Tag: NASA

Webb gets its first large micrometeoroid impact

9:18 am

In a carefully worded press release this week, NASA revealed that one segment of the primary mirror of the James Webb Space Telescope had been hit by a micrometeoroid.

Between May 23 and 25, NASA’s James Webb Space Telescope sustained an impact to one of its primary mirror segments. After initial assessments, the team found the telescope is still performing at a level that exceeds all mission requirements despite a marginally detectable effect in the data. Thorough analysis and measurements are ongoing. Impacts will continue to occur throughout the entirety of Webb’s lifetime in space; such events were anticipated when building and testing the mirror on the ground.

The reason such events were expected is because — unlike most telescopes (including Hubble) — Webb’s mirrors are not enclosed in a tube for protection. To do so would have made the telescope far too expensive to build or launch.

After describing in great detail all the work done prior to launch to anticipate such hits and deal with them, the press release then mentioned this fact almost as an aside:

This most recent impact was larger than was modeled, and beyond what the team could have tested on the ground.

Localized damage to the primary mirror of any telescope is not unusual. With ground-based telescopes such issues are not infrequent and easily worked around. The same applies to Webb. The engineers will calculate how to calibrate this particular segment to minimize distortion from the impact.

However, that the telescope experienced a hit larger than ever modeled, so soon after launch, suggests that those models were wrong, and that larger and more frequent hits can be expected. If so, this could be very worrisome, as over the long run it could shorten the telescope’s life in space significantly.

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Fuel leak scrubs launch of Dragon cargo capsule this week

8:52 pm

A fuel leak detected during fueling of hydrazine in a Dragon cargo capsule as it was being prepared for a June 10th launch has forced SpaceX and NASA to delay the launch.

SpaceX detected “elevated vapor readings” of monomethyl hydrazine, or MMH, fuel in an “isolated region” of the Dragon spacecraft’s propulsion system during propellant loading ahead of this week’s launch, NASA said in a statement.

The fueling of the Dragon spacecraft is one of the final steps to prepare the capsule for flight, and typically occurs just before SpaceX moves the craft to the launch pad for integration with its Falcon 9 rocket.

The Dragon spacecraft has propellant tanks containing hydrazine fuel and nitrogen tetroxide oxidizer. The two propellants ignite upon contact with each other, providing an impulse for the cargo ship’s Draco thrusters used for in-orbit maneuvers.

Each Dragon spacecraft has 16 Draco thrusters, small rocket engines that generate about 90 pounds of thrust. The Draco engines are used for orbit adjustment burns and control the spacecraft’s approach to the space station, then fire at the end of the mission for a deorbit burn to guide the capsule back into the atmosphere for re-entry and splashdown.

According to the article, it is not yet confirmed that the leak came from the capsule. If so, however, it could become a more serious issue, especially with the recent story — denied strongly by NASA — that a hydrazine leak caused damage to the heat shield of Endeavour during the return of its Axiom commercial passenger flight.

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NASA awards Axiom & Collins Aerospace contracts to build spacesuits

10:07 am

Capitalism in space: NASA yesterday awarded separate contracts to two different companies, Axiom and Collins Aerospace, to build spacesuits for its astronauts, either when they do spacewalks in space or when they are exploring the lunar surface.

The contract enables selected vendors to compete for task orders for missions that will provide a full suite of capabilities for NASA’s spacewalking needs during the period of performance through 2034. The indefinite delivery and indefinite quantity, milestone-based xEVAS contract has a combined maximum potential value of $3.5 billion for all task order awards. The first task orders to be competed under the contract will include the development and services for the first demonstration outside the space station in low-Earth orbit and for the Artemis III lunar landing.

Each partner has invested a significant amount of its own money into development. Partners will own the spacesuits and are encouraged to explore other non-NASA commercial applications for data and technologies they co-develop with NASA.

More information can be found in each companies’ press release, located here (Axiom) and here (Collins).

These commercial contracts replace NASA’s own failed effort to make its own Artemis spacesuits, which spent fourteen years and more than a billion dollars before being abandoned by the agency because wouldn’t be able to deliver anything on time.

The contracts also continue NASA’S transition — as recommended in my 2017 policy paper Capitalism in Space [pdf] — from a failed space contractor to merely being the customer buying products from the commercial sector. The result is we now have a vibrant and ever growing private space sector with products available quickly and cheaply not only for NASA, but for others. The Axiom press release illustrates these facts with this quote:

The Axiom spacesuit is key to the company’s commercial space services. This new NASA contract enables Axiom to build spacesuits that serve the company’s commercial customers and future space station goals while meeting NASA’s ISS and exploration needs.

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SpaceX wins more NASA manned flights to ISS

9:52 am

Capitalism in space: NASA has now announced that it is buying five additional manned missions to ISS from SpaceX, beginning in ’26.

This new contract is in addition to a February ’22 NASA award that purchased three more Dragon flights.

After a thorough review of the long-term capabilities and responses from American industry, NASA’s assessment is that the SpaceX crew transportation system is the only one currently certified to maintain crewed flight to the space station while helping to ensure redundant and backup capabilities through 2030.

The current sole source modification does not preclude NASA from seeking additional contract modifications in the future for additional transportation services as needed.

The press release repeatedly makes it clear that NASA very much wishes to buy tickets on Boeing’s Starliner, but until it is declared operational it must give its business to SpaceX. Once Starliner begins flying, NASA will then buy seats on it and alternate between the two companies. Until then however this new SpaceX contract guarantees NASA enough flight capacity to keep ISS occupied, even if Starliner gets further delayed.

Regardless, Boeing has once again lost business to SpaceX because its Starliner capsule is not yet ready. In the long run this contract means fewer total flights for Boeing to ISS, which means less profits.

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MAVEN returns to full operation

9:42 am

NASA announced yesterday that engineers have finally completely restored its Mars orbiter MAVEN, after a three month period when the spacecraft was in safe mode due to an attitude control problem.

To fix the problem engineers uploaded new software that allowed the spacecraft to determine its orientation in space not from its onboard inertial units, but from locking onto stars in the sky.

All instruments were healthy and successfully resumed observations; however, the spacecraft was constrained to pointing at the Earth until testing of all-stellar mode was completed, so the instruments were not oriented as they normally would be during science operations. Nevertheless, some limited science was still possible, and MAVEN even observed a coronal mass ejection impact Mars less than two days after the instruments were powered on.

Moreover, for some parts of the year it will still need its inertial units, so a fix for those time periods is still required.

Regardless, MAVEN can now resume acting as a communications relay between the Earth and the rovers on Mars, which for the past year has become its prime mission. While both rovers can communication without that relay, it is often necessary depending on a number of factors, and it also provides redundancy and a greater communications capacity.

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Webb to release first science images July 12th

9:41 am

The science team for the James Webb Space Telescope announced today that the first infrared science images from the telescope will be released on July 12, 2022.

The first images package of materials will highlight the science themes that inspired the mission and will be the focus of its work: the early universe, the evolution of galaxies through time, the lifecycle of stars, and other worlds. All of Webb’s commissioning data – the data taken while aligning the telescope and preparing the instruments – will also be made publicly available.

In many ways this first release will likely mirror the first release of images from the Hubble Space Telescope in 1993, after its serious focus problem had been solved. Then, the science team and NASA picked images for the press conference that, to them, would pass what they called the “grandmother test,” whereby an ordinary person not familiar with space objects would still instantly recognize the object imaged.

The result of that criteria was that some of Hubble’s best ground-breaking first images were not included, such as its first sharp picture of the exploding star Eta Carinae. While the images shown were beautiful, they did not immediately demonstrate what Hubble was going to accomplish. The Eta Carinae picture did however.

Hopefully this time the scientists will be more daring, and have a greater respect for the general public, and include some infrared images that are not familiar to non-scientists. It is such data that is almost always the most exciting.

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MAVEN out of operation since February

5:48 pm

The American Mars orbiter MAVEN has been unable to do any science observations since February 22, 2022 because its attitude control system has not been functioning properly, according to a NASA update only released on May 18th, almost two months later.

In the weeks that followed, NASA managed to revive MAVEN from safe mode, but in a limited capacity. The orbiter is in a stable orbit with its primary antenna pointed at Earth to maintain high-rate communications with its flight control team. “In this configuration, however, MAVEN cannot perform communications relays for other spacecraft on Mars and is performing only limited science observations,” NASA officials wrote in the update (opens in new tab). “The mission team began science instrument recovery on April 20.” The orbiter normally serves as a communication relay for NASA’s Curiosity rover and Perseverance rover on Mars to beam the latest images and research from the Martian surface to Earth.

Though it can still do its own observations, MAVEN’s main task at this time is to act as a communications relay for the rovers on Mars. This issue prevents that task.

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SLS next dress rehearsal countdown scheduled for June 19th

8:44 am

NASA has now scheduled the next dress rehearsal countdown for its SLS rocket for around June 19th, with the rocket beginning its trip to the launch site on June 6th.

It appears the issues that prevented the completion of the dress rehearsal in April have all been addressed:

While inside the Vehicle Assembly Building (VAB), teams completed several major objectives, including assessing the liquid hydrogen system leak at the tail service mast umbilical, replacing the interim cryogenic propulsion stage (ICPS) gaseous helium system check valve and support hardware, and modifying the ICPS umbilical purge boots. The addition of hazardous gas detectors above the upper stage allows for additional visibility into any potential leaks during cryogenic operations.

Other than the rollout on June 6th, all future dates remain flexible, depending on what happens step-by-step.

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NASA blesses Starliner as ready for manned missions

9:04 am

Capitalism in space: In the post flight press conference on May 25th, NASA officials gave their official endorsement of Boeing’s manned capsule Starliner, making it clear they are ready to approve it for manned missions.

Steve Stich, manager of NASA’s Commercial Crew Program, was to the point:

“Putting the vehicle through its paces on this flight is really the only way to prepare us for the crewed flight test,” Stich said. “Once we work through all the data, we’ll be ready to fly crew on this vehicle.”

The “data” however includes two failed orbital thrusters on the capsule’s service module, and two failed attitude control thrusters on the capsule itself. While the capsule’s thrusters can be taken apart for analysis, because the service module is not recovered, burning up over the ocean, Boeing will have to try to figure out the cause of its thruster failures from the data and experimentation with a not-yet flown service module.

Even so, it appears NASA will not require Boeing to do another unmanned test flight. The capsule proved during the unmanned demo flight that it has more than ample redundancy in these thrusters, should some fail on a manned flight.

The plan right now is to get that next manned flight off by the end of the year, though it could slip into ’23 should it become difficult to pin down and fix the thruster issues.

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Starliner successfully lands in New Mexico

3:58 pm

Starliner on its way down

Capitalism in space: Boeing today successfully completed the safe landing of Starliner from an unmanned demo mission to ISS, making it the only American capsule to touchdown on the ground using parachutes. This was the second Starliner to do so, though the first demo mission was cut short just after reaching orbit.

The screen capture to the right comes from the live stream, about two minutes before touchdown. You can see the airbags deployed under the capsule, which inflated just after the heat shield was jettisoned.

The capsule landed only 0.3 miles from its target, an excellent result. Crews are now heading to the capsule at White Sands to carefully check it out, to make sure no hazardous fuel leaks pose a threat to those ground crews.

I must complement Boeing (and NASA) on providing very professional coverage. It has often been painful in recent years to watch any NASA broadcast because of the breathless propaganda the agency has somehow thought it needed to do. In this case however the announcers and the broadcast were calm, thoughtful, and very informative, focused not on emotion but on reporting what was actually happening. Kudos to Boeing!
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Watch Starliner’s return to Earth

8:32 am

The astronauts on ISS closed the hatch yesterday on Boeing’s Starliner manned capsule in preparation for its return to Earth today, with a planned landing at White Sands, New Mexico, at 6:49 pm (Eastern).

I have embedded NASA’s live stream below. The undocking at 2:36 pm (Eastern), with the live stream beginning at 2:30 pm (Eastern). After the capsule separates and ends joint operations with ISS the live stream will break off until 5:45 pm (Eastern), when it will resume to cover the landing.
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