Tag: spaceflight

New technology for future missions to Venus

8:55 am

Link here. The article begins by focusing on new hardened computer chips that can survive the harsh conditions of the Venusian surface, then moves to discussing our state of knowledge of the Earth’s sister planet, and the possibilities of future missions.

The article is definitely worth reading, but it tends I think to exaggerate how close the technology might be for building landers and rovers that can survive for long periods on Venus. This paragraph, describing the hardened chip that survived a simulated Venus environment for 60 days, highlights this:

A modern silicon chip can contain 7 billion transistors; each of the chips running in the Venus chamber has 175. Neudeck also uses an old-school transistor design, long since abandoned in conventional microelectronics. It’s basically a hyperexpensive, obtuse pocket calculator. But a pocket calculator running on Venus could be valuable indeed. “This is already the complexity of many of the early scientific missions flown back in the ’60s and ’70s,” Neudeck says, and more powerful than the chips on Apollo flight computers. “You really can do science.”

Exploring Venus is essential and necessary for us to truly understand how planets form and evolve. Developing technology that can survive that harsh environment is equally necessary, as it will make all future space exploration easier and more capable. This engineering work appears to be taking the first steps in this direction.

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New study says recurring dark streaks on Mars are from flowing sand, not water

9:49 am

The uncertainty of science: A new study has concluded that the recurring dark streaks on Martian slopes are caused not from flowing seeps of water but from small sand avalanches.

Continuing examination of these still-perplexing seasonal dark streaks with a powerful camera on NASA’s Mars Reconnaissance Orbiter (MRO) shows they exist only on slopes steep enough for dry grains to descend the way they do on faces of active dunes.

The findings published today in Nature Geoscience argue against the presence of enough liquid water for microbial life to thrive at these sites. However, exactly how these numerous flows begin and gradually grow has not yet been explained. Authors of the report propose possibilities that include involvement of small amounts of water, indicated by detection of hydrated salts observed at some of the flow sites.

The results do not exclude the possibility that water plays a part, but do suggest it plays a much smaller part, or none at all.

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Air Force to shift focus to smallsat constellations

8:54 am

The head of the the Air Force’s Strategic Command revealed this past weekend that he wants the military to quickly shift its focus to buying small satellite constellations.

As one of nine U.S. combatant commanders, Hyten has a say in how the Pentagon plans investments in new technology. With regard to military satellites, STRATCOM will advocate for a change away from “exquisite” costly systems that take years to develop in favor of “more resilient, more distributed capabilities.” This is the thinking of the new “space enterprise vision” adopted by the Air force and the National Reconnaissance Office, Hyten said. “That vision is about defending ourselves. In that vision you won’t find any of those big, exquisite, long-term satellites.”

“I’ve made a call at U.S. Strategic Command that we’ll embrace that as a vision of the future because I think it’s the correct one,” he added. STRATCOM will “drive requirements,” Hyten noted, “And, as a combatant commander, I won’t support the development any further of large, big, fat, juicy targets. I won’t support that,” he insisted. “We are going to go down a different path. And we have to go down that path quickly.”

Makes sense to me. Not only will the Air Force save money, but their satellite assets will be harder to attack and easier to sustain and replace should they be attacked.

For the satellite industry this shift will accelerate the growth of the smallsat industry, and provide a lot more business for the new smallsat rocket industry that is now emerging.

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ARCA issues statement after arrest of CEO

8:38 am

ARCA has issued a statement following the arrest last week of Dumitru Popescu for embezzlement and fraud.

ARCA Space Corporation will continue the development of its aerospace technology as scheduled. The company has full confidence in CEO Dumitru Popescu and expects him to lead the efforts. Mr. Popescu was charged in New Mexico state courts with alleged embezzlement and securities issues. However, Mr. Popescu maintains his innocence and expects to prevail in court proceedings.

Meanwhile the work of the company will proceed with a goal of presenting a successful aerospike rocket engine.

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Vector makes deal to launch from Vandenberg

11:06 pm

Capitalism in space: Smallsat rocket company Vector has made a deal with Harris Corporation to use its launch facilities at Vandenberg in California for future launches.

Vector now has arrangements to launch its rockets from Kennedy, from Wallops Island, from Alaska, from the new spaceport in Georgia, and now from Vandenberg. With the rocket designed small enough for easy transportation by truck around the country, this will give them the ability to reach a large variety of orbits while also maintaining a fast launch rate.

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Virgin Orbit’s LauncherOne wins Defense launch contract

10:53 pm

Capitalism in space: Virgin Orbit’s LauncherOne has won a contract to launch a Defense Department payload.

The details are vague, but the deal appears real. The article also suggests that Virgin Orbit is on schedule to complete its first launch next year.

Its carrier aircraft, a Boeing 747 that was formerly a passenger airliner for Virgin Atlantic, is currently in flight tests after undergoing modifications to accommodate the launch vehicle. A pathfinder version the rocket, meanwhile, has been shipped from the company’s factory in Long Beach, California to Mojave for testing, including static fire tests of both stages.

All evidence now suggests that my prediction one year ago that this Virgin company will make its first operational flight before Virgin Galactic’s SpaceShipTwo, despite being in development only six years, compared to the fourteen years SpaceShipTwo has been under development.

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Rocket Lab prepares for second test launch of Electron rocket

10:40 pm

Capitalism in space: Rocket Lab’s second test Electron rocket has arrived at the company’s New Zealand launch facility in preparation for the rocket’s second flight.

They hope after several weeks of check-out they will be able to announce a launch date. The launch, though intended entirely as a test, will still carry three commercial cubesats, which Rocket Lab hopes to place in orbit.

For the Google Lunar X-Prize contestant Moon Express this launch is critical. They must launch by the end of March to win the prize, and are dependent on Electron as their rocket.

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Launch by SpaceX of mysterious Zuma payload delayed indefinitely

10:30 pm

The expected Falcon 9 launch this past week of the mysterious Zuma government payload, built by Northrop Grumman but linked to no government agency, has been postponed indefinitely because of a fairing issue identified during testing for a different customer.

This delay also suggests that this may be an issue that will delay more than one launch, which could effect SpaceX’s effort to achieve 20 launches in 2017.

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Mars rover update: November 16, 2017

10:17 am

Summary: Curiosity does drill tests, crosses Vera Rubin Ridge. Opportunity finds evidence of either ice or wind scouring on rocks in Perseverance Valley.

Curiosity

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

Curiosity looks up Vera Rubin Ridge, Sol 1850

Since my last update on September 6, Curiosity has continued its travels up and across Vera Rubin Ridge, a geological bedding plain dubbed the Hematite Unit. The panorama above, created by reader Phil Veerkamp, shows the view looking up the ridge slope. If you click on it you can see the full resolution image, with lots of interesting geological details.

The panorama below, also created by Veerkamp, shows the view on Sol 1866, two weeks later, as the slope begins to flatten out and the distant foothills of Mount Sharp become visible. (If you click on the image you can see a very slightly reduced version of the full resolution panorama.) This image also shows the next change in geology. From orbit the Hematite Unit darkens suddenly at its higher altitudes, and Curiosity at this point was approaching that transition. The rover is now, on Sol 1876, sitting on that boundary, where they will spend a few days making observations before moving on.

Curiosity on the Hematite Unit, Sol 1866

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The image on the right shows Curiosity’s approximate position, about halfway across the Hematite Unit and with the rover’s approximate future route indicated, as shown in this October 3, 2016 press release.

In the two months since my last rover update the Curiosity engineering team has spent a lot of time imaging and studying the Hematite Unit. They have also spent a considerable amount of time doing new tests on the rover’s drill in an effort to get around its stuck feed mechanism in order to drill again. Only yesterday they took another series of close-up images of the drill in this continuing effort.

As indicated by the October 3 2016 press release, the rover still has a good way to go before it begins entering the distant canyons and large foothills. While they should leave the Hematite Unit and enter the Clay Unit beyond in only a few more months, I expect it will be at least a year before they pass through the Clay Unit and reach the much more spectacular Sulfate Unit, where the rover will explore at least one deep canyon as well as a recurring dark feature on a slope that scientists think might be a water seep.

Opportunity

For the context of Opportunity’s recent travels along the rim of Endeavour Crater, see my May 15, 2017 rover update.
» Read more

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Haze on Pluto lowers its global climate temperature 54º F

8:32 am

Using data collected during New Horizons’ fly-by, scientists have found that the planet’s atmosphere is 54º F colder than predicted, and from this they theorize that the presence of haze in that atmosphere is what cools it.

Pluto’s atmosphere is made mostly of nitrogen, with smaller amounts of compounds such as methane. High in the atmosphere — between 500 and 1,000 kilometres above the surface — sunlight triggers chemical reactions that transform some of these gases into solid hydrocarbon particles.

The particles then drift downward and, at around 350 kilometres above Pluto’s surface, clump with others to form long chemical chains. By the time they reach 200 kilometres’ altitude, the particles have transformed into thick layers of haze, which the New Horizons spacecraft saw dramatically blanketing Pluto.

Zhang and his colleagues compared the heating and cooling effects of the atmosphere’s gas molecules to those of its haze particles. Earlier studies have suggested that the presence of gas molecules, such as hydrogen cyanide, could help explain why Pluto’s atmosphere is so cold. But Zhang’s team found that including haze was the only way to get their model to match the temperatures that New Horizons measured as it flew by the dwarf planet.

This theory remains unproven. Moreover, there are other explanations proposed for the cold atmosphere by other scientists. It will take new instruments and future probes to resolve the question.

The post has been corrected. My math in calculating the conversion from Celsius to Fahrenheit was initially faulty. Thanks to reader Kirk for spotting the error.

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India and China to reduce launch costs

9:31 am

Capitalism in space: In response to the announcement by Chinese officials that they aim to reduce their launch costs in order to attract more commercial business, Indian officials announced that they plan to do the same in order to compete.

Interestingly, the reduced price that China revealed, $5,000 per kilogram, remains about twice that of SpaceX’s estimate per kilogram price for a launch using a reused first stage.

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NASA completes first high altitude supersonic test of Mars 2020 rover parachute

9:26 am

NASA successfully completed its first high altitude supersonic test of the parachute that the Mars 2020 rover will use as part of its landing operation.

The rocket carried the payload as high as about 32 miles (51 kilometers). Forty-two seconds later, at an altitude of 26 miles (42 kilometers) and a velocity of 1.8 times the speed of sound, the test conditions were met and the Mars parachute successfully deployed. Thirty-five minutes after launch, ASPIRE splashed down in the Atlantic Ocean about 34 miles (54 kilometers) southeast of Wallops Island. “Everything went according to plan or better than planned,” said Clark. “We not only proved that we could get our payload to the correct altitude and velocity conditions to best mimic a parachute deployment in the Martian atmosphere, but as an added bonus, we got to see our parachute in action as well.”

The parachute tested during this first flight was almost an exact copy of the parachute used to land NASA’s Mars Science Laboratory successfully on the Red Planet in 2012. Future tests will evaluate the performance of a strengthened parachute that could also be used in future Mars missions. The Mars 2020 team will use data from these tests to finalize the design for its mission.

There is a nice video of this test flight at the link.

At first glance one wonders why they need to do these tests, since the parachute system is going to be almost identical to the one used by Curiosity in 2012, and that worked perfectly. However, they really aren’t testing the parachute but the system to fly and test future parachutes at the high altitudes that mimic Martian conditions. With this test technology working and available, it will make it possible to test all kinds of parachute designs for use on Mars, even Rogollo hang-glider chutes.

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China successfully launches two satellites

8:43 am

China’s Long March 4C rocket successfully placed two satellites in orbit today, a weather satellite and a commercial data relay satellite.

This was China’s 11th launch in 2017, well below the 20 they achieved in 2016, the drop caused by two launch failures earlier this year that resulted in an almost four month pause in launches.

At present the race for the most launches in 2017 stands as follows:

17 Russia
16 SpaceX
11 China
10 Arianespace (Europe)
7 ULA
5 Japan
4 India
3 Orbital ATK

Overall, the United States leads with 26 launches, its most since 2000.

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Exploring one of Mars’ giant volcanoes

10:42 am

Master index

For the past two weeks JPL’s image site has been releasing a string of images taken by Mars Odyssey of the smallest of Mars’ four giant volcanoes.

Pavonis Mons is one of the three aligned Tharsis Volcanoes. The four Tharsis volcanoes are Ascreaus Mons, Pavonis Mons, Arsia Mons, and Olympus Mars. All four are shield type volcanoes. Shield volcanoes are formed by lava flows originating near or at the summit, building up layers upon layers of lava. The Hawaiian islands on Earth are shield volcanoes. The three aligned volcanoes are located along a topographic rise in the Tharsis region. Along this trend there are increased tectonic features and additional lava flows. Pavonis Mons is the smallest of the four volcanoes, rising 14km above the mean Mars surface level with a width of 375km. It has a complex summit caldera, with the smallest caldera deeper than the larger caldera. Like most shield volcanoes the surface has a low profile. In the case of Pavonis Mons the average slope is only 4 degrees.

The image on the right is the context image, annotated by me to show where all these images were taken. The images can accessed individually below.

Each of these images has some interesting geological features, such as collapses, lava tubes, faults, and flow features. Meanwhile, the central calderas are remarkable smooth, with only a few craters indicating their relatively young age.

The most fascinating geological fact gleaned from these images is that they reveal a larger geological trend that runs through all of the three aligned giant volcanoes to the east of Olympus Mons.

The linear and sinuous features mark the locations of lava tubes and graben that occur on both sides of the volcano along a regional trend that passes thru Pavonis Mons, Ascreaus Mons (to the north), and Arsia Mons (to the south).

This trend probably also indicates the fundamental geology that caused all three volcanoes to align as they have.

Arsia Mons is of particular interest in that water clouds form periodically above its western slope, where there is also evidence of past glaciation. Scientists strongly suspect that there is a lot of water ice trapped underground here, possibly inside the many lava tubes that meander down its slopes. These facts also suggest that this might be one of the first places humans go to live, when they finally go to live on Mars.

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Japan to make second launch attempt of world’s smallest orbital rocket

9:44 am

JAXA, Japan’s space agency, has announced that it will make a second launch attempt in December of what would be the world’s smallest orbital rocket.

The rocket, measuring 10 meters long and 50 cm in diameter, will carry a “micro-mini” satellite weighing about 3 kg developed by the University of Tokyo to collect imagery of the Earth’s surface.

The launch scheduled for Dec. 25 will feature the fifth rocket in the SS-520 series. The Japan Aerospace Exploration Agency (JAXA) is hoping small rockets made with commercially available components at low cost will help fuel the growing global demand for micro-mini satellites. JAXA used components found in home electronics and smartphones for the rocket, which is about the size of a utility pole.

The previous launch failed when vibrations during liftoff caused a short-circuit that cut off communications, forcing them to terminate the flight.

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Billionaire Yuri Milner considering funding mission to Enceladus

9:21 pm

Capitalism in space: Billionaire Yuri Milner, who already funds several astronomy projects aimed at interstellar travel, is now considering funding a planetary probe to the Saturn moon Enceladus.

At the moment all he is doing is holding workshops with scientists and engineers to see if such a mission can be done for an amount he can afford. Considering that Elon Musk’s first concept to send a private probe to Mars, before SpaceX existed, was stopped because of high launch costs, thus becoming the inspiration for SpaceX itself in order to lower those costs, Milner’s private effort might actually be affordable now.

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Next Dragon launch for NASA may fly using reused first stage

9:19 am

Capitalism in space: NASA revealed today that it is close to approving the use of a Falcon 9 reused first stage for the next Dragon cargo mission to ISS.

During a press conference at NASA’s Wallops Flight Facility here Nov. 10 about the launch of a Cygnus cargo mission to the ISS, a NASA manager said the agency would likely approve the use of a reused booster on that mission, designated SpX-13, assuming it clears an upcoming review. “We’re in the final stages of doing all those assessments,” Dan Hartman, ISS deputy program manager, said. SpaceX first requested to use a previously-flown booster for a cargo mission about a year ago. “On the NASA side, we’ve had a lot of major reviews.”

He said SpaceX itself had one more readiness review for the booster they’re planning to refly before deciding if they can use it for the SpX-13 mission, scheduled for launch Dec. 4. “If that comes back positive,” he said, “I’d say the chances are that we’ll be flying a reuse on SpX-13.”

It appears that about a year from now the use of reused boosters will have become completely normalized, with no one thinking anything unusual about their use. This, after almost a half century of old-school engineers and managers repeatedly saying such a thing made no sense and was impossible in terms of engineering and economics.

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Dream Chaser test vehicle flies again!

9:12 am

Capitalism in space: Sierra Nevada’s Dream Chaser test vehicle today completed its second glide test, the first since 2013, successfully gliding to a perfect landing after being dropped from a helicopter at an altitude of 10,000 feet.

Unlike the 2013 glide test, the landing gear worked perfectly. With two such tests under their belt, the company I think has demonstrated that the spacecraft will be able to execute a landing. Next comes the building and test flight of the actual spacecraft.

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A storm on Jupiter

10:09 am

A storm of Jupiter

Cool image time! The image above, reduced in resolution to post here, was taken during Juno’s ninth close fly-by of Jupiter in late October, and shows one particular storm swirl in the gas giant’s southern hemisphere.

The Juno team today highlighted an image taken during this fly-by of Jupiter’s entire southern hemisphere, but I find this close-up more interesting. Be sure to check out the full resolution version. It appears to me that the white swirls have risen up above the gold and blue regions, casting shadows down upon them.

Unfortunately, I cannot tell you the scale of this storm, as the release does not give any details, including where in the full hemisphere image it is located. I suspect, however, that it is large enough to likely cover the Earth.

Both the full hemisphere image and the image above were processed by citizen scientists Gerald Eichstädt and Seán Doran.

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Update on the development of Blue Origin’s orbital rocket New Glenn

9:36 am

Link here. The article provides a lot of interesting details about Blue Origin’s plans and status, including this tidbit about the New Glenn assembly facility, now expected to be finished by February 2018 at the latest:

The facility will largely be used to build the second and third stages for New Glenn, with Blue Origin actually planning to construct very few first stage boosters.

With each first stage booster planned to be reused up to 100 times, the factory will mainly concentrate on – and for large periods of time is only planned to – produce 2nd and 3rd stages. Mr. Henderson noted that once the first stage boosters are retrieved after flight, their storage will be managed across the refurbishment facility at LC-36 (capable of holding three or four boosters), the integration facility at LC-36 (also capable of holding “at least” three or four boosters), and the Merritt Island production facility (which can hold four boosters).

This would seemingly reveal that Blue Origin plans to rely on roughly only 12 first stage boosters at a time (once New Glenn is fully operational and recovery is “routine”), relying almost exclusively on booster recovery and refurbishment to maintain its first stage boosters manifest.

The article also notes the Blue Origin intends to always land its stages on a barge, and is about to finalize the purchase of that barge.

What I am puzzled about is the almost complete disappearance from the news of the company’s suborbital project, New Shepard. The last news story I’ve seen, from mid-September, said they hoped to resume test flights before the end of the year, with manned flights in 2018. Since then, however, there has been no updates, which makes me wonder if Blue Origin has decided to put that suborbital tourism project aside.

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