EPOXI Mission News |
EPOXI Mission News |
Jan 4 2011, 08:39 PM
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#286
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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 was reading an article about H2 in an Italian popular astronomy magazine. it mentions as a possible origin for the nucleus' smooth surface tidal interactions with Jupiter during the April 1971 flyby at 0.09 AU.
Anyone heard of a similar theory? My impression is that the distance is too large for it to tear apart and re-aggregate even a loosely-bound "rubble pile", but maybe I am wrong. |
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Jan 5 2011, 09:13 AM
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#287
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Member Group: Members Posts: 259 Joined: 23-January 05 From: Seattle, WA Member No.: 156 |
.09 AU would put it ~7 times farther out than Callisto. I dunno nuthin' 'bout no gravity, but that seems awfully far to do any sort of resurfacing.
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Jan 5 2011, 02:02 PM
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#288
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Solar System Cartographer Group: Members Posts: 10151 Joined: 5-April 05 From: Canada Member No.: 227 |
Agreed. The idea isn't bad but I might be looking for an earlier and much closer encounter if orbit data are good enough - might be too chaotic, though.
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 PD: 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) |
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Feb 18 2011, 06:00 AM
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#289
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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 |
there is a new article on EPOXI's "Earth as an alien planet" observations on arXiv today
Colors of a Second Earth II: Effects of Clouds on Photometric Characterization of Earth-like Exoplane |
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Feb 18 2011, 02:46 PM
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#290
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Very cool. Thanks for that link!
-------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Mar 11 2011, 07:59 PM
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#291
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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 noticed this paper on Astronomy & Astrophysics Earth-based detection of the millimetric thermal emission from the nucleus of comet 8P/Tuttle (in free access at this moment)
It seems comet Tuttle has yet another dumbbell-shaped nucleus: QUOTE Harmon et al. (2008, 2010) interpreted their Arecibo radar observations of the nucleus of comet 8P/Tuttle as implying a contact binary and proposed a shape model composed of two spheroids in contact. Lamy et al. (in prep.) found that the light curve of the nucleus derived from their Hubble Space Telescope observations was indeed most accurately explained by a binary configuration and derived a model composed of two spheres in contact. |
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Jun 16 2011, 06:30 PM
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#292
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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 was expecting tomorrow's "Science" to include articles on early MESSENGER science and instead: EPOXI at Comet Hartley 2
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Jun 17 2011, 04:37 PM
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#293
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Solar System Cartographer Group: Members Posts: 10151 Joined: 5-April 05 From: Canada Member No.: 227 |
A nice summary, but don't panic, folks, there's no new map of the nucleus yet! Interesting description of the rotation state though - a long axis mode like those of Halley, Toutatis and maybe Hyperion.
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 PD: 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) |
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Jul 4 2011, 06:14 PM
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#294
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Looks like the Rosetta Steins data wasn't the only one to hit the Small Bodies node recently. Here's Hartley 2 in natural color, OGB filters overlaid over a slightly better quality (closer and less smeared) clear frame. A bit of gapfill was used from that low res OGB data at the right limb where deconvolution ringing was caused by proximity to the image edge. Magnified 1.5x from the original pixel scale.
There's this and the outbound color shot, but it's badly smeared. The rest of the HRI frames appear to be clear frames only... -------------------- |
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Jul 4 2011, 06:55 PM
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#295
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Solar System Cartographer Group: Members Posts: 10151 Joined: 5-April 05 From: Canada Member No.: 227 |
Very nice! Thanks.
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 PD: 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) |
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Jul 5 2011, 12:47 AM
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#296
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Senior Member Group: Members Posts: 1276 Joined: 25-November 04 Member No.: 114 |
ugordan - Amazing work!
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Jul 14 2011, 06:22 PM
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#297
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Comet Hartley 2 from High Resolution Imager. Color data are similar to the Ugordan's image of Hartley. Only difference is, that I used red filter and not orange one.
I was focusing more on nucleus, so I used higher resolution underlaying image and jets are somewhat suppressed (and processed with different type of deconvolution). Image has original size with resolution 4.5 m/pix (original resolution of color images is around 15 m/pix). -------------------- |
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Jul 14 2011, 06:50 PM
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#298
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Nice! I used "orange" because being centered at 650 nm it is in actuality red, whilst the "red" filter is centered around 750 nm so is in fact near-infrared.
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Jul 14 2011, 07:01 PM
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#299
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Thanks!
So this is result, when one looks more on filter names and not on nanometers. -------------------- |
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Jul 14 2011, 07:14 PM
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#300
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Even though that name is a bit clumsy, I actually quite like the way they chose HRI imager filters, a simple and straightforward approach. Pretty much each filter has a bandpass of 100 nm, sharp cutoff and neighbors nicely with the next filter and the wavelengths are easy to remember. If it wasn't for the defocus problem, it would have been one sweet instrument.
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