Year: 2022

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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Groucho Marx & Marilyn Monroe – Love Happy

6:01 pm

An evening pause: This short clip starts with audio from a Groucho Marx interview where he describes the audition for the part of a girl in a short scene from the 1949 film Love Happy, and concludes by showing the scene as filmed, with Marilyn Monroe playing the part. Entertaining, and a fascinating bit of film trivia.

Hat tip Alton Blevins.

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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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The Ukrainian War: After Six Months

1:11 pm

The Ukraine War as of May 5, 2022
The Ukraine War as of June 6, 2022. Click for full map.

The Ukraine War as of August 30, 2022
The Ukraine War as of August 30, 2022. Click for full map.

It is now more than three months since my June update on the war in the Ukraine. It is also six months since Russia first invaded.

No new updates were necessary because little had changed, as indicated by the two maps to the right, adapted from maps created by the Institute for the Study of War (ISW). For their full interactive version go here.

On both maps red indicates territory controlled by Russia, light pink areas that Russia only tentatively controlled, light blue areas recovered by the Ukraine from Russia, and blue-striped areas regions of documented Ukrainian resistance within Russian-controlled territories. The red-striped regions were regions grabbed by Russia during its 2014 invasion.

The top map is from ISW’s June 6th assessment. The bottom map comes from its August 28th assessment.

Though I don’t solely rely on ISW for information (it tends to favor the Ukraine in most of its analysis), its maps have repeatedly appeared reliable and accurate, which is why I use them here.

As you can see, in three months not much has changed. Russia continues to grind away in the middle regions, gaining territory slowly but steadily. The Ukraine meanwhile has either stopped any further Russian advance in the north or south, or has chipped away slightly at Russian holdings in these regions.
» Read more

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Today’s blacklisted American: Post Office forces Christian worker to quit rather than work on Sunday

11:57 am

Gerald Groff, blacklisted by the post office
Gerald Groff, blacklisted by the post office

They’re coming for you next: Because the U.S. Post Office refused to honor mailman Gerald Groff’s desire to observe the Christian Sabbath of Sunday, he was forced to quit, even though numerous civil rights laws were specifically written to require businesses and government agencies like the post office to accommodate his religious beliefs.

He began his career with the USPS in 2012 in Lancaster County, Pennsylvania, as a mail carrier. When the postal service began delivering packages on Sundays for Amazon, Gerald asked for a religious accommodation, which is protected under federal law. The postmaster granted his request, and as part of the accommodation, Gerald agreed to work extra shifts during the week. He even switched posts and accepted a lower position in order to be able to abide by his beliefs.

After initially honoring Gerald’s accommodation, the USPS changed position and started scheduling him to work Sundays. Being forced to choose between his faith and his job, Gerald sued the USPS for trampling on his First Amendment rights and violating federal law.

» Read more

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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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