Philae Wakes Up! |
Philae Wakes Up! |
Jun 14 2015, 11:05 AM
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#31
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Senior Member Group: Members Posts: 2922 Joined: 14-February 06 From: Very close to the Pyrénées Mountains (France) Member No.: 682 |
Got the info from a Radio that CNES get a 2mn contact with Philae last nigth and 40 second of data.
Please take this info with due precautions waiting for confirmation before opening a new topic. http://tempsreel.nouvelobs.com/en-direct/a...-spatiales.html -------------------- |
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Jun 25 2015, 04:44 PM
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#32
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Senior Member Group: Members Posts: 4252 Joined: 17-January 05 Member No.: 152 |
That would be interesting. Toss in the dot product between the lander body's +z axis and the lander-orbiter vector, for ability to receive signals from the lander, and you've got something very interesting. I believe someone mentioned a roughly 60 deg transmission cone about z+. Perhaps scalbers can "point you in the right direction" for z+.
Of course this would be with the caveat that the +z axis direction is not known very well and may have changed since landing. There's also the caveat that the very local normal may not agree well with the normal determined from your shape model, and of course cliffs/boulders will block sun and communications. But a plot of these three indicators vs time (and perhaps their product) would be very cool to see since it would give an indication of when communication might be possible... |
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Jun 25 2015, 05:52 PM
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#33
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Senior Member Group: Members Posts: 1649 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
But a plot of these three indicators vs time (and perhaps their product) would be very cool to see since it would give an indication of when communication might be possible... Sounds pretty interesting. I do have the green dot at my estimated z axis location. However I may want to ask opinions about the latitude of Philae at its location. Also, do we know the longitude and (solar) hour angle of Philae when the CIVA mosiac was taken? My diurnal solar track, horizon, (and green dot) is presently assuming Philae is on the equator. Being over the edge of Hatmehit it may really be a somewhat southerly latitude. The ultimate would be if we can consider the shadow of Perihelion Cliff in the calculations, though this would only be relevant if Rosetta were to move in to higher north latitudes. -------------------- Steve [ my home page and planetary maps page ]
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