Tag: engineering

Defunct Pentagon weather satellite breaks up

10:40 am

According to the Space Force as well as two commercial space tracking companies, a defunct military weather satellite launched in 1997 has broken up into more than fifty pieces.

The satellite, dubbed DMSP-5D2 F14, was in a sun-synchronous orbit over the poles. What makes the break-up significant is that it is not the first of this design of weather satellites to do so.

DMSP-5D2 F14 is part of a family of spacecraft that have suffered breakups in orbit. The F12 satellite broke up in October 2016, following the breakup of F13 in February 2015. In 2004, the F11 spacecraft broke up, creating 56 pieces of tracked debris. All the satellites had a battery assembly with a design flaw that made them vulnerable to explosion.

A similar spacecraft design was used for a line of civilian polar-orbiting weather satellites operated by the National Oceanic and Atmospheric Administration. The NOAA-16 satellite broke up in November 2015, followed by NOAA-17 in March 2021.

Overall the military launched nine satellites of this design, while NOAA launched three. Of these twelve satellites six have now broken apart. We should expect a large percentage of the remaining six to also break up.

This story explains why in the last ten years a number of companies have appeared attempting to develop the technology to remove space junk. There is a desperate need in the satellite industry for this capability, and those space junk companies are aiming to make profit from this need.

Note I do not expect or want the government to take the lead in this. This issue is mostly a need of the satellite industry, of which the world’s governments are merely just one more participant. This industry should band together to set up a fund to pay for this work, with those governments joining as just one more partner.

11 comments

SpaceX experiences a launch abort at T-0

10:29 pm

During a launch attempt tonight from Cape Canaveral in Florida, SpaceX experienced a launch abort at T-0 seconds for reasons that have not yet been determined but apparently were complex enough that mission control decided to scrub for the evening. No new launch has been scheduled as yet.

The launch was to have placed four smallsats into geosynchronous orbit. The satellites were built by the satellite company Astranis, which appears to be the first to launch smallsats to geosynchronous orbit. It had already placed one in orbit, and these four satellites expand its constellation.

Leave a comment

China launches a communications test satellite

3:36 pm

According to China’s uninformative state-run press, it today launched “a test satellite for communication technology,” its Long March 3B rocket lifting off from its Xichang spaceport in southwest China.

No other details about the satellite were released. Nor did the state-run press provide any information about where the rocket’s lower stages, using very toxic hypergolic fuel, crashed inside China.

As is usual for China, it is doing a lot of launches at the end of the year. Though weather might be a factor, I also suspect it is the ordinary “use-it-or-lose-it” symptom of a government-run communist society. Budgets are set for the year. Government agencies find that they better launch or they will lose that budgeted amount in the next year’s budget.

This might not apply to China but if so it would explain its strange end-of-year launch pattern.

The leaders in the 2024 launch race:

132 SpaceX
64 China
16 Russia
13 Rocket Lab

American private enterprise still leads the rest of the world combined in successful launches 151 to 96, while SpaceX by itself leads the entire world, including American companies, 132 to 115.

Leave a comment

Perseverance takes its first good look west at its future journey

12:32 pm

Peservance looks west
Click for original image.

Cool image time! The picture to the right, reduced and enhanced to post here, was taken today by the left navigation camera on the Mars rover Perseverance. Though I am not 100% certain, I think this picture looks almost due west, and is aimed not only at the rover’s near term target, Witch Hazel Hill, but the rover’s long term and very important goal, the Nils Fossae ridge and canyon that appears to be crack formed during the impact that created giant 745-mile-wide Isidis Basin. Jezero Crater sits on the western rim of that impact basin.

The rover team expects to reach Witch Hazel Hill within days. To get there quickly the team has moved the rover more than a thousand feet west and dropped down from the rim about 170 feet in just the past ten days.
» Read more

Leave a comment

Land of dust devils

2:17 pm

Land of dust devils
Click for original image.

Today’s cool image to the right demonstrates that the atmosphere and climate of Mars is truly different in different places. The picture, rotated, cropped, reduced, and sharpened to post here, was taken on July 22, 2024 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). Labeled simply as a “terrain sample”, it was likely taken not as part of any specific research project but to fill a gap in the camera’s schedule in order to maintain its proper temperature.

I post it today almost to illustrate the difference between this location and the spot where the lander Insight landed on Mars. Earlier this week the MRO camera team released a short movie created by images of the lander taken over six years, showing how the dust around it had changed over time. I noted further how those images showed a very small number of dust devil tracks, which explained why no dust devil every crossed over the lander’s solar panels to clean them of dust.

For the picture on the right, however, there are a lot of dust devil tracks, so many near the bottom that they almost completely darken the ground.
» Read more

Leave a comment

Vast signs deal with SpaceX for two ISS tourist missions

12:34 pm

Depending on whether it gets NASA contractual approval, the space station startup Vast has now signed a deal with SpaceX for flying two tourist missions to ISS.

These two missions expand Vast’s launch manifest with SpaceX, which includes the company’s Falcon 9 rocket delivering Haven-1 to low-Earth orbit and a subsequent Dragon mission to fly crew to the commercial space station. Haven-1 will also be supported by Starlink laser-based high-speed internet.

Axiom, which has flown three tourist missions to ISS and has a fourth planned, is also bidding for the next two tourist slots NASA has made available for ISS in the coming years. It is not clear who will get those slots. Axiom has the advantage it has done it before, but the rumors that it lost money on those flights and now has a cash shortage work against it. Vast hasn’t yet flown, but it is moving fast to fly and occupy Haven-1 next year. NASA might want to give it at least one of those slots to balance the scales.

Hat tip to BtB’s stringer Jay.

3 comments

Firefly’s Blue Ghost lunar lander wins its fourth lunar NASA contract

9:32 am

Peregrine landing site

NASA yesterday awarded the rocket startup Firefly a $179.6 million contract to carry six NASA science instruments to the Moon on its Blue Ghost lunar lander, the third lander contract the company has won and the fourth Moon contract overall.

[The four contracts include] three lunar landers as well as one to provide radio frequency calibration services from orbit to support a radio science payload on the second lander mission.

The first mission, Blue Ghost 1 or “Ghost Riders in the Sky,” is scheduled for launch in mid-January, with a landing in the Mare Crisium region of the near side of the moon about 45 days after launch. Blue Ghost 2 will follow in 2026, landing on the lunar farside. That mission will also deploy ESA’s Lunar Pathfinder communications satellite into orbit. Both the second and third Blue Ghost missions will use Firefly’s Elytra Dark as an orbital transfer vehicle, delivering the landers to lunar orbit. Those vehicles will remain in lunar orbit to provide communications services.

This new contract will have Blue Ghost land in the Gruithuisen Domes region, as shown on the map to the right. This had been the landing target for the Astrobotic’s Peregrine lander when it launched in January 2024, but that mission failed when it developed a fuel leak shortly after launch. Astrobotic was able to operate the spacecraft through most of its trip to and from the Moon, but had to cancel the landing.

Leave a comment

ESA awards Avio three contracts worth $372 million for its Vega rockets

9:16 am

Capitalism in space: The European Space Agency (ESA) yesterday awarded the Italian rocket company Avio three different contracts worth $372 million to further develop its Vega family of rockets.

The first two contracts subsidize work on upgrading the Vega-C launch site at the French Guiana spaceport as well as developing the company’s planned new rocket, Vega-E.

The third contract is more significant, because it signals the coming end of Arianespace, ESA’s commercial arm. Instead of going through that government-run agency — as ESA has done for a quarter century — ESA simply bought a Vega-C launch from Avio directly, the first time it has obtained launch services directly from a European company. The contract is to place in orbit an ESA climate research satellite.

The end of Arianespace was further signaled today by the announcement that Arianespace’s chief executive since 2013, Stephane Israel, is stepping down. It was Israel who in 2015 discouraged ESA from making Ariane-6 reusable. It was Israel who for years poo-pooed competition and free enterprise, lobbying continuously that ESA should do its launches through Arianespace exclusively.

Now, more than a decade later, ESA has finally rejected Israel’s arguments, and is eliminating the middle-man Arianespace entirely, purchasing launch contracts directly from the rocket companies while having its member nations as well as itself encourage the development of many private rocket companies across Europe.

Leave a comment

Chinese pseudo-company launches four satellites

8:41 am

According to China’s state-run press, China early this morning successfully launched four satellites using a commercial rocket, Ceres-1, that lifted off from an off shore launch platform on the country’s northeast coast.

The rocket supposedly belongs to the pseudo-company Galactic Energy, but China’s state-run press did not think this information was important enough to mention, illustrating why I think the company is not real. The satellites were likely communications satellites intended for one of the several giant satellite constellations China is building, but that information was also left out of China’s reporting.

132 SpaceX
63 China
16 Russia
13 Rocket Lab

American private enterprise still leads the rest of the world combined in successful launches 151 to 95, while SpaceX by itself leads the entire world, including American companies, 132 to 114.

Leave a comment

Axiom to speed up assembly of its space station

6:59 pm

Axiom's new module assembly sequence
Axiom’s new module assembly sequence

Capitalism in space: In order to be able to fly its space station independent of ISS more quickly, Axiom has rearranged the order it will launch some modules.

Originally, the plan was to attach Habitat 1 (AxH1) first, before the power and thermal module. Now, the on-orbit assembly sequence will start with the Payload Power Thermal Module (AxPPTM), followed by AxH1, an airlock, Habitat 2 (AxH2), and finally the Research and Manufacturing Facility (AxRMF). “The result – free-flight capability after the launch and berthing of PPTM,” [Mark Greeley, Axiom Space COO and station program manager,] explained, “[will allow] us to add modules while on orbit once we have separated from station. Our goal is to ensure a smooth transition from a government to a commercial platform, maintaining a continuous human presence on orbit to serve a community of global customers and partners, to include NASA.”

The AxPPTM primary structure will be built by Thales Alenia Space in Turin, Italy, and then relocated to Houston no earlier than fall 2025, where the integration of the internal structure and systems will take place at Axiom Space facilities.

The new sequence is shown in the graphic above. This change will allow Axiom to fly free two years sooner than previously planned, in 2028. It appears NASA pushed for this change possibly because it considers remaining attached to ISS until 2030 a risk that should be avoided. NASA apparently is increasingly concerned about the state of Russia’s Zvezda module, and fears it might have a catastrophic failure due to the stress fractures in its hull. The sooner Axiom can get free of ISS the better.

This modification also appears to include some major changes from previous Axiom graphics. It appears the airlock module and its solar panels have undergone a major design change.

Below is my present ranking for the launch of the four space stations being designed and built:

  • Haven-1, being built by Vast, with no NASA funds. The company is moving fast, and plans to launch and occupy it in 2025 for a 30 day mission. It will then build its mult-module Haven-2 station.
  • Axiom, being built by Axiom, which has also launched three tourist flights to ISS. Though there are rumors it is experiencing cash flow issues, today’s announcement suggests those rumors might be unfounded.
  • Orbital Reef, being built by a consortium led by Blue Origin and Sierra Space. Though Blue Origin has apparently done little, Sierra Space has successfully tested its inflatable modules, including a full scale version, and appears ready to start building the station’s modules for launch.
  • Starlab, being built by a consortium led by Voyager Space, Airbus, and Northrop Grumman.
6 comments

Curiosity looks down and across Gale Crater

10:43 am

Curiosity looks down across Gale Crater
Click for original image.

Cool image time! The picture to the right, cropped, reduced, and enhanced to post here, was part of a panorama created by 24 photos taken by the right navigation camera on the Mars rover Curiosity on December 16, 2024.

The view looks west at the foothills that fill the lower slopes of Mount Sharp. In the far distance, about 20 to 30 miles away, can be seen the western rim of Gale Crater, obscured by the dust in the Martian atmosphere.

Curiosity is presently contouring west along the mountain slope. As it goes it will pass a series of canyons coming down the mountainside. The goal is to eventually reach the canyon the science team has chosen to take for climbing that mountain.

Note the rocky ground. One of the surprises found as Curiosity left the crater floor and started climbing Mount Sharp about four years ago is the rockiness of the terrain. Unlike Earth, Mars’s atmosphere and environment does not have the activity to smooth out this landscape. While science data suggests flowing water was once present here, it wasn’t here long enough to smooth things out. And the atmosphere is just too thin.
» Read more

Leave a comment

Astronomers discover 1st binary star system orbiting Milky Way’s central supermassive black hole

9:40 am

The stars orbiting Sag A*
The stars orbiting Sag A*. Click for original image.

Using infrared spectroscopic data gathered from 2005 to 2019 by the Very Large Telescope in Chile, astronomers have identified the first known binary star system to orbit Sagittarius A* (pronounced “A-star”), the Milky Way’s central supermassive black hole.

You can read their science paper here [pdf]. The white dot at the center of the map to the right marks the location of Sagittarius A*, while the red dot marks the present location of the binary star, dubbed D9. The other objects are the stars previously identified orbiting the central black hole, all of which are now believed to be single stars. The binary D9 has an estimated orbit around Sagittarius A* of 432 years and is thought to be less than three million years old. The two stars have approximate masses of 3.86 and 2.8 solar masses, with the smaller orbiting the larger every 372 days.

There is a lot of uncertainty in these numbers, but the data identifying the binary is quite firm. This discovery, as well as the many other stars now known to orbit Sagittarius A*, show that star formation so close to a supermassive black hole is not only possible, it is common, something astronomers a decade ago thought impossible.

4 comments

New manned Dragon capsule forces NASA to shuffle ISS crew launch and return schedules

9:03 am

In order to give SpaceX more time to complete work on a new manned Dragon capsule, raising its fleet of capsules to five, NASA has shuffled its springtime ISS crew launch and return schedules.

The change gives NASA and SpaceX teams time to complete processing on a new Dragon spacecraft for the mission. The new spacecraft is set to arrive to the company’s processing facility in Florida in early January. “Fabrication, assembly, testing, and final integration of a new spacecraft is a painstaking endeavor that requires great attention to detail,” said Steve Stich, manager, NASA’s Commercial Crew Program.

…NASA and SpaceX assessed various options for managing the next crewed handover, including using another Dragon spacecraft and manifest adjustments. After careful consideration, the team determined that launching Crew-10 in late March, following completion of the new Dragon spacecraft, was the best option for meeting NASA’s requirements and achieving space station objectives for 2025.

This decision however impacts the return of the Dragon crew presently on board ISS, including the two astronauts launched in June on Boeing’s Starliner capsule and whose stay was extended from its initial length of one-to-eight weeks to more than six months when NASA made the decision to bring Starliner home unmanned. Instead of returning in February 2024, that crew will now have to return after the next crew arrives in late March.

Most of the press has focused on this two month extension to the Starliner crew, but to me the real news is that SpaceX is building a fifth manned capsule, as yet unnamed. Having five reusable capsules will give the company greater flexibility. I suspect SpaceX decided to build this additional capsule because, in addition to its ISS missions for NASA, it is going to be flying in 2025 both an Axiom mission to ISS as well as a 30-day mission to Vast’s Haven-1 space station. That latter mission will tie up one manned capsule for many months both before and after that long flight.

6 comments

Second launch attempt by Japanese rocket startup fails about 90 seconds after liftoff

1:11 am

Japanese spaceports
Japanese spaceports

The second orbital launch attempt by Japanese rocket startup Space One of its Kairos rocket failed about 90 seconds after liftoff when the rocket started to spiral out of control and mission controllers were forced to destroy it.

The link above starts just before launch. You can see the rocket begin to fly out of control, and start spiraling. Shortly thereafter it disappears from view.

The map to the right shows the location in Japan of its private launch facility, dubbed Spaceport Kii. The spaceport of Japan’s space agency JAXA, where all of the country’s previous launches have taken place, is at Tanegashima on a island in the south of Japan.

Space One’s first orbital attempt failed in March when the rocket blew up mere seconds after lift-off.

The company has some major Japanese investors, including Canon Electronics and Mitsubishi, so I would expect it will have the finances to try again.

One comment

Using a new first stage booster, SpaceX launches two communications satellites

7:16 pm

In what has become a rare event, SpaceX today used a brand new first stage to successfully place two SES communications satellites into orbit, its Falcon 9 rocket lifting off from Kennedy in Florida.

The first stage landed safely on a drone ship in the Atlantic. The two fairing halves completed their second and twenty-second flights respectively.

The leaders in the 2024 launch race:

131 SpaceX
62 China
16 Russia
13 Rocket Lab

American private enterprise still leads the rest of the world combined in successful launches 150 to 94, while SpaceX by itself leads the entire world, including American companies, 131 to 113.

One comment

Ranking the four private space stations under construction

10:18 am

the proposed Starlab space station
the proposed Starlab space station

Yesterday NASA posted an update on the development of Starlab, one of the four private space stations under development or construction, with three getting some development money from NASA. According to that report, the station had successfully completed “four key developmental milestones, marking substantial progress in the station’s design and operational readiness.”

As is usual for NASA press releases, the goal of this announcement was to tout the wonderful progress the Starlab consortium — led by Voyager Space, Airbus, and Northrop Grumman — is making in building the station.

“These milestone achievements are great indicators to reflect Starlab’s commitment to the continued efforts and advancements of their commercial destination,” said Angela Hart, program manager for NASA’s Commercial Low Earth Orbit Development Program. “As we look forward to the future of low Earth orbit, every successful milestone is one step closer to creating a dynamic and robust commercialized low Earth orbit.”

I read this release and came to a completely opposite conclusion. » Read more

14 comments

Starlink revenue in 2025 now projected to be $11.8 billion

9:38 am

Capitalism in space: According to one industry market research firm, SpaceX is expected to earn $11.8 billion in revenue in 2025 from its Starlink satellite constellation, a gigantic increase from its estimate for 2024.

SpaceX’s satellite internet service Starlink is projected to reach $11.8 billion in revenue next year, driven by strong consumer demand and growing U.S. military contracts, according to a new market analysis. The forecast, released by the market research firm Quilty Space, represents a substantial increase from the estimated $7.7 billion in revenue for 2024, highlighting Starlink’s rapid growth trajectory in the satellite communications market.

The rise in revenue has been fueled by two factors, the growth in consumer subscribers to the system, and the addition of Space Force contracts that use SpaceX Starshield version of its Starlink satellites.

These numbers are quite spectacular. In the past seven years SpaceX had raised about $12 billion in private investment capital to build both its Starlink constellation and its Starship/Superheavy rocket. Starlink now produces that amount of money for the company each year.

In other words, SpaceX no longer needs NASA as a customer. It has the resources to complete development of Starship, in all its iterations, without any government help. If it wishes to funnel some of this income back into Starship and Superheavy to launch its own missions to Mars, it can.

Leave a comment

New computer simulations suggest Saturn’s rings are not young but formed at the same time as the solar system

9:12 am

A bright spot in Saturn's rings
Click for original source.

The uncertainty of science: Scientists doing computer simulations now posit that Saturn’s rings are not young, between 100 to 400 million years old as has been believed for the last few decades, but formed instead when Saturn formed, 4.6 billion years ago.

You can read their paper here [pdf].

The young age had been based on data from the Cassini orbiter, which showed the ring particles to be very bright and clean. If old those particles would have been darker as they accumulated dust over time on their surface. The new computer simulations suggest a process whereby those particles get “cleaned,” thus making it possible for the rings to be very old, possibly as old as Saturn itself.

Must I point out the uncertainties? The paper itself admits in its abstract “uncertainties in our models that assume no porosity, strength, or ring particle granularity.” Seems these assumptions make the conclusions very uncertain indeed.

Then again, the previous young estimates of the age of the rings had many similar assumptions and uncertainties. Essentially, we don’t have enough information to make any definitive determinations.

One comment

T-Mobile initiates direct-cell-to-satellite texting using Starlink

8:50 am

As expected after the most recent Starlink launch, T-Mobile has now begun offering its customers beta registration for using Starlink satellites for texting in areas where no cell towers exist.

The free beta program is available to all T-Mobile customers with compatible devices and postpaid voice plans, the telco announced Dec. 16, although first responders will receive priority access due to limited initial capacity. The company declined to detail capacity and device restrictions but said the beta program would gradually expand to more devices via software updates. “Spots are limited but the service will be available in most areas and most of the time,” a T-Mobile spokesperson said.

The goal right now is to test the system and get user feedback.

Leave a comment

China and SpaceX complete launches

11:21 pm

Two launches today. First China launched four Earth observation radar satellites, its Long March 2D rocket lifting off from its Taiyuan spaceport in northeast China. No word where the rocket’s lower stages, using very toxic hypergolic fuels, crashed within China.

SpaceX then launched a GPS-type satellite for the Space Force, its Falcon 9 rocket lifting off from Cape Canaveral. Little was released about the payload and what information was released was not very informative. The first stage completed its fourth flight, landing softly on a drone ship in the Atlantic.

The leaders in the 2024 launch race:

130 SpaceX
62 China
16 Russia
13 Rocket Lab

American private enterprise still leads the rest of the world combined in successful launches 149 to 94, while SpaceX by itself leads the entire world, including American companies, 130 to 113.

Leave a comment

A galactic eye in heaven

12:30 pm

A galactic eye in space
Click for original image.

Cool image time! The picture to the right, reduced and sharpened to post here, was taken by the Hubble Space Telescope as part of a project to study the star formation processes over time in this galaxy, located about 76 million light years away.

A prominent bar of stars stretches across the centre of this galaxy, and spiral arms emerge from each end of the bar. Because NGC 2566 appears tilted from our perspective, its disc takes on an almond shape, giving the galaxy the appearance of a cosmic eye.

As NGC 2566 gazes at us, astronomers gaze right back, using Hubble to survey the galaxy’s star clusters and star-forming regions. The Hubble data are especially valuable for studying stars that are just a few million years old; these stars are bright at the ultraviolet and visible wavelengths to which Hubble is sensitive. Using these data, researchers will measure the ages of NGC 2566’s stars, helping to piece together the timeline of the galaxy’s star formation and the exchange of gas between star-forming clouds and stars themselves.

To get the full picture, astronomers have also obtained infrared data from the Webb Space Telescope and millimeter/submillimeter radio wavelength data from the ALMA telescope.

One comment

The Insight lander on Mars as seen from orbit over six years

12:07 pm

Insight as seen by MRO over six years
Click for movie.

Using photos taken by Mars Reconnaissance Orbiter (MRO) from 2018 to 2024, researchers have compiled a short movie showing how the dust around the Mars lander Insight changed over time.

This video shows images taken by HiRISE between Dec. 11, 2018, just a couple weeks after InSight landed on Mars, and Oct. 23, 2024. In the images, InSight often appears as a bright, blue dot due to its reflection of sunlight. A dark halo was scorched into the ground by the spacecraft’s retrorocket thrusters; this halo fades away over time. Dark stripes that can be seen on the surface are tracks left by passing dust devils. [emphasis mine]

You can see the movie here. The image to the right was the first picture taken by MRO only three weeks after landing.

Insight eventually shut down because this dust accumulated on its solar panels, and the lander never was blessed with having a dust devil cross over it to blow that dust away. This video illustrates why. Out of the seven images making up the short movie, only three show dust devil tracks, and in each case only a few tracks are seen. No other tracks are detected.

In other words, over six years this region simply did not get a lot of dust devils. The odds of one crossing over InSight was thus quite low. Ironically, the image to the right shows that a dust devil crossed very close to the lander about the time it landed in 2018, probably just beforehand since the dark scorch created by the lander’s thrusters cover the track. No dust devil ever got that close again.

One comment

Another American rocket startup gets a multi-launch contract

10:25 am

The American rocket startup Vaya Space announced today that it has been awarded a multi-launch contract to use its proposed Dauntless rocket to place up to 250 small satellites in orbit for the satellite startup Space Telecommunications.

Vaya has been around since 2017, has won contracts with the Air Force in connection with developing its hybrid-solid-fueled rocket, and in 2022 completed a test suborbital launch. It hopes to launch Dauntless for the first time in 2026.

This contract is probably like most launch contracts awarded to rocket startups. It allows the company to claim progress, while giving the satellite company the right to go elsewhere at no cost should the rocket not launch on time.

Leave a comment

Ispace awarded $5.83 million loan from Japanese government

10:01 am

Ispace landing map

The planetary lander startup Ispace today announced that it has been awarded a $5.83 million loan from the Japan Finance Corporation, a government corporation designed to issue loans to encourage Japanese businesses.

The money will be issued this month, and Ispace will have ten years to pay it back. Depending on whether the company is profitable or not, the interest rate will be either 0.5% or 4.15%.

Ispace’s one lunar landing attempt so far, Hakuto-R1, was a failure when its software thought it was close to the ground at three miles altitude and shut off its engines. The company however is going to try again, with the launch of its second lander, dubbed Resilience, scheduled for a January 2025 launch. It will also carry the company’s own Tenacious micro-rover, and will hopefully land as shown in the map to the right, in the north of the Moon’s near side.

Leave a comment

China launches first set of satellites for planned internet megaconstellations

9:42 am

China today successfully launched an unknown number of satellites in the first launch of one of its planned internet megaconstellations designed to compete with Starlink, its Long March 5B rocket lifting off from its coastal Wenchang spaceport.

Not revealing the number of satellites launched is probably a violation of the Outer Space Treaty, which requires each signatory to inform others of its launches and at a minimum the number of objects placed in orbit. This constellation, dubbed Guowang, is hoping to launch as many as 13,000 satellites, and that will require some coordination to prevent it from interfering with the constellations launched by others. Not revealing the size of this satellite group makes such coordination impossible.

In a bit of good news, it appears China has solved the problem of its Long March 5B rocket, which in the past had used its core stage to place objects in orbit. After payload deployment that core stage would be in an unstable an orbit that would quickly decay, allowing the stage to crash uncontrolled, thus threatening habitable areas worldwide. The rocket’s new upper stage now takes the payloads into orbit, so the core stage can drop off sooner and fall into the ocean harmlessly.

The leaders in the 2024 launch race:

129 SpaceX
61 China
16 Russia
13 Rocket Lab

American private enterprise still leads the rest of the world combined in successful launches 148 to 93, while SpaceX by itself leads the entire world, including American companies, 129 to 112.

Leave a comment

Boeing to take more than a decade to refit two 747s for Air Force One

7:30 pm

Utter incompetence: According to recent news reports, Boeing will not be able to deliver the two 747s it is refitting to be the president’s Air Force One fleet until 2029, even though it signed a $3.9 billion contract to do so in 2018.

The delay is startling given that Boeing isn’t building the planes from scratch. During Trump’s first term, Boeing started to overhaul two 747s that were built for a Russian airline that never took the jets.

This is more than absurd, it is obscene. Boeing is handed two flightworthy 747s and almost $4 billion, and it can’t refit the two planes in less than a decade? It seems one of the first things Trump should do once he returns to office next month is cancel this contract entirely, demand a refund from Boeing, and simply convert his present fleet of “Trump Force One” airplanes that he has been using since 2020 for use as president. Cheaper, faster, and certainly a wiser use of taxpayer money.

As for Boeing, this story illustrates once again how far this company has fallen. Remember, it was Boeing that conceived, designed, and built the 747. Moreover, its 747 has been used for decades for Air Force One. For its engineers now to be incapable to refitting another two 747s for this purpose seems inconceivable, and suggests those same engineers should not be trusted on any new planes they build.

22 comments

Juno spots changes on Io’s surface in just a two-month span

10:57 am

Before and after images by Juno of volcanic ring on Io
Click for original image.

New photos taken just two months apart by Juno of a region dubbed Nusk Patera on the Jupiter moon Io showed the appearance of a distinct ring that had hardly been there before.

The pictures, taken during two recent fly-bys of the moon, are above, and show the change. From the caption:

A red ring formed around Nusku Patera in the two months between the spacecraft’s 58th flyby on Feb. 3, 2024, and its 60th on April 9, 2024. The ring obscures some nearby features like Creidne Patera. This ring, 683 miles (1,100 kilometers) wide is likely from a Pele-type plume rich in sulfur. Similar transient red rings were observed by NASA’s Galileo mission around Grian Patera and Surt and were associated with intense but short-lived thermal “outburst” eruptions.

In other words, sulfur from eruption from the central vent/caldera was flung into the sky enough that when it eventually settled back down it landed in a ring about 340 miles away from the center.

Other data from Juno, also released this week here and here, detected fresh lava flows at another volcanic region of Io dubbed, Zal Patera.

Leave a comment

SpaceX launches more Starlink satellites

9:39 pm

SpaceX today successfully launched 22 Starlink satellites, 13 of which were for its direct-to-cell constellation. The Falcon 9 rocket lifted off from Vandenberg in California, its first stage completing its ninth flight by landing successfully on a drone ship in the Pacific.

According to a tweet by SpaceX at the end of October, only five more launches were necessary to complete the first version of its direct-to-cell Starlink constellation. Today’s launch meets that criteria. Since the FCC has approved the constellation’s license, this means T-Mobile can start offering the service to customers, filling in all dead spots worldwide.

What makes this launch even more unique is that for the first time in quite awhile there was a four-day-plus gap between SpaceX launches. The company has been launching so often that it has been rare for more than two days to pass this year without a launch.

The leaders in the 2024 launch race:

129 SpaceX
60 China
16 Russia
13 Rocket Lab

American private enterprise now leads the rest of the world combined in successful launches 148 to 92, while SpaceX by itself leads the entire world, including American companies, 129 to 111.

One comment

Perseverance reaches top of Jezero Crater rim

1:41 pm

The view west out of Jezero Crater
Click for high resolution panorama. For original images, go here and here.

Overview map
Click for interactive map.

After spending more than three and a half years exploring the floor of Jezero Crater, the rover Perseverance has finally reached the top of the crater’s western rim, and is about to begin exploring the mountainous and potentially rich mining region to the west.

The panorama above, created from two pictures taken by Perseverance’s right navigation camera on December 11, 2024 (here and here), has been cropped, reduced, enhanced, and annotated to post here. It looks west into that mountainous region, with the yellow lines on the overview map to the right indicating the approximate view. The blue dot on that map marks Perseverance’s present position, on top of Lookout Hill, the name the rover team has given to that spot on the rim.

The low resolution of the region beyond the grey strip is unexplained. For some reason the rover team has not yet updated the interactive map showing Perseverance’s travels with the many high resolution pictures that Mars Reconnaissance Orbiter (MRO) has taken of this region, in anticipation of Perseverance’s travels there. I expect however this will change shortly.

Witch Hazel Hill is the first target beyond the rim, where there is an outcrop 330-feet-high with many layers. The rover will then head downhill and south to check out a spot that the scientists believe might show features existing from before Jezero Crater was formed. The rover will then head back up to the rim further south to look at an outcrop of blocks that might actually be ejecta from another much larger Martian impact.

These blocks may represent ancient bedrock broken up during the Isidis impact, a planet-altering event that likely excavated deep into the Martian crust as it created an impact basin some 745 miles (1,200 kilometers) wide, 3.9 billion years in the past.

Jezero sits on the northwestern rim of Isidis.

Leave a comment
1 … 16 17 18 19 20 … 499