Category: Behind The Black

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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October 1, 2024 Quick space links

3:29 pm

Courtesy of BtB’s stringer Jay. This post is also an open thread. I welcome my readers to post any comments or additional links relating to any space issues, even if unrelated to the links below.

 

 

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Busy cooking

3:20 pm

I have not posted this afternoon because I am cooking my quarterly batch of tomato meat sauce, as per my mother’s recipe that was handed to her from our Italian-Jewish relatives. Time consuming, but I get enough frozen to last for at least three months.

One of my readers requested I share the recipe, so here it is. The quantites below are for making a large batch, 9 meals for two (splitting a meatball), and an additional uncounted number of pasta dishes (meat ravioli, spaghetti, rigatoni, etc). Usually lasts Diane and I about three months.

Ma Zimmerman’s spaghetti sauce
» Read more

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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.

2 comments

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.

7 comments

September 30, 2024 Quick space links

4:39 pm

Courtesy of BtB’s stringer Jay. This post is also an open thread. I welcome my readers to post any comments or additional links relating to any space issues, even if unrelated to the links below.

 

 

 

 

 

7 comments

Course carnage at Harvard as more than 30 queer and Marxist classes get axed

12:39 pm

Harvard: where you get can get a shoddy education centered on hate and bigotry
Harvard: where you can spend a lot of money
and still get a shoddy education

It appears the student body at Harvard is beginning to realize that classes focused on the queer agenda or racist Marxist indoctrination will not teach you much of substance and could even hurt your future career, and are thus increasingly not signing up for these courses.

This fall more than 30 such courses at Harvard have been cancelled, with the History and Literature department losing the most.

According to The Crimson, Hist-Lit Director of Studies Lauren Kaminsky said class offerings dropped from 19 to 13 classes after five lecturers either departed or chose to do something else. The canceled Hist-Lit courses include “British Soft Power from Shakespeare to Dua Lipa,” “Marx at the Mall: Consumer Culture & Its Critics,” “Global Transgender Histories,” “Indigenous Genders and Sexualities in North America,” “The Making of Race across Latin America,” and “Global Histories of Capitalism.”

The course description for “Global Transgender Histories” noted students “will become familiar with some of the global vocabulary of gender identities beyond the binary and will understand the historical impacts of phenomena such as racism, imperialism, and [the] medicalization on gender identities.” Students also would’ve “discovered” the diversity of “gender-variant people” via “religious texts, poetry, art, legal cases, travelogues, newspapers, films […] and oral histories.”

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