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Thread: ROSETTA TO DEPLOY LANDER, PHILEA, ON COMET 67P ON 12 NOVEMBER

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    Default ROSETTA TO DEPLOY LANDER, PHILEA, ON COMET 67P ON 12 NOVEMBER

    Philea on 67P

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    Last edited by greenieadi; 12th November 2014 at 03:33 PM.

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    Default Re: ROSETTA TO DEPLOY LANDER, PHILEA, ON COMET 67P ON 12 NOVEMBER

    1.49pm

    Good morning from the European Space Operations Centre, ESA’s mission control in Darmstadt, Germany. Today, ESA attempt to land on comet 69P/Churyumov-Gerasimenko.

    This is the first time a landing on a comet has ever been attempted. It is a risky mission. This blog will run live all day following the action. You can also follow me on Twitter for additional updates.


    - from the guardian.com live blog
    Last edited by greenieadi; 12th November 2014 at 03:43 PM.

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    Default Re: ROSETTA TO DEPLOY LANDER, PHILEA, ON COMET 67P ON 12 NOVEMBER

    2.10pm

    Overnight there have been two more go/nogo decisions. Both were ‘go’ but the Philae lander team needed an additional hour before they confirmed that they were indeed ‘good to go’.

    The reason for the delay has not yet been confirmed but there was a computer glitch in Philae when it was switched on 24 hours earlier. Read more about that here.

    Rosetta were pronounced ready at 00:00GMT. Philae’s confirmation came at 02:35GMT.

    A fourth and final go/nogo takes place sometime between 6:35 and 7:35GMT this morning. If Rosetta and Philae are pronounced good to go at this point, the landing attempt will take place today.

    - from the guardian.com live blog
    Last edited by greenieadi; 12th November 2014 at 03:43 PM.

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    Default Re: ROSETTA TO DEPLOY LANDER, PHILEA, ON COMET 67P ON 12 NOVEMBER

    2.28pm

    Sometime in the next hour, Rosetta will perform the ‘pre-separation manoeuvre’. This is a thruster burn to place it on course for the separation point, when it will release Philae.

    The burn is expected to last about 6 minutes. It will alter Rosetta’s velocity by about 0.46m/s and send it heading in towards the comet.

    The fourth and final go/nogo will determine whether the burn has taken place successfully and Rosetta is on the right track. It will also make a final assessment of the two spacecraft, the ground stations, the ground systems and the teams. All must be ready for landing.

    Following separation, Rosetta will manoeuvre again to move away from the comet, but keeping Philae and the landing site in view.

    - from the guardian.com live blog
    Last edited by greenieadi; 12th November 2014 at 03:43 PM.

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    Default Re: ROSETTA TO DEPLOY LANDER, PHILEA, ON COMET 67P ON 12 NOVEMBER

    2.57pm

    The landing has just become riskier. The cold gas thruster appears not to be working on Philae. This thruster is on top of the lander and is designed to push the spacecraft onto the comet as the harpoons and drills anchor Philae to the surface. Without the thruster, the risk of Philae bouncing off the surface is increased.

    The truster problem is the reason for the delay in last night’s third go/nogo. At one point, Paolo Ferri, Head of Mission Operations, European Space Agency, ESOC, said that it looked as if the third go would not be given. When the confirmation came, it was an hour later than originally planned.

    All other systems on the lander are working as expected. Philae must now depend upon three screws to drill the legs into the surface, and two harpoons that it will fire into the comet as well.

    - from the guardian.com live blog
    Last edited by greenieadi; 12th November 2014 at 03:43 PM.

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    Default Re: ROSETTA TO DEPLOY LANDER, PHILEA, ON COMET 67P ON 12 NOVEMBER

    3.08pm

    The landing attempt happens today for sure

    The fourth go/nogo has just been called. It is a ‘go’. The landing attempt is happening today for certain.

    - from the guardian.com live blog
    Last edited by greenieadi; 12th November 2014 at 03:43 PM.

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    Default Re: ROSETTA TO DEPLOY LANDER, PHILEA, ON COMET 67P ON 12 NOVEMBER

    3.20pm

    About three decades ago, Rosetta began as an idea for a mission that would bring a sample back from a comet. That proved too expensive. So, according to Gerhard Schwehm, Former Rosetta Project Scientist, they decided that if they couldn’t bring comet samples back to a laboratory, they would build a laboratory to send to a comet. The result is Rosetta. The laboratory is Philae. It lands today.

    - from the guardian.com live blog
    Last edited by greenieadi; 12th November 2014 at 03:44 PM.

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    Default Re: ROSETTA TO DEPLOY LANDER, PHILEA, ON COMET 67P ON 12 NOVEMBER

    Philae lander separation 0830 GMT
    Last edited by greenieadi; 12th November 2014 at 04:47 PM.

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    Default Re: ROSETTA TO DEPLOY LANDER, PHILEA, ON COMET 67P ON 12 NOVEMBER

    Lander successfully seperated. Descending & landing....in 7 hours time
    Last edited by greenieadi; 12th November 2014 at 05:08 PM.

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    Default Re: ROSETTA TO DEPLOY LANDER, PHILEA, ON COMET 67P ON 12 NOVEMBER

    http://edition.cnn.com/2014/11/12/wo...own/index.html

    London (CNN) -- The comet probe Philae may have bounced when it landed, the European Space Agency (ESA) said Wednesday.
    It is the first time a soft landing has been achieved on a comet -- but there was a hitch.
    Comet 67P has a very weak gravity, so anchoring harpoons were designed to shoot into the comet to fix the spacecraft to the surface. They failed to fire and Philae is not firmly secure, ESA says.
    Philae lander manager Stephan Ulamec said the probe may have lifted off again and turned.
    Rosetta team celebrates landing
    Rosetta: The comet chaser


    Comet landing an 'engineering miracle'
    Lander snaps goodbye picture of Rosetta
    "So maybe we didn't land once -- we landed twice," he told a news conference.
    A good photo's 45% you, 45% practice & 10% equipment. A bad photo share the same ratio.

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