Pluto System Small Moons: NH Post-Encounter Phase, 1 Aug 2015- TBD |
Pluto System Small Moons: NH Post-Encounter Phase, 1 Aug 2015- TBD |
Aug 1 2015, 06:07 PM
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#1
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Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
This topic is for discussion of data on Nix, Hydra, Styx, and Kerberos (as well as any other small bodies that may be discovered) received after 1 Aug 2015.
-------------------- 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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Sep 11 2015, 05:45 PM
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#2
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Junior Member Group: Members Posts: 75 Joined: 8-July 15 Member No.: 7566 |
First proper image of Nix! It's quite bright.
ADMIN EDIT: Image resized. Please refer to Forum Rules: 3.2 and 3.2. Full image here. |
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Sep 11 2015, 05:59 PM
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#3
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Solar System Cartographer Group: Members Posts: 10166 Joined: 5-April 05 From: Canada Member No.: 227 |
Yes - new pix of Nix!
This is a composite of the four frames with a big contrast stretch. 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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Sep 11 2015, 06:12 PM
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#4
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
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Sep 11 2015, 06:51 PM
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#5
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Senior Member Group: Members Posts: 1583 Joined: 14-October 05 From: Vermont Member No.: 530 |
So, the NH follow-on target, 2014 MU69, is likely no larger than this? But the range here is 200,000km and may be as low as 12,500km there...
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Sep 11 2015, 06:58 PM
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#6
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Junior Member Group: Members Posts: 48 Joined: 10-September 06 Member No.: 1129 |
Reminds me of Prometheus.
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Sep 11 2015, 09:23 PM
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#7
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
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Sep 11 2015, 10:31 PM
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#8
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Junior Member Group: Members Posts: 75 Joined: 8-July 15 Member No.: 7566 |
Is this the best image we will get of Nix? The Wikipedia page for Nix says the best image will show features down to 330 m/pixel, is this that image?
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Sep 12 2015, 01:39 AM
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#9
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
No it isn't.
There will be better images from the observation "N LEISA LORRI BEST" at resolution ~330 m/pix. -------------------- |
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Sep 18 2015, 09:54 PM
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#10
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Member Group: Members Posts: 540 Joined: 17-November 05 From: Oklahoma Member No.: 557 |
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Oct 5 2015, 11:32 PM
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#11
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Junior Member Group: Members Posts: 27 Joined: 2-December 14 Member No.: 7359 |
About Nix and Hydra :
https://blogs.nasa.gov/pluto/2015/10/05/plu...-nix-and-hydra/ |
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Oct 9 2015, 09:03 PM
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#12
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Junior Member Group: Members Posts: 43 Joined: 31-May 05 From: Bloomington, Minnesota Member No.: 397 |
Styx images have come down today!
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Oct 9 2015, 09:04 PM
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#13
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Best image of Styx (probably).
I'm not entirely sure if it's really Styx, but manually and even automatically it was identified positively in the 5 of 6 raw jpeg images of Styx. So this is result of 5 stacked images. Resolution was 3.14 km/pix (before enlarging) and visible disc has dimensions ~20×13 km. It's enlarged 10×. -------------------- |
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Oct 10 2015, 09:22 AM
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#14
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Now I know it's really Styx but stacking leads to somewhat bigger size than it's actual size.
My new measurements are (14×8)+/-2 km. This is still 2× more than is value on the NASA's page. I'm not sure where this discrepancy originated. -------------------- |
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Oct 19 2015, 01:52 PM
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#15
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Newbie Group: Members Posts: 9 Joined: 25-September 15 Member No.: 7790 |
The first images of Kerberos are coming down this week according to @NewHorizons2015! I'm intrigued as to why this moon appears to be so much darker than the rest of the Pluto system bodies.
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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: 1583 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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Guests |
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Oct 24 2015, 08:21 PM
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#22
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Merciless Robot Group: Admin Posts: 8784 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: 8784 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: 10166 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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Guests |
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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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Dec 17 2015, 07:04 PM
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#31
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Senior Member Group: Members Posts: 1887 Joined: 20-November 04 From: Iowa Member No.: 110 |
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Dec 19 2015, 09:24 PM
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#32
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Member Group: Members Posts: 121 Joined: 26-June 04 From: Austria Member No.: 89 |
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Dec 20 2015, 05:54 AM
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#33
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Senior Member Group: Members Posts: 2530 Joined: 20-April 05 Member No.: 321 |
This might make Nix the most densely cratered terrain that we've seen on any world farther out than Saturn? Potentially interesting for establishing cratering rates.
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Dec 20 2015, 09:18 AM
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#34
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Member Group: Members Posts: 495 Joined: 12-February 12 Member No.: 6336 |
Since more than one satellite of Pluto is thought to be a merger of two bodies, or possibly more. So at some point there might also have been a lot of smaller pieces flying around, in view of that I find the cratering of Nix to be more or less what to expect.
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Dec 29 2015, 09:40 AM
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#35
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Senior Member Group: Members Posts: 1088 Joined: 19-February 05 From: Close to Meudon Observatory in France Member No.: 172 |
On several of the latest images quoted "Kerberos" there is another body seen below it :
http://pluto.jhuapl.edu/soc/Pluto-Encounte...0x636_sci_1.jpg (bottom of picture) http://pluto.jhuapl.edu/soc/Pluto-Encounte...0x636_sci_1.jpg (middle right) Another Pluto satellite ? Just a bright star ? |
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Feb 3 2016, 04:26 AM
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#36
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Newbie Group: Members Posts: 2 Joined: 30-November 15 Member No.: 7849 |
On several of the latest images quoted "Kerberos" there is another body seen below it : http://pluto.jhuapl.edu/soc/Pluto-Encounte...0x636_sci_1.jpg (bottom of picture) http://pluto.jhuapl.edu/soc/Pluto-Encounte...0x636_sci_1.jpg (middle right) Another Pluto satellite ? Just a bright star ? I blew up the other body in the two images you mentioned and these are what came up. |
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May 13 2016, 06:45 PM
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#37
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Senior Member Group: Members Posts: 1887 Joined: 20-November 04 From: Iowa Member No.: 110 |
Hydra's icy surface
QUOTE The new data – known as infrared spectra – show the unmistakable signature of crystalline water ice: a broad absorption from 1.50 to 1.60 microns and a narrower water-ice spectral feature at 1.65 microns. The Hydra spectrum is similar to that of Pluto’s largest moon, Charon, which is also dominated by crystalline water ice. But Hydra’s water-ice absorption bands are even deeper than Charon’s, suggesting that ice grains on Hydra’s surface are larger or reflect more light at certain angles than the grains on Charon. http://www.nasa.gov/feature/pluto-s-icy-moon-hydra |
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Sep 11 2016, 11:41 PM
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#38
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Junior Member Group: Members Posts: 80 Joined: 18-October 15 From: Russia Member No.: 7822 |
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Sep 11 2016, 11:59 PM
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#39
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Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Fantastic, Roman!
-------------------- 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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Sep 12 2016, 02:12 AM
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#40
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
That is very impressive!
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Sep 12 2016, 02:18 AM
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#41
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Senior Member Group: Members Posts: 1276 Joined: 25-November 04 Member No.: 114 |
WOW!
I wonder what you achieve with a paperclip and gum! |
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Sep 13 2016, 09:07 PM
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#42
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IMG to PNG GOD Group: Moderator Posts: 2251 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
This is awesome, especially when one keeps in mind that it is generated from only two images (looking at it without knowing I would have guessed it was generated from a greater number of images).
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Dec 12 2016, 05:34 PM
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#43
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Member Group: Members Posts: 568 Joined: 20-April 05 From: Silesia Member No.: 299 |
-------------------- Free software for planetary science (including Cassini Image Viewer).
http://members.tripod.com/petermasek/marinerall.html |
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Jan 24 2017, 09:33 PM
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#44
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Senior Member Group: Members Posts: 1887 Joined: 20-November 04 From: Iowa Member No.: 110 |
QUOTE During a previous epoch where Charon migrated away from Pluto, the minor satellites could have been trapped in orbital mean motion inclination resonances. An outward migrating Charon induces large variations in Nix and Styx's obliquities. The cause is a commensurability between the mean motion resonance frequency and the spin precession rate of the spinning body. As the minor satellites are near mean motion resonances, this mechanism could have lifted the obliquities of all four minor satellites. If so the high obliquities of Pluto and Charon's minor satellites imply that this system experienced orbital migration and all satellites were at one time captured into mean motion resonances. https://arxiv.org/abs/1701.05594 |
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