Tag: spaceflight

Northrop Grumman’s first Pegasus launch delayed indefinitely

10:47 pm

The first launch of a Pegasus rocket following the completion of the sale of Orbital ATK to Northrop Grumman has been delayed indefinitely because of “off-nominal data” detected in the rocket.

The payload is a NASA climate research satellite dubbed ICON. The rocket and launch crew were on board the L1011 carrier plane on they way to the Pacific launch area for next week’s launch when they detected the issue and decided to return to California.

This is not the first problem with this particular Pegasus launch.

ICON’s launch has been delayed a year by a pair of concerns with its Pegasus launcher. Engineers wanted more time to inspect the Pegasus rocket motors after they were mishandled during shipment to Vandenberg, officials said. That pushed the launch back from June to December 2017, the next availability in the military-run range at Kwajalein.

Then managers decided to ground the mission to assess the reliability of bolt-cutters used to jettison the Pegasus rocket’s payload fairing and separate the satellite in orbit. Workers installed smaller bolts in the fairing and satellite separation mechanisms, a measure officials said will ensure the cutters do their jobs.

For Northrop Grumman this isn’t the best way to start its new rocket business, but better a delay than a failed launch.

4 comments

Curiosity finds methane fluctuates seasonally in Gale Crater

9:05 am

Seasonal methane on Mars

In its second significant science release yesterday (the first relating to the discovery of organics), the Curiosity science team revealed that they have found over almost three Martian years the amount of methane in the atmosphere appears to fluctuate seasonally. The graph on the right illustrates this change.

[The data] show methane rises from just above 0.2ppb in the northern hemisphere winter to a fraction over 0.6ppb in the summer. The team’s best explanation is that methane is seeping up from underground, perhaps from stored ices, and is then being released when surface soils are warmed.

The team cannot positively identify the origin of the methane, but the researchers think they can close down one particular mechanism for its production. This involves sunlight breaking up carbon-rich (organic) molecules that have fallen to the planet’s surface in meteorites.

The variation in ultraviolet light over the course of the seasons is not big enough to drive the scale of the change seen in the methane concentration, says Dr Webster. “We know the intensity of the Sun and this mechanism should produce only a 20% increase in methane during the summer, but we’re seeing it increase by a factor of three,” he explained.

The change could be caused by either a chemical or a biological process. At this time there is no way to determine which.

18 comments

Germany to do partial gravity experiments using Zero-G airplane

8:53 am

In what might be the first human experiments in partial gravity, Germany has hired the Zero-G airplane for a series of flights testing how humans react in such conditions.

In the Partial G Campaign, the pilots fly three special parabolic shapes. So instead of zero-g or microgravity, one quarter, half and three quarters of Earth’s gravity will still be present. Passengers on board will therefore experience one quarter, half or three quarters of their own body weight – depending on the trajectory,” explains Stang.

The goal of these flights is to see what effect partial gravity has on human muscle control.

For humans to be able to move around and interact with their environment, they require finely tuned muscle movements, to walk around or ensure a secure footing, for instance. Under partial gravity, in particular, they must be able to effectively control their muscles via their neural pathways. If we are unable to do so, the risk of stumbling is dramatically increased. This applies to both humans on Earth and astronauts in space. However, partial gravity conditions appear to influence this neuromuscular control in challenging situations, increasing the astronaut’s risk of stumbling. Researchers at the University of Freiburg are investigating why this is so. The results are intended to reduce the risk to astronaut safety during missions to other planets, thereby resolving a fundamental safety issue in human physiological space exploration.

This is better than nothing, but it seems to me to be the least important thing to study in partial gravity. The Apollo astronauts clearly demonstrated that humans can adapt their muscle movements to partial gravity. What we must instead learn is whether partial gravity will eliminate bone loss, loss of cardio-vascular conditioning, spinal changes, balance problems, and the vision damage, all of which have been found to occur in weighlessness.

At the same time, it is probably impossible to study any of these latter issues during a short parabolic vomit comet flight. The Germans are doing what they can. Unfortunately, they might be the only ones doing anything in this area.

One comment

Curiosity finds evidence of complex carbon molecules

11:40 am

In a study released today, the Curiosity science team announced that earlier drill samples revealed evidence of complex organic carbon molecules, the possible remains of past life.

To unlock organic molecules from the samples, the oven baked them to temperatures of between 600°C and 860°C—the range where a known contaminant disappeared—and fed the resulting fumes to a mass spectrometer, which can identify molecules by weight. The team picked up a welter of closely related organic signals reflecting dozens or hundreds of types of small carbon molecules, probably short rings and strands called aromatics and aliphatics, respectively. Only a few of the organic molecules, sulfur-bearing carbon rings called thiophenes, were abundant enough to be detected directly, Eigenbrode says.

The mass patterns looked like those generated on Earth by kerogen, a goopy fossil fuel building block that is found in rocks such as oil shale—a result the team tested by baking and breaking organic molecules in identical instruments on Earth, at Goddard. Kerogen is sometimes found with sulfur, which helps preserve it across billions of years; the Curiosity scientists think the sulfur compounds in their samples also explain the longevity of the Mars compounds.

Earth’s kerogen was formed when geologic forces compressed the ancient remains of algae and similar critters. It’s impossible to say whether ancient life explains the martian organics, however. Carbon-rich meteorites contain kerogenlike compounds, and constantly rain down on Mars. Or reactions driven by Mars’s ancient volcanoes could have formed the compounds from primordial carbon dioxide. Monica Grady, a planetary scientist at The Open University in Milton Keynes, U.K., believes the compounds somehow formed on Mars because she thinks it’s highly unlikely that the rover dug into a site where an ancient meteorite fell. She also notes that the signal was found at the base of an ancient lake, a potential catchment for life’s remains. “I suspect it’s geological. I hope it’s biological,” she says.

It must be emphasized once again that they have not found evidence of past life. What they have found are the types of molecules that are often left behind by life, but can also form without the presence of life.

This result, from past drillholes in the Murray Formation, explains however why Curiosity headed back downhill to do its most recent drill test.

Curiosity has one last tool to help the team find out: nine small cups containing a solvent that frees organic compounds bonded in rock, eliminating the need to break them apart—and potentially destroy them—at high temperatures. In December 2016, rover scientists were finally prepared to use one of the cups, but just then the mechanism to extend the rover’s drill stopped working reliably. The rover began exploring an iron-rich ridge, leaving the mudstone behind. In April, after engineers found a way to fix the drill problem, the team made the rare call to go backward, driving back down the ridge to the mudstone to drill its first sample in a year and half. If the oven and mass spectrometer reveal signs of organics in the sample, the team is likely to use a cup. “It’s getting so close I can taste it,” says Ashwin Vasavada, Curiosity’s project scientist at the Jet Propulsion Laboratory in Pasadena, California.

The newest drillhole sample has now entered the mass spectrometer. Stay tuned!

4 comments

Movie of Juno’s thirteenth fly-by of Jupiter

10:12 am

Cool image time. Mathematician and software programmer Gerald Eichstädt has released another movie using images from Juno’s thirteenth close fly-by of Jupiter.

I have embedded the movie below the fold. As he notes,

The movie covers two hours of this flyby in 125-fold time lapse, the time from 2018-05-24T04:41:00.000 to 2018-05-24T06:41:00.000. It is based on 27 of the JunoCam images taken during the flyby, and on spacecraft trajectory data provided via SPICE kernel files.

The view begins by looking down at the northern hemisphere, and gets to within 2,200 miles of the giant planet’s cloud tops.

» Read more

3 comments

Juno mission extended

3:31 pm

NASA has extended the Juno mission through 2022 in order to complete its planned science.

NASA has approved an update to Juno’s science operations until July 2021. This provides for an additional 41 months in orbit around Jupiter and will enable Juno to achieve its primary science objectives.Juno is in 53-day orbits rather than 14-day orbits as initially planned because of a concern about valves on the spacecraft’s fuel system. This longer orbit means that it will take more time to collect the needed science data.

An independent panel of experts confirmed in April that Juno is on track to achieve its science objectives and is already returning spectacular results.The Juno spacecraft and all instruments are healthy and operating nominally.

NASA has now funded Juno through FY 2022. The end of prime operations is now expected in July 2021, with data analysis and mission close-out activities continuing into 2022.

I will admit that though Juno is clearly learning a great deal about Jupiter, such as this story about lightning there, its larger orbit makes it difficult to track the gas giant cloud structures as they evolve. This is unfortunate.

Leave a comment

More problems for James Webb Space Telescope?

9:45 am

The impending release of an independent NASA review of the state of the James Webb Space Telescope project suggests that the project is faced with additional issues.

NASA is in the process of evaluating the report from the Independent Review Board chaired by Tom Young to assess the status of the James Webb Space Telescope (JWST). Established in March, the Board was due to submit its report on May 31. NASA said today that the Board has completed its work and briefed NASA. The report will be released later this month after NASA determines the impact on cost and schedule.

Thomas Zurbuchen, NASA Associate Administrator for the Science Mission Directorate, created the Webb Independent Review Board (WIRB) on March 27, the same day he announced another delay in the telescope’s launch. WIRB held its first meeting the next week.

For many years, JWST appeared to be on track for launch in October 2018 after a 2011 restructuring that followed a series of earlier cost overruns and schedule delays. Congress capped the development cost (not operations) at $8 billion in law. Pursuant to the 2005 NASA Authorization Act, if a program exceeds 30 percent of its baseline estimated cost, NASA must notify Congress and no money may be spent on it after 18 months from the time of that notification unless Congress reauthorizes it.

The project will not die, Congress will simply extend it with lots more money. That is how big NASA projects really function, to take as long as possible so that they can continue their real goal of providing pork barrel jobs in congressional districts.

4 comments

Aerojet Rocketdyne completes first rocket engine for DARPA’s quick launch rocket

9:32 am

Aerojet Rocketdyne has completed assembly of the first rocket engine for DARPA’s quick launch rocket, Phantom Express, being built by Boeing.

[The engine] can fly for 55 missions with servicing only every 10. To speed up turnarounds, the engines will be installed in a hinged nacelle for better access and the entire spacecraft will use an operations procedure similar to those developed for aircraft.

The first AR-22 engines will be used for daily hot-fire tests at Rocketdyne’s Stennis Space Center facility in Mississippi to demonstrate that it can handle multi-mission conditions and that the fast turnarounds are both feasible and practical. In addition, Rocketdyne says that the test information will help spaceplane builder Boeing to improve the Phantom Express ground infrastructure.

Boeing and Aerojet Rocketdyne both have it very sweet. They have gotten DARPA to fund the development of their own low-cost reusable rocket, while other private companies have to go it alone.

Still, it appears that Boeing is leveraging its engineering experience from building the X-37B for the Air Force for this project. Whether the company can expand the rocket’s customer base beyond the Air Force remains unclear.

Leave a comment

Northrop Grumman purchase of Orbital ATK approved

9:24 am

Capitalism in space: Northrop Grumman’s acquisition of Orbital ATK has been approved by the Federal Trade Commission.

With this purchase, the name Orbital ATK will recede into history. This division of Northrop Grumman will now be called Northrop Grumman Innovation Systems. Here at Behind the Black I will simple call it Northrop Grumman.

The FTC ruling carried with it one caveat:

As a condition for the approval of the merger, the company will have to supply solid rocket motors “on a non-discriminatory basis under specified circumstances,” the FTC ruled.

Ensuring competition in the solid rocket motors industry is a key issue for the Defense Department because only two manufacturers remain in the business, Orbital ATK and Aerojet Rocketdyne. The Air Force plans to acquire a new strategic intercontinental ballistic missile, the so-called Ground Based Strategic Deterrent, with Northrop Grumman and Boeing competing for the award. The intent was for both Orbital ATK and Aerojet to supply both prime contractors. The FTC decision requires Northrop Grumman to separate its solid rocket motors business with a firewall so it can continue to support Boeing.

It will be up to the Defense Department to ensure compliance with the firewall mandate.

It is unclear from the press report what this firewall accomplishes. It sounds like there was fear that Northrop Grumman would not have sold its solid rocket boosters to competitor Boeing, but I don’t see that happening. This acquisition was designed to put Northrop Grumman back in the rocket business just as that business is booming. Part of that business is selling solid rockets.

Either way, the company that David Thompson started in the early 1980s to challenge the big space companies, Orbital Sciences, has now completely vanished into one of those big space companies.

One comment

China offers big bucks to attract foreign science talent

9:10 am

Link here. In China’s recent push to build big science facilities, such as the giant radio telescope FAST, it has faced a shortage of qualified homegrown Chinese scientists to run those new facilities.

To solve this problem, China is now offering big bucks to any scientist, even foreigners, willing to move to China.

On 22 May, the Ministry of Science and Technology issued guidelines that encourage science ministries and commissions to consult foreign experts and attract non-Chinese to full-time positions within China. In a striking change, foreign scientists are now allowed to lead public research projects.

In the past decade, China has aimed to build up its scientific capacity by luring back some of the tens of thousands of Chinese scientists working abroad. The latest measures emphasize that non-Chinese talent is also welcome. Drafted in December 2017 but not previously made public, they are “a confirmation of things that have been going on for a while,” says Denis Simon, an expert on China’s science policy at Duke Kunshan University in China, a branch campus of the Durham, North Carolina–based Duke University.

Simon says foreign scientists are drawn by China’s increased spending on R&D, which is rising twice as fast as its economic growth. Increasingly ambitious big science projects, such as a massive particle accelerator now under study, are a lure as well, says Cao Cong, a science policy specialist at the University of Nottingham Ningbo in China, an affiliate of the U.K. university. The opportunity for foreign scientists to serve as principal investigators for publicly funded programs is a significant new incentive, says Liang Zheng, who studies science and technology policy at Tsinghua University in Beijing.

Of course, moving to a nation ruled under totalitarian communist rule has its drawbacks:

Relocating to China comes with challenges. Gibson teaches in English but needs Chinese language help handling administrative matters and grant applications. Restricted access to internet sites such as Google is also a hurdle. “My research and my teaching regularly rely on access to online resources and search platforms [that are] blocked in China, so this is an impediment to my work,” Gibson says. But he has found workarounds. China shut down many virtual private networks, which provide access to blocked overseas sites, but a few remain. “There’s a saying: ‘Everything in China is difficult, but nothing is impossible,’ which I think reflects the situation very accurately,” Gibson says.

I would also expect that any American who makes this move will face significant security problems with the U.S. government upon their return.

Leave a comment

Another intriguing pit on Mars

1:37 pm

pit on Mars

Cool image time! In the June release of images from the high resolution camera on Mars Reconnaissance Orbiter, I came across the image on the right, cropped slightly to post here, of a pit in a region dubbed Hephaestus Fossae that is located just at the margin of Mars’s vast northern plains.

Below and to the right is an annotated second image showing the area around this pit. If you click on it you can see the full resolution image, uncropped, and unannotated.

wider view of pit

The scale bar is based on the 25 centimeter per pixel scale provided at the image link. Based on this, this pit is only about ten to fifteen meters across, or 30 to 50 feet wide. The image webpage says the sun was 39 degrees above the horizon, with what they call a sun angle of 51 degrees. Based on these angles, the shadow on the floor of the pit suggests it is about the same depth, 30 to 50 feet.

The shadows suggest overhung walls. This, plus the presence of nearby aligned sinks, strongly suggests that there are extensive underground passages leading away from this pit.

For a caver on Earth to drop into a pit 30 to 50 feet deep is nowadays a trivial thing. You rig a rope (properly), put on your vertical system, and rappel in. When you want to leave you use that same vertical system to climb the rope, using mechanical cams that slide up the rope but will not slide down.

On Mars such a climb would be both easier and harder. The gravity is only one third that of Earth, but the lack of atmosphere means you must wear some form of spacesuit. Moreover, this system is not great for getting large amounts of gear up and down. Usually, people only bring what they can carry in a pack. To use this Martian pit as a habitat will require easier access, preferable by a wheeled vehicle that can drive in.

The pit’s location however is intriguing. The map below shows its location on a global map of Mars. This region is part of the Utopia Basin, the place with the second lowest elevation on Mars.
» Read more

7 comments

NASA administrator in talks about commercializing ISS

9:48 am

In a wide-ranging news article today, NASA administrator Jim Bridenstine revealed that the agency is in discussions with many private corporations about the possibility of privatizing ISS.

Bridenstine declined to name the companies that have expressed interest in managing the station, and said he was aware that companies may find it “hard to close the business case.” But he said there was still seven years to plan for the future of the station, and with the White House’s budget request “we have forced the conversation.”

Bridenstine’s approach to ISS’s future seems reasonable to me. At some point the federal government needs to face the station’s future, and now is a better time to do it then later.

The article however confirmed my generally meh opinion of Bridenstine. First, he reiterated his born-again new belief in human-caused global warming, a belief that seemed to arrive solely for him to gain the votes to get him confirmed in the Senate.

Second, he said this about LOP-G, NASA’s proposed international space station that would fly in lunar space.

Known as the Lunar Orbiting Platform Gateway, the system would be built by NASA in partnership with industry and its international partners, he said.

“I’ve met with a lot of leaders of space agencies from around the world,” he said. “There is a lot of interest in the Gateway in the lunar outpost because a lot of countries want to have access to the surface of the moon. And this can help them as well and they can help us. It helps expand the partnership that we’ve seen in low Earth orbit with the International Space Station.”

But the first element of the system wouldn’t be launched until 2021 or 2022, he said. [emphasis mine]

The highlighted words illustrate why Bridenstine seems like a lightweight to me. LOP-G might be flying near the Moon, but nothing about it will provide anyone any access to the lunar surface. Not only will it not be operational in any manner for more than a decade, at the soonest, but it doesn’t appear designed to make reaching the lunar surface any easier. Instead, it mostly seems designed to justify SLS and Orion, and provide that boondoggle a mission.

Still, Bridenstine has in the past been generally in favor of commercial space, and that position appears to be benefiting NASA’s commercial crew partners. Prior to Bridenstine’s arrival the decisions of NASA’s safety panel acted to repeatedly delay the launch of the manned capsules being built by SpaceX and Boeing. Now that safety panel seems to have seen the light, and is suddenly more confident in these capsules. I suspect Bridenstine might have had some influence here.

3 comments

Russia announces plans to build reusable rocket

9:17 am

I’ll believe it when I see it: Russia announced this week new plans to build a reusable smallsat rocket where the first stage would fly back and land vertically.

According to preliminary estimates, the reusable system will cut the cost of payload delivery by 1.5 or 2 times compared to traditional rockets. Every self-guided booster will be designed to fly 50 missions without replacement of its main engines burning a mix of cryogenic liquid oxygen and liquid methane. The system was expected to be based on mobile launchers and its maiden flight was scheduled for 2022, the FPI press release said.

If this project actually does happen, it will be because there has been a political shift within Russia’s government-run space industry. I suspect this because last week they cancelled plans to build a lightweight but expendable smaller version of Proton. Now they are aiming to build a reusable rocket instead. It appears that they have realized they need to cut their costs to compete, and the expendable Proton wasn’t doing it, while a reusable rocket might.

If this is true, then this is good news for Russia’s space future. At the same time, the slowness at which they have made this shift illustrates the disadvantage of their centralized government-run system. Instead of competition within Russia pushing many different independent companies to move forward quickly, all decisions must be made through political maneuvering within Roscosmos, a process that is always slower and more cumbersome.

One comment

New Horizons awakened to begin preparations for January 1 2019 flyby

9:07 am

The New Horizons engineering team has brought the spacecraft out of hibernation to begin preparations for its January 1 2019 flyby of Kuiper Belt object 2014 MU69, which they have dubbed Ultima Thule.

New Horizons will begin its approach phase of the MU69 flyby on August 16, 2018, when it will begin imaging MU69 and the area around it to begin acquiring data about the KBO and its surroundings. Also, New Horizons will look for potential debris that could pose a hazard to itself, such as moons or rings.

Should any potential dangers be found, New Horizons has four planned opportunities to make trajectory changes from early October to early December 2018. The backup trajectory has a distance from MU69 of 10,000 kilometers (around 6,200 miles). Using the backup trajectory would lead to less and/or lower-quality science data gathered due to the probe flying by MU69 further away than planned.

The approach phase will last from August 16 to December 24, 2018, after which the core phase will begin.

The core phase begins just one week before the flyby and continues until two days afterward. It contains the flyby and the majority of the data gathering.

Based on this schedule, we should begin to get some interesting pictures of Ultima Thule by the fall.

Leave a comment

China launches weather satellite

9:02 am

The juggernaut of China’s 2018 launch effort marches on, with the launch of a weather satellite today.

The article also notes that China will do at least two more June launches.

In June we can expect at least two other orbital launches from China. From Xichang, a Long March-3B/Y1 will launch of a new pair of navigation satellites and China is also preparing the launch of the PRSS-1 (Pakistan Remote Sensing Satellite) that will take place from the Taiyuan Satellite Launch Center using a Long March-2C/SMA, together with the PakTES-1 satellite.

The leaders in the 2018 launch standings:

17 China
11 SpaceX
5 Russia
5 ULA

This launch once again puts China in a tie with the U.S. in the national rankings, 17 launches each.

Leave a comment

Smallsat rocket company Firefly gets contract

8:56 am

Capitalism in space: The smallsat rocket company Firefly Aerospace had gotten a six-launch contract from Surrey Satellite Technology Limited (SSTL).

Firefly Aerospace, Inc. (Firefly), a developer of orbital launch vehicles for the small to medium satellite market, announced today the execution of a Launch Services Agreement (LSA) with Surrey Satellite Technology Limited (SSTL) for use of the Firefly Alpha launch vehicle.

“Firefly is pleased to enter into an LSA with SSTL to provide up to six Alpha launches from 2020 through 2022,” said Firefly CEO Dr. Tom Markusic. “The Alpha launch vehicle allows for deployment of SSTL satellites as a primary payload to their preferred orbit, rather than flying as a secondary payload on a larger launch vehicle.”

This company had been driven into bankruptcy by a Virgin Galactic lawsuit. It has now risen from the dead. Its rocket has not yet flown, but that it got a launch contract indicates some confidence in them by Surrey. The company says it will do the first launch late in 2019, and become operational by 2020.

One comment

Curiosity’s new drilling technique declared a success

1:15 pm

In order to bypass a failed feed mechanism in the rover’s drill, Curiosity’s engineering team has declared successful the new techniques they have developed for drilling and getting samples.

They had successfully completed a new drill hole two weeks ago, but are only now are satisfied that the new method for depositing samples in the laboratories will work.

This delivery method had already been successfully tested at JPL. But that’s here on Earth; on Mars, the thin, dry atmosphere provides very different conditions for powder falling out of the drill. “On Mars we have to try and estimate visually whether this is working, just by looking at images of how much powder falls out,” said John Michael Moorokian of JPL, the engineer who led development of the new sample delivery method. “We’re talking about as little as half a baby aspirin worth of sample.”

Too little powder, and the laboratories can’t provide accurate analyses. Too much, and it could overfill the instruments, clogging parts or contaminating future measurements. A successful test of the delivery method on May 22 led to even further improvements in the delivery technique.

Part of the challenge is that Curiosity’s drill is now permanently extended. That new configuration no longer gives it access to a special device that sieves and portions drilled samples in precise amounts. That device, called the Collection and Handling for In-Situ Martian Rock Analysis (CHIMRA), played an important role in delivering measured portions of sample to the laboratories inside the rover.

I suspect that they still need to do more tests, and that the new method of shaking off material from the drill itself will not always work. At the same time, it reopens the option of using the drill and getting samples from it, which is a very good thing.

Leave a comment

Boulder-sized asteroid discovered just before it hit Earth

8:59 am

The Catalina Sky Survey, designed to find asteroid with the potential of hitting the Earth, discovered a boulder-sized such asteroid this past weekend just hours before it burned up in the atmosphere.

Although there was not enough tracking data to make precise predictions ahead of time, a swath of possible locations was calculated stretching from Southern Africa, across the Indian Ocean, and onto New Guinea. Reports of a bright fireball above Botswana, Africa, early Saturday evening match up with the predicted trajectory for the asteroid. The asteroid entered Earth’s atmosphere at the high speed of 10 miles per second (38,000 mph, or 17 kilometers per second) at about 16:44 UTC (9:44 a.m. PDT, 12:44 p.m. EDT,6:44 p.m. local Botswana time) and disintegrated several miles above the surface, creating a bright fireball that lit up the evening sky. The event was witnessed by a number of observers and was caught on webcam video.

When it was first detected, the asteroid was nearly as far away as the Moon’s orbit, although that was not initially known. The asteroid appeared as a streak in the series of time-exposure images taken by the Catalina telescope . As is the case for all asteroid-hunting projects, the data were quickly sent to the Minor Planet Center in Cambridge, Massachusetts, which calculated a preliminary trajectory indicating the possibility of an Earth impact. The data were in turn sent to the Center for Near-Earth Object Studies (CNEOS) at NASA’s Jet Propulsion Laboratory in Pasadena, California, where the automated Scout system also found a high probability that the asteroid was on an impact trajectory. Automated alerts were sent out to the community of asteroid observers to obtain further observations, and to the Planetary Defense Coordination Office at NASA Headquarters in Washington. However, since the asteroid was determined to be so small and therefore harmless, no further impact alerts were issued by NASA.

The video at the link makes it appear that the asteroid has hit the ground, but that is not what happened.

Leave a comment

SpaceX successfully launches commercial satellite

10:17 pm

Capitalism in space: SpaceX has successfully launched a commercial satellite using a previously flown first stage.

They did not attempt to recover the used first stage as it was one of their older stages, which they are clearing out as they move to the final Block 5 version of the Falcon 9.

The top leaders in the 2018 launch race:

16 China
11 SpaceX
5 Russia
5 ULA

In the national standings the U.S. has moved back ahead of China, 17-16.

7 comments

Stratolaunch still lacks a launch vehicle

10:51 am

In a news interview today about their plans for the next year or so, the CEO of Stratolaunch danced around the lack of a committed and appropriate rocket to act as a second stage for the giant airplane.

At the first flight event, we are going to talk a little bit about what is our suite of product offerings in terms of launch vehicles. We haven’t really talked much about that up until this point, but once we get the plane flying, we want to reveal to everyone exactly what we’re talking about. We have talked about the Pegasus system [from Orbital ATK] and we are going to launch the Pegasus on our first launch. It’s a very small rocket, but it’s a very good rocket, very reliable, which is one of the reasons we want to launch that first.

But it’s a 50,000 pound rocket. This plane can carry 550,000 pounds, so it’s an undersized rocket for the capabilities we’re talking about.

They hope this first launch will occur by summer of this year.

Leave a comment

Reuseability lowers SpaceX launch price to $50 million

10:46 am

Capitalism in space: Reuseability lowers SpaceX launch price to $50 million.

The article is mostly about tonight’s commercial launch of an SES communications satellite. In it however it notes this comment by Musk:

SpaceX is in the process of flying and discarding older, less advanced Block 4 first stages to clear inventory – the company will likely fly just one more before moving its entire manifest to the Block 5 iteration, which CEO Elon Musk says can fly up to 10 times with minimal refurbishment between missions. Beyond that, the boosters could launch up to 100 times with moderate inspections and changes.

The next-generation vehicles feature improved reusability, upgraded thrust, retractable black landing legs that can reduce time between launches, a new black interstage and a slightly larger payload fairing, to name a few. It will also help SpaceX reduce costs from $60 million to about $50 million per launch, Musk said in May. [emphasis mine]

This price is about a third less than what both Arianespace and ULA have estimated they will charge for their new rockets, Ariane 6 and Vulcan respectively. This is also about half the price that the Russians had been charging for their Proton, which used to be the lowest price in town.

I’ll make a prediction: The drop in prices has only just begun.

11 comments

The upcoming Falcon Heavy schedule

10:31 pm

Link here. After the estimated October launch of an Air Force technology demonstration satellite, the next launch is a communications satellite for Saudi Arabia set for the December/January time frame.

After that there are no scheduled Falcon Heavy launches, though three companies, Intelsat, Viasat, and Inmarsat, have options for launches.

In related SpaceX news, the company came within 200 feet of catching one half of the fairing from last week’s launch. The picture of the fairing coming down by parachute is very cool, and indicates that SpaceX is very close to recovering them.

8 comments

Certain microbes survive in clean rooms by eating the cleaning fluids

10:51 pm

Researchers have found that the reason certain microbes seem to survive in all spacecraft clean rooms is that those microbes actually live off the very cleaning fluids used to scrub the rooms.

Despite extensive cleaning procedures, however, molecular genetic analyses show that the clean rooms harbor a diverse collection of microorganisms, or a spacecraft microbiome, that includes bacteria, archaea and fungi, explained Mogul. The Acinetobacter, a genus of bacteria, are among the dominant members of the spacecraft microbiome.

To figure out how the spacecraft microbiome survives in the cleanroom facilities, the research team analyzed several Acinetobacter strains that were originally isolated from the Mars Odyssey and Phoenix spacecraft facilities.

They found that under very nutrient-restricted conditions, most of the tested strains grew on and biodegraded the cleaning agents used during spacecraft assembly. The work showed that cultures grew on ethyl alcohol as a sole carbon source while displaying reasonable tolerances towards oxidative stress. This is important since oxidative stress is associated with desiccating and high radiation environments similar to Mars.

The tested strains were also able to biodegrade isopropyl alcohol and Kleenol 30, two other cleaning agents commonly used, with these products potentially serving as energy sources for the microbiome.

With this information, the space engineering community will be able to refine their clean room operations to eliminate these microbes so as to better sterilize spacecraft heading on life-seeking missions.

7 comments

Cubesats heading to Mars complete first course correction

10:46 pm

The two cubesats, MarCO-A and MarCO-B, that were launched with NASA’s InSight Mars lander, have both completed their first course corrections, the first ever done in interplanetary space by cubesats.

While MarCO-A corrected its course to Mars relatively smoothly, MarCO-B faced some unexpected challenges. Its maneuver was smaller due to a leaky thruster valve that engineers have been monitoring for the past several weeks. The leak creates small trajectory changes on its own. Engineers have factored in these nudges so that MarCO-B can still perform a trajectory correction maneuver. It will take several more weeks of tracking to refine these nudges so that MarCO-B can follow InSight on its cruise through space.

“We’re cautiously optimistic that MarCO-B can follow MarCO-A,” said Joel Krajewski of JPL, MarCO’s project manager. “But we wanted to take more time to understand the underlying issues before attempting the next course-correction maneuver.”

Once the MarCO team has analyzed data, they’ll know the size of follow-on maneuvers. Several more course corrections will be needed to reach the Red Planet.

Since these two cubesats are an engineering test, even MarCo-B’s fuel leak issue provides valuable information that will make future interplanetary missions more likely and viable.

One comment

The surface properties of 122 asteroids revealed

1:12 pm

Using archive data produced by the Wide-field Infrared Explorer telescope (WISE, renamed NEOWISE) astronomers have been able to estimate the surface properties of 122 small asteroids located in the asteroid belt.

“Using archived data from the NEOWISE mission and our previously derived shape models, we were able to create highly detailed thermophysical models of 122 main belt asteroids,” said Hanuš, lead author of the paper. “We now have a better idea of the properties of the surface regolith and show that small asteroids, as well as fast rotating asteroids, have little, if any, dust covering their surfaces.” (Regolith is the term for the broken rocks and dust on the surface.)

It could be difficult for fast-rotating asteroids to retain very fine regolith grains because their low gravity and high spin rates tend to fling small particles off their surfaces and into space. Also, it could be that fast-rotating asteroids do not experience large temperature changes because the sun’s rays are more rapidly distributed across their surfaces. That would reduce or prevent the thermal cracking of an asteroid’s surface material that could cause the generation of fine grains of regolith. [emphasis mine]

If this conclusion holds, it means that mining these asteroids might be much easier. Dust can be a big problem, as it can clog up equipment and interfere with operations. It also acts to hide the underlying material, making it harder to find the good stuff.

Leave a comment

Heavier astronauts more likely to have vision issues in zero-G

9:51 am

An analysis of the physical characteristics of astronauts who develop vision problems after long missions in weightlessness has found that heavier body weight increases the risk.

The research team examined data collected by NASA from astronauts who had made long-duration space flights (averaging 165 days). The data included the astronauts’ sex and pre-flight height, weight, waist and chest size, as well as information about post-flight eye changes. The findings were related to body weight, not body mass index. They found that none of the female astronauts analyzed—who weighed less than the males—returned to Earth with symptoms of SANS. To rule out sex differences as a cause for the disparity, the researchers also examined the men’s data separately. “Pre-flight weight, waist circumference and chest circumference were all significantly greater in those who developed either disc edema or choroidal folds. This was still true when only the male cohort was analyzed,” the researchers wrote. “The results from this study show a strong relationship between body weight and the development of ocular changes in space.”

That such small differences in weight can make such a difference suggests again that adding just a small amount of artificial gravity, rather than 1g, might mitigate these issues. No tests of this however have ever been done, mostly because the engineering is complex and expensive. For humans we would need to build a vessel large enough that any rotation would be unnoticed. If the vessel is small it must rotate faster and the body’s inner ear gets confused. However, if we only need to simulate a tiny amount of gravity the spin rate can be reduced, simplifying the engineering.

One comment

Dunes on Pluto?

9:14 am

Dunes on Pluto

Cool image time! Scientists reviewing images taken by New Horizons when it flew past Pluto in 2015 have discovered what appear to be dunes of methane on the icepack of nitrogen of Sputnik Planitia. The image on the right, cropped to post here, shows these dunes. You can see the full image if you click on it.

Following spatial analysis of the dunes and nearby wind streaks on the planet’s surface, as well as spectral and numerical modelling, scientists believe that sublimation (which converts solid nitrogen directly into a gas) results in sand-sized grains of methane being released into the environment.

These are then transported by Pluto’s moderate winds (which can reach between 30 and 40 kmh), with the border of the ice plain and mountain range providing the perfect location for such regular surface formations to appear.

The scientists also believe the undisturbed morphology of the dunes and their relationship with the underlying glacial ice suggests the features are likely to have been formed within the last 500,000 years, and possibly much more recently.

There remains a lot of uncertainty here. The features do look like dunes in the image, but it is also possible that other phenomenon not yet understood could have caused this pattern on the icepack surface. Also, the resolution of the image is not sufficient to really see detail at this level. A different process on the surface could be fooling our eyes.

Nonetheless, the scientists hypothesis makes sense, and fits the data known. It also demonstrates again that, even billions of miles from the Sun, in as alien an environment we can imagine, the planet Pluto is an active and complex place.

Leave a comment
1 … 289 290 291 292 293 … 482