Tag: spaceflight

Enceladus flyby images begin arriving

10:38 am

Enceladus

Cool image time! The first images from Cassini’s close flyby of Saturn’s moon Enceladus on Wednesday have started to arrive.

None have yet been processed, though the press release above provided a distant view of the moon’s plumes as the spacecraft approached. The image on the right, showing the moon itself, is one of the flyby I pulled off from the raw image website. Expect some interesting views to appear there throughout the day, with a more detailed press release tomorrow.

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Yutu still operational after two years

8:15 am

Despite an inability to move, China’s rover Yutu has now set the longevity operational record for rover on the Moon.

Yutu was deployed and landed on the moon via China’s Chang’e-3 lunar probe in 2013, staying longer than the Soviet Union’s 1970 moon rover Lunokhod 1, which spent 11 months on the moon. Its operations have streamed live through Sina Weibo, a Chinese microblogging site, and its Weibo account has nearly 600,000 followers.

Yutu experienced a mechanical control abnormality in 2014, but it was revived within a month and, though it is unable to move, it continues to collect data, send and receive signals, and record images and video.

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Oxygen in Comet 67P/C-G coma

8:38 am

The uncertainty of science: Unexpectedly scientists using Rosetta data have discovered oxygen in the coma of Comet 67P/C-G.

It was not immediately clear where the oxygen came from. The team discovered that water and oxygen were often found together — an indication that similar processes released both molecules. But Bieler and his colleagues ruled out many scenarios in which oxygen arises as a by-product when energetic particles such as photons and electrons split apart water. Instead, the researchers argue that the oxygen is a remnant from when 67P formed billions of years ago, a process that may have trapped the gas in small grains of ice and rock that coalesced to create the comet’s solid core.

But many models of the early Solar System rule this out because most oxygen tends to pair off with hydrogen. Given this affinity, it is tricky to adjust models of the early Solar System to allow for the survival of gaseous O2, says Mike A’Hearn, an astronomer at the University of Maryland in College Park and a co-investigator on Alice. But he adds that it may be possible with the right chemical abundances and temperature conditions.

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Comet 67P/C-G has passed peak brightness

9:31 am

Using both ground-based and Rosetta observations scientists have now measured when the comet reached its peak brightness as well as how much material it lost during this orbit’s closest approach to the Sun.

Based on Rosetta’s pre-perihelion measurements that indicate the dust:gas ratio was approximately 4 , that means roughly 80% of the material being lost is dust, with the rest dominated by water, CO, and CO2 ices. (Note: at the time of that blog post an estimate of 3 was made for perihelion, but the actual data has yet to be analysed.) In any case, using 3 and 4 respectively, the total mass loss rate at its peak is likely in the range of about 100,000–115,000 tonnes per day.

Of course, that’s not a huge amount compared to the comet’s overall mass of around 10 billion tonnes. But nevertheless, a very simple calculation reveals that if, for example, the comet lost that much mass continuously for 100 days, it would correspond to roughly 0.4-0.5 metres of its surface being removed in that time.

In other words, the surface lost about 1.5 feet during close approach.

Peak brightness occurred near the end of August, and has been declining since.

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Russia’s ten-year space policy delayed again

9:22 am

The competition heats up: The completion of Russia’s much delayed ten-year space policy plan, originally planned for last year and then planned for November, has likely been delayed again.

The program was supposed to be submitted to the government for approval late last year, but the collapse of the ruble, ongoing launch failures and related mishaps, leadership shakeups at the federal space agency, and an industry-wide reform plan have all conspired to delay the final draft. A draft was expected this summer, but in March a senior Roscosmos official was quoted by the TASS news agency as saying that the proposal had already been significantly altered, and “looks completely different” than it did when originally completed in 2014. The biggest change to the draft was the level of funding dedicated to Russian space exploration over the 10-year period from 2016 to 2025, which was reduced by 10 percent between drafts to 3.4 trillion rubles ($52.5 billion).

Just like the Soviet era’s many repeated five-year plans, expect the goals of this policy statement, once announced, to fail repeatedly. They will have some initial success, but in the end this top-down government program, like NASA’s SLS, will have more to do with creating non-productive jobs than actually building spaceships and rockets.

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ULA shuffles and trims its executive leadership

9:11 am

The competition heats up: In its effort to improve its efficiency and lower costs, ULA shuffled and reduced the size of its executive team.

All these changes are under the leadership of the company’s CEO Tory Bruno, who took over in 2014 with the goal of cutting what company charges for a launch while speeding up its launch prep times. The effort to launch three Atlas 5s in this month is clearly the result of this policy.

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Early Apollo rover prototype sold for scrap

9:00 am

An early test prototype of the Apollo lunar rovers, apparently parked in an Alabama backyard for decades, was sold for scrap and lost when the estate of its owner was liquidated.

“It has come to the attention of the Marshall Space Flight Center historian that you may be in the possession of a prototype of a Lunar Roving Vehicle,” NASA wrote to the buggy’s owner in an August 2014 letter requesting that the LRV be turned over. “Returning the vehicle to the Marshall Space Flight Center would allow MSFC to restore [it] so it might be used for historical and educational purposes.”

Unfortunately, the letter arrived too late. “Upon contacting the current owner,” NASA’s Office of the Inspector General reported in December, “we learned the LRV had been sold for scrap after [redacted] had passed away.”

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Buy the first computer to fly in space!

8:51 am

The first digital RAM computer memory chip to fly in space is up for auction and you can buy it.

As part of its Space Exploration Signature Auction, Heritage Auctions is taking bids for a vintage random access, non-destructive readout 4,096 bit memory plane that flew on Gemini 3. This ferric memory unit was an integral part of the Gemini Spacecraft Computer, which was the first computer installed in a manned space capsule.

Gemini 3 was the first manned Gemini mission and completed 3 orbits on March 23, 1965. The auction goes through November 3, and bidding is presently at $2,000.

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Dawn begins descent to final orbit around Ceres

8:33 pm

Engineers have fired up Dawn’s ion engine and have begun lowering the spacecraft’s orbit downward.

The spacecraft is now on its way to the final orbit of the mission, called the low-altitude mapping orbit. Dawn will spend more than seven weeks descending to this vantage point, which will be less than 235 miles (380 kilometers) from the surface of Ceres. In mid-December, Dawn will begin taking observations from this orbit, including images at a resolution of 120 feet (35 meters) per pixel.

They’ve also released a nice mosaic showing the double bright spots in Occator Crater as well as the surrounding terrain.

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Lockheed Martin ready to build Orion?

6:08 pm

O joy! After more than a decade of design work, costing billions, Lockheed Martin now says it is ready to begin building the first Orion capsule for eventual launch only 8 years from now!

“The vast majority of Orion’s design is over, and now we will only change things when new requirements come into play,” said Michael Hawes, Lockheed Martin Orion vice president and program manager. “Considering the incredible complexity of this spacecraft, the team is very proud to have successfully completed the design review and is looking forward to seeing it fly.”

For those who don’t detect my sarcasm, I find this project more than absurd. Bush proposed Orion in 2004. Lockheed has been spending billions for years just designing it. In about six to eight years from now they might finally get one capsule completed for launch in 2023, almost two decades after it was first proposed.

Two decades to build one capsule! With a cost in the billions. Let these facts sink in for a bit and then ask yourself: Why are we spending money on this pork project that will never fly?

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Worldview tests subscale prototype of its balloon and capsule

5:59 pm

The competition heats up: Worldview, the company planning to sell tickets for high-altitude tourist flights to the edge of space, successfully completed this weekend a test flight of a 10-percent scale prototype of its capsule and balloon.

The balloon reached an altitude just over 100,000 feet, just under 19 miles. The capsule then separated and landed safely using a parafoil. This success keeps them on schedule for their first commercial flights in 2017.

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Pluto’s meandering canyons

8:52 am

canyons of Pluto

Cool image time! In scrolling through the new raw images downloaded from New Horizons today I came across an image, one of several, that showed what clearly appeared to be meandering canyons carved by flowing liquid.

To show it here, I have cropped it and reduced its size somewhat, highlighting the most interesting features. As you can see, the largest canyon not only appears to have a dark floor, it cuts right through an older crater. Smaller canyons do the same thing. In addition, many of the craters seem to be ponded with the same dark material that floors the canyons, while some of the smaller canyons show tributaries that come together, just like rivers. Are these flows of liquid nitrogen?

I eagerly await the conclusions of the scientists, who are probably only slightly less baffled by these features as I am.

Be sure and check out the full image, as well as the other raw images. The data continue to come in from New Horizons, but the science team is no longer under the same kind of public pressure to make announcements or hold press conferences. There are gems hidden there that are worth looking at, even if they are not as yet accompanied by any scientific analysis.

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NASA to decide on 2nd cargo contracts Nov 5

9:40 am

The competition heats up: NASA will announce the two contract winners for its second round of ISS cargo contracts on November 5.

If it was up to me to pick the two winners from the four companies bidding, SpaceX, Boeing, Orbital ATK, and Sierra Nevada, I would go with Orbital ATK and Sierra Nevada. SpaceX and Boeing already have contracts to ferry crews to ISS with their Dragon and Starliner capsules. By picking Orbital ATK’s Cygnus capsule and Sierra Nevada’s Dream Chaser reusable mini-shuttle, NASA would then have four different ways to get payloads to ISS.

Sadly, the decision is not up to me. It is more likely NASA will pick SpaceX and Boeing. Boeing especially is likely to get picked because they are an established big player with lots of capital and influence.

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A detailed update on the Falcon 9 return-to-flight

9:21 am

Link here. It appears that SpaceX hopes to complete the following launches in quick order::

1. November 24: First Falcon 9 upgrade launch: 11 Orbcomm low-orbit satellites
2. December 15: Last old Falcon 9 launch: Jason 3
3. December 27: Second Falcon 9 upgrade launch: SES-9 geosynchronous communications satellite
4. Early January: Third Falcon 9 upgrade launch: Dragon and the Bigelow BEAM inflatable module to ISS

All these dates are of course subject to delays. Launches 1 and 3 will definitely attempt vertical landings of the first stage on a barge.

The main point of the article above was to note that the SpaceX is now ready to do a full thrust test firing of the first stage that will be used in the November 24 launch, doing that test at its McGregor, Texas, test facility. As noted, “All Falcon stages pass through the Texas site, allowing them to be fired up and tested for any issues prior to continuing their journey to the launch site.” The article then described one case where the testing successfully spotted an issue that was fixed prior to launch.

I think this speaks volumes about the robustness of SpaceX’s manufacturing process. Their rockets are built in one place, shipped to another for testing, and then shipped to a third for launch. And all within mere weeks. This robustness also suggests that the rocket’s first stage will be able to withstand its vertical landing and be able to be reused, as planned.

The article also provides some further insights in why the company switched the SES-9 and Orbcomm launches.

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Pluto in 3D

9:09 am

The New Horizons science team has released its first 3D image of the surface of Pluto.

You need red/blue stereo glasses to view it.

The image shows an ancient, heavily cratered region of Pluto, dotted with low hills and cut by deep fractures, which indicate extension of Pluto’s crust. Analysis of these stereo images shows that the steep fracture in the upper left of the image is about 1 mile (1.6 kilometers) deep, and the craters in the lower right part of the image are up to 1.3 miles (2.1 km) deep. Smallest visible details are about 0.4 miles (0.6 kilometers) across.

My impression of the image, using the glasses, makes me wonder if they have exaggerated the vertical depth so that it would stand out. The craters look more like pits than craters. And if they didn’t exaggerate the vertical depth, then that means that impacts on Pluto produce craters that are very different than those seen in the inner solar system.

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