IPB

Welcome Guest ( Log In | Register )

23 Pages V   1 2 3 > »   
Reply to this topicStart new topic
Finishing work in and around Seitah, sols 238-378
Phil Stooke
post Oct 21 2021, 06:50 AM
Post #1


Solar System Cartographer
****

Group: Members
Posts: 10127
Joined: 5-April 05
From: Canada
Member No.: 227



It's time to start a new thread - this will cover the remaining work in Seitah and the drive back to the landing site.

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)
Go to the top of the page
 
+Quote Post
Phil Stooke
post Oct 22 2021, 12:13 AM
Post #2


Solar System Cartographer
****

Group: Members
Posts: 10127
Joined: 5-April 05
From: Canada
Member No.: 227



OK, a drive up to the outcrop on sol 238. Here is a circular view of the new location.

Phil

Attached Image


--------------------
... 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)
Go to the top of the page
 
+Quote Post
tau
post Oct 22 2021, 12:13 PM
Post #3


Member
***

Group: Members
Posts: 659
Joined: 9-May 21
From: Germany
Member No.: 9017



An outcrop of compact, layered rock with overlying vesicular rock fragments on sol 238.
Mastcam-Z left eye filter 0 (RGB), colors enhanced.

Attached Image
Go to the top of the page
 
+Quote Post
Bill Harris
post Oct 22 2021, 04:19 PM
Post #4


Senior Member
****

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



Tau, this stratigraphy is getting interesting.
Time to backtrack and try to intuit the bedding orientation.

--Bill


--------------------
Go to the top of the page
 
+Quote Post
serpens
post Oct 22 2021, 10:16 PM
Post #5


Senior Member
****

Group: Members
Posts: 1043
Joined: 17-February 09
Member No.: 4605



Perseverance had a pretty fair tilt when this was taken and these are probably as horizontal as the precious ridge.
Go to the top of the page
 
+Quote Post
Phil Stooke
post Oct 23 2021, 12:46 AM
Post #6


Solar System Cartographer
****

Group: Members
Posts: 10127
Joined: 5-April 05
From: Canada
Member No.: 227



Sol 239, another drive... another circular panorama.

Phil

Attached Image


--------------------
... 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)
Go to the top of the page
 
+Quote Post
serpens
post Oct 23 2021, 01:20 AM
Post #7


Senior Member
****

Group: Members
Posts: 1043
Joined: 17-February 09
Member No.: 4605



QUOTE (tau @ Oct 22 2021, 12:13 PM) *
An outcrop of compact, layered rock with overlying vesicular rock fragments on sol 238.


To me this looks more like honeycomb weathering of basaltic sandstone rather than vesicular basalt tau, but I stand to be corrected.
Go to the top of the page
 
+Quote Post
tau
post Oct 23 2021, 12:45 PM
Post #8


Member
***

Group: Members
Posts: 659
Joined: 9-May 21
From: Germany
Member No.: 9017



If the term "vesicular" implies a specific type of rock or origin of the rock, then I would rather refer to it as "spongeous appearance".
I would not rule out weathering as the reason of the small holes/cavities.
Go to the top of the page
 
+Quote Post
tau
post Oct 23 2021, 07:18 PM
Post #9


Member
***

Group: Members
Posts: 659
Joined: 9-May 21
From: Germany
Member No.: 9017



QUOTE (Bill Harris @ Oct 22 2021, 06:19 PM) *
Tau, this stratigraphy is getting interesting.
Time to backtrack and try to intuit the bedding orientation.

QUOTE (serpens @ Oct 23 2021, 12:16 AM) *
Perseverance had a pretty fair tilt when this was taken and these are probably as horizontal as the precious ridge.

As to the bedding orientation, here is a sol 236 Navcam image with the sol 238 Mastcam-Z image as inset. If there is any tilt of the rover, it seems to be rather small.
Navcam and Mastcam-Z are looking east-northeast. The layers are dipping to the right, i.e., towards the Artuby ridge.
This is consistent with the Rimfax results in the screenshot below, which is from a presentation by Kathryn Stack Morgan. Thanks to cIclops for the link to this very interesting video!
The part about Rimfax and Séítah layering begins after 21 minutes. Here is a direct link to this part.

The field of view of the sol 238 Mastcam-Z image and the position of Perseverance on sol 239 are marked in the upper right section of a helicopter photo from sol 174.

Attached Image
Attached Image
Attached Image


EDIT: Corrected the compass direction that the Navcam and Mastcam-Z looked at. I had accidentaly typed west where I meant east. The correct direction is east-nordeast.
Go to the top of the page
 
+Quote Post
Bill Harris
post Oct 23 2021, 07:31 PM
Post #10


Senior Member
****

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



I haven't had the chance to look at that video presentation yet.
The RIMFAX data fairly well corresponds to my general observations. In a general sense, the "beds are essentially flat-lying with a gentle regional dip to the southwest". Artuby ridge is stratigraphically the high point of this section of the traverse and we are headed along stratigraphically lower units. And Artuby is the youngest unit, and we are traversing along increasingly older units.

Nice presentation of yours.

--Bill


--------------------
Go to the top of the page
 
+Quote Post
serpens
post Oct 23 2021, 10:49 PM
Post #11


Senior Member
****

Group: Members
Posts: 1043
Joined: 17-February 09
Member No.: 4605



Indeed, good one tau. The Rimfax trace doesn't show any real change in the angle of dip despite a 90 degree turn across the terrain, not that I have any skill whatsoever in interpreting such.

The reason I suspected an element of tilt was due to this Sol 238 Navcam image.
Attached thumbnail(s)
Attached Image
 
Go to the top of the page
 
+Quote Post
Phil Stooke
post Oct 24 2021, 12:07 AM
Post #12


Solar System Cartographer
****

Group: Members
Posts: 10127
Joined: 5-April 05
From: Canada
Member No.: 227



That picture was taken at the sol 238 location, but Tau's image was from the sol 237 location, before the drive on sol 238.

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)
Go to the top of the page
 
+Quote Post
PaulH51
post Oct 24 2021, 10:45 AM
Post #13


Senior Member
****

Group: Members
Posts: 2425
Joined: 30-January 13
From: Penang, Malaysia.
Member No.: 6853



4x4 Navcam tile of Perseverance's post-drive workspace on sol 239.
Very roughly assembled and reduced to fit upload limits
Attached Image
Go to the top of the page
 
+Quote Post
tau
post Oct 24 2021, 04:41 PM
Post #14


Member
***

Group: Members
Posts: 659
Joined: 9-May 21
From: Germany
Member No.: 9017



QUOTE (serpens @ Oct 23 2021, 12:16 AM) *
Perseverance had a pretty fair tilt when this was taken and these are probably as horizontal as the precious ridge.

The tilt of the previously shown sol 238 Mastcam-Z picture can be estimated with the projection of the images onto a sphere provided online by marslife.org.
The mast was tilted about 4° to the left (that's more than I presumed from the Navcam photos). When we apply the tilt to the picture, the layers are still tilted to the right (towards Artuby ridge) with an angle of about 7° to 8°.
This is in accordance with the Rimfax results where we have a dip angle of about 12° towards Artuby ridge.

Attached Image
Attached Image

Go to the top of the page
 
+Quote Post
Bill Harris
post Oct 24 2021, 09:15 PM
Post #15


Senior Member
****

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



This site you noted, https://marslife.org/ , looks interesting and potentially useful. Let me dig around and find documentation on the site.

--Bill


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

23 Pages V   1 2 3 > » 
Reply to this topicStart new topic

 



RSS Lo-Fi Version Time is now: 28th March 2024 - 04:45 PM
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.