Rosetta-Philae landing
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Thread: Rosetta-Philae landing

  1. #1
    1000+ Posts gerry freed's Avatar
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    Default Rosetta-Philae landing

    A largely French vehicle is about to land on a comet 510 million kilometres from us. Watch it live at
    GP - En direct : Atterrissage de Philae - CNES
    data stream 4.
    Live is relative as it takes 28 minutes for the signal to get here.
    Happy landings!

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    1000+ Posts okalford's Avatar
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    Amazing! Thanks for posting the link Gerry.

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    Interesting.

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    1000+ Posts michaelr's Avatar
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    Could be a rocky landing. Hope it has hydropneumatics.
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    Almost down on the surface now!

    http://new.livestream.com/esa/cometlanding

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    well, what a complete joke.
    gerry's link failed completely, and the livestream website is showing nothing other than the effing control room, AND cant even load that.

    live update!:
    so now the liveupdate is working, it is nothing but people holding microphones congratulating themselves, but no video anywhere of the actual landing.

    live update #2.
    oh i finally get it. the 'live' coverage doesnt actually involve any images. it is only live coverage of people on Earth, watching screens, and space exploration version of the Eurovision Song Contest award ceremony.
    Last edited by alexander; 13th November 2014 at 04:43 AM.

  7. #7
    1000+ Posts gerry freed's Avatar
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    The vehicle has landed which proves that there is some intelligence on earth.
    The images are not currently available.
    Although the lander is down it has some problems and the team working on it are not prioritising the impatience of the earthling audience.
    It takes 28 mins for signals to be received and at that distance of 500 million kilometres and a low powered transmitter the bandwidth is limited, so the data is slow to arrive. One cannot do any simple error correction by asking for retransmission as it takes another 28 minutes to send back a message.
    It has a central memory which carries all the data and images and is intended to send them immediately back home. The problem is that the lander has not stabilised its position properly, which was to be done with two harpoon grapnels. There is also some concern about the orientation of the solar cells. In these circumstances the on board computer gives priority to the technical data in the transmission sequence and the images are pushed back. It is likely that with its instability the first pictures are useless anyway.
    The space agency site is up but the video feed has stopped and will restart when firm information from the Toulouse control centre is available.
    The data is being relayed by the Deep Space Communication Centre in Canberra.
    The effective weight of this washing machine sized lander on the surface is about a gram and so landing is not about strong suspension but about holding it in place after touchdown. If the experiments on board that press into the surface are actuated and it is not tied down, the odds are that it will float off into space and be lost.
    Last edited by gerry freed; 13th November 2014 at 07:52 AM.
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    1000+ Posts gerry freed's Avatar
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    They now think that when it landed it bounced up again and weighing only a gram it took two hours to land again. It is now down and anchored.
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    yes it is a fine achievement, but there was, in fact, nothing to watch live or otherwise, other than the control room staff and the ensuing love-fest which, as noted, was conducted like the Eurovision.

    that said, when images are available, they will be most interesting.
    Last edited by alexander; 13th November 2014 at 08:19 AM.

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    Quote Originally Posted by gerry freed View Post
    They now think that when it landed it bounced up again and weighing only a gram it took two hours to land again. It is now down and anchored.
    lucky they put the extra gram of mass in it!
    talk about close....

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    JBN
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    Quote Originally Posted by gerry freed View Post
    The data is being relayed by the Deep Space Communication Centre in Canberra.
    That in itself should add considerably to the 28 minute delay.

    The Canberra day begins at about 10:00 am, so maybe some more news will filter through.

    John

  12. #12
    1000+ Posts gerry freed's Avatar
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    they have retracted last report - it is landed again but not anchored
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    The landing and the precision was an excellent achievement , but the proof of the achievement will be in the ability of the lander to carry out the series of experiments, advance our knowledge and thus justify the money spent on getting it into place. Hopefully it will solve some of the great unknowns in the birth and evolution of our own planet.

    thanks for the link Gerry.

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    1000+ Posts mr bern's Avatar
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    Quaint that it's an "atterrissage" ...
    MY15 208GTi

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    1000+ Posts robmac's Avatar
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    Sounds like it needs some "revolutionary" batteries which are being discussed / trolled in other forum threads.
    It's very disappointing to see it in hibernate mode so soon.

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    1000+ Posts mr bern's Avatar
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    Fair go -- it was designed and built over a decade ago, and assembled (I'm sure) as Neil Armstrong allegedly alleged while he was sitting on top of just such a vehicle on its launch pad, from 50,000 lowest-bids ...
    MY15 208GTi

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    1000+ Posts gerry freed's Avatar
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    Quote Originally Posted by mr bern View Post
    Quaint that it's an "atterrissage" ...
    Yes, but seaplanes land on water.
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