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Rosetta flyby of Asteroid Steins, 5th September 2008
mchan
post Aug 14 2008, 01:44 AM
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Thanks for posting this description.

QUOTE (cndwrld @ Aug 13 2008, 01:57 AM) *
On Saturday, 06 Sept from 12:00 - 13:00 CET, the results of the flyby will be presented at ESOC and placed on the web pages.

Hope to see lots of images then. smile.gif
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cndwrld
post Aug 14 2008, 07:22 AM
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QUOTE
Hope to see lots of images then.


Ahhh, don't we all...... But as in the past, I expect we'll see a handful of press conference pictures. Still, they should be very cool pictures.


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cndwrld
post Aug 18 2008, 07:49 AM
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nth Asteroid Flyby

I was wondering about this question, and searches didn't give me an answer. As Rosetta gears up for the flyby of Steins, how often has an asteroid flyby been done before? Is this the second time, or the fifth? It would be great if one of you space historians could put this into focus.


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djellison
post Aug 18 2008, 09:17 AM
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Ones I can think of

Galileo did Gaspera, then Ida & Dactly (that's only one flyby though - Dactyl was just gravy )

NEAR did Maltide then EROS, then orbited Eros

Stardust did Annefrank

DS1 did Braille ( although that didn't go well )

6 proper planned ones then I think.

Technically, NH did 132524_APL, and Cassini did Masursky - but they're more of a distant encounter rather than flybys.
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Guest_PhilCo126_*
post Aug 18 2008, 11:19 AM
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Don't forget Hayabusa... and the cometary fly-bys smile.gif
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djellison
post Aug 18 2008, 11:58 AM
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Hayabusa was a rendezvous and orbit, and well, a comet flyby doesn't count as an asteroid flyby, does it smile.gif
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cotopaxi
post Aug 18 2008, 04:41 PM
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Some information and images from the navigation campaign:
http://www.esa.int/esaCP/SEMC9R6UWJF_index_0.html
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tasp
post Aug 18 2008, 11:42 PM
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I recall Carl Sagan finding difficulty in scheduling observing time from Mariner 9 (IIRC) of Phobos and Deimos since they were not mentioned in the 'official' mission plans.

He advanced the idea that studying Phobos and Deimos at Mars was the equivalent of a free mission to the asteroid belt, and this point seemed to do the trick.

Happily, all these years later, can we really categorize all these wee rocky beasties accurately ??

So many weird and wonderful objects to study, and they all are unique in their own ways.


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tallbear
post Aug 19 2008, 07:41 AM
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QUOTE (tasp @ Aug 18 2008, 03:42 PM) *
I recall Carl Sagan finding difficulty in scheduling observing time from Mariner 9 (IIRC) of Phobos and Deimos since they were not mentioned in the 'official' mission plans.

He advanced the idea that studying Phobos and Deimos at Mars was the equivalent of a free mission to the asteroid belt, and this point seemed to do the trick.

Happily, all these years later, can we really categorize all these wee rocky beasties accurately ??

So many weird and wonderful objects to study, and they all are unique in their own ways.



and Cassini is doing plenty of asteroid flybys as it gets closer looks at Saturn's fine collection of asteroids
.... T
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ugordan
post Aug 19 2008, 08:20 AM
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Well, "closer looks" is a bit misleading, don't you think? I'd declare something a flyby if the s/c actually resolved the object. Photometry and light curves are stretching it a bit, IMHO.


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jasedm
post Aug 19 2008, 08:24 AM
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This is a great way of characterising the small moon flybys in Cassini's schedule. I think Tallbear is referring to everything inside of Phoebe's orbit rather than the 30 or so rocks in eccentric/inclined orbits further out
Whilst the small inner moons may or may not be captured asteroids, the 24-for-one Cassini mission (Saturn plus 23 moons at reasonable ranges) is fantastically good value.
Cassini conducts a 'flyby' today of Pallene at 61,000km - a moon completely unknown before 2004. Were this a Rosetta flyby (or New Horizons) of an asteroid at that sort of range, the media and other interest would be much higher than it is.
Perhaps we've come to take Cassini's results for granted a little smile.gif
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Guest_PhilCo126_*
post Aug 19 2008, 05:46 PM
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Stardust is still on route for another flyby with Tempel-1 ( a comet - I know ), which was impacted by Deep Impact in July 2005.
The latter spacecraft couldn't observe the impact crater due to the dust & debris flying away from the comet, so Stardust will take a look in the year 2011...
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JRehling
post Aug 19 2008, 06:34 PM
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FWIW, of all of the small inner satellites of Saturn inside Phoebe's orbit, the farthest out is only at 2.9% of Phoebe's semimajor axis. "Inside Phoebe's orbit" is quite an overstatement. I doubt if anything that deep in Saturn's satellite system can be presumed to have retained the characteristics of an asteroid from outside the system, but small bodies do tend to be similarly nonspherical.
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elakdawalla
post Aug 25 2008, 03:47 AM
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QUOTE (djellison @ Aug 18 2008, 01:17 AM) *
Ones I can think of...


This is a bit late of a reply because of my vacation, but I'll point out my post here, which shows the 7 asteroid systems (8 bodies total) and 4 comets that have been imaged to date. And don't forget Vega 1 and Giotto also imaged Halley. So depending on how you add things up you can come up with anywhere from 11 to 14 "encounters."

A number of people have requested a single-image version of my scale montage -- I have that together and will post it this week as soon as I round up the image credits.

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stevesliva
post Aug 25 2008, 04:07 AM
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QUOTE (elakdawalla @ Aug 24 2008, 11:47 PM) *
A number of people have requested a single-image version of my scale montage -- I have that together and will post it this week as soon as I round up the image credits


I thought it was awesome, too. I had no idea that Mathilde was the biggest of the bunch, the quality of the Galileo images is particularly deceiving... would have bet they were bigger. One with Phobos and Deimos would also be interesting. I just looked at the stats and was surprised to see the Phobos is also smaller than Mathilde. And I knew Itokawa was small, but indeed I had a poor conception of scale there versus Eros.
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