Year: 2019

Bennu & Ryugu: Two very old and strange asteroids

5:35 pm

Bennu as seen by OSIRIS-REx
Bennu’s equatorial ridge. Click for full image.

This week the science team operating the OSIRIS-REx spacecraft at the asteroid Bennu hosted a joint conference in Tucson, Arizona, with the scientists operating the Hayabusa-2 spacecraft at the asteroid Ryugu. Both gave up-to-date reports on the science so far obtained, as well as outlined upcoming events. I was fortunate enough to attend.

First an overview. Both Bennu and Ryugu are near earth asteroids, with Bennu having an orbit that might even have it hit the Earth in the last quarter of 2100s. Both are very dark, and are rubble piles. Both were thought to be of the carbonaceous chondrite family of asteroids, sometimes referred to as C-type asteroids. This family, making up about 75% of all asteroids, includes a bewildering collection of subtypes (B-types, F-types, G-types, CI, CM, CV, CH, CB, etc), all of which were initially thought to hold a lot of carbon. We now know that only a few of these categories, the CI and CM for example, are carbon rich.

Even so, we actually know very little about these types of asteroids. They are very fragile, so that any that reach the Earth’s surface are not a good selection of what exists. About 90% of the material gets destroyed in the atmosphere, with the remnant generally coming from the innermost core or more robust nodules. We therefore have a biased and limited sample.

It is therefore not surprising that the scientists are finding that neither Bennu nor Ryugu resembles anything else they have ever seen. Both have aspects that resemble certain types of carbonaceous chondrite asteroids, but neither provides a very good fit for anything.
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Watch the Mercury transit of the Sun from home!

3:33 pm

The November 11 transit of Mercury across the face the Sun will be live streamed by the Griffith Observatory in Los Angeles.

It appears that in Los Angeles the transit will have already started at sunrise, with Mercury at that point about a third of its way across the Sun’s face. Regardless, from about 7 am to 10 am (Pacific) the observatory will provide a view.

UPDATE: Images from an event in New Zealand will upload real time telescope images of the transit here.

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New InSight image of mole shows collapse of hole

10:56 am

View of InSight drill hole
Click for full movie.

The InSight science image has lifted the lander’s rover arm off the drill hole and taken a new series of images in an effort to discover what caused the mole to pop out during its most recent drilling effort.

The image to the right, cropped to post here, was the first in a short movie made from all the images taken over the course of a day. The sequence shows the change in shadows, which helps define the situation in the hole.

This image however I think tells all. It shows that the walls of the hole have collapsed all around the mole, widening it further. It also shows that, once the mole popped out to lean sideways against the left wall, much of that material then fell into the hole, refilling it. These facts are very evident when today’s image is compared with this image from October, taken prior to the most recent drilling effort. The hole has become much wider, there is more material inside it, and the mole is now much farther out.

All these facts bode ill for the mole ever succeeding in drilling down the planned fifteen or so feet to insert a heat probe into the interior of Mars in order to take the first ever measure of the planet’s interior.

An overall assessment of this NASA mission is not very positive. The contribution from its international partners is especially bad. The mission was launched two years late because the French effort to build the seismometer failed. NASA had to subsequently give the job to JPL to get it done. Now the heat sensor is a failure, because the German-built mole has failed to get the heat sensor where it needs to be.

The seismometer and heat sensor were InSight’s only science instruments. This means that we will likely only get results from one.

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More detail on pad abort test parachute issue

10:22 am

At a press telecon yesterday Boeing outlined in more detail the cause of the failure of one main parachute to deploy during its November 4 Starliner pad abort test.

In a call with reporters, John Mulholland, vice president and program manager for commercial crew at Boeing, said an investigation after the Nov. 4 test at White Sands Missile Range in New Mexico led the company to conclude that a “lack of secure connection” between a pilot parachute and the main parachute prevented that main parachute, one of three, from deploying.

The pilot parachute is designed to deploy first, and pull out the main parachute. However, Mulholland said that hardware inspections and photographs taken during “closeout” of the vehicle prior to the test showed that a pin that links the pilot and main parachutes was not inserted properly.

“It’s very difficult, when you’re connecting that, to verify visually that it’s secured properly,” he said, in part because that portion of the parachute system is enclosed in a “protective sheath” intended to limit abrasion but which also makes it difficult to visually confirm the pin is in place. “In this particular case that pin wasn’t through the loop, but it wasn’t discovered in initial visual inspections because of that protective sheath.”

Mulholland said Boeing is modifying assembly procedures through what he called “fairly easy steps,” such as pull tests, to ensure those pins are properly installed. Technicians have already confirmed that the same parachute linkages are properly installed on the three parachutes on the Starliner that will launch in December on an orbital flight test to the International Space Station. [emphasis mine]

That a hardware inspection and photos taken before launch revealed this issue and resulted in nothing being done should rise serious questions at Boeing about its quality control processes. Based on the press telecon, however, it does not appear that Boeing is asking those questions. From a different report:

[John Mulholland, Boeing’s Starliner program manager] praised the rigging team, saying “even before we got eyes on the hardware, that team on their own initiative (was) reviewing the close-out photos and the processes, and they identified the potential issue that was subsequently validated by hardware inspection.”

“Most importantly, they raised their hand and and let us know what they believe the problem was,” he said. “It’s really a testament to the transparency of that team. The speak-up culture that we have, that is what we need on this program.”

While it is good that the rigging team was willing to speak up afterward, it is very bad that their procedures allowed the launch to go forward. The company says it has now changed its rigging procedures, but I don’t sense any effort on Boeing’s part to find out why its so-called “speak-up culture” failed to have these engineers speak-up, before launch.

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How to safely watch the November 11 solar transit of Mercury

10:53 pm

Link here. The last transit of the Sun by Mercury was in 2016, and the next won’t be until 2032.

The site emphasizes the most important fact: Do not watch this without the proper eye protection! If you fail to heed this warning you will likely go blind, for the rest of your life. However, if you follow the instructions and obtain the proper filters, you can watch most safely.

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New video of Starliner pad abort test

3:19 pm

Boeing has released a new video of the Starliner pad abort test on November 4th, showing the full flight.

I have embedded the footage below the fold. The one aspect of this test that I have as yet not seen any explanation for is the red cloud to the left of the capsule’s touch down spot. It surely looks like the kind of smoke one sees from the release of certain toxic fuels. It was also something that the live stream video focused on, suggesting the possibility that its existence was important and needed to be recorded for engineering reasons.

Regardless, the fact that any onboard astronauts would have been safely returned to Earth, based on this test, should mean Boeing’s abort system is functioning properly. They note that they have pinpointed the reason one parachute did not deploy (“attributed to the lack of a secure connection between the pilot chute and one of the main chutes”), a problem that is probably quite simple to fix. Hopefully that one failure will not cause any significant delays in their future flights, including the first manned flight next year.
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The dark future predicted by this week’s elections

1:06 pm

Because the elections this past week on November 5 took place during an off year, they were mostly local, and thus have a limited value in predicting the public’s overall political attitude. The results however can still give us a hint about the future, and are thus worth looking at for that reason.

In general, the results were mostly mixed, with Democrats doing great in some suburbs and in Virginia, and Republicans doing great in the down slate races in Mississippi and Kentucky. The governorship elections were also mixed, with the Republicans winning in Mississippi and the Democrats winning in Kentucky.

Other results also suggest mixed results on a variety of propositions. The link above notes the defeat of a leftist proposition in Washington that would have repealed the state’s prohibition on using affirmative action quotas. On the other hand, in New York City voters approved ranked voting, an election system that Democrats have used in Maine and California to destroy Republican opposition.

Overall however I consider these results a disaster for the future of freedom, democracy, and our Constitutional system. The Democratic Party has made it very clear in the past three years that it no longer respects all three. More importantly, they have also made it clear that they are willing to use slander, libel, and any number of vicious McCarthyite tactics to squelch and destroy anyone who opposes them.

It is terrifying to me that the public seems undecided or ambivalent about these facts, and still willing to vote for Democrats, many of whom have openly supported these tactics and positions. In fact, it suggests a large percentage of the population, majorities in many places, actually applaud the Democratic Party’s fascist tactics and positions.

This week’s elections therefore once again reaffirm for me a very pessimistic future coming in the next few election cycles. Even if Trump should win in 2020, the voting pattern that we have seen in both 2018 (when the voters gave control of the House to the Democrats) and 2019 suggest that his win will be mixed, and that the power the Democrats presently hold in Congress will remain firm and unchallenged. This is what the voters have been telling us. They are not ready to clean house in the Democratic Party.

Dark times are coming. Be ready.

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White House: Cost for each SLS launch is $2 billion

9:34 am

According to the Office of Management and Budget (OPM), the cost for each SLS launch is now estimated to equal $2 billion.

This is the first time anyone in the executive branch has put a number to the SLS per launch cost. NASA has always refused to give a number, for good reason, since this price compares so horribly with even the most expensive private rocket (generally more than $200 million for the biggest members of the Delta rocket family). The Falcon Heavy costs about $100 million, so that to get the same mass into orbit would require two launches, but that would still be only $200 million, one tenth the cost.

The article then notes how this cost is affecting the Europa Clipper mission, which has three launch options, with SLS mandated by Congress.

The powerful SLS booster offers the quickest ride for the six-ton spacecraft to Jupiter, less than three years. But for mission planners, there are multiple concerns about this rocket beyond just its extraordinary cost. There is the looming threat that the program may eventually be canceled (due to its cost and the emergence of significantly lower cost, privately built rockets). NASA’s human exploration program also has priority on using the SLS rocket, so if there are manufacturing issues, a science mission might be pushed aside. Finally, there is the possibility of further developmental delays—significant ground testing of SLS has yet to begin.

Another option is United Launch Alliance’s Delta IV Heavy rocket, which has an excellent safety record and has launched several high-profile missions for NASA. However, this rocket requires multiple gravity assists to push the Clipper into a Jupiter orbit, including a Venus flyby. This heating would add additional thermal constraints to the mission, and scientists would prefer to avoid this if at all possible.

A final possibility is SpaceX’s Falcon Heavy rocket, with a kick stage. This booster would take a little more than twice as long as the SLS rocket to get the Clipper payload to Jupiter, but it does not require a Venus flyby and therefore avoids those thermal issues. With a track record of three successful flights, the Falcon Heavy also avoids some of the development and manufacturing concerns raised by SLS vehicle. Finally, it offers the lowest cost of the three options.

The fact that Congress is requiring the use of SLS for a cost of $2 billion, a rocket that might not even be ready in time, when Europa Clipper could be launched on two other already operational rockets at about a tenth of the cost illustrates well the overall corruption and incompetence that permeates Congress. They really aren’t interested in the interests of the nation. They’d rather distribute money to big contractors and local interests, even if it costs the taxpayer billions and risks the mission’s success.

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Virgin Orbit gets $9.5 million from UK space agency

9:03 am

The space agency of the United Kingdom yesterday awarded $9.5 million to the smallsat rocket company Virgin Orbit

ccording to the statement, the funds will be used “to develop launch operations support systems and manufacture them in the U.K.” in addition to conducting “mission planning, and to further ready the facility for satellite launches from Cornwall”.

This award is part of a larger funding package of $26 million (£20 million) from Cornwall Council and the Cornwall and Isles of Scilly Local Enterprise Partnership, while Virgin Orbit have also said they will contribute about $3.2 million (£2.5 million) to the Spaceport Cornwall project. The hope is that Cornwall could become a hub for European launches to space in the future.

Essentially this is an effort by the UK to bring Virgin Orbit’s launches to Cornwall spaceport. Why Virgin Orbit has got this money is puzzling however. Launched from a 747 which can take off from almost all airports, Virgin Orbit doesn’t necessarily need to launch from a spaceport. That fact is probably why the company got this “pay-off”, using somewhat more blunt words.

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Sightseeing Central Butte on Mars

11:38 am

Central Butte in foothills of Mt Sharp

Overview showing perspective of panorama

Curiosity has now roved to the very foot of Central Butte, where it has been taking close-up and panorama images of the butte and its geological layers. The panorama above was created from three Curiosity navigation images taken on Sol 2577 (November 6, 2019), here, here, and here.

The overview on the right, based on Curiosity’s position about ten sols ago slightly farther from the butte, still indicates roughly with the yellow lines the area photographed in this panorama. The dotted red line indicates Curiosity’s initial planned route.

Following that route Curiosity will eventually climb up onto the plateau beyond this butte, approaching that higher terrain farther to the west. Once they do, however, they will no longer have access to the geological layers below the surface. Central Butte gives them a window into those layers, which is why they are going to spend some time at this location, first by taking a few sols looking at the butte at this point, then circling around to study its back side.

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