Tag: spaceflight

Phobos-Grunt due to crash to Earth anytime in the next ten hours

9:00 am

path of Phobos-Grunt's reentry

Updated and bumped. An updated prediction from Aerospace now calls for Phobos-Grunt to come down sometime between 9 and 3 pm (Eastern). This puts the U.S. now out of danger, though Europe, South America, Africa, Australia, and the southern half of Asia all remain in the spacecraft’s path.

Watch your heads! Phobos-Grunt is due to crash to Earth anytime in the next ten hours. And unfortunately, this new prediction has it flying over both North America and much of Europe and Africa during that time period.

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NASA is soliciting private aerospace companies to bid on building their designs for rocket upper stage that will send the Orion capsule beyond Earth orbit.

10:47 pm

NASA is soliciting private aerospace companies to bid on building their own designs for the rocket upper stage that will send the Orion capsule beyond Earth orbit.

This is good news: Rather than design the upper stage themselves, NASA is behaving like a customer and looking for someone else to provide them the product, much as the agency has been doing in buying from private companies crew and cargo services for ISS. Using this approach the agency is more likely to get its upper stage quickly and at less cost.

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Engineers have gone to a back up radio system on Cassini after a primary unit did not respond as expected in late December.

11:58 pm

Engineers have gone to a back up radio system on Cassini after a primary unit did not respond as expected in late December.

The cause is still under investigation, but age may be a factor. The spacecraft launched in 1997 and has orbited Saturn since 2004. Cassini completed its prime mission in 2008 and has had two additional mission extensions. This is the first time its ultra-stable oscillator has had an issue.

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Phobos-Grunt’s reentry this weekend

9:20 am

path of Phobos-Grunt's reentry

Watch your head this weekend: The re-entry of Phobos-Grunt has been refined, and is expected to come down sometime between 5 pm (Eastern), Saturday January 14 and 9 am (Eastern), Monday January 16.

As you can see by the image on the right, there is as yet no way to predict where it will land, though it appears that — except for the tip of Florida — North America is in the clear. The blue lines show its orbital path during the first half of this window, while the yellow lines show its path during the window’s second half.

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SpaceX outlines its new design goals for Falcon 9

9:09 pm

What competition brings: SpaceX outlines its new design goals for Falcon 9 and its Merlin rocket engine.

[U]pcoming upgrades to the engine (Merlin 1D) will provide a vast improvement in performance, reliability and manufacturability – all of which could provide a timely boost to aiding the potential for success for the fully reusable Falcon 9.

Increased reliability: Simplified design by eliminating components and sub-assemblies. Increased fatigue life. Increased chamber and nozzle thermal margins,” noted SpaceX in listing the improvements in work.

Improved Performance: Thrust increased from 95,000 lbf (sea level) to 140,000 lbf (sea level). Added throttle capability for range from 70-100 percent. Currently, it is necessary to shut off two engines during ascent. The Merlin 1D will make it possible to throttle all engines. Structure was removed from the engine to make it lighter.

Improved Manufacturability: Simplified design to use lower cost manufacturing techniques. Reduced touch labor and parts count. Increased in-house production at SpaceX.

That’s just the engine. Most of the article however talks about the company’s effort to make as much of Falcon 9 reusable as possible. Hat tip to Clark Lindsey.

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Phobos-Grunt is now expected to fall to Earth sometime around January 16

9:29 am

It’s official: Phobos-Grunt is now expected to fall to Earth sometime around January 16.

Meanwhile, the head of the Russian space agency is looking for a scapegoat for his country’s recent space failures.

Roskosmos chief Vladimir Popovkin told the Izvestia daily he could not understand why several launches went awry at precisely the moment the spacecraft were travelling through areas invisible to Russian radar. “It is unclear why our setbacks often occur when the vessels are travelling through what for Russia is the ‘dark’ side of the Earth — in areas where we do not see the craft and do not receive its telemetry readings,” he said. “I do not want to blame anyone, but today there are some very powerful countermeasures that can be used against spacecraft whose use we cannot exclude,” Popovkin told the daily.

With leadership like this, Russia might soon join the U.S. as a country unable to get astronauts into space.

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After 16 years in space, NASA’s Rossi X-ray Timing Explorer (RXTE) has been shut down

5:16 pm

After 16 years in space, NASA’s Rossi X-ray Timing Explorer (RXTE) has finally been shut down.

RXTE far exceeded its original science goals and leaves astronomers with a scientific bounty for years to come. Data from the mission have resulted in more than 2,200 papers in refereed journals, 92 doctoral theses, and more than 1,000 rapid notifications alerting astronomers around the globe to new astronomical activity.

“The spacecraft and its instruments had been showing their age, and in the end RXTE had accomplished everything we put it up there to do, and much more,” said Tod Strohmayer, RXTE project scientist at Goddard. The decision to decommission RXTE followed the recommendations of a 2010 review board tasked to evaluate and rank each of NASA’s operating astrophysics missions.

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Researchers in California have produced a cheap plastic capable of removing large amounts of carbon dioxide from the air.

4:06 pm

Researchers in California have produced a cheap plastic capable of removing large amounts of carbon dioxide from the air.

The article focuses on how this could save us from global warming. What I see is a possible tool for making the construction of interplanetary spaceships more practical. On any vessel in space, something has to cleanse the air of carbon dioxide. Finding a cheap way to do this makes building those vessels much easier.

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Studying the Moon by starlight

10:34 am

The Moon's south pole by starlight

In a paper published today in the Journal for Geophysical Research, Planets, the science team for Lunar Reconnaissance Orbiter describe how they have used starlight to peer into the permanently shadowed craters of the Moon’s north and south poles. Looking only during the lunar night, they measured the dim albedo of the Moon from reflected starlight. From this very weak signal they were able to cull two interesting facts about these very cold and very dark places.

  • The ground at the bottom of these craters is more porous than the surrounding unshadowed terrain.
  • There is evidence in the spectroscopy of 1 to 2% water frost in these craters.

» Read more

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A fitting memorial

3:13 pm

Greeley Haven

Opportunity has settled into its winter haven.

NASA’s Mars Exploration Rover Opportunity will spend the next few months during the coldest part of Martian winter at Greeley Haven, an outcrop of rock on Mars recently named informally to honor Ronald Greeley, Arizona State University Regents’ professor of planetary geology, who died October 27, 2011.

I met and interviewed Greeley a number of times in writing articles for magazines like Sky & Telescope and Astronomy. For years he was a central figure in the field of planetary geology, and his life effort is one of the prime reasons the United States has dominated this field for most of the past half century, with a fleet of planetary missions presently at Mercury, Mars, Jupiter, Saturn, and Pluto, with many more to come.

The article notes that the International Astronomical Union (IAU) has the job of naming objects in space, and could take years to honor Greeley. I say that if these scientists, the true explorers of Mars, want to name something for him, then they should go ahead, and future generations should honor that choice, regardless of what the IAU says.

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ArianeSpace will make a profit in 2011, the first time in three years

1:15 pm

ArianeSpace will make a profit in 2011, the first time in three years.

Helped by the two Soyuz campaigns, which occurred in October and December, Arianespace in 2011 apparently averted a third consecutive year of losses. Its financial accounts are not finalized until June, but Le Gall said the company expects to report a slight profit on about 985 million euros in revenue.

In other words, it was the addition of the Russian low-cost Soyuz rocket to their fleet that helped avoid another year’s loss. This doesn’t reflect well on the profitability of the Ariane 5 rocket.

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A NASA inquiry into the ownership of a variety of space artifacts, including Jim Lovell’s Apollo 13 checklist, has halted their sale at auction.

10:56 am

Power grab: A NASA inquiry into the ownership of a variety of space artifacts, including Jim Lovell’s Apollo 13 checklist, has halted their sale at auction.

In other words, it appears that NASA management has decided that everything ever built by NASA belongs to NASA, forever, even if NASA would have thrown it away at some point.

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China issues a white paper on space, outlining its future goals

9:46 am

China today issued a white paper on space, outlining its future goals. In addition to additional launches of its manned Shenzhou manned capsule,

China also plans to launch space laboratories, manned spaceship and space freighters, and will start a research on the preliminary plan for a human landing on the moon, the document said.

As an important part of deep-space exploration, the country’s lunar probe projects follow the idea of “three steps” — orbiting, landing and returning. In next five years, the country plans to launch orbiters for lunar soft landing, roving and surveying to implement the second stage of lunar exploration, then it will start the third-stage project of sampling the moon’s surface matters and get those samples back to Earth, the white paper said.

You can download the full white paper here [pdf]. Hat tip to Spaceref.com.

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