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Ceres High Altitude Mapping Orbit (HAMO), Late summer through fall 2015
fredk
post Dec 11 2015, 04:55 AM
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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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David Wright
post Dec 11 2015, 05:11 AM
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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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Bill Harris
post Dec 11 2015, 03:00 PM
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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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ZLD
post Dec 11 2015, 06:21 PM
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HAMO 75





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TheAnt
post Dec 13 2015, 02:22 PM
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QUOTE (Bill Harris @ Dec 10 2015, 03:05 PM) *
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. tongue.gif~

So yes, Merry Christmas to you all of this forum! smile.gif
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Bill Harris
post Dec 14 2015, 03:52 PM
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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... wink.gif

--Bill



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fredk
post Dec 14 2015, 05:41 PM
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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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ZLD
post Dec 14 2015, 07:18 PM
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HAMO 76





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Req
post Dec 15 2015, 03:27 AM
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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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Phil Stooke
post Dec 15 2015, 03:40 AM
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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


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Habukaz
post Dec 15 2015, 11:24 AM
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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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JohnVV
post Dec 16 2015, 04:11 AM
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some 3d views of HAMO 76



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ZLD
post Dec 16 2015, 06:02 PM
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HAMO 77



HAMO 78





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Daniele_bianchin...
post Dec 17 2015, 12:05 PM
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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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Bill Harris
post Dec 18 2015, 12:58 AM
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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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