Pluto System Small Moons: NH Post-Encounter Phase, 1 Aug 2015- TBD |
Pluto System Small Moons: NH Post-Encounter Phase, 1 Aug 2015- TBD |
Oct 22 2015, 06:09 PM
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#16
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Senior Member Group: Members Posts: 1887 Joined: 20-November 04 From: Iowa Member No.: 110 |
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Oct 22 2015, 06:18 PM
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#17
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Member Group: Members Posts: 714 Joined: 3-January 08 Member No.: 3995 |
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Oct 23 2015, 04:57 PM
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#18
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Senior Member Group: Members Posts: 1582 Joined: 14-October 05 From: Vermont Member No.: 530 |
I missed the PR text accompanying the Kerberos image until today... It's interesting that they now believe it's less massive than expected, while predictions for the rest were relatively spot-on.
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Oct 23 2015, 07:47 PM
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#19
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Newbie Group: Members Posts: 9 Joined: 25-September 15 Member No.: 7790 |
Yup. I guess its possible that the interpretation of the gravitational "weighing" could still be correct if Kerberos is a lot denser than the other small moons, though that would be pretty unexpected and hard to explain in itself.
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Oct 23 2015, 09:51 PM
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#20
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
It's re-enacting the story of Pluto. Pluto was discovered as a result of a targeted search for a presumed massive body perturbing the outer planets. It was found in the right place but turned out not to have the mass required. In the new as in the old case I imagine the calculations will be rerun to make presumed greater mass of Kerberos unnecessary, poor little thing.
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Guest_alex_k_* |
Oct 24 2015, 12:01 PM
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#21
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Oct 24 2015, 08:21 PM
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#22
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Merciless Robot Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Looking at the apparent 'dumb-bell' shape of Kerberos it's tempting to speculate that this property combined with varied phase angles between observations may account for the size estimate & albedo errors in some way. Most such estimates assume a more or less spherical body for simplicity's sake.
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Oct 24 2015, 09:28 PM
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#23
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Junior Member Group: Members Posts: 47 Joined: 21-June 15 Member No.: 7518 |
This is an attempt to colorize Nix using the previous color picture and the last high resolution posted today.
Not that easy because the angles of view are different. I distorded the color picture so that the main structures are surimposed between the images. Fred -------------------- Astronopithecus normandimensis nephophobis
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Oct 24 2015, 11:11 PM
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#24
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Senior Member Group: Members Posts: 2998 Joined: 30-October 04 Member No.: 105 |
QUOTE apparent 'dumb-bell' shape of Kerberos it's tempting to speculate... Don't 'spose it's a contact binary? -------------------- |
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Oct 24 2015, 11:16 PM
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#25
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Merciless Robot Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
<shrug> Could well be. Doubt we can tell from NH data.
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Oct 25 2015, 07:18 AM
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#26
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Senior Member Group: Members Posts: 2998 Joined: 30-October 04 Member No.: 105 |
Given that many small bodies have been observed to be bi-lobed or dumbell-shaped and the several that have been visited and seen to be contact binaries it's not to much a stretch to assume that Kerberos may be.
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Nov 6 2015, 03:44 PM
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#27
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Solar System Cartographer Group: Members Posts: 10160 Joined: 5-April 05 From: Canada Member No.: 227 |
New images of Hydra today. This is a composite of the two images, enlarged 4x.
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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Guest_alex_k_* |
Nov 9 2015, 04:53 AM
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#28
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Guest_alex_k_* |
Nov 10 2015, 08:23 AM
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#29
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Nov 10 2015, 10:54 AM
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#30
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Senior Member Group: Members Posts: 2998 Joined: 30-October 04 Member No.: 105 |
Given that many small bodies have been observed to be bi-lobed or dumbell-shaped and the several that have been visited and seen to be contact binaries it's not to much a stretch to assume that Kerberos may be. Looks like the NH data suggests that they are contact binaries, or, on another scale, accretionary bodies: New Horizons data indicates that at least two (and possibly all four) of Pluto's small moons may be the result of mergers between still smaller moons. http://pluto.jhuapl.edu/Multimedia/Science...mp;image_id=377 http://pluto.jhuapl.edu/Multimedia/Science...ergedBodies.jpg --Bill -------------------- |
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