Tag: engineering

SLS dress rehearsal countdown ends at T-29 seconds

7:47 pm

NASA’s fourth attempt to complete a full dress rehearsal countdown of its giant SLS rocket today ended at T-29 seconds, just short of the complete countdown.

It appears the countdown had one issue — a hydrogen fuel leak at the point where the umbilical fuel line attaches to the rocket — that mission control decided to ignore (or “mask” to use their word) so that they could proceed into the count as far as possible. It was this decision however that caused the two-hour delay in the countdown. They then resumed the countdown at T-10 minutes, the beginning of terminal count.

During the terminal count, the teams performed several critical operations that must be accomplished for launch including switching control from the ground launch sequencer to the automated launch sequencer controlled by the rocket’s flight software, and important step that the team wanted to accomplish.

NASA will hold a press conference tomorrow at 11 am (Eastern) to discuss the results of this dress rehearsal. While the leak is concerning, I expect NASA to decide that this dress rehearsal was a success, that they will roll the rocket back to the vehicle assembly building where they will fix this problem, after which the agency will declare the rocket ready to launch by the end of August.

While risky, doing otherwise likely raises other risks. If they decide to do another dress rehearsal the launch faces more delays. And waiting much longer continues to increase the danger that the solid rocket side boosters will not function as intended because they have been stacked almost a year longer than their accepted use-by date.

If this turns out to be the plan, expect the actual launch countdown to be as plagued with issues and delays and scrubs. NASA has yet to demonstrate it can do this smoothly with no problems. Worse, this level of mediocre performance has been par for the course for this entire SLS program.

If that launch should go smoothly it will be a welcome and unprecedented event.

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Water and dry ice at the Martian north polar ice cap

12:41 pm

water and dry ice at the Martian north pole
Click for original image. Click here for full image.

In our third Martian cool image of the day, we go to the north pole of Mars, as seen from orbit by the high resolution camera of Mars Reconnaissance Orbiter (MRO). Taken on March 30, 2022 and cropped and reduced to post here, this picture shows some of the distinct and unique geological features found only on the polar caps of Mars. From the caption by Candy Hansen of the Planetary Science Institute in Tucson, Arizona:

Both water and dry ice have a major role in sculpting Mars’ surface at high latitudes. Water ice frozen in the soil splits the ground into polygons. Erosion of the channels forming the boundaries of the polygons by dry ice sublimating in the spring adds plenty of twists and turns to them.

Spring activity is visible as the layer of translucent dry ice coating the surface develops vents that allow gas to escape. The gas carries along fine particles of material from the surface further eroding the channels. The particles drop to the surface in dark fan-shaped deposits. Sometimes the dark particles sink into the dry ice, leaving bright marks where the fans were originally deposited. Often the vent closes, then opens again, so we see two or more fans originating from the same spot but oriented in different directions as the wind changes.

The top layer of translucent dry ice falls as dry ice snow during the winter, than sublimates away with the arrival of spring. Since this photo was taken in autumn, we are looking at features left over from the activity from the spring and summer.

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Perseverance peers towards the rim of Jezero Crater

12:17 pm

Perseverance peers through winter haze
Click for full image.

Overview map
Click for interactive map.

In our second cool image from Mars today, the Mars rover Perseverance gives us its own long distance view of the dusty winter air inside Jezero Crater. The photo above, cropped and reduced to post here, was taken on June 16, 2022 by the rover’s left high resolution camera, and looks to the southwest towards the crater’s western rim.

As with today’s previous cool image from Curiosity, we can see several ranges, each with distance faded more by the dust that hangs in the air during the winter on Mars. In the foreground right is the nearest cliff of the delta that flowed into Jezero over time in the past. Next is a knob and ridge line, also part of that delta flow but farther away. Third are some farther ridges that might have been part of that flow but maybe not.

Faintest of all are the highest mountains that form the western ridge of Jezero Crater, barely visible in the haze.

The blue dot in the overview map to the right marks Perseverance’s approximate position when the photo was taken. The yellow lines my guess as to the area covered by the photo. The green dot marks Ingenuity’s present position after its last flight, much closer to the delta that I had predicted.

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Martian mountains, near and far

11:44 am

Navigation image
Click for full image.

Martian mountains, near and far
Click for full image.

Cool image time! The photo to the right, taken on June 18, 2022 by high resolution camera on the Mars rover Curiosity, provides a close-up of the area indicated by the arrow in the navigation camera image above taken three days earlier.

Because the rover had moved uphill slightly during those three days, the close-up can peek over what was the most distant ridge to see farther up Mount Sharp. (For context take a look at the overview map here.) All told, this close-up to the right shows four mountain ridges/ranges. First we have the ridgeline to the right, partly in shadow, which forms the right wall of the saddle that Curiosity appears heading for. Next we can see to the left the top section of the large 1,500 foot high mesa on the other side of the canyon Gediz Vallis. Note its many layers, all of which are going to become a major item of study as Curiosity gets closer.

Third we have a very rough and tumbled ridgeline, formed in a layer the geologists have dubbed the sulfate bearing unit. This layer tends to be very light in color, and more easily eroded. Curiosity is presently beginning to move into this layer as it climbs.

Finally there is the most distant ridge, which is simply the higher reaches of Mount Sharp though not its peak by a long shot.

The dusty winter air is quite evident by the chariscuro effect, causing the more distant ridges to appear more faded.

Note: This will be the first of three cool Martian images today. Stay tuned.

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SLS dress rehearsal countdown continues, though T-0 delayed two hours

9:33 am

The SLS dress rehearsal countdown is proceeding today as planned, though the countdown’s end at T-0 is now 4:38 pm (eastern), two hours later than previously announced.

Apparently they have delayed T-0 from the beginning of the two-hour simulated launch window to its end. This decision so early in the count suggests the launch team wants to give itself extra time either to deal with some issue that has come up that they haven’t told us about yet, or to give themselves more time in case some issue should come up.

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ISS forced to dodge space junk from Russia’s November ’21 anti-sat test

9:26 am

Last week the Russians were forced to use the engines of the Progress cargo capsule docked to ISS to shift the station’s orbit slightly to avoid a collision with some debris left over from Russia’s anti-satellite test in November 2021.

“I confirm that at 22.03 Moscow time, the engines of the Russian Progress MS-20 transport cargo ship carried out an unscheduled maneuver to avoid a dangerous approach of the International Space Station with a fragment of the Kosmos-1408 spacecraft,” Roscosmos chief Dmitry Rogozin wrote on Telegram (opens in new tab), according to a Google translation, using Roscosmos’ designation for Progress 81.

While the Russians have consistently denied the anti-sat test and the 1,500 satellite pieces it created would cause a collision threat, yesterday’s action was not a surprise, and was predicted by many right after the test.

The concern however is not the debris that has been identified and is being tracked, since collisions from that stuff can be predicted and avoided. The concern is from the smaller pieces that were not identified.

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SLS dress rehearsal countdown begins

10:07 am

NASA engineers began their fourth attempt to complete a full dress rehearsal countdown of the SLS rocket yesterday, with everything proceeding so far as planned.

Overnight, engineers powered up the Orion spacecraft and the Space Launch System’s core stage. Teams also configured several systems on the ground, rocket, and spacecraft and performed activities to prepare umbilicals that connect the rocket and spacecraft to the mobile launcher and are used to provide power, communications, coolant, and propellant.

Actual fueling begins tomorrow, when the countdown is supposed to conclude at T-0 at 2:40 pm (Eastern).

NASA live stream is available here.

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SpaceX completes its third launch in less than 48 hours

9:41 pm

Capitalism in space: SpaceX tonight successfully completed its third launch in less than 48 hours, launching a commercial communications satellite.

The first stage completed its ninth flight, landing on a drone ship in the Atlantic Ocean. At this moment, though the satellite is in orbit it has not yet been deployed.

The leaders in the 2022 launch race:

26 SpaceX
18 China
8 Russia
3 Rocket Lab
3 ULA

American private enterprise now leads China 35 to 18 in the national rankings, and leads the entire world combined 35 to 29.

At this point the U.S. is halfway to matching its annual record for launches of 70, set in 1966. With the year not quite half over, the U.S. is also only seven launches behind its total of 48 last year, which had been the most launches for the U.S. in a year since 1968. SpaceX itself is only five launches behind its own record of 31 from last year, and is easily on a pace to meet its goal of 60 launches this year.

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UAE’s Rashid lunar rover getting ready for November launch

10:31 am

The new colonial movement: Engineers have now delivered the United Arab Emirates’ (UAE) first lunar rover, Rashid, to France for testing and preparation for its early November launch on a Falcon 9 rocket.

The 10-kilogram rover will now spend a few weeks in Toulouse for vibration and thermal vacuum testing, a series of final checks to ensure it can survive the extreme environment during a rocket launch and spaceflight. It will then be moved to Germany, so it can be integrated with a Japanese lander, called Hakuto-R Mission 1, built by private company ispace inc, which will deliver the rover to the lunar surface.

Once completed, it will be shipped to the launch site in Florida’s Kennedy Space Centre in September.

Unlike the UAE’s Al-Amal Mars orbiter — which was mostly built in the U.S. by American companies and universities as part of a training program for UAE citizens, Rashid appears to have largely built in the UAE by those engineers.

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South Korea reschedules launch to June 21 after fixing sensor issue

9:28 am

The new colonial movement: South Korea space officials from its KARI space agency have now rescheduled the second test launch of their home-built Nuri rocket for June 21st, after replacing a fuel sensor on the rocket that was not working.

ARI said engineers identified the problematic part within the sensor and replaced it, and Kwon said they also found no other problems after inspecting the rest of the rocket. Kwon noted that the rescheduled launch date could be subject to change depending on weather conditions.

This will the second time KARI has attempted an orbital launch of Nuri, with the first experiencing an upper stage failure in October 2021.

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SpaceX successfully launches German military satellite

8:45 am

Capitalism in space: SpaceX this morning used its Falcon 9 rocket to successfully launch a German reconnaissance satellite, completing its second of three launches this weekend.

The first stage completed its third flight, landing at Vandenberg, in thick fog. The third launch is set for just after midnight tonight.

The leaders in the 2022 launch race:

25 SpaceX
18 China
8 Russia
3 Rocket Lab
3 ULA

American private enterprise now leads China 34 to 18 in the national rankings, and the entire world combined 34 to 29.

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Wavy crescent ridges on Mars

10:23 pm

Wavy crescents on Mars
Click for full image.

Cool image time! The photo to the right, cropped and reduced to post here, was taken on November 19, 2021 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows what the science team has labeled “Crescentic forms,” which in some ways resemble crescents that I featured in a cool image back in November 2020.

Unlike those earlier crescents, today’s are linked together to form a longer wavy line. Furthermore, today’s crescents include some positive relief, with some parts standing above the surrounding terrain. The earlier crescents were entirely carved out of the ground, forming depressions.

And yet, the method of formation for both must be somewhat similar. I say this based on their location, as shown in the overview map below.
» Read more

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Musk sued even as a handful of employees organize to slander him

9:59 am

Musk hate: In the past twenty-four hours, the rising effort to damage SpaceX and Elon Musk by many in our generally petty and envious elitist culture reached new levels, as illustrated by two different stories.

First, it appears a small group of anonymous “woke” employees at SpaceX organized a campaign to publish a letter condemning Elon Musk.

An open letter to company executives was posted in an internal SpaceX Microsoft Teams channel with more than 2,600 employees, the Verge reported on Thursday (June 16). The letter asks the founder of SpaceX and Tesla to change his ways. “Elon’s behavior in the public sphere is a frequent source of distraction and embarrassment for us, particularly in recent weeks,” the letter states.

…”As our CEO and most prominent spokesperson, Elon is seen as the face of SpaceX — every tweet that Elon sends is a de facto public statement by the company,” the letter adds. “It is critical to make clear to our teams and to our potential talent pool that his messaging does not reflect our work, our mission or our values.”

Unlike most corporations today — that routinely kow-tow to such attacks — SpaceX’s management pushed back hard, with the company’s CEO, Gwynne Shotwell, immediately issuing a strong company-wide email condemning the letter and announcing that an investigation has identified several people involved and has fired them. From her email:
» Read more

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Ariane-6 rocket delayed again

9:27 am

Capitalism in space: The first launch of ArianeGroup’s new rocket, Ariane-6, has been delayed again, and will not launch this year as planned.

The new delay appears mostly related to getting the rocket’s ground systems up and running.

The rocket, being built for the European Space Agency’s commercial division, Arianespace, had originally been scheduled for launch in 2020. Initially the rocket struggled to find customers, because it is not reusable and is thus more expensive. That changed in the past few months with the Ukraine War eliminating Russian rockets as a competitor combined with a new gigantic launch contract from Amazon to launch a large number of its Kuiper satellites using Ariane-6.

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SpaceX launches another 53 Starlink satellites

9:20 am

Capitalism in space: SpaceX today successfully used its Falcon 9 rocket to launch another 53 Starlink satellites into orbit, initiating a weekend where the company hopes to complete three launches in three days.

At the time of this writing, the satellites had not yet been deployed. The first stage landed successfully on the drone ship in the Atlantic Ocean, completing its 13th flight, a new record. The video of the landing at the link was also one of the clearest yet, with little drop-out or distortion.

The leaders in the 2022 launch race:

24 SpaceX
18 China
8 Russia
3 Rocket Lab
3 ULA

American private enterprise now leads China 33 to 18 in the national rankings, and the entire world combined 33 to 29.

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Firefly founder stepping down as CEO

9:08 am

Capitalism in space: Tom Markusic, the founder of the smallsat rocket startup Firefly, is now stepping down as CEO, apparently forced out by the company’s new investors.

The company said that Markusic would shift from chief executive to a new role of chief technical advisor, effective June 16. He will remain a member of the company’s board and a “significant minority investor” in the company.

The move comes four months after AE Industrial Partners (AEI), a private equity firm, agreed to acquire a “significant stake” in Firefly from Noosphere Venture Partners, which sold its interest in Firefly at the request of the Committee on Foreign Investment in the United States. Noopshere is a fund run by Ukrainian-born investor Max Polyakov. In March, AEI said it was leading Firefly’s $75 million Series B round.

The statement suggested that Firefly’s new owners wanted new leadership for the company as it prepares a second launch of its Alpha rocket. That launch is expected no earlier than mid-July from Vandenberg Space Force Base, nearly a year after the first Alpha launch failed.

Essentially, the two people that created this company and then saved it have been forced outt, largely as a result of federal government demands. Polyakov was forced to sell to AEI by the government because he was not American, and it appears AEI then forced Markusic out.

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NASA shuffles crew for first Starliner manned mission

8:48 am

In a press release yesterday, NASA announced the two-person crew that will fly on the first manned mission of Boeing’s Starliner capsule to ISS.

[C]ommander Barry “Butch” Wilmore, whom NASA assigned to the prime crew in October 2020, will join NASA astronaut Suni Williams, who will serve as pilot. Williams previously served as the backup test pilot for CFT [crew test flight] while assigned as commander of NASA’s Boeing Starliner-1 mission, Starliner’s first post-certification mission. As CFT pilot, Williams takes the place of NASA astronaut Nicole Mann, originally assigned to the mission in 2018. NASA reassigned Mann to the agency’s SpaceX Crew-5 mission in 2021.

The crew for this flight, delayed now more than two years, has changed several times. In 2020 astronaut Chris Ferguson dropped out for personal reasons. Then NASA listed the crew as Wilmore, Mike Finke, and Nicole Mann, with Williams then assigned to Starliner’s next mission, its first long term flight to ISS.

With this change, the crew has been reduced to two, and Finke is now listed as a backup should something further change with the prime crew.

The press release made no mention of an actual launch date, though it did say that Boeing and NASA are still reviewing the data from Starliner’s unmanned demo mission:

The Starliner team is in the process of delivering the initial test flight data to NASA and jointly determining forward work ahead of a crewed flight. These engineering and program reviews are expected to continue for several weeks, culminating in a launch schedule assessment at the end of July, based upon spacecraft readiness, space station scheduling needs, and Eastern Range availability.

The goal had been to fly before the end of this year. It appears NASA and Boeing are still pushing to meet that goal.

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Rock growths on Mars!

1:02 pm

Rock growths on Mars!
Click for full image.

Cool image time! The photo to the right was taken by the high resolution camera on the Mars rover Curiosity on May 15, 2022, and shows several incredibly strange vertical fingers of rock that appear to grow out of the ground. From the caption:

These likely formed as groundwater trickled through rock in the ancient past, depositing mineral cements over time; many years later, when the rock was exposed to the atmosphere, wind eroded the softer material around the cemented portions.

This formation explanation of course is only an educated guess. There are other possibilities, suggested by how cave formations grow over time, that are less likely but still must be considered. For example, maybe we are looking at a feature that grew upward as condensation from Mars’ once thicker and wetter atmosphere deposited new material on it over time.

Unfortunately, the image release does not provide a scale. My guess is that the longest finger is between six to twelve inches long, but it could be much smaller.

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First look at the new Starliner flight suit being made by Dover

10:08 am

It appears that the flight suit that the company ILC Dover is making for Boeing’s Starliner manned capsule has been unveiled not by the company but as part of an exhibit at the Kennedy Space Centers’ visitor complex.

Boeing has also signed contracts with two companies to provide two different flight suits.

Announced late last month, Boeing’s choice of ILC Dover’s AES came somewhat out of the blue. The aerospace company had previously selected another spacesuit manufacturer, the David Clark Company, to provide pressure garments for astronauts launching and landing on its CST-100 Starliner capsules.

An example of the David Clark suit, which was first revealed in 2017, has already flown twice to space on Boeing’s two orbital flight tests. Although astronauts have yet to fly on the Starliner, an anthropometric test device (instrumented mannequin) named “Rosie the Rocketeer” was dressed in the suit for the trial missions.

Boeing’s next and, as currently planned, final Starliner test flight will carry a crew, who will also wear the David Clark suit, according to a statement released by the company. The ILC AES will be introduced once Boeing begins flying astronauts on NASA-contracted missions to and from the International Space Station in 2023.

“In the spirit of commercial human spaceflight, we made the decision to bring an additional Starliner spacesuit supplier online to introduce additional redundancy, flexibility and competition for crew accommodations on future flights to low-Earth orbit destinations. We expect to introduce the new suits during operational missions, and are pleased to see the market opening up and allowing more options for Boeing as well as our government and commercial customers,” read the company’s statement.

In my opinion, the graphics at the link of both suits show them both to appear more comfortable and better looking than SpaceX’s Dragon flight suits. That opinion however is just a question of taste and style, and has nothing to do with the suits’ operation or use.

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Russian scientists defy Rogozin, will not reactivate German instrument on Spektr-RG telescope

9:51 am

It appears that the Russian astronomers who use their instrument on the Spekr-RG space telescope are refusing to follow the orders of Dmitry Rogozin to reactivate the German instrument — dubed eROSITA — which the Europeans shut down in response to the Russian invasion of the Ukraine.

[T]he head of the Russian Space Research Institute, Lev Matveevich Zelenyi, spoke out against the unauthorized activation of eROSITA to Gazeta: “Our institute – all the scientists – categorically object to this. This objection is both for political and technical reasons.”

“This is not a Russian device. I can’t judge how realistic this whole thing is, I don’t know if our specialists have processing codes… But even if they have, it will be simply impossible to publish this data – no journal will accept it and will do it right,” he added.

Rogozin however appears adamant about taking over eROSITA. But then again, Rogozin blusters a lot, with many of this worst blusters having no bite behind them.

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Curiosity: Into the mountains

11:48 am

Panorama on Mars, June 15, 2022
Click for full image.

Overview map
Click for interactive map.

Cool image time! The journey of Curiosity into the mountains of Gale Crater continues. The photo above, taken on June 15, 2022 by the rover’s left navigation camera, looks straight ahead at one possible route into those mountains.

The blue dot on the overview map to the right indicates Curiosity’s position. The yellow lines show the approximate area covered by the photo, by my estimate. The recurring slope lineae is a streak that comes and goes seasonally, and could be caused by some form of seepage. The marker layer, as indicated by the arrows, is a geological layer found at about the same elevation in many places on the flanks of Mount Sharp.

The red dotted line indicates the planned route of Curiosity, which it is presently striving to return to, having been forced to retreat from the Greenheugh Pediment because of its too-rough terrain.

For scale, Navarro Mountain is estimated to be about 450 feet high. Thus, the peak in the center of the panorama, which I think is the large mesa in the lower right corner of the overview map, is probably twice that height, about 1,500 to 1,700 feet high, and much higher than the two mesas that frame it on either side. Distance and perspective hide this difference.

When Curiosity finally gets inside Gediz Vallis and close to the side of that many-layered mesa, the view should be unbelievably amazing.

The science team has not yet revealed the precise route they plan to take to return to the planned route. While they may aim straight over the saddle in the photo above, I suspect they will instead bear west, following ground that is less steep.

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OneWeb successfully tests airplane wi-fi using its satellites

10:12 am

Capitalism in space: During an eleven hour test flight, OneWeb has successfully tested the use of its satellite constellation to provide wi-fi service during long international flights.

Flight tests will continue throughout the rest of this year, with certification of the Sidewinder terminal expected in mid-2023. OneWeb expects to launch its new service in the middle of next year. It has so far launched about two-thirds of its 648-strong constellation of satellites.

This puts the OneWeb and SpaceX’s Starlink constellation in direct competition, since both will be offering this service directly to airlines. Thus, for both the airlines and their customers, this competition will likely not only lower price, it will improve service.

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South Korea postpones tomorrow’s second test launch of its Nuri rocket

9:57 am

The new colonial movement: Because of unexpected sensor reading in the oxygen tank as the rocket was lifted upright at the launch pad, South Korea has postponed its planned launch tomorrow of its home-built Nuri rocket.

According to KARI [South Korea’s space agency], readings of the oxidizer tank sensor normally change when the rocket is being erected. Readings on Nuri’s sensor, however, did not show any change during the process. “The sensor itself could be problematic, or it could be an issue with the cable or the terminal box,” the official said.

This launch would have been the second attempt to complete an orbital launch, with the first Nuri launch failing in October 2021 when tanks inside the third stage broke free during launch.

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Evidence of explosion in ’21 detected from orbital images of Chinese launchpad

9:46 am

Explosion at Chinese spaceporty
Click for full image.

Using orbital images, an amateur space observer has detected evidence that an explosion had occurred at the Chinese Jiuquan spaceport some time in October 2021.

Evidence of the explosion was discovered by space enthusiast Harry Stranger using imagery from Airbus and CNES and posted on Twitter June 10.

The incident occurred at facilities constructed around 16 kilometers to the southwest of Jiuquan’s two main launch complexes. The pair of launch pads are used by the China Aerospace Science and Technology Corporation (CASC) for hypergolic Long March rocket launches for human spaceflight, civil, military and scientific missions and were unaffected by the blast.

…Further satellite imagery from Planet’s Super Dove satellites seen by SpaceNews indicates that the explosion occurred between 0316 UTC on Oct. 15 and 0407 UTC Oct. 16 (11:16 p.m, Oct. 14 and 12:07 a.m. October 16 Eastern).

At almost exactly the same time China had launched a manned mission from this same spaceport, so the explosion apparently was not related to that launch. Instead, the images suggest that this was related to testing of solid rockets, and could be related as well to the delay in any further launches of the Kuaizhou-11 rocket. According to a press release several months earlier, that rocket was being prepared for a launch by the end of 2021, but no such launch ever occurred.

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Dragon cargo launch now delayed until July to fix fuel leak

9:32 am

Capitalism in space: Having now identified the source of a toxic hydrazine fuel leak in a Dragon cargo capsule that had been scheduled for launch on June 10th, SpaceX has now delayed the launch until July 11th so that it can fix the leak.

After removing propellant from the vehicle, “SpaceX was able to narrow down the source of the issue to a Draco thruster valve inlet joint,” the agency said. “Teams will now remove the specific hardware to replace it ahead of flight.”

Based on standard SpaceX procedures, it will not only replace this one valve, it will carefully figure out why it failed, and introduce an upgrade to all such valves so that this leak issue is never repeated. Such a policy has generally not been followed with much enthusiasm by older rocket companies in the past half century. The result had been the reappearance of such problems again and again, instead of a slow decline as each was found and eliminated.

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Sierra Space developing crewed version of Dream Chaser; will train astronauts

9:24 am

Capitalism in space: In a press release mostly focused on touting the company’s new project to establish a training center for astronauts, Sierra Space dropped this bigger story:

A crewed variant of the Dream Chaser spaceplane is currently in development and will be operational in 2026, having successfully completed its System Requirements Review (SRR) earlier this month. Orbital Reef will be on orbit and operational in 2027.

Though it was always expected that the company would upgrade the cargo version of Dream Chaser it is presently building, until now it had been made no announcement to that effect. Moreover, until now Sierra Space has functioned much like the old big space companies, doing nothing without a contract from NASA. This effort to build a manned version of Dream Chaser is apparently occurring without any such contract. All Sierra has right now is a contract to launch cargo to ISS.

The astronaut training center fits in nicely with this new manned Dream Chaser, which also fits in nicely with Sierra Space’s partnership to build the commercial space station Orbital Reef.

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Ingenuity successfully completes its 29th flight on Mars

3:51 pm

Ingenuity's 29th flight, estimated

Based on this tweet posted yesterday, Ingenuity has successfully completed its 29th flight on Mars, placing it in “a better communication position with the rover.”

According to the helicopter’s flight log, the flight lasted about 66 seconds, was about 587 feet long, and had a maximum altitude of 33 feet.

On the overview map to the right the green dot marks Ingenuity’s position before the flight. The yellow line is my guess as to the approximate flight path for this 29th flight. In this new position the helicopter is better aligned with the hollow that Perseverance will climb (as indicated by the red dotted line), and will therefore also have better line of sight communications with it.

The flight itself tells us that the engineers have not only gotten the helicopter recharged, they have developed new flight software to compensate for the loss of a sensor that was used to determine Ingenuity’s elevation.

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An eccentric debris disk circling a nearby star

11:17 am

Eccentric debris disk around star.

Using the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile, astronomers have discovered that the debris disk surrounding a star about 60 light years away, discovered in 2006 by the Hubble Space Telescope, is not circular, but instead forms an eccentric ring about the star.

The photo to the right combines the Hubble data (the blue background) and the ALMA data (the orange-yellow ring). The star is the bright spot in the ring, not in its center but at one of the ellipse’s two foci.

This level of eccentricity, MacGregor said, makes HD 53143 the most eccentric debris disk observed to date, being twice as eccentric as the Fomalhaut debris disk, which MacGregor fully imaged at millimeter wavelengths using ALMA in 2017. “So far, we have not found many disks with a significant eccentricity. In general, we don’t expect disks to be very eccentric unless something, like a planet, is sculpting them and forcing them to be eccentric. Without that force, orbits tend to circularize, like what we see in our own Solar System.”

In other words, there must be at least one hidden planet, maybe more, orbiting the star, its gravity forcing the disk into this shape.

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Momentus concedes its Vigoride tug will probably not be able to deploy more satellites

9:32 am

Capitalism in space: Momentus yesterday conceded that because of the problems that have dogged the first flight of its Vigoride tug, it will probably not be able to deploy the remaining smallsats on board.

Previously the company had said that communications issues were interfering with deployment. This update revealed that the tug’s solar arrays had also not opened as intended.

After initially experiencing these anomalies, we were able to deploy two customer satellites from Vigoride on May 28. Since that time, we have continued efforts to deploy other customer satellites, but have not confirmed any subsequent deployments. While we previously established two-way communications with the Vigoride vehicle, we have not been able to continue such two-way communication, which we believe is due to the low power situation on the vehicle due to the deployable solar arrays not operating as intended.

Though this update is very unclear on this point, it appears that Vigoride was able to deploy three objects in total, or a total of six smallsats. How many additional smallsats failed to deploy is not clear.

The company plans its next launch in November, with additional launches next year.

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