CE-2 flyby of Toutatis |
CE-2 flyby of Toutatis |
Aug 25 2012, 04:27 PM
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
I thought it was time to split the subject from the Moon forum.
Admins, can you move the relevant messages here? anyway, just out: an interesting blog article by Bill Gray explaining how he recovered the probe and how he computed the orbit yielding the 13 December flyby date Chang'e 2: The Full Story |
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Oct 7 2012, 08:37 AM
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#2
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
I have got a copy of this paper presented at last week's IAF Congress
Low energy trajectory optimization for CE-2’s extended mission after 2012 I will not share the paper, but I can tell you something more about the Toutatis flyby - first of all: 13 December 2012 is confirmed as the date. no distance nor relative speed or other details are given - we are told that the Beijing Aerospace Control Center called for proposals on a mission beyond L2 in January 2012. - there were lots of interesting proposals including one that would flyby Earth and Moon repeatedly, visit the L1 and L2 Lagrangian points, flyby a hundred-meter sized asteroid and finally explore the L4 Sun-Earth point in 2017 (the paper states that CE-2 would have been the first mission to do so. I think one of the two Stereos was first) - in March 2012 the Toutatis flyby, proposed by the Chinese Academy of Space Technology was selected - in a non-optimized form, the mission would have cost 107.5 m/s of the remaining 120 m/s delta-v budget - a 6.2 m/s correction on 15 April "was mainly used to keep the Lissajous trajectory". it was previously reported as the date CE-2 was maneuvered out of the L2 halo orbit - trajectory optimization was only carried out starting on 16 April. After optimization, an additional 22 m/s delta-v was gained that could be used to ensure a successful flyby - the first targeting maneuver was carried out on 31 May (32.9 m/s) - the second targeting maneuver (46.5 m/s) was to be carried out on 24 September |
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