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Faint Ring Thread, Saturn's D, E and G rings
ugordan
post Feb 2 2009, 02:28 PM
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Again, a shot of the clump/moonlet in the G ring, slightly motion-smeared: http://saturn.jpl.nasa.gov/multimedia/imag...7/N00128611.jpg
Not as obvious as some other shots, but it's still there and, apparently, persistent.

No official word on this yet?


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volcanopele
post Mar 3 2009, 08:55 PM
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Tiny Moonlet Within G Ring Arc
http://ciclops.org/view/5493/Tiny_Moonlet_Within_G_Ring_Arc

The discovery of the G ring arc moonlet has been officially announced via a press release and an IAU Circular.


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stevesliva
post Mar 3 2009, 10:53 PM
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...and I just read about it on Emily's blog.

How close are the G-arc flybys mentioned just recently here?
http://planetary.org/blog/article/00001857/

Has the first already happened? Doesn't sound like it will look like much even relatively close.
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volcanopele
post Mar 3 2009, 11:52 PM
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The one in January 2010 is in the 10000-20000 km range (Celestia gives me ~14000 km). At that distance, S/ 2008 S 1 should be about 6 pixels across. The other would be in February 2017 at 20000-30000 km.


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elakdawalla
post Mar 3 2009, 11:57 PM
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Huh, I didn't realize you could get that close to the G ring. Are there plans actually to attempt to image S/2008 S1?


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volcanopele
post Mar 4 2009, 12:05 AM
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We are nicely out of the ring plane at the time, so it should be fine.


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nprev
post Mar 4 2009, 12:14 AM
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Just restating congrats to Gordan for spotting this moonlet in what are probably the discovery images...what an eye!!! smile.gif


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ustrax
post Mar 4 2009, 11:55 AM
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QUOTE (nprev @ Mar 4 2009, 12:14 AM) *
Just restating congrats to Gordan for spotting this moonlet in what are probably the discovery images...what an eye!!! smile.gif


Maybe I've missed something but are you saying that it was Gordan who spotted it first?... smile.gif

made a gif out of the announcement images:
http://www.gifninja.com/Workspace/e6c3d462...3422/output.gif


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ugordan
post Mar 4 2009, 12:01 PM
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QUOTE (ustrax @ Mar 4 2009, 12:55 PM) *
Maybe I've missed something but are you saying that it was Gordan who spotted it first?... smile.gif

I think Nick is referring to this post. The raw image links apparently don't work anymore since the page redesign, but it's the same images as in the release.


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canis_minor
post Jan 23 2010, 05:59 AM
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FYI next Wednesday is a close encounter to Aegaeon (closest until 2015), the parent body within the G ring. Close approach should be about 13,000 or so km and images will be taken near ~ 90 deg phase. I'm divided between thinking that these images will be vanilla, noisy images like many Cassini has taken before, or potentially spectacular. Should be worth a look though. Tracking pass begins 11:30PM UK time, 3:30PM Pacific. - Cheers.
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dilo
post Apr 27 2010, 10:42 AM
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On April 18 Cassini made an interesting sequence of images of E-ring and main ring halo (see http://saturn.jpl.nasa.gov/photos/raw/?sta...toredQ=2225395).
Using 3 consecutive clean-filter images with different exposures (W00063561/2/3), I made this false color "HDR" composition (red=darkest, blue=bright - solarization used too):


Attached thumbnail(s)
Attached Image
 


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stevesliva
post Aug 5 2010, 10:04 PM
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Oddly, I think, the Cassini status noted this:

QUOTE
Friday, July 30 (DOY 211)

The S61 sequence concluded and S62 began execution today at 2010-211T18:51:00. The sequence will run for 37 days and conclude on Sept. 6. During that time there will be one targeted encounter of Enceladus and eighteen non-targeted flybys ­ two each of Titan, Dione, and Epimetheus, and one each of Calypso, Atlas, Pandora, Daphnis, Janus, Pan, Tethys, Polydeuces, Telesto, Prometheus, G_ARC, and Aegaeon. Three OTMs are scheduled, numbered 259 through 261.


I thought 'G arc' and 'Aegaeon' would be the same thing??
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Hungry4info
post Aug 5 2010, 10:09 PM
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Agaeon is a satellite, the G-arc is a ringlet.


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