CE-2 flyby of Toutatis |
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CE-2 flyby of Toutatis |
 Jan 19 2013, 10:12 AM
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#136
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Junior Member  Group: Members Posts: 29 Joined: 18-July 05 Member No.: 439  |
QUOTE (Phil Stooke @ Jan 19 2013, 03:39 AM)  That's interesting: (1) Revised flyby timeline, shifted some 5 seconds against the 15 Dec images; (2) Authors claim to calculate distances from asteroid size, not from times; (3) Yet again time intervals between images are too small to fit the pairs of distances. |
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Jan 19 2013, 10:14 AM
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#137
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 Senior Member Group: Members Posts: 1146 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
and here is the image sequence. the complete sequence should include something more than a hundred images resolving Toutatis
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-------------------- I'm one of the most durable and fervent advocates of space exploration, but my take is that we could do it robotically at far less cost and far greater quantity and quality of results.
James Van Allen |
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Jan 20 2013, 09:43 AM
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#138
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Senior Member Group: Members Posts: 1146 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
Daniel Fischer (cosmos4u on twitter) has published this regression graph of the distances and times in the prez. they seem to make quite some sense
-------------------- I'm one of the most durable and fervent advocates of space exploration, but my take is that we could do it robotically at far less cost and far greater quantity and quality of results.
James Van Allen |
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Jan 20 2013, 12:36 PM
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#139
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 Member Group: Members Posts: 555 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
This is composite image from last four published images (with highest resolution).
Resolution is ~4.5 m/pix.
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Jan 20 2013, 03:16 PM
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#140
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 Member Group: Members Posts: 879 Joined: 30-January 05 Member No.: 162 |
Thanx for the composite image!
The 'divot' (lower right) is even more interesting at this resolution; the grooves, or scratchesif you will, are parallel to each other and to the sides. |
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Jan 21 2013, 12:41 AM
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#141
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 Senior Member Group: Members Posts: 1153 Joined: 25-November 04 Member No.: 114 |
Excellent work!
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Jan 22 2013, 05:54 PM
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#142
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Senior Member Group: Members Posts: 1146 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
I got a copy of the video that was embedded in the SBAG presentation from the author (hint: her address is on the first slide)
I will not redistribute it, but here are some of the frames. note that the quality and compression seem a lot better than we have seen until now
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-------------------- I'm one of the most durable and fervent advocates of space exploration, but my take is that we could do it robotically at far less cost and far greater quantity and quality of results.
James Van Allen |
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Mar 2 2013, 10:07 AM
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#143
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Senior Member Group: Members Posts: 1146 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
QUOTE (Paolo @ Dec 23 2012, 11:26 AM) just found a paper (marked "for academic exchange only") that gives some technical overview of the asteroid flyby target selection that paper has now been published in a proper peer-reviewed journal: Near-Earth asteroid flyby trajectories from the Sun–Earth L2 for Chang’e-2’s extended flight -------------------- I'm one of the most durable and fervent advocates of space exploration, but my take is that we could do it robotically at far less cost and far greater quantity and quality of results.
James Van Allen |
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Apr 28 2013, 12:56 PM
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#144
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Senior Member Group: Members Posts: 1146 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
papers to be presented at the Beijing IAF congress in September:
Relative Distance Estimation Between the Asteroid 4179 and Chang'E II Based On Spaceborne Opitcal Images Combined Orbit Determination for CE-2 and Toutatis Based on Optical Imaging Data at Fly-by -------------------- I'm one of the most durable and fervent advocates of space exploration, but my take is that we could do it robotically at far less cost and far greater quantity and quality of results.
James Van Allen |
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Lo-Fi Version | Time is now: 20th May 2013 - 05:47 AM |
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