Tag: engineering

Cassini successfully completes first dive between Saturn and its rings

8:14 am

The Cassini spacecraft has successfully survived its close flyby of Saturn, diving between the rings and the top of the planet’s cloud tops.

As it dove through the gap, Cassini came within about 1,900 miles (3,000 kilometers) of Saturn’s cloud tops (where the air pressure is 1 bar — comparable to the atmospheric pressure of Earth at sea level) and within about 200 miles (300 kilometers) of the innermost visible edge of the rings.

Cassini is beaming down its images and data now, with the images to be available later today.

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Third reaction wheel on Dawn fails

7:33 pm

The third of four reaction wheels on Dawn failed on April 23, forcing the spacecraft to use its conventional thrusters to orient itself.

The team discovered the situation during a scheduled communications session on April 24, diagnosed the problem, and returned the spacecraft to its standard flight configuration, still with hydrazine control, on April 25. The failure occurred after Dawn completed its five-hour segment of ion thrusting on April 22 to adjust its orbit, but before the shorter maneuver scheduled for April 23-24. The orbit will still allow Dawn to perform its opposition measurements. The reaction wheel’s malfunctioning will not significantly impact the rest of the extended mission at Ceres.

This might shorten Dawn’s remaining mission, but since it is in its final days anyway, the loss will not be severe.

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Report finds NASA spacesuit development over budget, behind schedule, and inadequate

7:29 pm

Government in action! A NASA inspector general report has found that NASA’s program for developing new spacesuit is behind schedule, over budget, and unable to provide the necessary spacesuits needed for the agency’s future projects.

NASA’s spacewalking suits are in short supply, and a replacement is still years away despite the nearly $200 million spent on new technology, the space agency’s inspector general reported Wednesday. A next-generation suit for spacewalking astronauts is needed for future space travel, including trips to Mars. But a lack of a formal plan and destinations has complicated suit development, according to the report . At the same time, NASA has reduced funding for suit development, putting more priority instead on space habitats.

According to the report, NASA is dealing with a variety of design and health risks associated with the spacewalking suits used by astronauts aboard the International Space Station. The suits were developed more than 40 years ago and intended for 15 years.

More here. Essentially, the suits NASA presently uses on ISS don’t work well, there aren’t enough of them left, and they are difficult to maintain because they were designed for transport up and down on the space shuttle. At the same time NASA’s entire program to replace these suits has been mismanaged so badly that no replacement suits are anywhere on the horizon,even after spending hundreds of millions of dollars.

I predict that the next new spacesuit Americans use will be built in less than five years for a tenth the cost, by private companies.

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Cassini about to make first dive into Saturn’s rings

8:27 am

Cassini will make its first dive through a gap in Saturn’s ring today, and this link provides details.

Because that gap is a region no spacecraft has ever explored, Cassini will use its dish-shaped high-gain antenna (13 feet or 4 meters across) as a protective shield while passing through the ring plane. No particles larger than smoke particles are expected, but the precautionary measure is being taken on the first dive. The Cassini team will use data collected by one of the spacecraft’s science instruments (the Radio and Plasma Wave Subsystem, or RPWS) to ascertain the size and density of ring particles in the gap in advance of future dives. As a result of its antenna-forward orientation, the spacecraft will be out of contact with Earth during the dive.

The first images are not expected until mid-day tomorrow.

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Latch blamed for Webb vibration test issue

6:03 pm

A latch that hadn’t closed properly has been identified as the cause of the anomaly that halted vibration testing of the James Webb Space Telescope in December.

At the committee meeting, Smith said the problem was tracked down to a latch designed to hold in place one of the wings of JWST’s primary mirror, which consists of 18 hexagonal segments. Those wings are folded into place to fit within the payload fairing of the Ariane 5 that will launch JWST, then deployed into place once in space. The latch, he said, consists of two plates with serrated teeth a few millimeters in size. “The thought is that the teeth, when they closed it, they didn’t quite seat,” he said. “So during the vibe [test], the teeth clapped together on the order of a millimeter or two, and that was what made the noise.”

Engineers were able to replicate the noise by placing the plates slightly out of alignment in the lab and subjecting them to similar vibrations, giving them confidence that was the cause of the anomaly.

I love how the Webb program manager also says that Webb is “on budget and on schedule.” That claim could only be true if you make believe that the budget was always $9 billion and the launch date was always supposed to be 2018 instead of the original $1 billion and 2011 launch date.

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Cassini makes last fly-by of Titan

11:38 am

Cassini on April 21 made its last fly-by of Titan as the spacecraft is prepared for its final 22 orbits of Saturn.

The flyby also put Cassini on course for its dramatic last act, known as the Grand Finale. As the spacecraft passed over Titan, the moon’s gravity bent its path, reshaping the robotic probe’s orbit slightly so that instead of passing just outside Saturn’s main rings, Cassini will begin a series of 22 dives between the rings and the planet on April 26. The mission will conclude with a science-rich plunge into Saturn’s atmosphere on Sept. 15. “With this flyby we’re committed to the Grand Finale,” said Earl Maize, Cassini project manager at JPL. “The spacecraft is now on a ballistic path, so that even if we were to forgo future small course adjustments using thrusters, we would still enter Saturn’s atmosphere on Sept. 15 no matter what.”

The flyby zipped past Titan only a little more than 600 miles above its surface.

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Refueling tests begin on Chinese test space station

8:04 am

China has begun the refueling tests between its first unmanned freighter, Tianzhou-1, docked to its test space station, Tiangong-2.

Refuelling tests began at 07:26 Beijing time on Sunday (23:26 UTC Saturday), monitored from the Beijing Aerospace Control Centre (BACC). The refuelling process involves 29 steps and will take five days to complete.

To allow refuelling to take place, the propellant tube and coupling components needed to be perfectly matched after docking, with a margin error of less than 1 millimetre, according to Tianzhou-1 deputy chief designer Chen Qizhong.

The mission involving the Tianzhou and Tiangong spacecraft was designed to prove on-orbit resupply and refuelling technologies and techniques necessary for safe, long-term operation of the Chinese Space Station, which will be permanently crewed by at least three astronauts.

“After refuelling is completed, the residual propellant needs to be drained off. In order to identify security issues during the draining process, it needs to go through a number of tests and verification,” Bai Mingsheng, chief designer of Tianzhou-1, told CCTV+

The article also provides a great deal of information on the station and the freighter.

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Vector suborbital rocket test scrubbed

7:43 am

A suborbital test flight of Vector’s orbital rocket was scrubbed on April 6 when a sensor aborted the launch.

The next test flight is scheduled for May 3, after a test April 6 at the company’s test site near the Mohave Desert was scrubbed when a sensor caused an automatic abort, Cantrell said.

Engineers quickly determined the rocket was functional but the company decided not to launch after high winds kicked up. But the rocket is fine, he said, adding that failures are part of the testing process. “We blew a lot of stuff up, trust me,” he said.

The article is more focused on describing in detail the company’s overall status, its fund-raising effort, its future plans, its present operation. This tidbit about the test launch was buried in it. That the flight didn’t fly is not a bad mark on the company, at this point. However, they are under pressure to fly as soon as possible in order to demonstrate success, and delays work against them.

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Airbus-Safran gets go-ahead to build first Ariane 6 test rocket

8:30 am

Capitalism in space: The European Space Agency (ESA) has given Airbus-Safran the go-ahead to build the first Ariane 6 rocket, which will be used for ground tests.

It is really important to recognize how this article illustrates the major things that have occurred in how Europe is builds its rockets. Note first that Arianespace is not mentioned at all, even though government bureaucracy has been in charge of ESA’s commercial business for decades. It is not in control any longer and is thus irrelevant. Note also that the design was created solely by Airbus-Safran, and that the only thing ESA did was approve it. The agency did not micromanage it, or revise it, or insist on changes, as would have been the case less than three years ago. Instead, it appears they essentially rubber-stamped it, leaving this work entirely to the private company, which in the end will operate and sell the rocket entirely for profit, while also providing ESA its needed launch vehicle.

At first glance, it appears that the ESA has adopted here the recommendations that I made in my policy paper, Capitalism in space:. In truth, they made these policy changes well before my paper was even written, which helps illustrates forcefully their universal correctness. If you want things built well and efficiently, you give people ownership of their work, you let them create it, and you get out of the way.

Or to use that forgotten word, you let freedom work its magic.

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China’s first unmanned freighter successfully docks with test station

8:04 am

Tianzhou-1, China’s first unmanned space freighter, today successfully docked with that nation’s test station module, Tiangong-2.

Tianzhou-1, China’s first cargo spacecraft, which was launched Thursday evening from Wenchang Space Launch Center in south China’s Hainan Province, began to approach Tiangong-2 automatically at 10:02 a.m. Saturday and made contact with the space lab at 12:16 p.m.

The Tianzhou-1 cargo ship and Tiangong-2 space lab will have another two dockings. The second docking will be conducted from a different direction, which aims to test the ability of the cargo ship to dock with a future space station from different directions. In the third docking, Tianzhou-1 will use fast-docking technology. It normally takes about two days to dock, while fast docking will take only six hours.

This testing program by China is very well thought out. They are performing a whole range of docking tests, and they are doing it with an unmanned prototype station that well simulates the full scale station they eventually plan to build.

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The Israeli finalist in the Google Lunar X-Prize is out of the running

10:19 pm

The Israeli team for the Google Lunar X-Prize, one of the five finalists, can no longer win the race because its SpaceX launch will not take place before the end of the year.

SpaceIL, formed by veterans of the Israeli tech sector, will not be able to launch by the year-end deadline set by the race’s organizers, according to Spaceflight Industries, the space transport company hired to carry the team’s spacecraft on a Falcon 9 rocket launch it purchased from SpaceX.

A Spaceflight executive tells Quartz that SpaceIL’s rocket is still in the launch queue but will be unable to launch before 2018, effectively scotching SpaceIL’s chance at the contest barring a last-minute extension to the deadline.

The article does a nice job of summarizing the situation for all five finalists, all of which appear to have problems that could prevent them from flying before the deadline at the end of 2018. It also notes that an extension could also be granted, as has happened twice before.

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Trump signs commercial weather satellite bill

4:14 pm

Capitalism in space: President Trump today signed the new law that strongly encourages NOAA to begin using privately acquired weather data.

Among the bill’s provisions is language formally authorizing the National Oceanic and Atmospheric Administration to purchase weather data from commercial satellite systems. The bill authorizes NOAA to spend $6 million a year in fiscal years 2017 through 2020 for a pilot program of data purchases to evaluate the effectiveness of commercial data to support weather forecasting.

NOAA has already started such a pilot program using $3 million appropriated to the agency in fiscal year 2016. In September 2016, NOAA awarded contracts to GeoOptics and Spire, with a combined value of a little more than $1 million, for GPS radio occultation data.

These are only baby steps. At this time NOAA’s bureaucracy views commercial space the same way that NASA did back in 2004: it is a threat and also incapable of doing the job. Since NOAA today, like NASA in 2004, has been unable to do the job very well itself, its ability to argue against private space is limited. Expect the pressure to build for NOAA to hand over more and more of its weather-gathering work to private companies.

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Mars rover update: April 21, 2017

1:00 pm

Curiosity

Curiosity's position, Sol 1664 (April 10, 2017)

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

Since my previous February 14, 2017 update, Curiosity has worked its way through the dunes and has emerged, as planned at the head of what looks like a dry wash flowing down from Mount Sharp. At the time I had predicted that the science team would then have the rover make a beeline to Mount Sharp, following the smoothest route. That prediction is almost certainly wrong. Instead, the scientists are probably going to have the rover zig-zag its way south into the dry wash so that they can study the geology there. This is what they have been doing, as shown on the traverse map to the right, which shows Curiosity’s location through Sol 1664 (April 10). Ideally I expect them to want to check out the flow areas of the central parts of the wash as well as the contact point on either side where the color of the terrain changes from dark to light. This appears to be what they doing now, two weeks later, based on this update posted yesterday.

The 23 m drive on Sol 1673 put Curiosity alongside Murray bedrock blocks that appeared to be capped with a different material, with a darker color and smoother texture relative to the Murray

» Read more

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How Russia’s next ISS module got contaminated

9:44 am

Russia’s next module for ISS, MLM or Nauka, has been delayed years because of the discovery of sawdust sized metal particles throughout the module’s propulsion system. This article describes how this happened, showing the incredibly incompetence and bad quality control that caused it.

At the time, workers at Khrunichev were cutting pipelines and removing other components of the module’s propulsion system, in order to reconfigure it from its original role as a backup to the Zarya FGB module into the MLM. For example, a set of six tanks, which would be used for refueling of the ISS during the FGB mission, were removed from the exterior of the spacecraft in order to make room for scientific instruments and for the attachment of the European Robotic Arm, ERA.

The official conclusion of the probe said that the contamination had stemmed from the “lack of methodological and technological support for the operations of cutting pipeline connections in the pneumatic and hydraulic system, PGS, which was needed to guarantee the meeting of requirements for ensuring the sterility of the internal cavities in the pipelines and system hardware.” It is essentially bureaucratic speak for letting metallic dust formed during sawing off the lines pour into the interior of the remaining components.

According to one legend circulating at GKNPTs Khrunichev, the workers who were sawing off pipelines from the module thought they were dismantling the entire spacecraft for scrap. That story would sound completely unbelievable if not for other almost as incredible incidents of carelessness, poor quality control and incompetence within the industry in recent years, such as the installing navigation sensors on a Proton rocket in the upside down position or loading a Block DM-03 space tug on another Proton with too much propellant.

Read the whole story. It is most revealing of the overall systematic problems within Russia’s aerospace industry.

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China launches first unmanned freighter in test flight

7:03 pm

China today successfully launched its first unmanned cargo freighter, Tianzhou-1.

After entering orbit, according to CCTV-Plus interviews with Chinese space officials, Tianzhou-1 is slated to conduct a first docking with Tiangong-2 in a few days. The two spacecraft will then have a two-month in-orbit flight to test the liquid-propellant refueling as well as the cargo spaceship’s control of the combined vehicles, CMSA officials said.

The two spacecraft will also fly separately for three months, during which time the cargo spaceship will complete its own space science experiments. Then the two will have the third docking to test the automatic fast-docking technology, a test to complete the docking within 6 hours.

This was also the second launch of their most powerful rocket, Long March 7, and the second launch from their new spaceport at Wenchang.

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Scientists release geological map of potential landing site for 2020 rover

3:51 pm

Researchers have released a detailed geological map of Northeast Syrtis Major, one of the prime candidate landing sites for NASA’s next Mars rover, scheduled for launch in 2020.

Within Northeast Syrtis are the mineral signatures of four distinct types of watery and potentially habitable past environments. Those minerals had been detected by prior research, but the new map shows in detail how they are distributed within the region’s larger geological context. That helps constrain the mechanisms that may have formed them, and shows when they formed relative to each other.

The lowest and the oldest layer exposed at Northeast Syrtis has the kind of clay minerals formed when rocks interact with water that has a fairly neutral pH. Next in the sequence are rocks containing kaolinite, a mineral formed by water percolating through soil. The next layer up contains spots where the mineral olivine has been altered to carbonate—an aqueous reaction that, on Earth, is known to provide chemical energy for bacterial colonies. The upper layers contain sulfate minerals, another sign of a watery, potentially life-sustaining environment.

Understanding the relative timing of these environments is critical, Mustard says. They occurred around the transition between the Noachian and Hesperian epochs—a time of profound environmental change on Mars.

This press release is very much an effort by these scientists to influence the final landing site choice. They like this site, and they want to convince other scientists that are part of the project to agree with them.

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Private company builds high resolution space radar facility in Texas

6:36 pm

Capitalism in space: A private company, Leo Labs, has built a high resolution space radar facility in Midland, Texas, aimed at providing satellite companies precise location information of their orbiting satellites as well as the space junk that might threaten them.

It is not clear from the article or the company’s webpage whether they are funded by the federal government or by private capital investment. Up until now this data has been routinely gathered by the U.S. military, though obtaining it has I think been somewhat difficult due to security concerns. It seems this company is trying to compete with the government in offering a better data stream that is also easier to obtain.

Posted over Poland during my return flight from Israel.

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Israeli student cubesat launched from Atlas 5

6:04 pm

When the Cygnus capsule was placed in orbit yesterday, it also released a number of nanosats, one of which was a cubesat built by Israeli high school students.

More than 80 pupils in grades 9-12 at schools in Herzliya, Ofakim, Yeruham, Ofra, and the Bedouin town of Hura helped to construct Duchifat-2, which weighs just 1.8 kilograms (four pounds), and is just 20 centimeters (eight inches) tall and 10 centimeters wide. Due to its small size, the satellite has no motors and instead uses the earth’s magnetic field to keep itself correctly aligned in space.

Cubesats have generally been built and launched as college projects to help teach students the engineering behind satellites. This however was the only nanosat released by the Atlas 5 that involved high school students.

Note also that the project did not simply involve Jewish students.

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Want your food kosher in space?

9:57 am

While some of the food can be kosher, it is presently not possible for an astronaut on ISS to maintain a completely kosher diet.

It has nothing to do with the space station per se; it has to do with our food production facility,” Kloeris told Space.com. “We have a single packaging room on the U.S. side. All of the food that’s part of our standard menu that we provide — from what I understand, in order for them to be kosher and halal, they have to be done in separate, unique facilities. Therefore, everything we package would not meet that requirement.”


Kloeris noted that it’s possible to travel with a limited allotment of kosher or halal foods, in order to honor an astronaut’s heritage; every astronaut is allowed a certain number of crew-specific containers sent to the space station, which can account for about 10 percent of their diet.

The same limitations also apply to halal food for Muslims.

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Luxembourg rejects proposed space legislation because of Outer Space Treaty

9:37 am

Luxembourg’s legislature has rejected a proposed space regulatory framework because it did not address the legal restrictions on property rights imposed by the United Nations Outer Space Treaty.

Schneider, the deputy prime minister and minister for economy, presented a bill whose objective was to set a legal framework and give legal security to the property of minerals and other valuable resources in space, in particular on asteroids, and to regulate the authorisation and surveillance of both exploration and mining missions.

In a formal opinion published on 7 April, the council noted that private property claims are illegal or at least not legally binding in most of the international treaties and agreements relating to space and celestial bodies.

Neither the UN treaty on principles governing the activities of states in the exploration and use of outer space, including the moon and other celestial bodies of 1967, nor the agreement governing the activities of states on the moon and other celestial bodies of 1979 (which was not ratified by Luxembourg) answer the question of private property of space resources.

What is most important here is that the Luxembourg government now intends to “to ask for a revision of the question of property in the Outer Space Treaty.” As I said in my op-ed in The Federalist on Monday, nations are increasingly recognizing that the Outer Space Treaty is a problem for property rights, and needs to be revised. Otherwise, private development will be difficult if not impossible.

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Japan aims for record 8 launches in 2017

3:46 pm

Capitalism in space: If all goes as planned, Japan plans to launch a record of eight launches in a single year in 2017, partly because they will begin launch that nation’s own GPS satellite constellation.

Most of these satellites are government launches. Still, the number and in increase in launch pace indicates that Japan does not wish to be left behind in the increasing competition within the launch industry.

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North Korea missile test fails

9:35 pm

North Korea on Sunday failed to launch another ballistic missile, with the missile apparently exploding immediately upon launch.

This failure once again highlights the fact that North Korea’s communist totalitarian culture, which has made that nation very poor, puts some limit on its ability to build things like intercontinental missiles and nuclear bombs. At the same time, we must never underestimate the ability of madness to achieve irrational things. North Korea continues to be a very dangerous player on the international stage, which is why the Trump administration’s aggressive threats against it have not been protested by China in a strong manner, and instead have prompted that nation to finally apply its own pressure against Pyongyang.

In fact, it appears to me that the only ones with strong misgivings about the Trump administration’s aggressive policy against North Korea’s missile and nuclear program have been leftwing politicians, academics, and journalists here in the U.S.

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Audit finds SLS unlikely to launch in 2018

4:00 am

A NASA audit has found that it is unlikely that the first SLS test flight will take place as scheduled in 2018, and that the first manned flight is also likely to be delayed from its 2021 launch target.

“NASA’s first exploration missions — EM-1 and EM-2 — face multiple challenges that will likely delay their launch,” the report states. The missions “are not likely to launch by 2018 or 2021, respectively,” it continues.

When might a crew launch? Hard to say.

The report says incomplete NASA information makes it “more difficult for both the agency and external stakeholders to gain a full understanding of the costs of that mission or to assess the validity of the agency’s launch date assumptions.”

If the first manned flight happens in 2023, as now expected, it means that it will occur 20 years after George Bush first proposed the Crew Exploration Vehicle (Orion) and the heavy lift rocket to put it into space. The total cost to fly this one mission will be approximately $43 billion.

Let me repeat that: $43 billion and 20 years to fly a single manned mission. Does no one in government see something wrong with this picture?

Posted from the West Bank settlement of Beitar Illit.

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China launches advanced communications satellite

9:28 pm

China today successfully launched an experimental communications satellite, outfitted to test the use of ion engine attitude thrusters as well as ground-to-orbit laser communications tests.

The article also outlines China’s busy launch schedule in April, which will include the launch and first test flight of their Tianzhou-1 cargo freighter. That flight will test the freighter’s ability to rendezvous and dock with their Tiangong-2 test space station module. This article notes that the freighter has been mounted on its Long March 7 rocket in preparation for launch in mid-April.

Posted in the air, now past Nova Scotia and moving into the Atlantic.

I must say that I am very glad to get out of Newark Airport. Though they have recently upgraded the airport, they have done so at the cost of providing affordable services to the traveler. All the restaurants there are very over-priced, and provide tiny portions. I actually ended up eating two dinners at two different restaurants in order to get enough food, and paid almost $40 for the pleasure. In addition, the tip was automatically added to the bill. I had no choice about that, even though the service was routinely bad. (They had installed tablets at every table so that you could order by computer. Getting a waiter to provide water however was practically impossible, and when I did get one they were slow to bring it.)

In addition, there were no fast food restaurants, which I normally avoid but would have been a far better choice in this case.

Newark is part of the New York urban area, a decidedly leftwing Democratic enclave. Thus, I am not surprised that things there cost too much, provided poor service, and also provided few choices.

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First Falcon Heavy side first stage ready for initial tests

9:11 pm

Capitalism in space: SpaceX prepares for first Falcon Heavy launch this fall, with the first side stage ready for its first hot fire static tests while the company prepares the launchpads.

They need to finish repairing the launchpad damaged in the September 1 explosion so that the Falcon 9 can once again launch from there. Once this is done, they have an estimated sixty days of additional work to do with the Falcon Heavy pad. It is expected the switch back to the old pad will take place by August. meaning that the first Falcon Heavy launch will likely happen no earlier than October.

Posted while in the air over Nova Scotia on the way to Israel.

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China and South Korea agree to counter North Korea’s missile/nuclear program

9:33 am

Under pressure from the Trump administration to do something about North Korea’s out-of-control and aggressive nuclear and missile program, China has worked out an agreement with South Korea to take “strong action”.

It remains a question how serious this response will be, but it is also the first sign in a long time that China is finally taking the threat from North Korea seriously.

Update: China refuses acceptance of coal from a fleet of North Korean ships.

This new story confirms that China was serious about this ban when it announced it in February. Set to run to at least the end of this year, the loss of income to North Korea, very poor already, should have some influence there. Whether good or bad, however, remains unknown. One cannot expect irrational and mad individuals holding great power to come to rational conclusions.

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