IPB

Welcome Guest ( Log In | Register )

15 Pages V  < 1 2 3 4 > »   
Reply to this topicStart new topic
Ceres Low-Altitude Mapping Orbit (LAMO)
ZLD
post Jan 15 2016, 07:37 PM
Post #16


Member
***

Group: Members
Posts: 555
Joined: 27-September 10
Member No.: 5458



LAMO 7
Blog Post





--------------------
Go to the top of the page
 
+Quote Post
JohnVV
post Jan 17 2016, 06:06 AM
Post #17


Member
***

Group: Members
Posts: 890
Joined: 18-November 08
Member No.: 4489



a few low angle views from LAMO-6
PIA20296
Go to the top of the page
 
+Quote Post
JohnVV
post Jan 20 2016, 04:00 AM
Post #18


Member
***

Group: Members
Posts: 890
Joined: 18-November 08
Member No.: 4489



some more renderings

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


Go to the top of the page
 
+Quote Post
ZLD
post Jan 20 2016, 04:42 AM
Post #19


Member
***

Group: Members
Posts: 555
Joined: 27-September 10
Member No.: 5458



LAMO 8
My blog post





--------------------
Go to the top of the page
 
+Quote Post
ZLD
post Jan 21 2016, 04:22 PM
Post #20


Member
***

Group: Members
Posts: 555
Joined: 27-September 10
Member No.: 5458



LAMO 9
My blog post





--------------------
Go to the top of the page
 
+Quote Post
ZLD
post Jan 24 2016, 12:14 AM
Post #21


Member
***

Group: Members
Posts: 555
Joined: 27-September 10
Member No.: 5458



My blog post

LAMO 10




LAMO 11








--------------------
Go to the top of the page
 
+Quote Post
ZLD
post Jan 25 2016, 08:17 PM
Post #22


Member
***

Group: Members
Posts: 555
Joined: 27-September 10
Member No.: 5458



My blog post
LAMO 12





--------------------
Go to the top of the page
 
+Quote Post
ZLD
post Jan 26 2016, 08:17 PM
Post #23


Member
***

Group: Members
Posts: 555
Joined: 27-September 10
Member No.: 5458



My blog post
LAMO 13





--------------------
Go to the top of the page
 
+Quote Post
Gladstoner
post Jan 26 2016, 08:46 PM
Post #24


Member
***

Group: Members
Posts: 714
Joined: 3-January 08
Member No.: 3995



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.
Go to the top of the page
 
+Quote Post
ZLD
post Jan 26 2016, 09:52 PM
Post #25


Member
***

Group: Members
Posts: 555
Joined: 27-September 10
Member No.: 5458



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...


--------------------
Go to the top of the page
 
+Quote Post
Ken2
post Jan 26 2016, 11:21 PM
Post #26


Junior Member
**

Group: Members
Posts: 48
Joined: 20-December 14
Member No.: 7370



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?
Go to the top of the page
 
+Quote Post
JohnVV
post Jan 27 2016, 12:37 AM
Post #27


Member
***

Group: Members
Posts: 890
Joined: 18-November 08
Member No.: 4489



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
Go to the top of the page
 
+Quote Post
Gladstoner
post Jan 27 2016, 02:19 AM
Post #28


Member
***

Group: Members
Posts: 714
Joined: 3-January 08
Member No.: 3995



Occator and Dantu: Before and after?

Attached Image


Possibly analogous features marked:

Attached Image


Can't wait to see the Occator close-ups....
Go to the top of the page
 
+Quote Post
Bill Harris
post Jan 27 2016, 03:21 AM
Post #29


Senior Member
****

Group: Members
Posts: 2997
Joined: 30-October 04
Member No.: 105



The Asterisk Central peaks are likely volcanic.

--Bill


--------------------
Go to the top of the page
 
+Quote Post
ZLD
post Jan 27 2016, 09:29 AM
Post #30


Member
***

Group: Members
Posts: 555
Joined: 27-September 10
Member No.: 5458



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.


--------------------
Go to the top of the page
 
+Quote Post

15 Pages V  < 1 2 3 4 > » 
Reply to this topicStart new topic

 



RSS Lo-Fi Version Time is now: 28th March 2024 - 09:46 AM
RULES AND GUIDELINES
Please read the Forum Rules and Guidelines before posting.

IMAGE COPYRIGHT
Images posted on UnmannedSpaceflight.com may be copyrighted. Do not reproduce without permission. Read here for further information on space images and copyright.

OPINIONS AND MODERATION
Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators.
SUPPORT THE FORUM
Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member.