Tag: Portal

Hubble’s wide field camera returns to operation

1:39 pm

Though the Hubble Space Telescope returned to science operations on March 12th after going into safe mode, its wide field camera did not.

Engineers however now report that they have successfully restored the camera to operations as well. The reason for the delayed restoration exemplifies Hubble’s aging status.

Analysis showed that voltage levels in WFC3 power supplies have slowly decreased over time as their electronics aged. The electronics experience colder temperatures when the hardware is turned off in safe mode. This factor coupled with the power the instrument components draw as they are turned back on contributed to the small voltage fluctuation that suspended WFC3 recovery operations. Further detailed analysis indicated that it would be safe to slightly reduce the low voltage limit to avoid a future suspend, and it would be safe to recover the instrument to its science state.

The instrument has now been safely recovered. Standard calibration of the instrument and other pre-observation activities will be conducted this week.

All the telescope’s equipment has been adjusted in recent years to deal with the varying ages of its instruments and its main structure. For example, this wide field camera was installed during the last shuttle serving mission in 2009, and is therefore one of Hubble’s newest components. It however is now more than a decade old, and thus needs careful handling to function properly.

Other components are far older, such as the primary motor to open and close the telescope’s “lens cap”. That failed during this safe mode, forcing engineers to switch to a back up motor to control the cap. Whether they can recover that primary motor is presently unclear, though unlikely.

Expect more such issues in the coming years.

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Starship update: Prototype #11 could fly tomorrow

9:09 am

Capitalism in space: According to this Starship update, the 11th Starship prototype is scheduled for its static fire dress rehearsal countdown today, with the possibility of its first flight as early as tomorrow.

This paragraph about SpaceX’s overall Starship program however is more significant:

Following SN11’s flight, SpaceX will move on to SN15, 16, and 17, alongside testing with Super Heavy prototypes BN1 and BN2, before shooting for an orbital launch with SN20 and BN3. In typical SpaceX-style, that orbital launch has an astonishing – and unlikely – “by July 1” target. At the very least, this target portrays SpaceX’s Starship drive to push the vehicle into operation.

The reason they are going directly from prototype #11 to #15 is because they scrapped #s 12, 13, and 14 after the flights of #9 and #10. They had learned enough, and those scrapped prototypes would not have taught them anything. Instead, they incorporated the learned changes to #15 and will fly that next.

The July 1st launch date is certainly overly optimistic. It also signals the company’s determination to try to get that first orbital flight off this year. Based on their pace, it would be foolish to dismiss this as a possibility.

It also signals what I think is an internal unstated goal within SpaceX to have Starship beat SLS into orbit. Nor would anyone be wise to consider that impossible. In fact, I consider it quite likely.

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SpaceX launches another 60 Starlink satellites

9:10 am

Capitalism in space: SpaceX early this morning successfully launched another 60 Starlink satellites into orbit using its Falcon 9 rocket.

The company also successfully used a first stage for a record ninth time, landing it on its drone ship in the Atlantic. The booster did all nine flights in just over two years.

The 2021 launch race:

8 SpaceX
6 China
3 Russia
1 Rocket Lab
1 Virgin Orbit
1 Northrop Grumman
1 India

The U.S. now leads China 11 to 6 in the national rankings.

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China launches three military ocean reconnaissance satellites

11:33 pm

China successfully used its Long March 4C rocket to launch three military ocean reconnaissance satellites on Friday, March 13, 2021 (in China).

The article also includes some details about the upcoming schedule of launches in connection with China’s space station, beginning with the April 29th launch of the station’s first module, Tianhe-1, followed in May by the launch and docking of its unmanned Tianzhou-2 cargo freighter, and then followed by the first crew in June.

The 2021 launch race:

7 SpaceX
6 China
3 Russia
1 Rocket Lab
1 Virgin Orbit
1 Northrop Grumman
1 India

The U.S. still leads China 10 to 6 in the national rankings.

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How the blobby craters on Mars help map the planet’s existing accessible water

2:45 pm

Distorted blobby crater rim in Utopia Planitia
Click for full image.

Today’s cool image on the right, rotated, cropped, and reduced to post here, is part of a series of cool images that have repeatedly shown the blobby and squishy look of crater impact sites in the Martian northern lowland plain dubbed Utopia Planitia. Taken on January 2, 2021 by the high resolution camera on Mars Reconnaissance Orbiter (MRO), it shows the southeast rim of a very distorted crater that appears filled with glacial material and is also surrounded by an apron of smooth material.

At 42 degrees north latitude, it is somewhat expected to find evidence of glacial-like features in such a crater. Moreover, throughout the 30 to 60 degree mid-latitude band in Utopia Planitia are found numerous such blobby craters (other examples found here, here, and here), all suggesting that the impact occurred on a flat plain with a layer of water ice close to the surface. The heat of the impact melted that ice layer. In such a circumstance, the crater rims were easily deformed because as liquid water (for a short time) it could flow into any number of shapes.

At least that’s my theory. According to Colin Dundas of the U.S. Geological Survey’s Astrogeology Science Center in Arizona,

The exact processes that create the patterns are still debated. The flattened/degraded rims are not necessarily related to this morphology, as such craters can have sharp rims, so they may relate to post-impact modification.

In other words, later erosion after the crater formed could have rounded the rim and maybe even distorted it from a circle.

Regardless, the processes that made this crater rim look as it does were clearly widespread, as shown in the wider view below, provided by the context camera on MRO.
» Read more

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Russia: Air leaks fixed on Zvezda

9:30 am

According to the Russian state-run press, Russian astronauts have completed their repair work on the ISS module Zvezda and are about to seal the module to test their work.

“The crew of the International Space Station has completed the repair and recovery work on the hull of the Zvezda module. In the coming days, Sergei Ryzhikov and Sergei Kud-Sverchkov will close the hatches in the Zvezda module to check the atmospheric level,” the press office said.

Previous reports suggested the astronauts had located a total of two cracks, both now sealed.

The larger question however remains. Are the cracks stress fractures, and if so do they suggest that Zvezda’s 20-year-old hull is beginning to fail? The Russians have been very silent about these questions, though they have admitted the possibility once or twice, almost as an aside.

Nor has NASA been forthcoming. The American space agency has apparently joined the Russians in keeping this problem out of the news, at all costs. Once, the employees at NASA were Americans who demanded openness from Russia and from themselves. No more. Increasingly our government workers are indistinguishable from Soviet apparatchiks, whose main goal was to protect the government from bad press.

If Zvezda’s hull is failing then ISS faces some very serious engineering issues. They can be solved, but not by silence and sticking one’s head in the sand.

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Hubble about to resume science operations even with new issues

9:14 am

Engineers have fixed the computer software issue that caused the Hubble Space Telescope to go into safe mode this week, and are preparing it to return to full science operations.

It appears the problem was caused by a software upgrade that caused a conflict.

More serious however was this problem, which could have damaged the telescope beyond repair had it had been randomly pointed at the Sun during safe mode.

In entering safe mode on Sunday, however, the team discovered that the aperture door located at the top of the telescope failed to automatically close. This door is a safeguard designed to keep the Sun’s damaging light and heat out of the telescope’s interior, protecting its sensitive instruments and their surroundings. It serves as a safety net if Hubble accidently points in the direction of the Sun due to an error or hardware problem.

…The team has looked at spacecraft engineering data, run various tests, and verified that the door did indeed remain open despite the commands and power being sent to close it. Additional attempts to move the door by sending commands from the ground to its primary motor also failed to make the door move. However, the same commands sent from the ground to its backup motor did indicate movement, and that motor is now set as the primary motor. The team is looking at options to further reduce any associated risk.

It appears the primary motor that moves the door has failed. Fortunately there is a backup motor, but this is just one more item where the telescope has lost redundancy. We are very lucky that during safe mode the telescope didn’t end up pointing at the Sun, even for a very short time, for that would have ended Hubble’s operation for good. I suspect the safe mode software includes protections against that occurrence, but the possibility nonetheless existed.

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Curiosity faces the mountains

11:48 am

A cropped section from Perseverance's 1st panorama
A cropped section from Perserverance’s 1st panorama.
Click for full image.

Though the present excitement over the spectacular images and sounds coming down from Perseverance is certainly warranted, what must be understood is that this rover is presently only at the beginning of its journey, and is thus sitting on relatively boring terrain, from a merely visual perspective. The scientists might be excited, but to the general public, all we really are seeing is a flat dusty desert with some scattered rocks on the floor. In the far distance can be seen some hills and mountains (Jezero Crater’s rim), but they are very far away.

Curiosity, which the press and the public has largely forgotten about, is actually just beginning what will likely be the most breath-taking part of its journey. As I noted in my last rover update last week, Curiosity is now at the very base of Mount Sharp, and is about to enter the mountain’s canyons and initial slopes. For its past eight-plus years of roving it has been on the flat floor of Gale Crater, followed by some weaving among the smallest foothills of Mount Sharp. The views have been intriguing and exciting from a research perspective, but hardly breath-taking from a picture-taking point of view.

That is now changing. The picture below, taken by Curiosity just this week, gives us a taste of what is to come.
» Read more

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Space Force awards launch contracts (two each) to ULA and SpaceX

10:08 am

Capitalism in space: On March 9th the Space Force announced that it has awarded four new launch contracts, two each to ULA and SpaceX, for a total cost of just under $400 million, all to launch in ’23.

Under the task orders issued March 9, ULA and SpaceX will each launch two missions. ULA was awarded $225 million to launch and integrate the USSF-112 and USSF-87 missions on its Vulcan Centaur rockets while SpaceX was awarded $160 million to launch and integrate USSF-36 and launch NROL-69 on its Falcon 9 rockets.

Based on these numbers it appears ULA is charging about $113 million per launch for its new Vulcan Centaur rocket, while SpaceX is charging about $80 million using its Falcon 9.

For ULA, that is less that what it would charge using its Atlas 5 rocket, but not by much. For SpaceX this price is high, probably because the military might be demanding the company use new boosters for its launches.

These high prices for both are to me a sign of how little our federal government cares about saving any money for the taxpayer. While the competition brought on by SpaceX’s arrival is saving the military money, the way these contract awards are structured, with both ULA and SpaceX guaranteed to win them, neither company has an incentive to reduce its prices. Instead, they can overcharge and the military can do nothing about it.

In a more sane world the military would use the competition in the launch market to get an ever better deal. Instead, our federal government sees its budget as a blank check, and they are using it.

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MEV-2 about to dock with communications satellite to extend its life

9:57 am

Capitalism in space: Northrop Grumman’s second Mission Extension Vehicle (MEV-2) is presently doing the last rendezvous maneuvers in the vicinity of one of Intelsat’s operating geosynchronous communications satellites in anticipation to its docking, when it will extend that satellite’s life by up to five years.

This is the second MEV to fly. The first successfully docked with a defunct 19-year-old satellite and brought it back into operation.

Meanwhile, in the Ukraine a new startup is proposing to use an upgrade of the automatic rendezvous and docking system once used by Progress and Soyuz capsules to create its own variation of MEV.

Kurs Orbital is raising $6.5 million in its first investment round this summer to start the demonstration vehicle that will rendezvous with an uncooperative object in low Earth orbit, he said. “I think that we will be on schedule for 2023 with a demonstration mission.”

The company plans to raise more money over the next few years to build a fleet of four vehicles to start offering de-orbiting services by 2025. Usov said de-orbiting is the low hanging fruit because it is a way to immediately help satellite operators make money.

Operators currently take geostationary satellites out of service to a graveyard orbit six to eight months before they are out of fuel. De-orbiting services would allow operators to keep the satellites in operation for several additional months and continue to generate revenues, Usov said. Those extra revenues would more than pay for the $10 million to $15 million de-orbiting service.

If successful, this company will be the third attempting to enter the robotic satellite serving business, with a number of others also aiming to make money removing space junk.

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NASA sets March 18th for next SLS static fire test

9:38 am

NASA has now scheduled the next static fire test of the core stage of its SLS rocket for March 18th.

The background:

NASA attempted the hot fire test on January 16, but computers terminated the test after 67 seconds instead of 485 seconds because of the conservative test parameters that were set. This is not a test vehicle, but the actual core stage that will be used for the first SLS launch. NASA needs to ensure the testing does not damage it.

NASA decided to redo the test and scheduled it for February 25, but a problem with a pre-valve forced another delay.

If this March test is successful, it will take a month to prep the core stage for shipment by barge to Florida, where it will take several months to prep it for launch linked to its two solid rocket boosters now stacked and ready for launch. If that schedule moves fast, NASA is still aiming for a late ’21 launch, though most industry experts expect that date to shift into early ’22.

If the March test has any problems however this schedule goes out the window. Worse, it increases the chance that the two boosters will have reached the end of their 12-month use-by date (approximately December ’21), and will have to be dissembled and inspected. If that happens the launch will certainly be delayed by many months.

There is another possibility. NASA might waive that 12-month use-by date requirement for the boosters. If the agency does this, however, it will be another example of the same management mistakes that caused both the Challenger and Columbia shuttle failures, a desire to put aside proper engineering to meet a schedule.

One more thought: That it takes about four months to assemble the solid rocket boosters for SLS illustrates well the cumbersome and inefficient nature of this rocket. Launches not only cannot happen within days, they really cannot happen for months. Depending on such a rocket with such a low launch cadence will make the exploration of the solar system practically impossible.

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SpaceX successfully launches 60 more Starlink satellites

8:59 am

Capitalism in space: SpaceX last night successfully launched another sixty Starlink satellites, raising the total launched to 1,265, with more than a thousand operating.

The company also landed the Falcon 9’s first stage for the sixth time while reusing both fairings.

The 2021 launch race:

7 SpaceX
4 China
3 Russia
1 Rocket Lab
1 Virgin Orbit
1 Northrop Grumman
1 India

The U.S. now leads China 10 to 4 in the national rankings. In fact, SpaceX alone has as many launches as China and Russia combined.

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