Ceres High Altitude Mapping Orbit (HAMO), Late summer through fall 2015 |
Ceres High Altitude Mapping Orbit (HAMO), Late summer through fall 2015 |
Dec 11 2015, 04:55 AM
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#406
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Senior Member Group: Members Posts: 4245 Joined: 17-January 05 Member No.: 152 |
Those polar maps are composites of several images. Those brighter patches you point to look like artifacts from reprojecting and compositing the images.
Welcome to UMSF! Edit - scooped by Emily! |
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Dec 11 2015, 05:11 AM
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#407
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Newbie Group: Members Posts: 9 Joined: 22-November 15 Member No.: 7847 |
Well, thanks Fred and Emily for the fast responses.
I found this site during the run-up to New Horizons at Pluto, am enjoying the detailed discussion. David |
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Dec 11 2015, 03:00 PM
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#408
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Senior Member Group: Members Posts: 2997 Joined: 30-October 04 Member No.: 105 |
Although these "slumpage and flowage" mass wasting features may be ice-related ("glacial", in terrestrial terms) not all are convinced at this time that they are ice-related. These peculiar features were first noticed during the Survey Orbit (SO-xx) phase and differences were noted between slumps internal to craters and flows external to craters, therefore the somewhat informal terms "slumpage and flowage" are adopted until the community decides on a nomenclature. Much easier to say than "mass wasting feature of unknown provenance external/internal to a crater". My photosite has images and discussions of features that we are observing on Ceres: https://univ.smugmug.com/Dawn-Mission/Ceres
We'll learn more now that Dawn is at the LAMO phase and can return higher resolution imagery and compositional data. --Bill -------------------- |
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Dec 11 2015, 06:21 PM
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#409
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Member Group: Members Posts: 555 Joined: 27-September 10 Member No.: 5458 |
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Dec 13 2015, 02:22 PM
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#410
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Member Group: Members Posts: 495 Joined: 12-February 12 Member No.: 6336 |
Remember that when looking across an area with grounds mists or fog that mist will show up looking parallel to the ground through a greater sight distance. Yes a view from the side put more of the haze in view as long as it stay on the crater floor. So that might very well the reason to show that particular image. While it might be difficult to see even nearly undetectable from above. And salts that might be magnesium sulphates. Also Oxo crater is thought to have a fumarole, a bit of possible haze seen there also. It's all good you keep an open mind for alternative explanations for the "slumpage and flowage" features. However I do think the alternative explanation would have to be even more exotic for at least for some of those features. Anyway, Dawn should indeed be on LAMO now so lets wait and see, and I am looking forward to this as much as any Christmas presents. ~ So yes, Merry Christmas to you all of this forum! |
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Dec 14 2015, 03:52 PM
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#411
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Senior Member Group: Members Posts: 2997 Joined: 30-October 04 Member No.: 105 |
The optimum lighting for the "ground hazes" would put the feature on the terminator so that the illumination angle is very low and the floor of the crater is in shadow while the mist is in sunlight. But the mechanics of going to a polar orbit temporarily over the terminator is probably too expensive, though they could let the orbit drift or precess that way later on. I suspect that those many "low sun" images in the south polar region were looking for that (or preparing to study "long-shadowed ice" in those craters.
I'm thinking that the explanation for those "slumpages and flowages" could be anything from mild to wild. But my public utterances tend to be conservative 'cause I don't want a reputation for being a Looney... --Bill -------------------- |
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Dec 14 2015, 05:41 PM
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#412
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Senior Member Group: Members Posts: 4245 Joined: 17-January 05 Member No.: 152 |
As far as the Occator haze, that was only claimed around local noon. The paper states that it completely disappears near dusk.
But you're right that sunlight skimming just over the crater floor would be a strong test for haze. |
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Dec 14 2015, 07:18 PM
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#413
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Member Group: Members Posts: 555 Joined: 27-September 10 Member No.: 5458 |
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Dec 15 2015, 03:27 AM
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#414
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Junior Member Group: Members Posts: 30 Joined: 15-June 15 Member No.: 7506 |
People have been cautious to speculate about the cause for the flat/young-looking crater floors on Ceres - I'm not so cautious, I'm going to come right out and say that I believe that anything that penetrated deeply spent some time forming these Occator-like fumaroles and hazes, and that was the process that eventually caused the localized topography before it stopped and became covered in(or was transformed into via radiation) the darker surface material more commonly seen.
Edit - Since I'm posting, according to http://www.nasa.gov/feature/jpl/dawn/new-c...ots-and-origins Dawn has been in LAMO since around the 9th - does anybody have any links or knowledge about why it takes another week to begin science observations? |
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Dec 15 2015, 03:40 AM
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#415
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Solar System Cartographer Group: Members Posts: 10122 Joined: 5-April 05 From: Canada Member No.: 227 |
They will want to measure the orbit very precisely, but it is also possible they have begun observations. One of the high priority datasets in LAMO is the gamma ray instrument, which can't be used higher up.
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke 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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Dec 15 2015, 11:24 AM
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#416
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Member Group: Members Posts: 423 Joined: 13-November 14 From: Norway Member No.: 7310 |
For detailed updates on Dawn - including on the LAMO insertion - see the Mission Status Updates. Some imagery should be taken tomorrow and/or the day after (16-17 December).
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Dec 16 2015, 04:11 AM
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#417
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
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Dec 16 2015, 06:02 PM
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#418
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Member Group: Members Posts: 555 Joined: 27-September 10 Member No.: 5458 |
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Dec 17 2015, 12:05 PM
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#419
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Member Group: Members Posts: 120 Joined: 26-May 15 From: Rome - Italy Member No.: 7482 |
Fantastic images HAMO.
I look forward for LAmo. :-) They were calculated temperatures over Ceres surface? absolute maximum temperature? Will be 'presented a surface temperatures map of Ceres? Thank s |
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Dec 18 2015, 12:58 AM
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#420
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Senior Member Group: Members Posts: 2997 Joined: 30-October 04 Member No.: 105 |
Image HAMO 79, centered on craters Juling and Kupalo. This area was also noted as Spot 3 by Hubble.prior to the Dawn mission to Ceres. This image was enlarged 2x at a scale of 70 meters/pixel.
Compare with the image of Kupalo uploaded earlier as "HAMO Image 6". https://univ.smugmug.com/Dawn-Mission/Ceres...-res2x--enh.png --Bill -------------------- |
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