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Full Version: Ceres Low-Altitude Mapping Orbit (LAMO)
Unmanned Spaceflight.com > Other Missions > Cometary and Asteroid Missions > Dawn
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Bill Harris
Hit http://photojournal.jpl.nasa.gov/keywords/dp .

The first LAMOs are here.

--Bill
craigmcg
LAMOs are going to be good.

Gladstoner
Holy image compression Batman:

http://photojournal.jpl.nasa.gov/catalog/PIA20185
Bill Harris
Something went very wrong there-- my first impression was "need to deinterlace" but it's too blocky for that.

I'm having a time figuring out what is where on these wrt the HAMOs. The shots are oblique and I'm not accustomed to the scale. I'll be better once I find the epiphany of a landmark or two.

The Azacca Crater (??) / Samhain Catena area of the LAMO images pia20184 pia20185 and pia20186 may be covered by HAMO images HO-9, 27, 42, 45 and Survey Orbit images SO-11, 48.

--Bill
JohnVV
QUOTE
Holy image compression Batman:

no kidding !!! -- a zoom of the tiff


or

Click to view attachment
nprev
Looks like we're there now! Press release. Probably gonna be a bit slow for a couple of days due to US holidays, but please post all relevant discussion here; thanks!
craigmcg
... very slow :-)
charborob
Spectacular! Unfortunately, the TIFF files on the Photojournal are identical to the JPEG files, that is, they are affected by JPEG artifacts. I wonder why they bother to post the TIFF images. There should be much more detail in the uncompressed images, whenever they become available.
GS_Brazil
Looking at the white spot, I see it's made of several smaller white spots, just like in the Occator crater.

http://photojournal.jpl.nasa.gov/jpegMod/PIA20193_modest.jpg
craigmcg
QUOTE (ZLD @ Jan 12 2016, 10:24 AM) *
Funny that you chose today to post to this thread.


Maybe I reminded the powers that be... laugh.gif smile.gif
antipode
Look at the floor of Dantu!

http://photojournal.jpl.nasa.gov/jpegMod/PIA20193_modest.jpg

wowowowow. Impact melt craziness? And the obligatory white patch.

P

Edit: actually reminds me a bit of the 'spider' at the center of Caloris on mercury. Different materials of course but...
ZLD
Since they haven't started designating LAMO images with numbers, I'm lettering them until they do.

LAMO F



LAMO G



LAMO H



LAMO I





ZLD
LAMO 5



ZLD
LAMO 6



ZLD
LAMO 7
Blog Post



JohnVV
a few low angle views from LAMO-6
PIA20296
JohnVV
some more renderings

This time "Kupalo Crater"
http://dawn.jpl.nasa.gov/multimedia/images...tml?id=PIA20192


ZLD
LAMO 8
My blog post



ZLD
LAMO 9
My blog post



ZLD
My blog post

LAMO 10




LAMO 11






ZLD
My blog post
LAMO 12



ZLD
My blog post
LAMO 13



Gladstoner
QUOTE (ZLD @ Jan 26 2016, 02:17 PM) *

Fascinating features.

So what's with those radiating 'bird feet'? If I saw those hills on Earth, I'd think they were an erosional remnant of a larger mountain. But on Ceres, there is no apparent process to remove the material in such a manner.
ZLD
My best guess is that right after impact, the basin uplifted into something resembling the central ridge you see, and as it rapidly cooled, the exterior sort-of buckled inwards as it compressed from cooling unevenly. This would only be possible if this region is heavier in rocky material.

I will say, I am especially intrigued by the feature at center left, along the central ridge. Tall peak, central pit, who knows...
Ken2
QUOTE (Gladstoner @ Jan 26 2016, 12:46 PM) *
Fascinating features.

So what's with those radiating 'bird feet'? If I saw those hills on Earth, I'd think they were an erosional remnant of a larger mountain. But on Ceres, there is no apparent process to remove the material in such a manner.



I favor the least interesting explanation as evident in LAMO G, I think it's due to settling and sliding of the puffy ejecta in-fill of the craters.

Most craters* start out as an empty cones, and in-fill by their ejecta and landslides, and the ejecta of countless other craters. The craters are filled of unstable relatively puffy fine-grained ejecta. Subsequent impacts cause huge Ceres-quakes which will cause landslides (clearly evident all over the place) and settling, which I believe is the majority of the cracks on crater floors.


*Most craters (other then young ones big enough to have lava in-fill at the time of creation, and very large ones (I don't know what that size is on Ceres, and it's probably a function of age))
e.g. old (earliest) craters have a harder surface which may rebound more. Also assuming it was mostly a molten interior at the time of formation, then the lava in-fill (and after a given crater could no longer expose lava) then elastic rebound would be decreasing as a function of age. The later craters would be formed in a puffy impact gardened surface which looks to be km thick. An impact in a loosely bound matrix would evacuate a clean cone and then have severe landslides back into the pit. It's even possible that most of the central peaks are in fact landslide conjunctions (i.e. if there are landslides all around the craters they would meet in the middle and after a few met the forming ridge/peak would accumulate subsequence landslide terminating debris as the crater in-filled. I think these type of processes may explain the majority of Cere's crater's features. I wonder what magnitude Cere's quake is generated for a given impact diameter and distance from the impact?
JohnVV
impact , stresses, land movement and so on

i bet that when the papers start coming out it will be many things all having a part

No 3d renderings yet , just a heightmap
-- 8 bit normalized 0,255
Gladstoner
Occator and Dantu: Before and after?

Click to view attachment

Possibly analogous features marked:

Click to view attachment

Can't wait to see the Occator close-ups....
Bill Harris
The Asterisk Central peaks are likely volcanic.

--Bill
ZLD
I'd like them to be volcanic as well but there's little to show they are. No visible flows anywhere really. Not that they couldn't have long since been erased, but there's no evidence to push for it. Several mound-like features are present with what would seem to be central depressions.

Also, interesting comparison Gladstoner. I definitely think there is some resemblance here. However, I have to wonder that if they have been through similar processes, in regards to Dantu, why has a small patch of bright material near the cracks remained while everything else has disappeared, especially a bright central patch of it in the center of the central ridge. One possibility is that it has been recently active, long after most of the bight material was covered up or insolation caused the material to become less reflective. But if it was recently active, then how? Strange place.
Habukaz
QUOTE
Re: spots: I'm taking pics of small parts of Ceres, covering it over time. Don't have good Occator pics yet; eventually I will. Stay tuned!


https://twitter.com/NASA_Dawn/status/692099462332682241

Haven't seen or heard any word on the mountain, yet.
Bill Harris
My idea is that the really good LAMO images are spectacular and good material for papers, so they've not released them in the dozen-or-so daily images. After the papers get out and the data hits the PDS we'll have some jaw-droppers. Time will tell.

--Bill
ZLD
My blog post
LAMO 14



Gladstoner
QUOTE (ZLD @ Jan 27 2016, 03:29 AM) *
I definitely think there is some resemblance here. However, I have to wonder that if they have been through similar processes, in regards to Dantu, why has a small patch of bright material near the cracks remained while everything else has disappeared, especially a bright central patch of it in the center of the central ridge. One possibility is that it has been recently active, long after most of the bight material was covered up or insolation caused the material to become less reflective. But if it was recently active, then how?

Yes, we may be seeing two different stages of the life cycle of some 'volcanic' process. The sparse white spots in Dantu could be the (relatively recent) dying gasps of activity. For an earthly analogy, I'm thinking along the lines of the cinder cones atop the dormant Mauna Kea (Hawaii) vs. the more robust lava flows from the younger Mauna Loa.
Daniele_bianchino_Italy
I think it is a central peak, some as seen on the Moon or Mercury. I study enough geology, and volcanoes. I honestly don't see a signs of volcanic activity. However, I don 't know what form would a volcano over a small body without gravity 'as Ceres.
These is the only structures that seem cones, but perhaps just a coincidence ..



This is a volcanic chain of example, not very clear volcano, but an expert recognizes obvious signs of volcano, although it is a not classical volcano

JohnVV
low angle renderings of that "volcano?"


bare mesh, mesh and a gray shader, mesh and the image texture
Gladstoner
QUOTE (Daniele_bianchino_Italy @ Jan 27 2016, 07:15 PM) *
I think it is a central peak, some as seen on the Moon or Mercury. I study enough geology, and volcanoes. I honestly don't see a signs of volcanic activity. However, I don 't know what form would a volcano over a small body without gravity 'as Ceres.
These is the only structures that seem cones, but perhaps just a coincidence ..

Plus, impact craters are more likely to be preserved on the summit of a mountain than on its slopes.
ZLD
LAMO 15

My blog post



Michael Capobianco
Finally, a look into Kerwan, the sand dollar.
Gladstoner
Looks like a mini Haulani:

Click to view attachment
ZLD
I didn't get to watch all of the SBAG Dawn presentation this morning. Hopefully I will get an update today from the NASA public affairs office about the recording and I will post it if available. From what I did see, it was a pretty good update to the status of the mission with lots of good slides and information. The slides should be posted by the end of the day which will include a pretty good shot of Haulani in LAMO. Below is a screen grab.

Click to view attachment

Also posted today was a nice animation from DLR, of a simulated flyover of Ceres, similar to the previous animation but with much higher resolution. Link
ZLD
LAMO 16
My blog post



Ken2
QUOTE (Gladstoner @ Jan 26 2016, 12:46 PM) *
Fascinating features.

So what's with those radiating 'bird feet'? If I saw those hills on Earth, I'd think they were an erosional remnant of a larger mountain. But on Ceres, there is no apparent process to remove the material in such a manner.


QUOTE (Ken2 @ Jan 26 2016, 03:21 PM) *
I favor the least interesting explanation as evident in Kupalo Crater from LAMO PIA20192, I think it's due to settling and sliding of the puffy ejecta in-fill of the craters.

Most craters* start out as an empty cones, and in-fill by their ejecta and landslides, and the ejecta of countless other craters. The craters are filled of unstable relatively puffy fine-grained ejecta. Subsequent impacts cause huge Ceres-quakes which will cause landslides (clearly evident all over the place) and settling, which I believe is the majority of the cracks on crater floors.


*Most craters (other then young ones big enough to have lava in-fill at the time of creation, and very large ones (I don't know what that size is on Ceres, and it's probably a function of age))
e.g. old (earliest) craters have a harder surface which may rebound more. Also assuming it was mostly a molten interior at the time of formation, then the lava in-fill (and after a given crater could no longer expose lava) then elastic rebound would be decreasing as a function of age. The later craters would be formed in a puffy impact gardened surface which looks to be km thick. An impact in a loosely bound matrix would evacuate a clean cone and then have severe landslides back into the pit. It's even possible that most of the central peaks are in fact landslide conjunctions (i.e. if there are landslides all around the craters they would meet in the middle and after a few met the forming ridge/peak would accumulate subsequence landslide terminating debris as the crater in-filled. I think these type of processes may explain the majority of Cere's crater's features. I wonder what magnitude Cere's quake is generated for a given impact diameter and distance from the impact?


Just a visual update on my hypothesis:

Click to view attachment Kupalo Crater from LAMO PIA20192

The younger Kupalo Crater clearly shows landslide formed cracks and this view [below] from today's movie shows how the Dantu settling/landslide fault line cracks are most likely the same mechanism. ZLD's screen grab today (previous post) of Haulani in LAMO shows similar landslide cracks. Also the Kupalo and Dantu landslides both appear to end at the central "peak" area with a linear terminus pile-up. Note that landslides in .028g should travel much further then in 1g on earth.

Click to view attachment
ZLD
LAMO 17
My blog post



JohnVV
A few low angle renders from LAMO 16
http://photojournal.jpl.nasa.gov/catalog/PIA20306

ZLD
LAMO 18

My blog post



JohnVV
lamo 18 - PIA20308

low angle illumination like this ( approx. 10Deg. ) is pushing things a bit
this required a lot of manual editing to correct the dem used

i had it inpaint the shadows and dodge and burn the heightmap
the first of the two is just a rendered mesh
the second has the texture draped over it





ZLD
LAMO 19

My blog post



ZLD
LAMO 20

My blog post



ZLD
LAMO 21

My blog post



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