My Assistant
A ring for Rhea? |
Mar 6 2008, 07:24 PM
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#1
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![]() Junior Member ![]() ![]() Group: Members Posts: 43 Joined: 31-May 05 From: Bloomington, Minnesota Member No.: 397 |
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Mar 7 2009, 03:52 AM
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#2
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Member ![]() ![]() ![]() Group: Members Posts: 903 Joined: 30-January 05 Member No.: 162 |
Yeah, finding accurate numbers, and then being able to crunch them precisely is the trick. (I make no claims to accuracy, my 'good' calculator is on the disabled list) If the commensurability with Rhea's orbital period doesn't work out, do your periods still exhibit the ratios between themselves? {6/8, 7/8, 6/7} I am still marveling we get stuff organized outside the Roche limit, and inside the Hill sphere, at this apparent very low particle density. Crikey, how does the stuff interact upon itself to stay collimated ? And the 'residue' along the equator is teeny, there never was much stuff in the equatorial plane. Or, the stuff preferentially escapes off the high end (if there ever was much 'stuff') and is lost to the Rhean realm. But then where does it go? Do we have oblateness data on Rhea yet ? |
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Patteroast A ring for Rhea? Mar 6 2008, 07:24 PM
ugordan QUOTE Scientists detected hints of the rings when ... Mar 6 2008, 07:42 PM
Juramike If indeed there was a ring system around Rhea, wou... Mar 6 2008, 07:52 PM
Superstring The article below goes into more detail:
http://ww... Mar 6 2008, 07:52 PM
Juramike Now also on the NASA Cassini-Huygens website:
htt... Mar 6 2008, 07:56 PM
elakdawalla I'll have an article later but have to board a... Mar 6 2008, 08:03 PM
ugordan N1516373983_1.IMG appears to be by far the longest... Mar 6 2008, 08:20 PM
jasedm A couple of years is a long time to check and re-c... Mar 6 2008, 08:52 PM
djellison I'm reminded of : http://www.the-reel-mccoy.co... Mar 6 2008, 10:50 PM
elakdawalla Well, thanks to absolutely awful weather in Texas ... Mar 7 2008, 12:41 AM
nprev Great article, Emily!
Sounds pretty strong ... Mar 7 2008, 01:36 AM
elakdawalla No, Dallas/Fort Worth. March is actually usually ... Mar 7 2008, 05:10 AM
tasp When the word 'ring' is used in regards to... Mar 7 2008, 05:28 AM
edstrick At an arm-waving speculative level....
As previou... Mar 7 2008, 08:09 AM
AndyG QUOTE (edstrick @ Mar 7 2008, 08:09 AM) A... Mar 7 2008, 10:35 AM
ngunn QUOTE (AndyG @ Mar 7 2008, 10:35 AM) Comm... Mar 7 2008, 01:21 PM
ugordan QUOTE (ngunn @ Mar 7 2008, 02:21 PM) How ... Mar 7 2008, 01:35 PM
Patteroast QUOTE (ugordan @ Mar 7 2008, 07:35 AM) ..... Mar 7 2008, 01:54 PM
Juramike QUOTE (Patteroast @ Mar 7 2008, 08:54 AM)... Mar 7 2008, 02:00 PM
nprev ...Gordan, you're killin' me!
Almo... Mar 7 2008, 02:06 PM
ngunn QUOTE (nprev @ Mar 7 2008, 02:06 PM) How ... Mar 7 2008, 02:43 PM
ugordan Are there any ideas on the total mass in the putat... Mar 7 2008, 03:04 PM
IM4 QUOTE (ugordan @ Mar 7 2008, 03:04 PM) Ar... Mar 7 2008, 05:13 PM
ugordan I can't access that link, unfortunately. 1 par... Mar 7 2008, 05:24 PM
Juramike QUOTE (IM4 @ Mar 7 2008, 12:13 PM) ISS no... Mar 7 2008, 06:30 PM
charborob QUOTE (Juramike @ Mar 7 2008, 01:30 PM) S... Mar 7 2008, 07:06 PM
Gsnorgathon QUOTE (Juramike @ Mar 7 2008, 06:30 PM) T... Mar 7 2008, 08:07 PM
JRehling This is counterintuitive to me...
If a noticeable... Mar 7 2008, 08:47 PM
djellison Where would metaphorical Lagrangian points be for ... Mar 7 2008, 03:02 PM
Greg Hullender For Rhea, L1, I get 5,810 km from the center of Rh... Mar 7 2008, 04:33 PM
MarcF Sorry, this might be stupid, but if the ring indee... Mar 7 2008, 07:47 PM
ugordan QUOTE (MarcF @ Mar 7 2008, 08:47 PM) A ch... Mar 7 2008, 07:49 PM
elakdawalla Hi all....way too tired after the trip cum toddler... Mar 8 2008, 05:31 AM
rlorenz QUOTE (elakdawalla @ Mar 8 2008, 12:31 AM... Mar 8 2008, 03:45 PM
zvezdan I have no problems with seeing with electrons. Bu... Mar 10 2008, 01:23 AM
tasp Thanks for posting the graph. Clearly something i... Mar 8 2008, 02:13 PM
elakdawalla QUOTE (tasp @ Mar 8 2008, 06:13 AM) Thank... Mar 8 2008, 08:09 PM
nprev Ah. So, it doesn't take very much material at ... Mar 8 2008, 04:05 PM
tasp Do we have any magnetospheric images of the Rhean... Mar 8 2008, 07:37 PM
tasp Yes,
I covet having another instrument detect thi... Mar 9 2008, 01:21 AM
IM4 By the way, central ring period exactly equals the... Mar 9 2008, 10:16 AM
Elias Hi everyone,
Just to make some more issues on the... Mar 9 2008, 03:49 PM
Greg Hullender Wow! Thanks a lot!
So, to eliminate dou... Mar 9 2008, 04:54 PM
elakdawalla Cool, it didn't occur to me to check the PDS f... Mar 10 2008, 04:49 AM
Elias QUOTE (elakdawalla @ Mar 10 2008, 05:49 A... Mar 10 2008, 01:00 PM
ynyralmaen QUOTE (Elias @ Mar 10 2008, 01:00 PM) Not... Mar 10 2008, 02:03 PM
ilbasso Elias, looking at your description of fields aroun... Mar 10 2008, 02:12 PM
Rob Pinnegar QUOTE (ilbasso @ Mar 10 2008, 07:12 AM) I... Mar 12 2008, 02:03 AM
Elias Accurate definitions are always hard to achieve. I... Mar 10 2008, 03:39 PM
ynyralmaen If I may stick my oar in... I think at a minimum, ... Mar 10 2008, 03:49 PM
zvezdan Thanks Emily for the dates. There are indeed very ... Mar 11 2008, 12:49 AM
ynyralmaen QUOTE (zvezdan @ Mar 11 2008, 12:49 AM) T... Mar 11 2008, 09:07 AM
zvezdan QUOTE (ynyralmaen @ Mar 11 2008, 03:07 AM... Mar 11 2008, 06:44 PM
ynyralmaen Good point... yep, looks like it was just outside ... Mar 11 2008, 07:07 PM
zvezdan Tethys flyby geometry (Hill sphere radius is only ... Mar 11 2008, 12:59 AM
zvezdan And Dione flyby:
Cassini went directly over the s... Mar 11 2008, 01:19 AM
tasp (My apologies if I didn't get the calculations... Mar 6 2009, 02:56 PM
ngunn QUOTE (tasp @ Mar 6 2009, 02:56 PM) Divyi... Mar 6 2009, 03:13 PM
jasedm QUOTE (tasp @ Mar 6 2009, 02:56 PM) Looks... Mar 6 2009, 08:34 PM
Rob Pinnegar QUOTE (tasp @ Mar 6 2009, 07:56 AM) Looks... Mar 7 2009, 01:07 AM
ngunn No. What started us up again was this nice CHARM p... Mar 6 2009, 08:53 PM
Rob Pinnegar QUOTE (tasp @ Mar 6 2009, 08:52 PM) If th... Mar 8 2009, 12:25 AM
ngunn Audio and transcript of the CHARM have now been po... Mar 9 2009, 01:19 PM
ugordan QUOTE (ngunn @ Mar 9 2009, 02:19 PM) Audi... Mar 9 2009, 01:38 PM
Floyd Ugordan--Way to spot something out of the ordinary... Mar 9 2009, 03:14 PM
jasedm I second Floyd's comment Gordan - very credita... Mar 9 2009, 04:21 PM
ugordan Floyd: wow, my first virtual Mars bar!
jased... Mar 9 2009, 05:01 PM
remcook Rhea stellar occultation to look for the ring? (pl... Apr 28 2009, 02:30 PM
ugordan If it were a stellar occultation, they'd want ... Apr 28 2009, 02:37 PM
jasedm QUOTE (ugordan @ Apr 28 2009, 03:37 PM) S... Jul 11 2009, 05:00 PM
ugordan Unfortunately, if the rings are comprised of bould... Jul 11 2009, 05:19 PM
Rob Pinnegar QUOTE (ugordan @ Jul 11 2009, 11:19 AM) I... Jul 12 2009, 06:02 PM
ugordan Coincidentally, Anne Verbiscer wrote about the ecl... Jul 12 2009, 06:10 PM
remcook good point. But who knows, that star might turn ou... Apr 28 2009, 02:40 PM
tasp IIRC, as an object darkens in visible light, it br... Jul 11 2009, 11:45 PM
jasedm Thanks for the responses - it does appear that rem... Jul 13 2009, 08:44 AM
Drkskywxlt http://news.sciencemag.org/sciencenow/2010...never... Jul 1 2010, 07:18 PM
Hungry4info I know it sounds silly, but could a Rhean magnetic... Jul 7 2010, 03:15 AM
nprev Doubt it. My bet is that there's a low-yield g... Jul 7 2010, 03:44 AM
Hungry4info Would that explain the observed symmetrical struct... Jul 7 2010, 03:48 AM
nprev Hmm. I don't know. Why would a magnetic field ... Jul 7 2010, 04:09 AM
tedstryk QUOTE (nprev @ Jul 7 2010, 05:09 AM) but ... Jul 12 2010, 11:24 PM
Hungry4info I don't really think a magnetic field sufficie... Jul 7 2010, 04:19 AM
nprev Me neither!
Looking forward to what the p... Jul 7 2010, 05:10 AM
tasp {not claiming to be a pro, just a coincidence this... Jul 7 2010, 06:22 AM
Antdoghalo young fracture on Rhea
There's no visible crat... Jul 12 2010, 04:14 PM
nprev Ah- didn't know that. Thanks, Ted! It was ... Jul 12 2010, 11:50 PM![]() ![]() |
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