Tag: spaceflight

Orbital tug startup Impulse Space raises $150 million

9:12 am

The orbital tug startup Impulse Space announced yesterday that it has raised $150 million in private investment capital, money it will use to develop its planned two tugs, dubbed Mira and Helios.

So far the company, founded by former SpaceX engineer Tom Mueller, has only flown one mission, a demo mission of Mira last year that had some communications and software problems but was still declared a success.

Both Mira and Helios use chemical propulsion systems that offer large amounts of delta-v, or change in velocity, that can be provided quickly. Impulse said when it announced Helios that the vehicle could take a five-ton satellite from low Earth orbit to geostationary orbit in less than a day.

It hopes to fly an upgraded version of Mira late next year, and the first Helios mission in 2026.

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Carbon dioxide and hydrogen peroxide found on the surface of Pluto’s moon Charon

9:03 am

Using spectroscopic data from the Webb Space Telescope, scientists have detected both carbon dioxide and hydrogen peroxide on the surface of Pluto’s moon Charon, adding these chemicals to the previously detected water ice and ammonia-bearing chemicals that give the planet its gray and red colors.

The team compared the spectroscopic observations with laboratory measurements and detailed spectral models of the surface, concluding that carbon dioxide is present primarily as a surface veneer on a water ice-rich subsurface. “Our preferred interpretation is that the upper layer of carbon dioxide originates from the interior and has been exposed to the surface through cratering events. Carbon dioxide is known to be present in regions of the protoplanetary disk from which the Pluto system formed,” Protopapa said.

The presence of hydrogen peroxide on the surface of Charon clearly indicates that the water ice-rich surface is altered by solar ultraviolet light and energetic particles from the solar wind and galactic cosmic rays. Hydrogen peroxide forms from oxygen and hydrogen atoms originating from the breakup of water ice due to incoming ions, electrons or photons.

The theory proposing the dry ice comes from the interior is interesting, but there simply is not enough data to take it very seriously at this point.

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Russia delays first launch of new Soyuz-5 rocket to 2026

8:52 am

According to Russia’s state-run press, the first launch of its new Soyuz-5 rocket will not occur in 2025 as previously predicted, but has been delayed to 2026.

No reason for the delay was given, but I suspect it is because Russia has still been unable to negotiate a deal with Kazakhstan for the use of the planned launchpad at Baikonur. In 2023 Kazakhstan seized control of the Soyuz-5 launchpad, and has apparently so far refused to agree to a new deal for allowing Russia to use it.

These negotiating delays with Kazakhstan are not the Soyuz-5 rocket’s only issues. Russia first announced the rocket in 2015, with its first launch planned for 2022. Thus, long before Kazakhstan retook its launchpad in 2023 the project was behind schedule. Other plans in 2019 to launch it from the former commercial Sea Launch platform that Russia took over have come to nothing.

Kazakhstan’s unwillingness to negotiate almost certainly stems from Russia’s invasion of the Ukraine. It now fears Russia, and is very reluctant to give it more control of Kazakhstan’s assets.

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Engineers shut down one science instrument on Voyager-2 to conserve power

8:38 am

In order to keep the spacecraft functioning as its nuclear power source dwindles, engineers have now shut down one of Voyager-2’s operating science instruments in order to keep four instruments operating.

Mission engineers at NASA have turned off the plasma science instrument aboard the Voyager 2 spacecraft due to the probe’s gradually shrinking electrical power supply.

Traveling more than 12.8 billion miles (20.5 billion kilometers) from Earth, the spacecraft continues to use four science instruments to study the region outside our heliosphere, the protective bubble of particles and magnetic fields created by the Sun. The probe has enough power to continue exploring this region with at least one operational science instrument into the 2030s. [emphasis mine]

The highlighted sentence is the first time I have ever seen any prediction for the life of Voyager-2 to extend past 2030. Previously, project engineers have consistently stated that the power would run down sometime around 2026. This extension suggests the decision has been made to do whatever can be done to keep the spacecraft functioning for as long as possible, not so much to do science but to test the limits of its engineering. To do so, they will step-by-step shut down instruments rather than keep them all going.

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Astronomers detect exoplanet half as massive as the Earth around second closest star system

11:28 am

Using the Very Large Telescope (VLT) in Chile, astronomers have detected evidence of an exoplanet about half as massive as the Earth orbiting Barnard’s Star, only six light years away and the second closest star system.

Barnard’s Star is a prime target in the search for exoplanets due to its proximity and its status as a red dwarf, a common type of star where low-mass planets are often found. Despite a promising signal detected in 2018, no planet had been definitively confirmed around it until now. The ESPRESSO spectrograph [on VLT] … enabled the astronomers to detect Barnard b, a subterrestrial planet that orbits the star in 3.15 days. The team also identified signals indicating the possible presence of three other candidate exoplanets, which have yet to be confirmed.

Back in the 1960s using the less precise instruments of the time, astronomers thought they had detected an exoplanet orbiting Barnard’s Star. That detection however proved false. The detection is real, however, and adds weight to the growing evidence that planets can form around red dwarf stars, the most common stars in the universe with the longest lifespan, predicted to be many tens of billions of years. Having planets around such stars significantly increases the chances of habitable planets, even if those planets do not harbor life of its own.

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Gogo buys competitor Satcom Direct

9:53 am

Gogo, which provides internet access for business jets, has now purchased its main competitor Satcom Direct, in order to provide a service that can better compete with Starlink.

Satcom Direct would get $375 million in cash and five million shares from Gogo under a deal announced Sept. 30, subject to regulatory approvals, and up to $225 million in extra payments tied to performance targets over the next four years, suggesting around $636 million in maximum total proceeds.

Gogo has historically dominated the small and midsize part of the business aviation market and connects about 7,000 planes, according to William Blair analyst Louie DiPalma, while Satcom Direct has a commanding market share for long-haul.

Combined, William Blair estimates the companies are providing Wi-Fi to around 8,200 of the 9,200 business jets that currently have connectivity — or nearly 90% of the market.

Gogo’s share price has dropped 70% since 2022 in the face of Starlink’s recent signing of numerous airline companies. The stock market obviously thinks Starlink is eventually going to capture the business jet customer as well. This deal will possibly allow Gogo to compete more effectively.

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Data from two different studies suggest Betelgeuse has a Sun-sized companion star

9:46 am

Betelqeuse
An optical image of Betelgeuse taken in 2017 by a ground-based
telescope, showing its not unusual aspherical shape.
Click for original image.

Two different independent studies have uncovered evidence that the red giant star Betalgeuse likely has an unseen companion star about the mass of the Sun and orbiting it every six years.

MacLeod and colleagues linked a six-year cycle of Betelgeuse brightening and dimming to a companion star tweaking its orbit, in a paper submitted to arXiv.org September 17. MacLeod examined global, historical measurements dating back to 1896.

Separately, Jared Goldberg of the Flatiron Institute in New York and colleagues used the last 20-odd years of measurements of Betelgeuse’s motion on the sky, which have the highest precision. That team also found evidence of a companion nudging the bigger star, submitted to arXiv.org August 17.

Previous observers noticed Betelgeuse’s light varying on a roughly six-year cycle. In 1908, English astronomer Henry Cozier Plummer suggested the cycle could be from the gravity of a companion star tugging Betelgeuse back and forth.

You can download the two papers here and here. This quote from the first paper’s abstract not only explains why the star has not been detected previously, but suggests its doomed future:

The companion star would be nearly twenty times less massive and a million times fainter than Betelgeuse, with similar effective temperature, effectively hiding it in plain sight near one of the best-studied stars in the night sky. The astrometric data favor an edge-on binary with orbital plane aligned with Betelgeuse’s measured spin axis. Tidal spin-orbit interaction drains angular momentum from the orbit and spins up Betelgeuse, explaining the spin–orbit alignment and Betelgeuse’s anomalously rapid spin. In the future, the orbit will decay until the companion is swallowed by Betelgeuse in the next 10,000 years. [emphasis mine]

The presence and future capture of this small companion star will help astronomers better calculate future fluctuations of Betelgesue itself. That capture is also going to occur relatively soon, on astronomical time scales.

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During fly-by Juice snaps picture of Earth’s radiation belts

9:32 am

Juice image of Earth's radiation belts
Click for original graphic.

During its fly-by of Earth on August 19-20, the European Jupiter orbiter Juice used its NASA instruments, designed to study the radiation environment around the gas giant, to snap a false color image of the Earth’s radiation belts, as shown in the graphic to the right. From the caption:

On Aug. 19, JENI and its companion particle instrument Jovian Energetic Electrons (JoEE) made the most of their brief 30-minute encounter with the Moon. As Juice zoomed just 465 miles (750 kilometers) above the lunar surface, the instruments gathered data on the space environment’s interaction with our nearest celestial companion. It’s an interaction scientists expect to see magnified at Jupiter’s moons, as the gas giant’s radiation-rich magnetosphere barrels over them.

On Aug. 20, Juice hurled into Earth’s magnetosphere, passing some 37,000 miles (60,000 km) above the Pacific Ocean, where the instruments got their first taste of the harsh environment that awaits at Jupiter. Racing through the magnetotail, JoEE and JENI encountered the dense, lower-energy plasma characteristic of this region before plunging into the heart of the radiation belts. There, the instruments measured the million-degree plasma encircling Earth to investigate the secrets of plasma heating that are known to fuel dramatic phenomena in planetary magnetospheres.

The dotted line shows the trajectory of ESA’s Juice spacecraft during its lunar-Earth gravity assist, with the white rings indicating equatorial distances of 4 and 6 Earth radii. The colors indicate the strength of the energetic neutral atoms detected by the instruments, and show the million-degree hot plasma halo that circles the Earth.

The data proved that the instruments are functioning as intended, and will thus be able to achieve their main goal, studying the much more active and energetic radiation belts of Jupiter.

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FAA grounds SpaceX again

9:10 am

According to a report in Reuters, the FAA yesterday announced that it has grounded SpaceX from any further launches, two days after SpaceX had already paused launches, the action triggered when the second stage of Saturday’s Falcon 9 launch to ISS failed to fire its de-orbit burn properly, thus causing the stage to splashdown outside its target zone in the Pacific.

This action is a perfect example of the FAA’s extraneous interference. SpaceX was already on the case. It doesn’t need the FAA to kibbitz it, since no one at the FAA has any qualifications for providing any useful advice. All the FAA accomplishes here is get in the way.

The FAA’s action also likely falls outside its statutory authority. The stage landed in the ocean, causing no damage or threat to public safety, the only areas the FAA’s authority resides. And if the agency now deems returning equipment part of its licensing requirements, why did it didn’t say anything about the uncertain nature of the return of Boeing’s Starliner capsule, which targeted a landing on land and could have easily ended up crashing in the wrong spot because its own thrusters were untrustworthy?

The FAA is playing favorites here, and needs to be reined in, badly.

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Perseverance looks uphill

9:51 am

Perseverance looks uphill
Click for full resolution. The original images can be found here and here.

Cool image time! The panorama above was created by me from two pictures taken today by the left navigation camera on the Mars rover Perseverance (found here and here). The haziness in the air is the left over from a local dust storm in Jezero Crater during the past month.

On the overview map below, the blue dot marks Perseverance’s present position, with the red dotted line indicating the approximate planned route of the rover uphill. The yellow lines are my guess as to the area covered by the panorama above. That guess could be wrong, as not all the features in the picture match the overview map. The view could be much closer, with the hill and ridgeline nothing more than the small outcrops close to the rover.

Nonetheless, these navigation pictures show us the kind of terrain the rover will be climbing as it works its way up the rim of Jezero Crater. The ground is relative smooth, though steep. My guess is that this is about a 25% grade, which on Earth would be a problem but on Mars it is a grade that NASA’s other rover, Curiosity, has routinely traversed. Perseverance has not yet traveled this kind of steepness, but there is no reason to expect it to have any difficulties doing so.

Overview map
Click for interactive map.

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Curiosity spots a corroded weathered rock

9:15 am

a weathered and corroded rock
Click for original image.

Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken on September 29, 2024 by the close-up camera mounted at the end of the robot arm of the rover Curiosity on Mars.

This is a small rock, less than three inches across. It is embedded in the sand and soil of Mars, its surface clearly weathered and smoothed by some process. The holes and gaps in the rock could have occurred prior to that smoothing, getting exposed by it. Or possibly the holes developed during the smoothing, with sections breaking off because the material was like sandstone, easily friable.

What caused the smoothing? The data from Curiosity as it climbs Mount Sharp suggests some water process, either flowing water or glacial ice. The scientists at present tend to prefer the liquid explanation, but that requires the Martian atmosphere to have once been much thicker and warmer, conditions that no model has yet demonstrated convincingly was ever possible.

The rock is also likely another example of sulfur, part of the sulfate-bearing unit of geology that Curiosity is presently traversing.

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Proposed commercial spaceport in Azores launches two suborbital demonstration rockets

8:38 am

Santa Maria spaceport

A spaceport startup, the Atlantic Spaceport Consortium (ASC), has successfully launched two small suborbital demonstration rockets from the island of Santa Maria in the Azores of Portugal, where it hopes to eventually establish a spaceport.

The first of the two flights was launched from a mobile platform at 13:04 UTC on 27 September. The rocket reached an altitude of 5,596 metres. The second was launched at 11:49 UTC on 28 September 2024. According to the company, the second launch ‘was not perfect,’ but it did not provide any further details on what occurred during the flight.

The rocket was developed and built by ASC, and was intended to demonstrate its own rocket capabilities as well as provide information to the Portuguese government for establishing its own regulatory guidelines, as per an agreement signed in August.

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