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Kepler to run out of fuel in the coming months

After nine years of success, the Kepler space telescope is running out of fuel, which will force an end to the mission sometime in the next several months.

The Kepler team is planning to collect as much science data as possible in its remaining time and beam it back to Earth before the loss of the fuel-powered thrusters means that we can’t aim the spacecraft for data transfer. We even have plans to take some final calibration data with the last bit of fuel, if the opportunity presents itself.

Without a gas gauge, we have been monitoring the spacecraft for warning signs of low fuel— such as a drop in the fuel tank’s pressure and changes in the performance of the thrusters. But in the end, we only have an estimate – not precise knowledge. Taking these measurements helps us decide how long we can comfortably keep collecting scientific data.

They are doing a dance here. If they run out of fuel while collecting data, that data will be lost. If they stop collecting data too soon, however, to transmit it to Earth, they will not maximize the data obtained.

Meanwhile, the next exoplanet hunter, TESS, is scheduled for launch on April 16 on a Falcon 9 rocket.

Genesis cover

On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.

 

The print edition can be purchased at Amazon. from any other book seller, or direct from my ebook publisher, ebookit. The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.


The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
 

"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News

3 comments

  • Steve Earle

    Too bad they couldn’t get a refueling bot to it in time.

  • wodun

    Wonder if the orbital dynamics would work for an MEV mission. But then again, maybe they don’t want to extend the lifespan because that just times up money and manpower that could be devoted to whatever they want to do next.

  • Edward

    Kepler was looking at a limited area of the sky. Its mission was a bit different than the TESS mission, which will look at more sky but will emphasize the nearer stars over the more distant stars.

    The following Space News article is from January:
    http://spacenews.com/a-changing-of-the-guard-in-nasas-hunt-for-exoplanets/

    TESS, like Kepler, will look for exoplanets by detecting very small changes in brightness of stars as orbiting plans cross, or transit, their disks. But while Kepler initially examined a single, small area of the sky in an effort to determine the fraction of stars with planets, TESS will instead perform an all-sky survey, focused on the brightest stars nearest to Earth.

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