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Rosetta comet chaser completes "big burn"

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    #272
    space2ground1
    Registered Users Posts: 547 ✭✭✭space2ground1


    Same here. I'm hoping the plan is to squeeze every but if science in and then use the last of the power to try for a jump and see where it might land. If it spent over an hour off the surface when it landed the first time at approx .5m/s, who knows how far it might travel into a more illuminated area. Worth the shot? Maybe they're playing the long game to see will the orbit give the panels more of a chance in the months to come. Either way.. What a little gem of a machine. The Honda 50 of space exploration :)


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    #273
    brevity
    Registered Users Posts: 8,522 ✭✭✭brevity


    https://twitter.com/BadAstronomer/status/533418255248281601

    https://twitter.com/esaoperations/status/533420848691298304


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    #274
    Mickeroo
    Administrators, Computer Games Moderators, Sports Moderators Posts: 32,247 Admin ✭✭✭✭✭Mickeroo


    expectationlost wrote: »
    using boards.ie beta, tried the boards.ie new beta, it show the twitter embeds but chose before not to use it because its too bright

    You can change it to a dark theme, much easier on the eyes. :)

    Delighted to hear she got what she needed, anything else will be a bonus now.


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    #275
    expectationlost
    Registered Users Posts: 11,824 ✭✭✭✭expectationlost


    Mickeroo wrote: »
    You can change it to a dark theme, much easier on the eyes. :)

    Delighted to hear she got what she needed, anything else will be a bonus now.

    only skin that made twitters embeds work was white new beta, tried grey didn't work


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    #276
    shedweller
    Closed Accounts Posts: 4,029 ✭✭✭shedweller


    Lad on sky news now and he's saying it's more or less done for now. The batteries appear to be dead but there may be some charging going on. Will know more when rosetta comes around.
    Also said we have until march before it gets too hot and Philae cooks to death! So 67p better start changing its ways and let us get on with some more science, dammit!
    Roll on the data download from rosetta!


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    #277
    Duggy747
    Registered Users Posts: 13,295 ✭✭✭✭Duggy747


    Good night sweet prince, for now.

    Looking forward to seeing what data they got.


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    #278
    yipeeeee
    Closed Accounts Posts: 1,605 ✭✭✭yipeeeee


    What I want to know is when is the programme on discovery channel!!

    Love them programmes.


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    #279
    shedweller
    Closed Accounts Posts: 4,029 ✭✭✭shedweller


    Doesn't appear to be much new news yet. Did all the data make it home?


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    #280
    brevity
    Registered Users Posts: 8,522 ✭✭✭brevity


    This twitter account is very good for information...

    https://twitter.com/Philae_MUPUS


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    #281
    Discodog
    Registered Users Posts: 15,882 ✭✭✭✭Discodog


    BBC4 9pm Sunday Sky at Night Rosetta Special


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    #282
    expectationlost
    Registered Users Posts: 11,824 ✭✭✭✭expectationlost


    is it secure, any chance it might fall off?


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    #283
    shedweller
    Closed Accounts Posts: 4,029 ✭✭✭shedweller


    expectationlost wrote: »
    is it secure, any chane it might fall off?
    Not now with its dead batteries anyway. Maybe when the comet livens up nearer the sun it might get blown around a little from geysers.
    Then it might get some rays on its solar panels!
    Philae just might have a second life...wouldn't that be something special!


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    #284
    Captain Chaos
    Registered Users Posts: 11,174 ✭✭✭✭Captain Chaos


    It only has a few months to live anyway. By March the comet will become so hot it will start to cook Philae.


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    #285
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 91,400 Mod ✭✭✭✭Capt'n Midnight


    space2ground1 wrote: »
    Either way.. What a little gem of a machine. The Honda 50 of space exploration :)
    That description might be more appropriat to the Indian probe orbiting Mars.

    Hopefully it's gets more light or moved into the light before it gets too hot.


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    #286
    philstar
    Banned (with Prison Access) Posts: 2,986 ✭✭✭philstar


    Discodog wrote: »
    BBC4 9pm Sunday Sky at Night Rosetta Special

    that lady presenter is very enthusiastic and as a result talks too fast :confused:


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    #287
    yipeeeee
    Closed Accounts Posts: 1,605 ✭✭✭yipeeeee


    philstar wrote: »
    that lady presenter is very enthusiastic and as a result talks too fast :confused:

    Missed it dam.

    Just realised I have sky at night on auto record for each episode!!

    Gonna watch it now, sweet.


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    #288
    Hmmzis
    Registered Users Posts: 2,004 ✭✭✭Hmmzis


    Holymoly, dodn't know the mupus hammer got broken by the comet surface. :eek: That's some very hard surface.
    Makes it even more interesting to find out what that comet is made of. Can't wait for the science results.


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    #289
    space2ground1
    Registered Users Posts: 547 ✭✭✭space2ground1


    Hmmzis wrote: »
    Holymoly, dodn't know the mupus hammer got broken by the comet surface. :eek: That's some very hard surface.
    Makes it even more interesting to find out what that comet is made of. Can't wait for the science results.

    It explains the bounce anyway. Had the harpoons fired they wouldn't have worked. It'll be interesting to see can they figure out why the harpoons didn't fire and why the thruster failed.


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    #290
    Iwannahurl
    Closed Accounts Posts: 8,156 ✭✭✭Iwannahurl


    space2ground1 wrote: »
    It explains the bounce anyway. Had the harpoons fired they wouldn't have worked. It'll be interesting to see can they figure out why the harpoons didn't fire and why the thruster failed.


    I'm not aware of any official or scientific sources for this, but the word on the web is that the harpoons were to be fired using nitrocellulose, aka good old-fashioned guncotton.

    Lander_Harpoon_410.jpg

    Reportedly, nitrocellulose does not work in vacuum or near-vacuum conditions.

    http://www.wired.com/2013/10/in-space-no-one-can-hear-your-nitrocellulose-explode/

    It remains to be seen whether that is cited or accepted as the official reason for the harpoon failure.


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    #291
    josip
    Registered Users Posts: 13,911 ✭✭✭✭josip


    philstar wrote: »
    that lady presenter is very enthusiastic and as a result talks too fast :confused:

    I started watching halfway through and I thought they'd sped up the footage and it was some kind of humourus clip.
    Her head movements were also in sync with her speech. It was like she was living life according to a different clock to the rest of us.
    Very disconcerting to watch/listen to.


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    #292
    Iwannahurl
    Closed Accounts Posts: 8,156 ✭✭✭Iwannahurl


    Confirmation that the harpoon anchoring system depended on nitrocellulose: http://www.esmats.eu/esmatspapers/pastpapers/pdfs/2003/thiel.pdf
    The design of the Anchoring System is governed by extraordinary requirements arising from its outstanding importance for the success of the mission, from a long cruise phase of more than ten years, low temperatures (-160 ... -190°C) and from strict power and mass restrictions (1.5 kg subsystem mass). To meet these requirements several sub-units had to be either specifically developed or optimized for this application and numerous development tests had to be performed.
    The Anchoring System developed at the Max-Planck-Institut für extraterrestrische Physik is ready to serve as a safe and reliable anchoring device for the ROSETTA Lander.

    It could be verified that the system can be operated under extreme environmental conditions and is capable of anchoring in a wide range of different materials. Moreover the suitability of the Anchoring Harpoon as a scientific instrument to perform penetrometry measurements could be demonstrated by a large number of test shots.

    Thus the system could as well be a valuable contribution to other planetary missions, either as an anchoring device or as a scientific instrument.

    harpuneneinheit-600x428.jpg

    Was the anchoring system tested in space?


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    #293
    Iwannahurl
    Closed Accounts Posts: 8,156 ✭✭✭Iwannahurl


    The Rosetta/Philae harpoon anchoring system was tested.

    In July 2014.

    On Earth.

    Oberpfaffenhofen, Germany, to be precise: http://www.stern.de/wissen/kosmos/raumsonde-rosetta-harpunen-test-fuer-erste-landung-auf-kometen-2127350.html


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    #294
    space2ground1
    Registered Users Posts: 547 ✭✭✭space2ground1


    Iwannahurl wrote: »
    I'm not aware of any official or scientific sources for this

    Really interesting stuff! Here's where I got the info on the harpoons failure to fire.. https://twitter.com/esaoperations/status/532575061543485440

    Thanks for the other links! Fascinating!


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    #295
    Iwannahurl
    Closed Accounts Posts: 8,156 ✭✭✭Iwannahurl


    Curiouser and curiouser.

    NASA have known for the past 40 years that nitrocellulose is not suitable for deep space missions: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19740005551.pdf


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    #296
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 91,400 Mod ✭✭✭✭Capt'n Midnight


    it should still work as a monopropellant as long as the nozzle keeps the chamber pressure over the threshold for deflagration

    if it was being used as a gun type propellant then the chamber pressure would be well enough


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    #297
    shedweller
    Closed Accounts Posts: 4,029 ✭✭✭shedweller


    A good old fashioned spring would have done a better job than that nitrocellulose!
    Anyway, it wont change anything now. Just have to wait on the science.


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    #298
    jumbobreakfast
    Registered Users Posts: 1,143 ✭✭✭jumbobreakfast


    Could the thruster and harpoon have been affected by cosmic rays?

    This rosetta mission is exciting but has a depressing tinge. It's taken 20 years to barely land on an object inside our solar system whcih makes me wonder if we'll ever survive long enough as a species to get off this planet.


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    #299
    Captain Chaos
    Registered Users Posts: 11,174 ✭✭✭✭Captain Chaos


    At times it makes me wonder how the US put 12 people on the moon and got them all back using 1960's technology.


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    #300
    Harold Finchs Machine
    Closed Accounts Posts: 76 ✭✭Harold Finchs Machine


    Captain Chaos wrote: »
    At times it makes me wonder how the US put 12 people on the moon and got them all back using 1960's technology.

    Are you saying it didn't happen?:D


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    #301
    mrbrianj
    Registered Users Posts: 384 ✭✭mrbrianj


    Captain Chaos wrote: »
    At times it makes me wonder how the US put 12 people on the moon and got them all back using 1960's technology.

    LSD


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