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Pluto System Small Moons: NH Post-Encounter Phase, 1 Aug 2015- TBD
alan
post Oct 22 2015, 06:09 PM
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Kerberos
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Gladstoner
post Oct 22 2015, 06:18 PM
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Nix:

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https://www.nasa.gov/feature/last-of-pluto-...by-new-horizons
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stevesliva
post Oct 23 2015, 04:57 PM
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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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stfletch
post Oct 23 2015, 07:47 PM
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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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ngunn
post Oct 23 2015, 09:51 PM
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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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alex_k
post Oct 24 2015, 12:01 PM
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My processing of Kerberos, 4 images stacked, x16:
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nprev
post Oct 24 2015, 08:21 PM
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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.


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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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fred_76
post Oct 24 2015, 09:28 PM
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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.

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Fred


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Astronopithecus normandimensis nephophobis
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Bill Harris
post Oct 24 2015, 11:11 PM
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QUOTE
apparent 'dumb-bell' shape of Kerberos it's tempting to speculate...

Don't 'spose it's a contact binary?


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nprev
post Oct 24 2015, 11:16 PM
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<shrug> Could well be. Doubt we can tell from NH data.


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Bill Harris
post Oct 25 2015, 07:18 AM
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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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Phil Stooke
post Nov 6 2015, 03:44 PM
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New images of Hydra today. This is a composite of the two images, enlarged 4x.

Phil

Attached Image


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... because the Solar System ain't gonna map itself.
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alex_k
post Nov 9 2015, 04:53 AM
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My processing of Hydra 07/13 23:16 series, 3 images used, enlarged 6x.
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[upd]
...and the series 07/13 04:13, 2 images, 8x.
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alex_k
post Nov 10 2015, 08:23 AM
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A very hypothetic attempt to find match between Hydra series.
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From left to right:
07/13 04:13
07/13 23:16
07/14 07:40
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Bill Harris
post Nov 10 2015, 10:54 AM
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QUOTE (Bill Harris @ Oct 25 2015, 02:18 AM) *
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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