Tag: engineering

The volcanic world of Io, as seen by Juno in all its fly-bys

9:16 am

Map of Io
Click for full resolution image.

The mosaic of images above, reduced and sharpened to post here, was compiled by citizen scientists Gerald Eichstädt, Jason Perry, and John Rogers from images taken of the Jupiter moon Io during the three close fly-bys by the orbiter Juno that occurred during its 55th, 57th, and 58th orbits. From the caption:

Global map of Io by JunoCam, combining maps from PJ55, PJ57 and PJ58. Both the sunlit side and the Jupiter-lit-dark side are included. PJ55 map by Gerald Eichstädt; PJ57 map by Jason Perry; PJ58 map by Gerald Eichstädt and John Rogers. Some scaling and shifting was performed in order to align the maps with each other and with the USGS Voyager/Galileo map. Colours were adjusted for better compatability. –John Rogers.

A labeled version, showing the names of many volcanoes but only of the areas photographed during the most recent 58th orbit fly-by on February 3, 2024, can be seen here.

As Juno’s later fly-bys will be progressively farther away, we will no longer get better views of Io until another spacecraft arrives in a Jupiter orbit capable to returning to Io, possibly decades from now. Though Europa Clipper will arrive in Jupiter orbit April 2030, that orbit is designed to repeatedly fly close past Europa, and will likely never get close to Io.

Thus, this map provides a baseline for determing any changes that occur on Io in the coming years.

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Ukraine: Russia using Starlink; Musk: No we don’t allow it

8:40 am

Over the weekend Ukrainain officials reiterated the claim from last week that Russia soldiers are using Starlink terminals illegally in occupied territories.

Earlier on Sunday, Ukrainian military intelligence said Russia is using Musk’s satellites to facilitate communications on the battlefield. The intelligence agency posted audio of an exchange between two Russian soldiers from the 83rd Assault Brigade in the Donetsk region, claiming that the Russians were speaking over Starlink.

Ukraine intelligence did not specify how many terminals it believed Russia had or how they might have been obtained. Still, Ukrainian Military Intelligence Spokesperson Andriy Yusov said that the use of Starlink by Russians was becoming “systemic.”

Musk soon responded on X, stating that SpaceX does not sell any of its terminals in Russia, and it immediately blocks use of stolen terminals in Russia once detected.

Musk however was very careful to say nothing about what happens in the occupied territories of the Ukraine where Russia troops operate. In the recent slow gains of territory that the Russians have achieved it could have captured terminals and begun using them, in their correct location. SpaceX would have no way to knowing who the user is.

I expect SpaceX will now take actions to deal with this issue, using information provided by the Ukrainians.

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SpaceX launches 22 Starlink satellites

11:50 pm

After about four scrubs due to weather, SpaceX today finally launched another 22 Starlink satellites into orbit, its Falcon 9 rocket lifting off from Vandenberg in California.

The first stage successfully completed its fourteenth flight, landing on a drone ship in the Pacific.

The leaders in the 2024 launch race:

12 SpaceX
8 China
2 Iran

At present American private enterprise leads the entire world combined 14 to 13 in successful launches.

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Status of ULA sale offer, as seen by bankers

12:31 pm

Link here. The article outlines the perspective of the banking community to the sale, relative to the three potential known purchasers, Blue Origin, Cerberus, and Textron.

[M]ost contended that a deal should have been finalized years ago, as SpaceX now dominates the global rocket launch market and has grabbed share from ULA’s best customer, the U.S. military. The sticky part of a sale, those bankers said, is the need for new ownership that can both streamline ULA and invest in further innovation.

The price is another sticking point: Bankers suggested ULA’s owners initially sought more than $4 billion for the company, but the consensus of a reasonable winning bid was in the range of $2 billion to $2.5 billion. As one banker emphasized to me, there’s more competition among heavy launch vehicles like Vulcan today than there was a decade ago, and the rocket’s only just getting going now.

First, it appears that Textron has already dropped out. Second, the reason the sale was delayed was solely the fault of Blue Origin, as delays in delivering its BE-4 rocket engine to ULA caused the first launch of the Vulcan rocket to be delayed years. The sale couldn’t happen until that rocket was proven flightworthy.

The analysis between Blue Origin and Cerberus makes it hard picking either as the likely winner. It suggests that while Blue Origin, as a rocket company, might be able to more quickly take advanage of the ULA’s assets, Cerberus would be a better managerial fit, more able to trim the fat and make ULA more competitive. For sure, Blue Origin shows no ability to trim fat or work fast.

The bankers also indicated a dark horse could still appear.

Hat tip to BtB’s stringer Jay.

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Axiom commercial manned mission to ISS splashes down safely

10:15 am

The four astronauts on Axiom’s third commercial manned mission to ISS successfully splashed down safely today in the Atlantic off the coast of Florida, with SpaceX recovery crews quickly picking them and the capsule Freedom up from the water.

The crew, made up of three European passengers and one Axiom employee, spent 21 days in space, about 17 on ISS. Axiom sold the tickets, and then purchased the ride from SpaceX and the time on ISS from NASA.

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SpaceX denies Russian claim that Starlink terminals sold illegally will work in the Ukraine

9:48 am

Russian media sources have recently claimed that Starlink terminals are being sold illegally to Russians for use in the Ukraine and in Russia near the Ukraine border, where they will supposedly work. SpaceX has now denied that claim.

[A]ccording to a report from Russian media outlet ComNews, vendors have been selling the equipment because it allegedly works near the country’s borders and in Ukraine, including the Russian-occupied regions of Donetsk and Luhansk, along with Crimea.

That’s contrary to the official Starlink map, which shows the internet access restricted in Russian-occupied areas. Still, as evidence, ComNews cites the online pages of several vendors, including one that notes the Starlink dish can be used in the “CBO,” a reference to Russian military operation in Ukraine. Although the Russian military has a ban on using Starlink equipment, some volunteer military troops have been buying it up.

The terminals are supposedly obtained secretly through Dubai. The SpaceX denial on X noted that they would deactivate any unauthorized terminal and that…

Starlink also does not operate in Dubai. Starlink cannot be purchased in Dubai nor does SpaceX ship there. Additionally, Starlink has not authorized any third-party intermediaries, resellers or distributors of any kind to sell Starlink in Dubai.

This story however does raise the long-standing question of how SpaceX can control the use and ownership of its terminals. Once shipped to a legal customer, what is to stop that customer from selling that terminal to anyone who can then ship it and sell it to some third party in a blocked region? SpaceX can probably identify the location of its terminals, and if one is found not to be where it should be, deactivate it. But could smugglers eventually block SpaceX from getting this location data?

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Russia completes its first launch of 2024

9:28 am

Russia early today successfully completed its first launch of 2024 by launching a classified military satellite, its Soyuz-2 rocket lifting off from its military Plesetsk spaceport in the northeast of Russia.

The launch placed the satellite in a polar orbit. Though this likely means the rocket’s lower stages crashed in very remote areas of the Arctic, either in Russia or over the Arctic Ocean, no word on if they hit the ground near habitable areas.

The 2024 launch race:

11 SpaceX
8 China
2 Iran
1 India
1 ULA
1 Japan
1 Rocket Lab
1 Russia

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More hiking possibilities on Mars!

2:21 pm

More hiking possibilities on Mars
Click for original image.

Cool image time! The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on September 27, 2023 by the high resolution camera on Mars Reconniassance Orbiter (MRO). Dubbed a “terrain sample” by the science team, this picture was likely chosen not as part of any specific research project but to fill a gap in the camera schedule so as to maintain that camera’s proper temperature.

When the team needs to do this they try to pick interesting targets. In this case the location is the region of many many parallel north-south fissures that extend for more than 800 miles south of the giant but relative flat shield volcano Alba Mons. These fissures are grabens, cracks formed when underground pressure pushed the ground up and caused it to spread and crack.

What attracted me to this picture is the ridgeline. It struck me as a wonderful place to hike. I have even indicated in red the likely route any trail-maker would pick to go from the valley below up onto the ridge, and then along its knifelike edge to the south. The height of the cliff down to the east valley averages about six hundred feet, guaranteeing beautiful scenery the entire length.
» Read more

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Pieces of a defunct ESA Earth-observation satellite will hit the Earth

10:05 am

The orbit of a defunct European Space Agency (ESA) Earth-observation satellite, ERS-2, is expected to decay later this month, with most of the satellite burning up in the atmosphere but some pieces surviving to hit the ground.

The satellite will break apart when it hits an altitude of about 50 miles (80 km), according to the FAQ [from ESA]. Most of the resulting fragments will then burn up in the atmosphere. Don’t worry too much about the ones the make it down to the surface, for they’ll contain no toxic or radioactive substances, according to ESA.

The article and the FAQ both go out of their way to minimize the risks. Both are correct. However, the risk of this debris hitting anyone, though very very very VERY small, still exists.

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India’s proposed space station now has a name: Bharatiya Antariksh Station

9:56 am

Though no money has yet been allocated to build it, and India’s space agency ISRO has only begun design work, it has now apparently decided to name the space station the Bharatiya Antariksh Station.

They tentatively hope to launch a test module in 2028 to do unmanned rendezvous and docking tests, with assembly beginning in 2028 and completed by 2035.

None of this schedule is certain of course. ISRO has been proposing this space station since 2017. Nothing has ever come of those plans.

Only now does this seem more likely, with India’s effort to shift its space effort from a government-owned and run program to a competitive commercial industry.

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India to do 19 launches through March 2025

9:41 am

India's planned launches through March 2025

According to India’s space bureaucracy IN-SPACe, that nation has planned as many as 19 launches through March 2025.

The image to the right shows the manifest that IN-SPACe released. That agency is tasked with encouraging India’s private and independnt space industry, and it claims that 30 missions in total are planned, with half by commercial companies. This number however includes payloads and suborbital test missions, not just orbital launches. Based on the manifest to the right it appears that 19 of these missions are launches, with six being entirely private launches. One of those private launches, the first of Agnikul’s commercial Agnibaan rocket, will be suborbital.

It thus appears that in 2024 India hopes to complete 14 orbital launches. If so, this would double that nation’s previous record of seven launches in a single year. This schedule is very aspirational, with those six entirely commercial launches likely not all happening as planned.

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Vibration testing of Sierra Space’s Tenacity mini-shuttle completed

9:01 am

NASA engineers have now completed vibration testing of Sierra Space’s Tenacity mini-shuttle, set to launch on a Vulcan rocket later this year.

Reading between the blather in the NASA press release at the link, it appears that testing was successful, proving that the Dream Chaser spacecraft can survive the vibrations of launch. This conclusion by me however remains unconfirmed. Engineers are now preparing the mini-shuttle for environmental testing.

Next up, Dream Chaser will move to a huge, in-ground vacuum chamber that will continue to simulate the space environment Dream Chaser will encounter on its mission. The spaceplane will be put through its paces, experiencing low ambient pressures, low-background temperatures, and dynamic solar heating.

Previously the launch date had been targeting April 2024, according to ULA officials. It now appears, from the vagueness of recent reports, as well as the actual testing now in progress, that the launch date has slipped. They appear to be targeting the first half of 2024, but are as yet unwilling to commit to a date.

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