Tag: engineering

September 2, 2022 Quick space links

4:36 pm

Courtesy of BtB’s stringer Jay.

The tweet however provides no date for the test, nor any information about this particular engine itself.

This is preliminary design work involving Earth-based tests. A later phase, not yet awarded, will move on to orbital tests.

Most of this new private capital apparently came from Saudi Arabia and Greece, and the constellation will start out focused on serving those regions as well as Luxembourg.

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Sunspot update: Solar activity continues to exceed sunspot predictions

3:50 pm

It is the beginning of September and time to post another update on the Sun’s ongoing solar cycle. Below is NOAA’s monthly graph tracking the number of sunspots on the Sun’s Earth-facing hemisphere, with the activity in August now added. I have also added some additional details to the graph to give the numbers a larger context.

Though sunspot activity dropped in August it remained significantly above the predictions of the panel of government solar scientists put together by NOAA. The predicted sunspot number for August, as indicated by the red curve, was supposed to be about 48. The actual number was 75.

» Read more

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Chinese astronauts complete first spacewalk using new Wentian module

10:05 am

The new colonial movement: Chinese astronauts yesterday completed their first spacewalk using the airlock on the new Wentian module that was recently launched to that nation’s Tiangong-3 space station.

The spacewalk lasted six hours, and was mostly designed to test the airlock itself as well as do the first tests of Wentian’s own robot arm. It appears they also installed an “extended pump set”, whatever that is, and did other work near the hatch. More here.

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NASA is paying Boeing twice as much as SpaceX for its manned flights

9:53 am

Capitalism in space: in an excellent analysis of the total amount NASA will pay both SpaceX and Boeing for all their manned flights to ISS before the station retires, Eric Berger at Ars Technica has determined that the agency will essentially pay Boeing twice as much per flight.

In 2014, NASA narrowed the crew competition to just two companies, Boeing and SpaceX. At that time, the space agency awarded Boeing $4.2 billion in funding for development of the Starliner spacecraft and six operational crew flights. Later, in an award that NASA’s own inspector general described as “unnecessary,” NASA paid Boeing an additional $287.2 million. This brings Boeing’s total to $4.49 billion, although Finch told Ars that Boeing’s contract value as of August 1, 2022, is $4.39 billion.

For the same services, development of Crew Dragon and six operational missions, NASA paid SpaceX $2.6 billion. After its initial award, NASA has agreed to buy an additional eight flights from SpaceX—Crew-7, -8, -9, -10, -11, -12, -13, and -14—through the year 2030. This brings the total contract awarded to SpaceX to $4.93 billion.

Since we now know how many flights each company will be providing NASA through the lifetime of the International Space Station, and the full cost of those contracts, we can break down the price NASA is paying each company per seat by amortizing the development costs.

Boeing, in flying 24 astronauts, has a per-seat price of $183 million. SpaceX, in flying 56 astronauts during the same time frame, has a seat price of $88 million. Thus, NASA is paying Boeing 2.1 times the price per seat that it is paying SpaceX, inclusive of development costs incurred by NASA.

Despite the larger payments to Boeing, the company could very well lose money on Starliner. The higher cost to NASA from Boeing is due almost entirely because the agency was absorbing more of its initial development cost. SpaceX’s Dragon capsule had already been flying cargo missions to ISS when these manned contracts were awarded. SpaceX merely had to upgrade its manned capsule. Boeing had to design and build it from scratch. Moreover, the contracts were fixed price, which means Boeing had to absorb more than a half billion in additional costs when it had to refly the unmanned demo flight of Starliner.

Finally, because of the delays, Boeing won less NASA business. It also has gotten none of the private commercial manned flights that are going on right now. Those contracts went to SpaceX, including all the profits. Whether Boeing can eventually win some private contracts down the road is unknown. It will certainly have to lower its price to compete with SpaceX.

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Rocket Lab completes first static fire test of previously flown rocket engine

9:34 am

Capitalism in space: Rocket Lab has successfully completed for the first time a full duration static fire test using one of its Rutherford rocket engines that had been flown on a launch earlier this year, recovered, and refurbished.

The engine was previously successfully launched to space and returned to Earth during Rocket Lab’s recent recovery mission, ‘There And Back Again’, launched on May 2, 2022. The mission was the first time Rocket Lab attempted a mid-air capture of Electron’s first stage, using parachutes on the rocket to slow its descent from space before a helicopter plucked the rocket from the sky as it approached Earth’s surface. The Electron stage was ultimately released for a soft ocean splashdown, before it was collected by vessel and returned to Rocket Lab’s production complex.

The refurbished Rutherford engine passed all of the same rigorous acceptance tests Rocket Lab performs for every engine, including 200 seconds of engine fire and multiple restarts. Data from the test fire shows the engine produced full thrust of 21kNs within 1000 milliseconds of ignition and performed to the same standard of a newly-built Rutherford engine. This Rutherford engine will now continue as an engine life-leader for future Rutherford development.

I have embedded a video of the full test below. This achievement makes Rocket Lab only the third company to successfully refire a previously flown engine, after SpaceX and NASA’s space shuttle engines. It might also be the first time an engine recovered from the ocean has been successfully refurbished. SpaceX had tried to do the same with early Falcon 9 first stages, before they could land vertically, but all accounts suggested the salt water made the engines unusable.

Based on the the quote above, however, this engine will not be used on a future flight, but for testing only. The company still intends to catch the stages as they descend by parachute with a helicopter, which will then transport them safely to land. Further attempts to do so will take place in later launches this year.

» Read more

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On Mars you can find glaciers everywhere in the mid-latitudes

12:42 pm

Glacial material in Mars' rift zone
Click for full image.

Cool image time! If you ever decide to have some fun exploring the archive of images being sent back to Earth by the high resolution camera on Mars Reconnaissance Orbiter (MRO), always remember that the latitude of the image will almost immediately help to explain the strange features that you see in each picture.

The hi-res photo to the right, rotated, cropped, and reduced to post here, was taken on May 22, 2022 and provides us a great example. The jumbled features in the depression on the image’s right half surely look like the glacial features seen routinely in the 2,000-mile-long strip found in the 30 to 60 degree band in the chaos terrain of the northern lowland plains. In fact, it is likely that cycles of ebb and flow of those glaciers helped shape this chaos of buttes and mesas and cross-cutting canyons.

This picture however is nowhere near any chaos terrain, or that 2,000 long strip. In fact, it is instead in an area that appears mostly formed by tectonic and volcanic activity, as the overview map below shows.
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Musk tweets that SpaceX wants to complete 100 launches in 2023

10:11 am

Capitalism in space: Elon Musk yesterday tweeted that SpaceX’ is now planning to attempt about 100 launches next year, which will almost double its expected output this year.

To get some perspective of this goal, 100 launches in a single year would be more launches than the entire world completed each year from 1991 (after the fall of the Soviet Union) through 2017 (before the recent resurgence of American commercial rocketry).

This decision probably relates to getting SpaceX’s Starlink constellation operational. Musk had hoped to begin Starship launches of Starlink soon, and now likely recognizes that such launches are probably more than a year away. Moreover, this year SpaceX engineers have demonstrated that the Falcon 9 can launch a lot of these satellites. So far in 2022 it has launched about 50 Starlink satellites per launch, and done so about 25 times. That’s 1,250 satellites in a little more than half a year. With a 100 launches, Falcon 9 could launch about 5,000 satellites alone next year, a pace that will certainly be sufficient in the short run to get Starlink operational.

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SpaceX completes static fire test of three engines on Superheavy prototype #7

9:57 am

Capitalism in space: SpaceX yesterday successfully completed the first static fire test of more than one engine on its Superheavy prototype #7, firing three engines for five seconds.

NASASpaceflight livestreamed the test, and its footage suggests that only two engines may have fully lit up, with the third perhaps aborting. Whether or not the third Raptor joined the party, however, it was still the first multi-engine Super Heavy static fire that SpaceX has performed.

I have embedded that footage below. Expect more such tests in the coming days. If all works as planned (something we should not expect as this remains a development program), the tests will culminate in an orbital test flight sending Starship on a one orbit mission around the Earth. At present SpaceX wants that flight to occur before the end of this year.

» Read more

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Webb obtains first direct infrared images of exoplanet

9:49 am

Webb's first infrared images of an exoplanet
Click for original image.

Using four different infrared instruments on the James Webb Space Telescope, astronomers have obtained the first infrared images of a gas giant with a mass about six to twelve times larger than Jupiter and circling about 100 times farther from its sun.

The montage to the right shows these four images. The white star marks the location of this star, the light of which was blocked out to make the planet’s dim light visible. The bar shapes on either side of the planet in the NIRCam images are artifacts from the instrument’s optics, not objects surrounding the planet.

This is not the first direct image of an exoplanet, as the Hubble Space Telescope has already done so, and done it in the visible spectrum that humans use to see. However, Webb’s infrared images provide a great deal of additional detail about this planet and its immediate surroundings that optical images would not. For example, the MIRI images appear to show us the outer atmosphere of this gas giant.

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Experiment on Perseverance has successfully produced oxygen repeatedly

9:29 am

An engineering experiment on the Mars rover Perseverance, dubbed MOXIE, has now successfully produced oxygen from the carbon dioxide in the Martian atmosphere, and has done so seven different times. After filtering an air sample…

…the air is then pressurized, and sent through the Solid OXide Electrolyzer (SOXE), an instrument developed and built by OxEon Energy, that electrochemically splits the carbon dioxide-rich air into oxygen ions and carbon monoxide. The oxygen ions are then isolated and recombined to form breathable, molecular oxygen, or O2, which MOXIE then measures for quantity and purity before releasing it harmlessly back into the air, along with carbon monoxide and other atmospheric gases.

Since the rover’s landing in February 2021, MOXIE engineers have started up the instrument seven times throughout the Martian year, each time taking a few hours to warm up, then another hour to make oxygen before powering back down. Each run was scheduled for a different time of day or night, and in different seasons, to see whether MOXIE could accommodate shifts in the planet’s atmospheric conditions.

During each run, the instrument produced about six grams of oxygen per hour, though a recent run produced more than 10 grams per hour, about half what a human needs to survive.

MOXIE runs only for short times, because it uses so much power the rover can’t do other work during runs. It is also only a technology test, so its operation is given a lower priority. Nonetheless, it appears that this test has successfully demonstrated that future astronauts on Mars will have a system for producing an unlimited supply of breathable oxygen. The next step would be to scale this up to produce enough oxygen to also fuel the astronaut’s return rocket.

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NASA thinks engine issue on SLS launch caused by misreading sensor

9:16 am

NASA engineers have now concluded that the improper temperatures in one engine in SLS’s core stage that forced the August 29, 2022 launch to be scrubbed were caused by a faulty sensor, and that the actual temperatures in the engine were correct.

During a news conference on Tuesday evening, NASA’s program manager for the SLS rocket, John Honeycutt, said his engineering team believed the engine had actually cooled down from ambient temperature to near the required level but that it was not properly measured by a faulty temperature sensor. “The way the sensor is behaving does not line up with the physics of the situation,” Honeycutt said.

The problem for NASA is that the sensor cannot be easily replaced and would likely necessitate a rollback to the Vehicle Assembly Building at Kennedy Space Center in Florida, a few kilometers from the launch pad. This would delay the launch of the rocket at least into October, and the space agency is starting to get concerned about wear and tear on a rocket that has now been stacked for nearly a full year.

With this SLS rocket, NASA management is now trapped between a rock and a hard place. The rocket’s solid rocket boosters has been stacked for just short of two years, almost a full year beyond their use-by date. Moreover, there are batteries on the rocket that only function for about a month before they must be replaced. Their replacement date is September 6th, which means if NASA cannot get the rocket launched by that date it will have to return it to the assembly building, delaying the launch to at least October. If it has to replace the solid rocket boosters the launch will likely then be delayed until next year, which will seriously impact the second SLS launch, set to send astronauts around the Moon and back.

At the moment the launch is scheduled for a two hour launch window beginning at 2:17 pm (Eastern) on Saturday, September 3, 2022. The countdown will be live streamed here. At the moment the weather for Saturday has improved, with s 60% chance the launch can proceed.

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Axiom gets NASA approval to fly second commercial manned mission to ISS

9:02 am

Capitalism in space: NASA and Axiom have worked out their contract to allow Axiom to fly its second commercial manned mission to ISS, now scheduled for sometime in the spring of 2023.

Through the mission specific order, Axiom is obtaining from NASA services such as crew supplies, cargo delivery to space, storage, and other in-orbit resources for daily use. The order also accommodates up to an additional contingency week aboard the space station. This mission is subject to NASA’s updated pricing policy for private astronaut missions, which reflects the full value of services the agency is providing to Axiom that are above space station baseline capabilities.

The order also identifies capabilities NASA will obtain from Axiom, including the return of scientific samples that must be kept cold in transit back to Earth, the return of a Nitrogen/Oxygen Recharge System (NORS) tank, the capability for last-minute return of two cargo transfer bags, and up to 10 hours of the private astronaut mission commander’s time during the docked mission to complete NASA science or perform tasks for NASA.

The flight, dubbed Ax-2, will carry four Axiom passengers, three of whom will be paying passengers. It will be launched by SpaceX on its Falcon 9 rocket, carrying one of SpaceX’s four reusable manned Dragon capsules.

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NASA awards SpaceX new $1.4 billion contract to launch its astronauts

8:56 am

Capitalism in space: NASA yesterday awarded SpaceX a new $1.4 billion contract to buy five more passenger flights to ISS, using SpaceX’s Falcon 9 rocket and Dragon manned capsules.

This follows a similar contract extension in February that awarded SpaceX three more NASA passenger flights.

For Boeing, this contract award must hurt. If its Starliner manned capsule wasn’t years behind schedule, with numerous engineering errors slowing development, some of the cash from these two new SpaceX contracts would have certainly gone to Boeing. Instead, the company has had to spend more than $400 million of its own money trying to get Starliner fixed and operational.

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August 31, 2022 Quick space links

3:47 pm

Thanks to BtB’s stringer Jay.

That’s nice, but years have passed and the first Dream Chaser cargo spacecraft, Tenacity, has still not flown. It is well past time for this company to finally get off the ground.

This also be the first spacewalk using the airlock on the space station’s new Wentian module.

It appears to be built by the pseudo-company Orienspace.

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Perseverance: Evidence of both past lava and liquid water on the floor of Jezero Crater

1:40 pm

Figure 6: Two models for geological history of Jezero Crater

Two new papers (here and here), published last week in Science and using data obtained during Perseverance’s first year of roving on Mars, strongly suggest that the floor of Jezero Crater was first formed by lava flows, either from impact or later flows from eruptions, followed by a period where liquid water interacted with these igneous materials to produce the chemistry seen today. From the first paper:

After emplacement of the igneous rocks on the crater floor, multiple forms of aqueous interaction modified—but did not destroy—their igneous mineralogy, composition, and texture. Evidence for alteration includes the presence of carbonate in the Séítah abrasion patches, the iron oxides in the Máaz formation abrasion patches (which we presume are due to iron mobilization and precipitation), and the deposition of salts including sulfates and perchlorate. More broadly, the appearance of possible spheroidal weathering textures suggests that aqueous alteration played a role in rock disintegration.

The graphic to the right, figure 6 in the first paper, shows two different models for the geological formation of the floor of Jezero Crater. “Basalt emplacement” are the lava flows.

According to the press release today [pdf], the first core samples that the rover gathered for later pickup and return to Earth will likely show the following:

The salts include sulfates, similar to Epsom salts, which are common on Mars. Most importantly, high levels of chlorine-containing salts are also present, such as chlorides (“table salt”) and perchlorates. These highly soluble salts reveal that the rocks were soaked in brines, and hence contain clear evidence of liquid water.

The on-going big geological mystery of Mars remains. The data suggests liquid water once existed as some form in Jezero Crater. Other data suggests liquid water existed elsewhere on Mars as well. Yet, no model exists that anyone accepts with any confidence that makes it possible for liquid water to exist on the Martian surface. Its atmosphere has always been either too cold or thin.

To underline this conundrum, note that in the graphic above, neither model includes a time period when liquid water sat on top of these layers. Though the evidence calls for liquid water at some time, the scientists do not feel confident enough to include it in these initial models.

One possible explanation that I sense some scientists are beginning to consider is the chemical interaction of melted ice at the base of past long gone ice glaciers. The ice would be frozen, but the glacier’s movement might create pockets of liquid water at its base, which over eons might result in these chemical reactions. If Jezero Crater had once been filled with glaciers, as many Martian craters in the mid-latitudes appear to be now, this could have provided the water necessary for the chemical modifications the scientists are finding.

This theory however is entirely speculative on my part, and has not yet been proposed by any scientists, though I have seen hints of it in a number of different research papers.

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Ursa Major makes rocket engine deal with Air Force

10:16 am

Capitalism in space: Ursa Major announced today that the Air Force has awarded it a contract to test and qualify its Hadley rocket engines for future military space missions.

Ursa Major will also be providing the Air Force Research Lab with statistically significant data sets from extensive testing of multiple Hadley engines, including measurements of specific impulse, or ISP, combustion stability, vibration and shock profiles, and range of inlet pressures and temperatures.

Hadley will be qualified using similar metrics according to an internal test plan based on industry guidelines and best practices, focusing on engine life, operating space, functional requirements, and performance. The qualification test campaign under this effort will include runtime at and beyond the extremes of the power level and mixture ratio targets, demonstrating that Hadley operates safely and reliably within the power level and mixture ratio required for missions of DOD interest.

Ursa Major was founded by the engineers who developed SpaceX’s Merlin engine. It has already won a number of rocket engine contracts, including an order for 200 Hadley engines from rocket startup Phantom Space., and a contract with Northrop Grumman to replace the Russian-built engines on its Antares rocket with Ursa Major’s larger Arroway engine. [Ed: Ursa Major doesn’t have this contract, Firefly does. Ursa Major’s Arroway is simply comparable and competitive for the same business.]

Getting the Hadley engine certified by the Air Force will instantly make this engine more appealing to numerous rocket companies. In fact, it will make Ursa Major as a company more appealing. If this certification moves forward quickly, expect the Air Force to follow with a certification program for the larger Arroway engine. And if that occurs this engine might supplant other engines produced by Aerojet Rocketdyne and Blue Origin, especially because it appears that Ursa Major is using the same manufacturing philosophies of SpaceX, focusing not so much on design as assembly-line manufacturing, as shown by its 200 engine contract with Phantom.

Thus, it appears focused on producing many engines at less cost, and quickly.

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Webb’s infrared view of a face-on spiral galaxy

9:44 am

M74, as seen by Webb and Hubble combined
Click for original image.

Using the James Webb Space Telescope, astronomers have produced a false-color infrared view of M74, a face-on spiral galaxy located 32 million light years away.

The montage above shows that image to the right, with a Hubble optical image to the left. In the center both images are combined.

The addition of crystal-clear Webb observations at longer wavelengths will allow astronomers to pinpoint star-forming regions in the galaxies, accurately measure the masses and ages of star clusters, and gain insights into the nature of the small grains of dust drifting in interstellar space.

Because infrared can see through cold dust, it provides a much sharper view of this galaxy’s central regions.

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Starlink experiences major outage lasting hours

9:32 am

For what appears to be the first time, SpaceX’s Starlink satellite constellation yesterday experienced a major outage, covering users across the entire world and lasting hours.

Apparently, users in the U.S., New Zealand, the Netherlands, and Mexico reported issues.

The global outage lasted for a few hours for most users, but connectivity returned with a “Degraded Service” message that meant it wasn’t fully operational. Some users on Reddit also reported that their connection kept going from degraded to offline. “Our team is investigating and will resolve as soon as possible,” the Starlink service message read. However, the company hasn’t released a public message acknowledging the outage.

Based on how this system is designed, it seems that only a software issue could cause an outage that affected so many users in so many different places. Even then, such an issue would have to impact multiple independent orbiting satellites, or multiple independent terminals, and do so all at once, an event which seems difficult if not impossible.

This all suggests that someone hacked the system and sabotaged it. Recently a professional hacker demonstrated that it was possible to hack into a single Starlink terminal. From there, it may be possible to access the software on board the satellites and sabotage that.

If so, SpaceX has a very serious problem.

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SpaceX signs deal with Royal Caribbean to use Starlink on its cruise ships

9:21 am

Capitalism in space: SpaceX has won a contract with the Royal Caribbean cruise line to provide broadband internet service to its passengers using SpaceX’s Starlink satellite constellation.

Deployment of the Starlink technology across the fleet will begin immediately, leveraging the insights obtained from the trial onboard Freedom of the Seas, which has received tremendous positive feedback from guests and crew. The installation is slated to be completed by the end of the first quarter of 2023.

The apparent success of Starlink on Royal Caribbean’s ships suggests it will quickly start appearing on other cruise lines shortly.

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Orbit Fab to offer orbital depot for refueling hydrazine fuel in satellites

9:16 am

Capitalism in space: Orbit Fab is now offering to launch for satellite customers an orbital hydrazine fuel depot, essentially a “gas station” in space, that can be used to refill that fuel on geosynchronous satellites.

Orbit Fab, a startup developing infrastructure for in-space refueling of spacecraft, will start offering hydrazine for satellites in geostationary orbit as soon as 2025 at a price of $20 million.

The company announced Aug. 30 its plans to start offering refueling services for GEO spacecraft using a depot and “fuel shuttle” spacecraft. That depot will also be able to support spacecraft such as servicing vehicles that can travel to the depot for “self-service” refueling.

At the $20 million price announced by Orbit Fab, the company would provide up to 100 kilograms of hydrazine. It’s the first time that the company has set a price for providing fuel, a move it says it made to help potential customers better understand the economics of refueling.

The depot would be placed in orbit slightly above that of geosynchronous satellites. A shuttle robot would dock with it, obtain the fuel, and then fly to a customer’s satellite, dock and refuel it. If that shuttle is built by Orbit Fab, the customer’s satellite will need the company’s standard refueling port. For geosynchronous satellites without that port, Orbit Fab is willing to partner with other orbital refueling and satellite servicing spacecraft, such as Northrop Grumman’s and Astroscale’s repair robot satellites.

This plan has several firsts. It is the first to offer a price for a specific amount of fuel. It also appears to be the first to refuel the hydrazine in satellites. Finally, it illustrates the on-going compartmentalization of the satellite servicing industry. Some companies are making tugs. Some are launching repair robots. Others are making robots to remove space junk. And Orbit Fab is going to build fuel stations where everyone else can get fuel.

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Engineers fix problem that caused data to arrive garbled from Voyager-1

9:00 am

By switching computers on Voyager-1 — now in interstellar space and having recently celebrated its 45th anniversary since launch — engineers were able to prevent data from coming back garbled from the spacecraft.

Earlier this year, the probe’s attitude articulation and control system (AACS), which keeps Voyager 1’s antenna pointed at Earth, began sending garbled information about its health and activities to mission controllers, despite operating normally. The rest of the probe also appeared healthy as it continued to gather and return science data.

The team has since located the source of the garbled information: The AACS had started sending the telemetry data through an onboard computer known to have stopped working years ago, and the computer corrupted the information.

Suzanne Dodd, Voyager’s project manager, said that when they suspected this was the issue, they opted to try a low-risk solution: commanding the AACS to resume sending the data to the right computer.

The switch worked. The mystery now is figuring out why the AACS started using that long-decommissioned computer, which could indicate another computer or software issue elsewhere in the spacecraft.

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SpaceX launches another 46 Starlink satellites into orbit

10:50 pm

Capitalism in space: Using its Falcon 9 rocket, SpaceX tonight successfully placed another 46 Starlink satellites into orbit, launching from Vandenberg Space Force Base.

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

The leaders in the 2022 launch race:

39 SpaceX
33 China
11 Russia
6 Rocket Lab
5 ULA

American private enterprise now leads China 54 to 33 in the national rankings, and the entire world combined 54 to 51.

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InSight power levels continue to hold steady

2:35 pm

InSight power levels through August 27, 2022

According to a new update posted today by the InSight science team, the power being generated by the lander’s dust-covered solar panels once again did not decline last week, holding at 400 watt-hours generated per day for the fifth week in a row.

The graph to the right shows the trends since May. The dust in the atmosphere is indicated by the red line, marking what scientists call the tau level. A normal level outside of the winter dust season should be between 0.6 and 0.7 tau. Even though that dust season has been ending, that level has remained high, thus cutting off more of the sunlight that the Mars lander could use to generate the electricity needed by its seismometer.

That the power generated continues to hold steady however suggests that InSight’s seismometer might be able to continue working into September, detecting Martian earthquakes. The scientists had predicted the spacecraft would die sometime around now. Without doubt they are thrilled their prediction appears wrong.

That the lander might last longer also increases the chance that it might experience a wind event, such as a dust devil, that could blow the solar panels clear of dust and save the lander entirely. All it needs is one such event, which sadly has not occurred since InSight landed on Mars in 2018.

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Martian auroras as seen by UAE’s Al-Amal orbiter

10:42 am

Aurora types on Mars
Click for full image.

Using data gathered by the Al-Amal orbiter (“Hope” in English), scientists have identified three types of aurora on Mars. The image to the right, figure 1 from their paper, shows these types, crustal field aurora, patchy aurora, and sinuous aurora. From the abstract:

We categorize discrete auroral patterns into three types: those near strong vertical crustal magnetic field, patchy aurora near very weak crustal fields, and a new type we call “sinuous,” an elongated serpentine structure that stretches thousands of kilometers into the nightside from near midnight in the northern hemisphere.

All three types generally occur during the Martian night, and evolve quickly over periods of less than 45 minutes. The first type, which is generally the brightest, forms over terrain where Mars’ residual magnetic field is strongest and vertically oriented, and was most often seen over the southern cratered highlands centered between the large impact basins Argyre and Hellas. The third type, sinuous aurora, was more unusual:

These we are calling “sinuous discrete aurora,” due to their thin, elongated, and sometimes serpentine shapes. They share several key traits: (a) they appear in the northern hemisphere away from strong crustal fields, (b) they usually connect to the dayside in the far north but also sometimes separately at lower latitudes, (c) they extend for thousands of kilometers into the night side, (d) they appear on both dusk and dawn sides, and (e) their shapes change moderately and brightnesses shift by factors of up to two over timescales of ∼20 min (i.e., the time between swaths, as shown in the differences between Figures 1j and 1k [in the figure above).

The existence of aurora on Mars has been known since the 2000s. These observations however are the first that show more details beyond a fuzzy patch.

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Changes on Mercury detected by Messenger over four year time period

9:43 am

Changes on Mercury seen by Messenger from 2011 to 2015

Using archival data collected from 2011 to 2015 while the orbiter Messenger circled Mercury, scientists have located twenty spots on the planet where something changed during that time period. The map to the right, adapted from the paper, indicates those locations. From the paper’s abstract:

We identified at least one change likely resulting from a newly formed impact crater with bright rays that extend away from the site. If all the changes result from impact events, then the present-day rate of impactors striking the innermost planet is 1,000 times higher than models predict. Therefore, we investigate other sources for these detected changes. We located several changes on steep slopes near tectonic landforms, consistent with ongoing tectonic activity. Additionally, we identified several changes in areas adjacent to hollow formations, consistent with present-day activity. These detected changes will be critical targets for the upcoming BepiColombo mission.

The data suggests several things. First, if the changes all come from impacts, than the number of asteroids in the inner part of the solar system where Mercury orbits the Sun is much higher than believed. Since it is very hard to observe asteroids there because of the Sun, this very well might be true.

Second, if the changes were not all caused by impacts, then they occurred either from earthquakes or the environmental extremes caused by daily and seasonal changes.

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Astra gets contract to provide engines to OneWeb satellites

8:59 am

Capitalism in space: Astra, the startup rocket company that recently announced a cessation in launches, has won a contract to provide engines used by OneWeb satellites to maneuver in orbit.

he Astra Spacecraft Engine was designed by Apollo Fusion, which Astra acquired last year. It is an electric Hall engine and has been used by York Space Systems, Spaceflight’s Orbital Transfer Vehicle (OTV) Sherpa-LTE, and a U.S. Air Force intelligence satellite. Astra signed a deal earlier this year to supply the engines to LeoStella.

In retrospect, the purchase by Astra of Apollo last year was a signal that the company might be shifting its gears away from rocketry, at least in the short term. This contract, along with the others won by Apollo before Astra bought it, provides Astra a survival profit stream even as it has leaves the rocket launch market while attempting to develop its proposed larger Rocket-4. Whether it can resume launches eventually remains somewhat doubtful, as a number of new rocket companies should become operational in the interim, making that smallsat launch market very crowded.

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August 29, 2022 Quick space links

2:19 pm

Courtesy of BtB’s stringer Jay:

As I’ve said numerous times, I’ll believe this engine is a flight engine when I see it in flight.

The link goes to the research paper from the Beijing Institute of Space Mechanics and Electricity, which is in Chinese except for the abstract. This tweet highlights the “leg deploying test and full-scale landing impact experiment” from that paper.

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