Jezero Delta Campaign, Sols 414-1000, 21 Apr 2022- 23 Dec 2023 |
Jezero Delta Campaign, Sols 414-1000, 21 Apr 2022- 23 Dec 2023 |
Jun 11 2022, 08:19 PM
Post
#181
|
|
Member Group: Members Posts: 680 Joined: 9-May 21 From: Germany Member No.: 9017 |
|
|
|
Jun 12 2022, 05:10 PM
Post
#182
|
|
Member Group: Members Posts: 680 Joined: 9-May 21 From: Germany Member No.: 9017 |
|
|
|
Jun 12 2022, 07:38 PM
Post
#183
|
|
Member Group: Members Posts: 684 Joined: 24-July 15 Member No.: 7619 |
|
|
|
Jun 12 2022, 08:22 PM
Post
#184
|
|||
Member Group: Members Posts: 680 Joined: 9-May 21 From: Germany Member No.: 9017 |
Sol 466 SuperCam Remote Micro-Imager mosaic with three laser holes (no context image available yet).
The SuperCam mosaic reminds me of veins of fibrous gypsum in claystone (see second photo) that I found just a few days ago on a small Gipskeuper formation hill in Thuringia. It would be a nice coincidence if also Perseverance had found a vein of fibrous gypsum. |
||
|
|||
Jun 12 2022, 10:54 PM
Post
#185
|
|
Senior Member Group: Members Posts: 1074 Joined: 21-September 07 From: Québec, Canada Member No.: 3908 |
|
|
|
Jun 13 2022, 04:10 PM
Post
#186
|
|
Member Group: Members Posts: 384 Joined: 4-January 07 Member No.: 1555 |
Virtually all the white Mars veins and veinlets probably consist of Ca-sulfates, but daily and seasonal temperature and humidity variations can cause apparent amorphization of surface sulfates (Ca-sulfates cycle among gypsum and the less hydrous forms bassanite and anhydrite). Therefore, nice fibrous gypsum crystals are unlikely at the surface. You might find them if you could dig.
dburt |
|
|
Jun 13 2022, 08:16 PM
Post
#187
|
|
Member Group: Members Posts: 810 Joined: 3-June 04 From: Brittany, France Member No.: 79 |
Mastcam-Z Left mosaic made of 123 pictures taken on sol 466 (12 June, 2022) at 12:20 LMST.
Also on Gigapan. -------------------- |
|
|
Jun 14 2022, 11:08 AM
Post
#188
|
|
Senior Member Group: Members Posts: 2429 Joined: 30-January 13 From: Penang, Malaysia. Member No.: 6853 |
|
|
|
Jun 14 2022, 12:44 PM
Post
#189
|
||
Member Group: Members Posts: 810 Joined: 3-June 04 From: Brittany, France Member No.: 79 |
Indeed, it really looks like a piece of multi-layer insulation. See this picture in the JPL shield shop from https://www.nasa.gov/image-feature/jpl/meet...raft-dressmaker
-------------------- |
|
|
||
Jun 14 2022, 01:32 PM
Post
#190
|
|||
Member Group: Members Posts: 680 Joined: 9-May 21 From: Germany Member No.: 9017 |
Sol 467 Mastcam-Z left eye filter 0 (RGB) color-enhanced image and anaglyph
Edit Deleted size and distance values, have to check my calculations. Does anybody know the exact distance between neighboring pinholes in the thermal blanket material? Second edit Here are the results (without guarranty) of stereophotogrammetry again: The distance from Mastcam-Z to the thermal blanket material is about 10.4 meter. The size of the visible part is about 21 cm. The distance between neighboring small holes in the material is about 1.25 cm (about half an inch). |
||
|
|||
Jun 14 2022, 05:00 PM
Post
#191
|
||||
Member Group: Members Posts: 680 Joined: 9-May 21 From: Germany Member No.: 9017 |
But much more interesting than the lost EDL hardware parts are the Martian rocks in a sol 467 Mastcam-Z image,
especially the one with the textured surface in the upper right part of the image. Is the texture an effect of wind abrasion, or reflects it an internal property of the rock, or both? Distance to the rock about 4.4 m, size about 2.6 cm (calculation results as usual without guarranty). |
|||
|
||||
Jun 14 2022, 07:28 PM
Post
#192
|
|
Member Group: Members Posts: 810 Joined: 3-June 04 From: Brittany, France Member No.: 79 |
Just to share my calculations regarding the piece of (likely) thermal material that has been imaged: located at ~10.5m, it's 18cm x 10 cm.
Assuming a wind speed of 15 m/s (maximum measured by MEDA as far as I know), with a drag coefficient of 1.05 (cubic section, that's the closer I found), I compute a drag force of 0.044 N. If the material is composed of Mylar (volumic mass = 1.38 g/cm^3), a layer of 6 µm has a weight of 0.00057 N. So this drag force could lift a material composed of about 76 layers of Mylar. Hence, it seems plausible that wind alone moved that thermal material. -------------------- |
|
|
Jun 14 2022, 08:27 PM
Post
#193
|
|
Member Group: Members Posts: 680 Joined: 9-May 21 From: Germany Member No.: 9017 |
Merci beaucoup, Thomas, for your calculations.
The difference between our independently determined distances to the object is about one percent, which is a very good agreement and dispels my doubts about my results. The size of 21 cm I calculated is the largest diagonal of the piece, respectively the smallest diameter of a circle that contains the piece completely. |
|
|
Jun 14 2022, 08:48 PM
Post
#194
|
|
Senior Member Group: Members Posts: 2429 Joined: 30-January 13 From: Penang, Malaysia. Member No.: 6853 |
|
|
|
Jun 15 2022, 11:03 AM
Post
#195
|
|
Junior Member Group: Members Posts: 91 Joined: 11-August 21 Member No.: 9072 |
Does anybody know the exact distance between neighboring pinholes in the thermal blanket material? out 1.25 cm (about half an inch). See the Red Book of Sheldahl, p. 15 and further on |
|
|
Lo-Fi Version | Time is now: 1st June 2024 - 08:45 AM |
RULES AND GUIDELINES Please read the Forum Rules and Guidelines before posting. IMAGE 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. |