Tag: engineering

Rover update: February 20, 2019

1:52 pm

Summary: Curiosity in the clay unit valley. Opportunity’s long journey is over. Yutu-2 creeps to the northwest on the Moon’s far side.

For the overall context of Curiosity’s travels, see my March 2016 post, Pinpointing Curiosity’s location in Gale Crater.

For the updates in the past year go here. For a full list of updates before February 8, 2018, go here.

Curiosity

Curiosity's view to the east on Sol 2316
Click image for full resolution version

Overview of Curiosity's future travels
Click image for original image

Since my January 22, 2019 update, Curiosity finally drove down off of Vera Rubin Ridge into a valley between the ridge and the lower slopes of Mt Sharp. The Mars Reconnaissance Orbiter (MRO) overview on the right has been annotated by me to show the rover’s travels (shown by the yellow dotted line), with its proposed route indicated by the red dotted line. The yellow lines indicate approximately the terrain seen in the panorama above. The panorama was created from images taken on Sol 2016.

The valley that Curiosity is presently traversing is dubbed “the clay unit” or “the clay-bearing unit” by the geologists, based on its make-up determined from orbital data. So far they have found this terrain to be “some of the best driving terrain we’ve encountered in Gale Crater, with just some occasional sandy patches in the lee of small ridges.” Initially they had problems finding any rocks or pebbles large enough for the instruments to use for gathering geological data. For the past week or so, however, they have stopped at “bright exposure of rock” where some bedrock was visible, giving them much better material to work with.
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Hayabusa-2 prepares to land

9:54 am

Ryugu's northen hemisphere

The JAXA science team has released a set of images taken in January by Hayabusa-2 of its landing site on Ryugu, describing how those images helped map the region where touchdown will occur on February 22. The image on the right is one such image.

[It] shows a diagonally imaged photograph of Ryugu, captured by moving the spacecraft towards the direction of the north pole. The upper side of the image shows the north pole and reveals a landscape dominated with many large boulders. The white band extending to the left and right slightly below the center of the image is the equatorial ridge (Ryujin Ridge). The arrow tip marks the planned touchdown site and you can see this site is on the main ridge.

This is the first time we have images the northern hemisphere of Ryugu. In this observation, we acquired data on the equatorial region of Ryugu, the southern and northern hemisphere. Imaging the entire area is very important for creating accurate global shape models for Ryugu.

They should begin beaming images down of the landing approach sometime tomorrow, and will do so about every 30 minutes throughout the sequence.

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How NASA’s X-34 ended up rotting in someone’s backyard

9:41 am

Link here. The story is a wonderful illustration of the epic failure that NASA has represented for the past thirty years. They spent billions, and threw it all away before even one flight.

How the two partly built X-34 spacecraft ended up in someone’s backyard is fascinating in itself, and worth the read.

One detail the article misses is why the X-34 got cancelled in 2001: politics. This program was part of a range of space initiatives under the Clinton administration (including the X-33). All were overpriced and essentially boondoggles. When George Bush Jr. became president, his administration reviewed them all and junked them, replacing them with his own boondoggles (Constellation and Orion).

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Air Force awards launch contracts (3 each) to ULA and SpaceX

9:27 am

Capitalism in space: The Air Force yesterday announced the awarding of launch contracts to both SpaceX and ULA, giving each company three launches.

ULA will receive $441.76 million under a fixed-price contract to launch SBIRS GEO-5, SBIRS GEO-6 and Silent Barker, a classified space situational awareness mission.

SpaceX will receive $297 million to launch AFSPC-44, NROL-85, and NROL-87.

Note the difference in price. While the specific missions might have requirements that make the ULA launches more expensive, I suspect that most of the difference has to do with SpaceX’s ability to simply do it cheaper. The Air Force however did not give all the contracts to SpaceX because it has strategic reasons to have two independent launch companies. It also faces political pressure to support both companies, regardless of cost, as illustrated by recent stories about the political gamesmanship between SpaceX and ULA.

This story does illustrate however how the competition from SpaceX has forced ULA to lower its prices. For these three launches they are charging an average of about $147 million. Before SpaceX’s competition, their price per launch generally averaged more than $225 million. Isn’t competition wonderful?

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The InSight Martian weather station

10:47 am

InSight’s weather station is now providing daily weather updates to the public.

Starting today, the public can get a daily weather report from NASA’s InSight lander.

This public tool includes stats on temperature, wind and air pressure recorded by InSight. Sunday’s weather was typical for the lander’s location during late northern winter: a high of 2 degrees Fahrenheit (-17 degrees Celsius) and low of -138 degrees Fahrenheit (-95 degrees Celsius), with a top wind speed of 37.8 mph (16.9 m/s) in a southwest direction.

This daily weather data can be found here. For the weather from Curiosity, go here. Weekly global weather reports from Mars Reconnaissance Orbiter are found here.

Comparing the weather at the two landers, you will notice that it is generally warmer at InSight. This is not surprising, as Curiosity is climbing a mountain, and is now at a much higher elevation.

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Russia signs contract for two more tourists to ISS

10:40 am

Capitalism in space: Russia has signed a new contract with the American company Space Adventures to send two more tourist flights to ISS, this time at the same time on one Soyuz capsule near the end of 2021.

The article says that the contract is funding the construction of the rocket and capsule.

This deal suggests to me that NASA’s slow-walking of the American private manned effort has resulted in those private companies losing business to the Russians. Had both SpaceX and Boeing been able to launch their capsules by now, as I think they should have, it is quite likely that one of them might have gotten this deal. Instead, they can only look from the sidelines while Russia garners income using our space station.

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The military components of China’s space effort

10:32 am

Link here. Key quote:

Beijing now has a goal of “[building] China into a space power in all respects.” Its rapidly growing space program—China is second only to the United States in the number of operational satellites—is a source of national pride and part of President Xi Jinping’s “China Dream” to establish a powerful and prosperous China. The space program supports both civil and military interests, including strengthening its science and technology sector, international relationships, and military modernization efforts. China seeks to achieve these goals rapidly through advances in the research and development of space systems and space-related technology.

China officially advocates for peaceful use of space, and it is pursuing agreements at the United Nations on the non weaponization of space. Nonetheless, China continues to improve its counterspace weapons capabilities and has enacted military reforms to better integrate cyberspace, space, and EW into joint military operations.

The PLA [People’s Liberation Army] views space superiority, the ability to control the information sphere, and denying adversaries the same as key components of conducting modern “informatized” wars. Since observing the U.S. military’s performance during the 1991 Gulf War, the PLA embarked on an effort to modernize weapon systems and update doctrine to place the focus on using and countering adversary information-enabled warfare.

What this report makes clear is that while China’s space program might have many visibly peaceful components, it is still tightly integrated with China’s military. Everything China does in space goes through the PLA.

We should also be aware that former managers of their space program are dominate throughout China’s entire political structure. Being a good manager in space has become the best route to gaining a powerful political position.

Both facts suggest that China’s space program will for the next few decades only grow in size and ambitions, for many military and nationalistic reasons. This also tells us that it is likely not a good idea to do any cooperative projects with them. They will not really be your partner, but will be using you to further their own ends, entirely.

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A river valley floor on Mars

12:50 pm

Overview of Reull Valles region

Today’s cool image focuses in on a Mars Reconnaissance Orbiter (MRO) uncaptioned photograph taken of the valley floor of Reull Vallis, a meandering canyon that drains into Hellas Basin, the bottom of Mars.

The image on the right is not that photograph. Instead, it is an overview of the area surrounding it. The image location is indicated by the black cross, dead center within the floor of Reull Vallis itself. This valley, as well as Dao and Niger to the northwest but lower in elevation are all thought to have been formed from flowing water, all of which apparently drained from the east and to the west into Hellas Basin.

This last detail is very important and bears repeating before looking at today’s subject image. The river that formed Reull Vallis flowed from the east to the west. Now for that picture.
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Branson seeks new capital for Virgin Galactic/Orbit

8:31 am

Capitalism in space: Apparently short of cash because of his cancellation of a $1 billion investment space deal with Saudi Arabia, Richard Branson has hired a finance firm to find him new capital for his two space companies Virgin Galactic and Virgin Orbit.

Sources said this weekend that Sir Richard was seeking funding that would value Virgin Galactic and Virgin Orbit, which launches satellites for commercial customers, at a combined sum of well over $2bn (£1.55bn).

The precise amount that he is looking to raise has yet to be determined, but people close to the process suggested it would be at least $250m (£193m), representing a minority stake.

The structure of a deal could see new shareholders injecting money into either, or both, Virgin-branded space companies.

I will not be surprised if Branson gets the investment capital for Virgin Orbit. I will also not be surprised if he has trouble finding anyone willing to invest a lot in Virgin Galactic. In fact, this shortage in capital might spell the end of this fourteen year effort at building a reusable spacecraft designed to provide suborbital tourism.

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New LRO image of Chang’e-4 and Yutu-2

10:05 am

Chang'e-4 and Yutu-2

The Lunar Reconnaissance Orbiter (LRO) science team has released its third and best image of the Chinese Chang’e-4 lander and Yutu-2 rover. The image on the right is a full resolution cropped section, with the lander on the bottom and the rover above and to the left.

Just after midnight (UTC) on 1 February 2019 LRO passed nearly overhead the Chang’e 4 landing site. From an altitude of 82 kilometers the LROC Narrow Angle Camera pixel scale was 0.85 meters (33 inches), allowing a sharper view of the lander and Yutu-2 rover. At the time the rover was 29 meters northwest of the lander, but the rover has likely moved since the image was acquired. This view has close to the smallest pixel size possible in the current LRO orbit. In the future however, LROC will continue to image the site as the lighting changes and the rover roves!

These future LRO images will allow us to track Yutu-2 and get an idea of its research, even if the Chinese do not release any information.

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Harpoon concept for removing space junk tested in orbit

10:20 pm

A harpoon, the second of three engineering experiments for capturing space junk, was successfully fired last week.

A British satellite released from the International Space Station last year has successfully demonstrated a harpoon that could be used on future missions to clean up space debris, officials announced Friday.

The harpoon fired out of the RemoveDebris spacecraft Feb. 8, striking a target plate extended from the satellite on a 4.9-foot (1.5-meter) boom. The experiment was one of the main objectives of the $17 million (15.2-million-euro) RemoveDebris mission, conceived as a testbed for technologies engineers hope will allow future satellites to tidy up busy orbital traffic lanes by collecting dead satellites and rockets and driving them back into Earth’s atmosphere to burn up.

In a dramatic video released by Surrey Satellite Technology Ltd., the harpoon is seen catapulting out of the RemoveDebris spacecraft at a velocity of about 45 mph — 20 meters per second — and spearing its target. A cable attached to the harpoon kept the device from flying off and becoming its own piece of space junk.

The first experiment was a test of a net, tested successfully in September. The last of the three experiments, scheduled in a month, will test a sail designed to slow the satellite’s speed so that it gets de-orbited quickly.

I have embedded the video of the harpoon test below the fold.
» Read more

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NASA to put humans on the Moon soon!

3:11 pm

Wanna bet? According to NASA officials, the agency is accelerating its manned effort and expects to return to the Moon with humans by 2028 at the latest!

Jim Bridenstine, NASA’s administrator, told reporters Thursday that the agency plans to speed up plans backed by President Donald Trump to return to the moon, using private companies.

“It’s important that we get back to the moon as fast as possible,” said Bridenstine in a meeting at NASA’s Washington headquarters, adding he hoped to have astronauts back there by 2028.

“This time, when we go to the Moon, we’re actually going to stay. We’re not going to leave flags and footprints and then come home to not go back for another 50 years” he said.

Why does this announcement remind me of similar enthusiastic predictions made by Russia’s space agency, Roscosmos, all of which have never come true? In fact, why does Bridenstine’s prediction remind me of many past NASA predictions since the 1980s, all of which either never happened, or happened decades behind schedule and in a manner that was far from grand?

If NASA is the agency to run this program, this prediction will not happen, period. For NASA to get back to the Moon by 2028 would require them to somehow build Gateway (which Bridenstine labels as a key component in this program) while also accelerating the launch schedule of SLS, a rocket NASA has spent fifteen years building that it doesn’t expect to launch for at least two more years, and will not put humans on it until 2024, at the earliest.

Gateway has not even been funded. It provides no way to get to the lunar surface. If it is funded it will cost billions, and likely take as long to build as SLS. SLS itself is expensive, unwieldy, and incapable of providing launch services for such an ambitious program.

Bridenstine’s announcement though did contain a ray of hope. He and his associates made a big deal about how they wish to hire many different private companies to achieve their goals. If the agency gets out of the way and lets free Americans do the job, then maybe it will happen.

We shall see. NASA’s track record when it comes to letting privately-built manned commercial spacecraft do the job is dismal, and that’s being kind.

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Rather than use American manned capsules, NASA is considering buying more Soyuz astronaut flights

10:32 am

Because of the delays imposed by its safety panel in the development of two American-made manned capsules, NASA is now considering buying more Soyuz astronaut flights from Russia.

Past experience has shown the difficulties associated with achieving first flights on time in the final year of development. Typically, problems will be discovered during these test flights. The consequences of no US crew on ISS warrant protection by acquiring additional seats. The absence of U.S. crewmembers at any point would diminish ISS operations to an inoperable state,” noted a procurement document published on February 13.

NASA is considering contracting with the State Space Corporation “Roscosmos” for these services on a sole source basis for two (2) Soyuz seats and associated services to the International Space Station (ISS) on the Russian Soyuz spacecraft vehicle. This transportation would be for one crewmember in the Fall of 2019 and one crewmember in the Spring of 2020.

Remind me again: What country does NASA work for? From this I think it is Russia, not the United States. The agency has no problem putting its astronauts on a Soyuz rocket, even though Russia has had chronic quality control problems that not only caused a Soyuz launch abort last year but also had someone drill a hole in a manned capsule, an act of sabotage that Russia has still not explained or solved.

Meanwhile, it slow-walks and delays in any manner it can the manned efforts of two American companies, so that it is forced to use Russian rockets. This is unconscionable. Where is Trump, the “America-First” guy? Why isn’t he stepping in and putting an end to this political gamesmanship that clearly favors a foreign power over American companies?

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Major natural gas discovery off of South Africa coast

7:31 pm

The French oil and gas company Total has made a major natural gas discovery off the coast of South Africa that could contain one billion barrels.

Total said it had made a significant gas condensate discovery after drilling its Brulpadda prospects on Block 11B/12B in the Outeniqua Basin.

“It is gas condensate and light oil. Mainly gas. There are four other prospects on the license that we have to drill; it could be around 1 billion barrels of total resources of gas and condensate,” [Chief Executive Patrick] Pouyanne said.

Big money here, which can change the balance of power in terms of fossil fuel energy resources.

Hat tip Max Hunt. I had missed this when it was announced on February 7.

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Monitoring a fresh-looking Martian landslide

4:09 pm

2012 image of Martian landslide
Click for full image

2018 image of Martian landslide
Click for full image

Time for two cool images! To the right are two images taken by the high resolution camera on Mars Reconnaissance Orbiter (MRO), the top one taken in April 2012, and the bottom taken in December 2018. Both have been cropped and reduced slightly in resolution to post here.

The second image is trying to answer, in only a small way, one of the most fundamental questions of the Martian environment: How fast does it change? The images from orbit have periodically seen evidence of new impacts. MRO images have tracked dust devil tracks. And we know that somehow water, ice, wind and volcanic activity have eroded and reshaped the surface over eons.

What we don’t know truly and with detail is the pace of these changes, with any accuracy. The pace of some things over time seems obvious. For example, Mars’s inactive but gigantic volcanoes suggest that once volcanism was very active, but over time has ceased so that today it is unclear if any is occurring. Similarly, the geological evidence suggests that in the far past water flowed on the surface, producing catastrophic floods. Now that liquid water is all but gone, and this erosion process as ceased.
» Read more

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Update your GPS before April 6 or it might not work!

8:31 am

Older GPS and those that have not recently updated their firmware might not work properly after April 6, 2019.

GPS signals from satellites include a timestamp, needed in part to calculate one’s location, that stores the week number using ten binary bits. That means the week number can have 210 or 1,024 integer values, counting from zero to 1,023 in this case. Every 1,024 weeks, or roughly every 20 years, the counter rolls over from 1,023 to zero.

The first Saturday in April will mark the end of the 1,024th week, after which the counter will spill over from 1,023 to zero. The last time the week number overflowed like this was in 1999, nearly two decades on from the first epoch in January 1980.

You can see where this is going. If devices in use today are not designed or patched to handle this latest rollover, they will revert to an earlier year after that 1,024th week in April, causing attempts to calculate position to potentially fail. System and navigation data could even be corrupted, we’re warned.

Devices after 2010 should be all right, but it is advised to update the firmware to the latest version. Earlier devices might not fare so well.

The issue here is not so much handheld outdoor GPS units, but the GPS in smartphones as well as elsewhere. If you think a device you own uses GPS in any aspect, it is probably wise to update its firmware. The world is not going to end if you don’t, but you will guarantee that you will avoid some annoying inconvenience by doing so.

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NASA officially declares Opportunity dead

1:44 pm

NASA today officially announced that the rover Opportunity — built to last 90 days — is dead, only three weeks after celebrating its fifteenth anniversary operating on the Martian surface.

This is what project scientist Steve Squyres had to say about the rover’s finish:

“When I saw that the storm had gone global, I thought this could be it,” said Squyres, explaining that Opportunity was a solar-powered vehicle and needed the sun for energy. “To have Opportunity – designed for 90 days – taken out after fourteen and a half years by one of the most ferocious dust storms to hit the planet in decades, you have got to feel pretty good about it.”

He said: “It was an honorable end, and it came a whole lot later than any of us expected.”

The article gives some nice background into the personal stories of many of the scientists who worked on Opportunity for all those years. For some overall scientific context, see this article. Or you can read the many rover updates I have written in the past two and a half years, which will give you a detailed sense of Opportunity’s travels along the rim of Endeavour Crater.

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Recent Cuba meteorite estimated to have weighed about 360 tons

1:36 pm

Using its imaged track from several sources, scientists have now estimated the size and weight of the recent spectacular fireball over Cuba as being several meters across and weighing about 360 tons.

After reconstructing the trajectory in the atmosphere, the Colombian astronomers “played back” the impact and found that the culprit, a rock with an estimated size of several meters and a weight of about 360 tons, came from an eccentric orbit around the Sun with an average distance to our star of 1.3 astronomical units (1 astronomical-unit = 150 million km). Before impacting the Earth, the rock completed a turn around the Sun every 1.32 years. All that came to an end on February 1, 2019 when both, the rock and the Earth, found themselves at the same point in space, at the same time. The worse part was for the rock!

The article spends most of its time selling a computer model the scientists have developed that they claim can predict the approach trajectory of meteorites, something I find quite unconvincing. However, the result above is important for different reasons. Routinely astronomers today discover new small asteroids just days before they zoom harmlessly past the Earth. Each time one of these new near Earth asteroids is found, the press automatically goes into “Chicken Little mode,” suggesting that should this object have hit the Earth it would have caused massive damage.

Most of these newly discovered asteroids are about the same size as the Cuba meteorite, if not smaller. Thus, this meteorite gives us a clear idea of how completely harmless these other near Earth asteroids are. In fact, this impact suggests to me that in most cases an asteroid would have to be about ten times larger to pose a significant threat.

Keep this number — 360 tons — in mind the next time another near Earth asteroid is discovered.

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InSight deploys heat sensor onto Mars surface

1:22 pm

InSight has successfully deployed its temperature instrument onto the Martian surface, where it will next begin drilling its heat sensor about sixteen feet down into the ground.

Equipped with a self-hammering spike, mole, the instrument will burrow up to 16 feet (5 meters) below the surface, deeper than any previous mission to the Red Planet. For comparison, NASA’s Viking 1 lander scooped 8.6 inches (22 centimeters) down. The agency’s Phoenix lander, a cousin of InSight, scooped 7 inches (18 centimeters) down.

“We’re looking forward to breaking some records on Mars,” said HP3 Principal Investigator Tilman Spohn of the German Aerospace Center (DLR), which provided the heat probe for the InSight mission. “Within a few days, we’ll finally break ground using a part of our instrument we call the mole.”

Whether the spike will be able to get to 16 feet will depend on many factors, such as whether a rock below the surface happens to be in the way.

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NASA about to pull plug on Opportunity

4:58 pm

Rumors today say that during a press conference tomorrow NASA will announce that it is closing the books on the incredibly successful rover Opportunity.

From the first link:

NASA said Tuesday it will issue a final series of recovery commands, on top of more than 1,000 already sent. If there’s no response by Wednesday — which NASA suspects will be the case — Opportunity will be declared dead, 15 years after arriving at the red planet.

Opportunity was supposed to last 90 days. Instead, it lasted just under fifteen years, drove 28 miles, and saw far more of the Martian surface than anyone ever expected.

It now sits inside the rim of fourteen-mile Endeavour Crater, waiting for those first explorers to come and get it. I wonder when that will be.

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Strange crescent-shaped pit near Martian south pole

2:19 pm

crescent-shaped pit near Martian south pole

Cool image time! The south polar cap of Mars is a strange place. It is largely ice, with a seasonal cap of frozen carbon dioxide, or dry ice. Because the dry ice sublimates away during the summer months, the cap undergoes regular changes that reshape it, producing alien features that are not seen on Earth.

The image on the right is another example of these alien features. I found it in the February image release from the high resolution camera on Mars Reconnaissance Orbiter. I have merely cropped the full image to focus at full resolution on its primary feature, a region of stippled-like surface surrounding an area of black striping that in turn surrounds a crescent-shaped pit outlined by whiter material.

Why is there a pit here? Why is it crescent-shaped? Why is it surrounded by that whiter material? I could guess and say that the pit is a vent from which water vapor from the lower cap of water sprays out onto the upper cap of frozen carbon dioxide, staining it with white ice, but I am most likely wrong.

Moreover, what causes the black striping, as well as the stippled material surrounding it? The black stripes are probably related to a similar process that forms the spider formations found in the polar regions, except that these are not spiders. Why the parallel straight lines?

A lot of questions with no answers. While many features on Mars are strange, the features near the poles are probably stranger still, as they form in a place with chemistry, temperatures, gravity, and materials in a combination and scale that we on Earth have no experience with.

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Chang’e-4 & Yutu-2 enter sleep mode for second lunar night

9:40 am

The Chinese lunar lander Chang’e-4 and its rover Yutu-2 have both gone into hibernation as part of their preparation for surviving their second night on the Moon’s surface.

The Yutu-2 rover and lander will resume science and exploration activities on Feb. 28 and March 1, respectively, according to the release, with the rover needing to unfold solar panels and dissipate heat.

The previous lunar night saw the Chang’e-4 lander record a temperature low of -190 degrees Celsius (-310 Fahrenheit), with measurements made possible by a Russian-developed radioisotope thermoelectric generator which also acts as a prototype for future deep-space exploration.

Official updates on the progress of the mission had been sparse during the second lunar day of operations, though some new images and footage were released ahead of the Chinese New Year holiday, which ran from Feb. 4 to Feb. 10.

Yutu-2 has traveled about 400 feet so far.

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Military inspector general to review SpaceX’s launch certification

9:11 am

The swamp attacks! The inspector general for the Defense Department has begun a review of the process the Air Force used to certify SpaceX as a qualified military launch provider.

“Our objective is to determine whether the U.S. Air Force complied with the Launch Services New Entrant Certification Guide when certifying the launch system design for the Evolved Expendable Launch Vehicle-class SpaceX Falcon 9 and Falcon Heavy launch vehicles,” the inspector general said in a memo to Air Force Secretary Heather Wilson sent on Monday.

The only reason I can see for this investigation is that the launch companies that have development contracts with the military — ULA, Northrop Grumman, and Blue Origin — are applying pressure to get SpaceX eliminated as a competitor. And since there are many in the government aerospace bureaucracy who are in bed with these companies and are also hostile to SpaceX, that pressure has succeeded in getting this investigation started.

SpaceX meanwhile has successfully launched one military payload, and has two more military launches scheduled for 2019. Its prices are so low that these other companies cannot presently compete, not without political help. Worse, it appears these other companies, and the Air Force, do not appear interested in reducing the cost of their next generation rockets to become more competitive. Instead, they apparently have decided to turn the screws on SpaceX and get it eliminated as a competitor.

Meanwhile, SpaceX might be doing its own political push back, behind the scenes. At least, why else did two California lawmakers recently demand a review of the Air Force’s rocket development contracts to all of SpaceX’s competitors, but not SpaceX?

All of this has absolutely nothing to do with picking the best and cheapest launch companies to save the taxpayer money. Instead, the entire way our government operates today is completely uninterested in the needs of the nation. The focus of lawmakers and government officials is to play political games in an effort to take out their opponents. And in this battle the country be damned.

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Second orbital launch failure in a month for Iran rocket

7:40 pm

According to U.S. officials, Iran has attempted and failed twice in the past month to place satellites in orbit.

Iran’s second try in less than a month to send a satellite into orbit apparently failed shortly after liftoff from a remote desert launch pad under daily surveillance from a fleet of commercial imaging spacecraft, according to U.S. government officials and independent analysts.

Images of the launch pad in north-central Iran taken by orbiting satellites owned by U.S. companies suggest a rocket launch occurred last week, but the U.S. military’s catalog of space objects registered no new spacecraft in orbit. A satellite launch attempt was expected in recent weeks based on statements from Iran’s government and observations of increasing activity at the launch site.

Iran has admitted to a launch failure on January 15, though it denies the failure last week, claiming instead that the February launch succeeded in placing its satellite in orbit, even though no new satellite has been detected.

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MAVAN shifts priorities to communications

7:28 pm

The Mars orbiter MAVAN, designed primarily to study Mars’s atmosphere, is now lowering its orbit as it shifts its primary function from science to communications between the Earth and the rovers on the surface.

A strong telecommunications antenna signal is not the only benefit of a tighter orbit. Coming in nearly 1,000 miles (about 1,500 kilometers) closer also will allow the MAVEN orbiter to circle Mars more frequently – 6.8 orbits per Earth day versus 5.3 previously – and thus communicate with the Mars rovers more frequently. While not conducting relay communications, MAVEN will continue to study the structure and composition of the upper atmosphere of Mars. “We’re planning a vigorous science mission far into the future,” Jakosky said.

In a sense, NASA here is finding a way to replace the Mars communications satellite that it wanted but was not able to get funded.

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NASA’s political and corrupt safety panel

2:49 pm

After spending the last few years complaining about certain specific issues with the manned capsule efforts of SpaceX and Boeing, NASA’s safety panel this past weekend released its annual 2018 report. (You can download the report here [pdf].) Its position now on those certain specific issues can now be summarized as follows:

They make no mention of the parachute issues that forced Boeing to do numerous extra tests, causing probably a year delay in the program, though Boeing has had decades of experience with capsule parachutes and the entire American aerospace industry has never had a parachute failure.

The panel also admits that their concerns about SpaceX’s rocket fueling procedures is really not an issue.

The NESC [NASA Engineering and Safety Center] has independently studied the load and go procedure and provided a thorough report that identifies the hazards and available controls. Based on the NESC report, the CCP [Commercial Crew Program] has decided that the load and go concept is viable if subsequent analysis is adequate and if verifiable controls are identified and implemented for all the credible hazard causes that could potentially result in an emergency situation or worse.

As Emily Litela said, “Never mind!” Their concerns were never credible, as it really doesn’t matter if you fuel the rocket before or after the astronauts board, because in either case they are there when a lot of fuel is present. All the panel did was delay the first Dragon launch by at least a year by pushing this issue.

The panel is still holding onto its concerns about the installation blankets (COPV) used in SpaceX’s internal helium tanks, the location of the problem that caused the September 2016 launchpad explosion. Despite SpaceX’s apparent fixing of this problem, with 40 successful launches since that failure, they are listing further vague requirements:
» Read more

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LRO spots Chinese lunar rover

10:31 am

Yutu-2 and Chang'e-4 on far side of Moon

The Lunar Reconnaissance Orbiter (LRO) science team has now released a second and closer image of Chang’e-4’s location on the far side of the Moon, which now also shows the nearby rover Yutu-2.

The two arrows in the image to the right, cropped to post here, show both. The rover is the dot on the right, with the lander to the left, both just beyond the arrow tips. Both are very small, with Yutu-2 for example only two pixels across. Still, with both you can see their shadows, equally small, to the left of both bright dots. With sunlight coming from the right, all the craters, which are recessed, have their shadows on the right. The spacecraft, sticking up from the surface, have shadows going to the the left.

As Yutu-2 continues its travels, LRO will likely take more images, allowing us to track it even if the Chinese provide limited information.

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SpaceX’s new Raptor engine: The world’s most powerful?

10:19 am

According to a tweet by Elon Musk, SpaceX’s new Raptor rocket engine has achieved during testing a chamber pressure that exceeds that of Russia’s RD-180 engine, which for decades has held the record.

First and foremost, it’s far too early to actually crown Raptor as the new official record-holder for combustion chamber pressure. RD-180 has been reliably flying on ULA’s Atlas V rocket with chamber pressures as high ~257.5 bar (3735 psi) since the year 2000, while Raptor has been performing subscale integrated testing for roughly two years and full-scale integrated testing for less than seven days. As such, the fact that full-scale Raptor has achieved ~269 bar (3900 psi) is an almost unbelievably impressive achievement but probably shouldn’t be used to jump to any conclusions just yet.

Thanks to the 10-20% performance boost supercool liquid methane and oxygen will bring Raptor, currently stuck using propellant just barely cold enough to remain liquid, the engine performing tests could already be made to reach its design specification of 300+ bar (4350+ psi), although Musk cautioned that he wasn’t sure Raptor would be able to survive that power in its current iteration. Nevertheless, 250 bar is apparently more than enough to operate Starship and its Super Heavy booster during most regimes of flight, although maximum thrust (and thus max chamber pressures) is probably desirable for the first minute or so after launch when gravity losses are most significant. [emphasis in original]

If the Raptor meets these goals, it will make most of Musk’s dreams for Startship and Super Heavy very possible.

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New Horizons’ farewell image of Ultima Thule

4:34 pm

Ultima Thule's shape

The New Horizons science team has released the last sequence of images taken by the spacecraft as flew away after its flyby.

The link has a nice video of that sequence. However, it is the information gleaned from this sequence that is most interesting.

The newly released images also contain important scientific information about the shape of Ultima Thule, which is turning out to be one of the major discoveries from the flyby.

The first close-up images of Ultima Thule – with its two distinct and, apparently, spherical segments – had observers calling it a “snowman.” However, more analysis of approach images and these new departure images have changed that view, in part by revealing an outline of the portion of the KBO that was not illuminated by the Sun, but could be “traced out” as it blocked the view to background stars.

Stringing 14 of these images into a short departure movie, New Horizons scientists can confirm that the two sections (or “lobes”) of Ultima Thule are not spherical. The larger lobe, nicknamed “Ultima,” more closely resembles a giant pancake and the smaller lobe, nicknamed “Thule,” is shaped like a dented walnut.

The image on the right shows their preliminary guess at Ultima Thule’s overall shape, as suggested by these new images.

The spacecraft has still not sent back the images it took during its closest approach, so there are likely more surprises coming.

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