September ’22 through February ’23, assuming the FAA and the federal bureaucracy finally stops blocking that program.

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FCC cancels $900 million award to Starlink

3:07 pm

The FCC today canceled a $900 million subsidy it had awarded to SpaceX in December 2020 as part of a federal program to help establish broadband service in rural communities.

The reasoning for canceling the award given at the link is very unclear. However, since the award a lobbying effort by Starlink’s competitors — teamed up with Democrats in Congress — to cancel the award has been on going. It now seems to have succeeded.

Another clue to explaining this cancellation is timing. The award was announced at the end of the Trump administration, when his appointees controlled the FCC. The cancellation took place during the Biden administration, with the FCC now controlled by Democrats who are increasing revealing themselves to be very hostile to private commercial space in general and Musk and SpaceX in particular.

Nonetheless, it seems absurd to give SpaceX any such subsidy, regardless of the politics. As I said in February 2021:

No one, including SpaceX, should get these funds. SpaceX is proving they aren’t necessary to get the job done (bringing fast internet service to rural communities). Moreover, the federal government really doesn’t have the cash, deep in debt as it is.

Sadly, just because the FCC cancelled its award to SpaceX we should not expect as modern taxpayers that the money won’t be spent. Expect the Biden administration to instead dole it out to its preferred vendors.

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Fractures in the Martian northern lowland plains

1:35 pm

Fractures in the northern lowland plains
Click for full image.

Cool image time! The photo to the right, rotated, cropped, and reduced to post here, was taken on April 21, 2022 by the high resolution camera on Mars Reconnaissance Orbiter (MRO) of a spot in the Martian northern lowland plains.

Generally the surface of these lowland plains — especially at high latitudes above 30 degrees — tends to appear very water saturated, producing blobby features and what look like mud volcanoes. This picture however features something different, what the scientists have labeled fractures, geological features that appeared caused by dry conditions and sudden quake-like events. The break in the fracture near the top of the photo illustrates why water flow had little if anything to do with its formation. Other fractures in the full image show the same thing. Also the stippled surface along the picture’s right edge also suggest there is little near surface water or ice at this location.

The location, as shown by the overview map below, suggests that water might still have played a part, but only a long time ago.
» Read more

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InSight’s power status holding steady on Mars

9:47 am

InSight's status as of August 9, 2022

Yesterday the InSight science team posted the lander’s ongoing power status, as it has been doing about every week since in June the team announced that they expected power to run out sometime in August, ending the mission.

I have created the graph to the right, showing the data from all those updates, to try to glean the overall trends. The red line indicates the tau level of dust in the atmosphere, essentially telling us how much that dust is blocking light from the Sun. Normally outside of dust season this number should range from 0.6 to 0.7. Since May 17 that dust level has been steadily declining, which thus increases the amount of sunlight reaching the panels.

The blue line marks the amount of power the lander’s panels have been able to produce. The lack of change in this line reveals both good and bad news. The good news is that the power level is holding steady, at a level that allows InSight’s one operating instrument, its seismometer, to continue to function. Should this power level continue to remain stable, that seismometer should be able to operate past August, thus extending the instrument’s life longer than expected.

The bad news is that the power levels are not going up as the dust level is dropping. This suggests that the dust layer on the panels that is preventing them from generating power is actually getting thicker. InSight has still not experienced any puff of Mars’ weak wind capable of blowing dust off those panels. Instead, as the dust settles out of the atmosphere with the end of dust season, some is settling on the panels themselves.

As new updates arrive I will update this graph. Stay tuned. InSight is not yet dead, though the vultures are unfortunately circling overhead.

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Superheavy prototype #7 and Starship prototype #24 undergo static fire tests

8:41 am

Superheavy #7's first launchpad engine test
Click for original photo.

Capitalism in space: SpaceX engineers yesterday performed static fire tests of both its Superheavy prototype #7 and its Starship prototype #24.

The Superheavy prototype fired one engine, and did so only a few weeks after that prototype experienced an explosive event the launchpad during earlier fueling/engine tests. Yesterday’s engine test was the first time any Superheavy prototype had fired its engines on the launchpad.

The Starship prototype meanwhile fired two engines on a nearby vertical test stand.

SpaceX’s plan is to stack #24 on top of #7 and attempt an orbital launch test that will have the Superheavy prototype land in the Gulf of Mexico while the Starship prototype reaches orbit and then returns to Earth in the Pacific northeast of Hawaii. Based on the company’s normal pace of operations, that flight is probably only weeks away. However, before that flight engineers will have to do a full static fire test of all 33 of #7 engines, and then like do it again with Starship #24 stacked on top.

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SpaceX successfully launches 52 more Starlink satellites

7:24 pm

Capitalism in space: SpaceX tonight successfully used its Falcon 9 rocket to launch another 52 Starlink satellites into orbit.

The first stage completed its third flight, landing successfully on a drone ship in the Atlantic Ocean. The fairings also completed their third flight.

The leaders in the 2022 launch race:

35 SpaceX
29 China
11 Russia
6 Rocket Lab
5 ULA

American private enterprise now leads China 50 to 29 in the national rankings, and the entire world combined 50 to 37.

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Rocket Lab considering further targets for in-space Photon upper stage

12:12 pm

Capitalism in space: As noted during a speech yesterday by CEO Peter Beck, Rocket Lab is considering further interplanetary targets for its still functioning Photon upper stage, that helped launch NASA’s CAPSTONE mission toward the Moon.

Rocket Lab is continuing to operate Lunar Photon more than a month after it deployed CAPSTONE. The spacecraft is currently about 1.3 million kilometers from Earth, he said, and will swing back to Earth later in the month.

The spacecraft still has 10-15% of its propellant remaining. “As it scoots past Earth,” Beck said, “we’ll have a crack at doing something cool with it and see how far into the solar system we can get with it.”

Rocket Lab hopes to use a future Photon stage to send a probe to Venus, and is using the Photon in space now for engineering tests. It is also selling this technology as a viable cheaper alternative to the typically expensive interplanetary probes.

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Northrop Grumman partners with Firefly to make Antares entirely U.S. made

9:00 am

Capitalism in space: Because the Russian invasion of the Ukraine, Northrop Grumman yesterday announced that it has signed a deal with the rocket startup Firefly to replace the Russian engines and Ukrainian-built first stages on its Antares rocket.

Firefly’s propulsion technology utilizes the same propellants as the current Antares rocket, which minimizes launch site upgrades. The Antares 330 will utilize seven of Firefly’s Miranda engines and leverage its composites technology for the first stage structures and tanks, while Northrop Grumman provides its proven avionics and software, upper-stage structures and Castor 30XL motor, as well as proven vehicle integration and launch pad operations. This new stage will also significantly increase Antares mass to orbit capability.

The press release made no mention of launch dates. However, according to Reuters Northrop Grumman has purchased three SpaceX Falcon 9 launches in ’23 and ’24 to get its Cygnus cargo freighter into orbit in the interim and thus fulfill its ISS resupply contract with NASA.

After an earlier Antares failure the company (then Orbital ATK) had hired ULA’s Atlas-5 to launch Cygnus. ULA however is retiring the Atlas-5 after it completes its present full manifest, so this rocket was no longer available. ULA is replacing it with the Vulcan rocket, but that rocket is not yet operational due to delays in the delivery of its Blue Origin first stage engines. Thus, SpaceX was Northrop Grumman’s only viable option.

There is also a certain irony in the hiring of Firefly to replace the Ukrainian first stage. Firefly was saved from bankruptcy by a Ukrainian billionaire, Max Polykov. Though he has been forced to sell off his ownership in the company by the State Department, Firefly would not now exist to take this business from a Ukrainian company had Polykov not provided his financial help.

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Russia and China complete launches

8:45 am

Both Russia and a pseudo-commercial Chinese company today completed launches.

Russia used its Soyuz-2 rocket to launch a military reconnaissance satellite for Iran, along with 16 Russian smallsats. The rocket was originally going to launch a South Korean satellite, but that launch was cancelled due to Russia’s invasion of the Ukraine.

In China, the pseudo-company Galactic Energy used its four-stage Ceres-1 rocket to place three Earth observations satellites into orbit. Because three of the rocket’s four stages use solid rocket motors, they were likely reworked from military applications. Thus, Galactic Energy does nothing without the full approval and supervision of the Chinese government. It might have been funded privately, and focused on making profits, but it really owns nothing it builds.

Nonetheless, this was its third successful orbital launch, making it the most successful of these Chinese pseudo-companies. It is also developing a Falcon 9 clone rocket dubbed Pallas-1, which it hopes to launch next year.

The leaders in the 2022 launch race:

34 SpaceX
29 China
11 Russia
6 Rocket Lab
5 ULA

American private enterprise still leads China 49 to 29 in the national rankings, and the entire world combined 49 to 47. A SpaceX Falcon 9 launch later today should strengthen this lead again.

The leade

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August 8th quick space links

12:47 pm

Some quick links, provided by reader Jay:

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Sri Lanka blocks docking of Chinese spy ship as requested by India

11:47 am

The new Sri Lankan government, at the request of India, has rescinded the permission granted by the previous government that would have allowed a Chinese satellite tracking ship to dock at one of its ports.

In a written request, the Sri Lanka Foreign Ministry told the Chinese Embassy in Colombo not to go ahead with the visit, said an official involved in the process. “The Ministry wishes to request that the arrival date of the vessel Yuan Wang 5 in Hambantota to be deferred until further consultations are made on this matter,” the request says.

Sri Lankan President Ranil Wickremesinghe assured political leaders on Friday that the visit will not go ahead as planned.

The previous government, recently overthrown by a citizen revolt because of its green policies that produced starvation and bankruptcy throughout the nation, had agreed to the docking, changing years of cooperation with India. Apparently the new government has decided to renew that Indian alliance.

India in turn wishes to limit China’s ability to spy on its own satellites and operations in space.

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Further damage to Curiosity’s wheels

10:14 am

Curiosity wheel comparison of damage
For the original images, click here for the top photo and here and here
for the bottom photo.

The photo comparison to the right, created from high resolution images taken by Curiosity on Mars two months apart, provides us a new update on the state of the rover’s damaged wheels. It shows damage on the same wheel that I have been tracking for several years.

The numbers indicate the same treads, or grousers as termed by the science team. The “+” sign indicates spots where new damage has occurred since the previous photo.

The top photo was taken on June 3, 2022, and was the first to show new damage in more than five years. The bottom photo was taken on August 6, 2022, and shows that another small piece on the same grouser has broken off during the past two months.

Other than this change, however, the rest of the grousers appear unchanged. Moreover, a comparison with an earlier image of this same wheel taken in the summer of 2021 shows that grouser #6 as well as the unnumbered one just below appear also unchanged.

The damage in grouser #5 however is still concerning, and reflects the increasing roughness of the terrain as Curiosity climbs higher and higher on Mount Sharp. Though the science team has been very careful since the rover’s first few years on Mars to travel around obstacles that could damage the wheels, it apparently is becoming harder to do so.

However, even if this wheel eventually loses all the metal between the zig-zag grouser treads, the science team has said it has “proven through ground testing that we can safely drive on the wheel rims if necessary.” The team as also said they do not think that is likely, at least not for a long time, and based on the rate of damage documented by these pictures, this appears very true.

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India’s new SSLV rocket fails on first launch attempt

10:53 am

Delayed years because of India’s panic over the Wuhan flu, the first launch of that country’s new Small Satellite Launch Vehicle (SSLV) failed today when the rocket’s fourth stage apparently did not fire its engines properly.

The problem appeared to be the SSLV’s terminal stage, called the velocity trimming module (VTM). According to the launch profile, the VTM was supposed to have burnt for 20 seconds at 653 seconds after launch. However, it burnt for only 0.1 seconds, denying the rocket of the requisite altitude boost. Two satellites onboard the rocket – the primary EOS-2 Earth-observing satellite and the secondary AzaadiSAT student satellite – separated from the vehicle after the VTM burnt.

As a result, the two satellites were put in an orbit that was too low, which quickly decayed, destroying both.

Since this launch failed, I do not count it in the launch totals for 2022.

Considering that this was SSLV’s first launch, it was in that sense a test, and a failure therefore is not unexpected. India’s real problem is that the launch was delayed so long because of the Wuhan panic, thus allowing other competitors to catch up and pass India. While it is certain ISRO will try again, and eventually succeed, it will not get the market share it would have had, had it launched in 2020 as originally planned.

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SpaceX raises another $250 million in investment capital

8:58 am

Capitalism in space: SpaceX in July raised $250 million in investment capital from five unnamed investors, bringing the total raised in 2022 to $2 billion.

Added to the amount brought in before this year, SpaceX has raised about $9 billion in private capital, most of which is focused on financing the development of Starship/Superheavy. When you add the $2.9 billion contract it won from NASA to develop Starship as a manned lunar lander, the company has raised about $12 billion to build this heavy lift rocket.

The numbers demonstrate several things. First, Wall Street is apparently very confident SpaceX will succeed in building the rocket, and then make a lot of money from it. Second, the numbers prove it shouldn’t cost $60 billion and two decades to design and build a heavy lift rocket, as NASA has done with its SLS rocket. SpaceX is doing it for less than a fifth of the cost, in a third of the time.

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