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: 1154 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
Attached thumbnail(s)
-------------------- 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: 1154 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: 557 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.
Attached thumbnail(s)
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Jan 20 2013, 03:16 PM
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#140
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 Member Group: Members Posts: 881 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: 1154 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
Attached thumbnail(s)
-------------------- 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: 1154 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: 1154 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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Jun 8 2013, 01:01 PM
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#145
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Senior Member Group: Members Posts: 1154 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
the latest issue (5 2013) of SCIENCE CHINA Technological Sciences http://tech.scichina.com:8082/sciE/CN/volumn/current.shtml has a bunch of papers (in Chinese) on the CE-2 flyby of Toutatis.
nothing yet on the English version of the journal http://tech.scichina.com:8082/sciEe/EN/volumn/current.shtml -------------------- 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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Jun 8 2013, 01:11 PM
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#146
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Senior Member Group: Members Posts: 4587 Joined: 5-April 05 From: Canada Member No.: 227 |
The first one is a summary of the CE2 mission with some Moon images. Two more on the trajectory, navigation etc., but not actually anything on the Toutatis observations yet. Unless I missed something.
Phil -------------------- ... because the Solar System ain't gonna map itself.
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Jun 8 2013, 01:16 PM
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#147
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Senior Member Group: Members Posts: 1154 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
you are right.
one of the papers (the one on page 478) seem to describe how they determined the flyby distance from the monitoring camera images -------------------- 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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Yesterday, 05:18 AM
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#148
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Senior Member Group: Members Posts: 1154 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
still more papers in the 8 June issue of the journal
tech.scichina.com:8082/sciE/CN/volumn/volumn_6667.shtml from a quick look, they seem to be mostly engineering papers -------------------- 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 June 2013 - 05:38 AM |
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