Rosetta flyby of Asteroid Steins, 5th September 2008 |
Rosetta flyby of Asteroid Steins, 5th September 2008 |
Jun 19 2008, 06:53 AM
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#1
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Member Group: Members Posts: 571 Joined: 20-April 05 From: Silesia Member No.: 299 |
Only 78 days to Stein encounter ! I can't believe I forgot about this event.
-------------------- Free software for planetary science (including Cassini Image Viewer).
http://members.tripod.com/petermasek/marinerall.html |
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Aug 4 2008, 12:20 PM
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#2
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Rover Driver Group: Members Posts: 1015 Joined: 4-March 04 Member No.: 47 |
Optical tracking has started (includes image of Steins, but doesn't seem real from the description...confusing)
http://www.esa.int/esaCP/SEMF0B8N9JF_index_0.html |
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Aug 4 2008, 01:09 PM
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#3
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Junior Member Group: Members Posts: 27 Joined: 13-July 08 Member No.: 4264 |
I am not sure what exactly is unclear, but let me try to be a bit more quantitative:
Today OSIRIS and the NAVCAM start to look at Steins for navigation purposes, twice a week for the first 3 weeks, than daily until and including Sept.4 Currently the astrometric accuracy from OSIRIS is about the same as the current knowledge of the position of the asteroid, the NAVCAM will reach that accuracy in about 3 weeks. The asteroid will be unresolved in both OSIRIS and NAVCAM during the whole navigation campaign. The hope is that after the last slot, the absolute position of Steins, perpendicular to the flight direction, will be known to about 2 km (compared to of the order of 100 km now). There are four slots for trajectory correction maneuovers, one mid-august, the others in the last days before closest approach. The slots will be used if at that point the flyby geometry can be significantly improved (predicted vs. planned flyby geometry). The parameters are the closest approach distance of 800 km and the passage through 0 phase angle. The astrometry will not much improve the knowledge of the position of the asteroid in flight direction (in other words distance). This corresponds to an uncertainty in the time of closest approach of roughly 10 seconds. |
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