CE-2 flyby of Toutatis |
CE-2 flyby of Toutatis |
 Aug 25 2012, 04:27 PM
Post
#1
|
|
 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 |
 |
 
|
 |
|
Dec 14 2012, 08:05 PM
Post
#2
|
|
|
Solar System Cartographer Group: Members Posts: 10258 Joined: 5-April 05 From: Canada Member No.: 227 |
That's because of the bizarre geometry of radar images. Imagine looking out over a range of hills with peaks at varying distances. Now imagine they are semi-transparent so you can see hills behind other hills. At the radar limb in these images, that is what we are seeing. The geometry is totally different from visible images. But with many images the ambiguities can be resolved - which is what this is all about, and why the Chinese images will be really useful. We have never had both high resolution radar and (reasonable resolution) visible imaging for any object before.
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
|
|
|
|
Dec 14 2012, 09:04 PM
Post
#3
|
|
 Interplanetary Dumpster Diver Group: Admin Posts: 4405 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
Assuming it is better than the 2002 NY40 images, this could be significant.
-------------------- |
|
|
|
Paolo CE-2 flyby of Toutatis Aug 25 2012, 04:27 PM
Paolo a few more observations of Chang'e 2 (designat... Aug 27 2012, 10:02 AM TheAnt Interesting story thank you for sharing.
Mr Gray ... Sep 1 2012, 10:03 PM
rlorenz I don't suppose they'll rename the spacecr... Sep 1 2012, 10:19 PM Paolo I have got a copy of this paper presented at last ... Oct 7 2012, 08:37 AM tolis According to JPL's HORIZONS ephemeris service,... Oct 10 2012, 01:45 PM Paolo I saw it in November 1996 using a small, 114 mm te... Oct 10 2012, 03:15 PM tolis QUOTE (Paolo @ Oct 10 2012, 04:15 PM) I s... Oct 12 2012, 10:22 AM Paolo today on arXiv: Composition of Near-Earth Asteroid... Oct 11 2012, 07:00 AM Paolo to answer Phil Stooke's question in another th... Oct 28 2012, 08:43 AM Phil Stooke Excellent - thanks for this.
Phil Oct 28 2012, 01:38 PM Tom Tamlyn The link to Bill Gray's August 25 planetary.or... Oct 28 2012, 03:49 PM Paolo just tweeted by @asrivkin at the AGU meeting
QUOT... Dec 5 2012, 06:29 PM Phil Stooke Check out this e-poster from the current AGU meeti... Dec 5 2012, 07:10 PM Paolo I saw it. It's a pity that 2 pics will not be ... Dec 5 2012, 07:20 PM Phil Stooke No, but radar does that very well.
Phil Dec 5 2012, 07:51 PM Paolo speaking of which, the first radar image of the 20... Dec 5 2012, 08:04 PM Paolo from this post to the mpml asteroids and comets gr... Dec 6 2012, 08:15 AM machi So we can expect images with resolution ~100 m/pix... Dec 6 2012, 10:58 AM Explorer1 So the images will be the equivalent of what Deep ... Dec 6 2012, 11:19 PM machi Deep Space took images of Braille with resolution ... Dec 7 2012, 12:43 PM Paolo anyway, as the camera has two linear CCDs, a forwa... Dec 7 2012, 01:17 PM Phil Stooke Machi, that is Steins, not Braille.
And Paolo - d... Dec 7 2012, 02:11 PM Paolo QUOTE (Phil Stooke @ Dec 7 2012, 03:11 PM... Dec 7 2012, 07:56 PM machi QUOTE (Phil Stooke @ Dec 7 2012, 03:11 PM... Dec 7 2012, 03:11 PM Paolo third radar picture http://echo.jpl.nasa.gov/aster... Dec 8 2012, 08:46 AM machi According to this page, flyby distance will be aro... Dec 9 2012, 10:59 AM tasp I'm not thinking of any other 'rocks' ... Dec 9 2012, 01:21 PM Paolo Itokawa had been imaged by radar before Hayabusa a... Dec 9 2012, 01:23 PM machi QUOTE (tasp @ Dec 9 2012, 02:21 PM) I... Dec 9 2012, 02:34 PM Phil Stooke Comparing the Itokawa radar images and shape model... Dec 9 2012, 02:53 PM JimOberg Technical info is great. Hsieh hsieh.
Big pictur... Dec 9 2012, 05:47 PM Explorer1 The absence of news is business as usual over ther... Dec 9 2012, 08:38 PM JimOberg QUOTE (Explorer1 @ Dec 9 2012, 09:38 PM) ... Dec 10 2012, 06:14 AM Explorer1 Yes, I've read Don Mitchell's page on the ... Dec 10 2012, 06:32 AM Paolo there was a long article on the development of CE-... Dec 10 2012, 08:15 AM JimOberg QUOTE (Paolo @ Dec 10 2012, 09:15 AM) the... Dec 10 2012, 03:13 PM Paolo another long article in Chinese linked today on th... Dec 10 2012, 06:01 PM JimOberg QUOTE (Paolo @ Dec 10 2012, 07:01 PM) ano... Dec 10 2012, 08:01 PM stevesliva ^ Google Translate
... seems to be a blogger askin... Dec 10 2012, 08:13 PM elakdawalla Google translate worked for me. There's no new... Dec 10 2012, 08:13 PM JimOberg QUOTE (elakdawalla @ Dec 10 2012, 09:13 P... Dec 10 2012, 09:17 PM mcaplinger QUOTE (JimOberg @ Dec 10 2012, 02:17 PM) ... Dec 10 2012, 09:51 PM Phil Stooke http://echo.jpl.nasa.gov/asteroids/Toutati...2_pla... Dec 11 2012, 02:59 PM machi Very interesting images. Here is image pair from 9... Dec 11 2012, 05:06 PM Phil Stooke 15 years ago I made a map of Toutatis, using an ex... Dec 11 2012, 06:04 PM Paolo anybody knows whether ESA is providing tracking su... Dec 13 2012, 01:07 PM Greenish The images at http://echo.jpl.nasa.gov/asteroids/T... Dec 13 2012, 03:00 PM Phil Stooke I don't see anything in the online chinese pre... Dec 14 2012, 03:57 PM Paolo I have seen a release (in Chinese) on the site of ... Dec 14 2012, 04:14 PM machi I read on multiple Chinese pages, that they planne... Dec 14 2012, 04:43 PM Paolo be sure to check this!
http://www.youtube.com/... Dec 14 2012, 05:46 PM Phil Stooke The radar video is great - first time I have seen ... Dec 14 2012, 06:51 PM machi The video is great, but Toutatis looks somewhat di... Dec 14 2012, 07:53 PM yaohua2000 Video: http://news.cntv.cn/china/20121215/100850.s... Dec 14 2012, 11:27 PM Cosmic Penguin Just in from the Chinese news TV reports an hour a... Dec 14 2012, 11:30 PM tedstryk Woah! That is better than I was expecting. W... Dec 14 2012, 11:35 PM machi Fantastic and great news!
Now we have another... Dec 14 2012, 11:56 PM Explorer1 Very fast release! I'm glad to have been w... Dec 15 2012, 12:06 AM elakdawalla I wonder, were these images taken with the webcam-... Dec 15 2012, 12:09 AM Paolo QUOTE (elakdawalla @ Dec 15 2012, 01:09 A... Dec 15 2012, 08:32 AM Phil Stooke 3.2 km? Amazing, just amazing. Solar panel monit... Dec 15 2012, 12:18 AM mcaplinger QUOTE (Phil Stooke @ Dec 14 2012, 05:18 P... Dec 15 2012, 12:28 AM JimOberg QUOTE (mcaplinger @ Dec 15 2012, 01:28 AM... Dec 17 2012, 01:57 PM elakdawalla I'm trying to figure out what the scale of the... Dec 15 2012, 12:38 AM machi My measurements are: long axis ~800 pix, short axi... Dec 15 2012, 12:59 AM Phil Stooke I can confirm that this view shows the long dimens... Dec 15 2012, 01:06 AM Phil Stooke Bringing out a bit more detail in the brighter are... Dec 15 2012, 01:26 AM machi Attempted comparison with Goldstone radar imagery. Dec 15 2012, 01:46 AM ElkGroveDan Is there any doubt that we are looking at two dist... Dec 15 2012, 02:37 AM Phil Stooke If this is an approach sequence, there may be a de... Dec 15 2012, 02:47 AM Stefan QUOTE (Phil Stooke @ Dec 15 2012, 03:47 A... Dec 15 2012, 11:58 AM elakdawalla Beginning to look at the image and try some early ... Dec 15 2012, 02:58 AM yaohua2000 More info: 20 Kbps at 7 million km, 90% data has b... Dec 15 2012, 03:01 AM tedstryk Thanks for posting that! I think you mean 5 m... Dec 15 2012, 03:07 AM Phil Stooke Shape model and slope map here:
http://echo.jpl.n... Dec 15 2012, 04:30 AM Paolo wow! China releases the first pics and I happe... Dec 15 2012, 07:37 AM Doc Outstanding Chinese performance. Thanks for postin... Dec 15 2012, 09:08 AM Tayfun Öner Here is a 3D PDF of the shape model. (It is heavil... Dec 15 2012, 09:30 AM machi Here is Chinese TV show dedicated to Toutatis flyb... Dec 15 2012, 11:14 AM Drkskywxlt Congrats to the Chinese! There's some dep... Dec 15 2012, 11:58 AM machi Yes, all images are almost equal (apart from size)... Dec 15 2012, 12:41 PM tolis Amazing stuff!
Apart from the sheer speed of ... Dec 15 2012, 02:07 PM Paolo this is what a Chang'e 2 CMOS webcam looks lik... Dec 15 2012, 02:12 PM Phil Stooke Comparison of the new image with the radar shape f... Dec 15 2012, 02:31 PM Paolo Chinese sources such as this http://www.stdaily.co... Dec 16 2012, 09:53 AM Cosmic Penguin Apparently the main camera was not powered on (nor... Dec 16 2012, 11:30 AM machi I have somewhat different informations about Chang... Dec 16 2012, 10:15 AM Paolo I don't want to belittle the CE-2 achievement,... Dec 16 2012, 12:01 PM mcaplinger QUOTE (Paolo @ Dec 16 2012, 05:01 AM) wha... Dec 16 2012, 04:29 PM dilo I tried to make a stereogram using the fourth and ... Dec 16 2012, 10:15 PM JimOberg QUOTE (Paolo @ Dec 16 2012, 01:01 PM) as ... Dec 17 2012, 02:05 PM machi We can look to the past. CE-2 flyby was in many wa... Dec 16 2012, 12:36 PM tedstryk It may also provide a bridge between what we are s... Dec 16 2012, 01:22 PM Phil Stooke "beside basic shape and topography, what can ... Dec 16 2012, 03:24 PM Paolo QUOTE (Phil Stooke @ Dec 16 2012, 04:24 P... Dec 17 2012, 09:39 AM tasp Appreciate the stereogram effort very much. I thi... Dec 17 2012, 04:40 AM JimOberg On a policy issue note, we must realize that China... Dec 17 2012, 02:09 PM |
|
Lo-Fi Version | Time is now: 10th November 2024 - 05:58 PM |
|
RULES AND GUIDELINES Please read the Forum Rules and Guidelines before posting. IMAGE COPYRIGHT |
OPINIONS AND MODERATION Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators. |
SUPPORT THE FORUM Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member. |
|
