Jezero Delta Campaign, Sols 414-1000, 21 Apr 2022- 23 Dec 2023 Options

[HSchirmer]

Sol 467 Mastcam-Z left eye filter 0 (RGB) color-enhanced image and anaglyph
[attachment=51256:ZL0_0467...164_pca_.jpg] [attachment=51257:ZR0_0467...naglyph_.jpg]
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.

Curious, it looks like there may be another fragment?

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[Cherurbino]

Attachment: a small smooth rolled pebble in 8× magnification.

Context: sol 467, ZL0_0467_0708387668_428EBY_N0260756ZCAM08487_1100LMJ01

442px from left, 43 px from the top of this original raw photo (including black margins)

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[Cherurbino]

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.

At this point it's a good reason to think about the non-zero probability of the event when next time the wind shall lift this piece of aluminium-covered material again and throw it on the rover. Especially onto the naked wires of the MEDA sensor.

[tau]

Regarding the sol 466 SuperCam Remote Micro-Imager mosaic in this post:

Did we get a context image of this target yet, just wondering of it's in the RA Workspace to try and get an idea of scale

Meanwhile we did, but it was the proverbial search for the needl in a haystack.
A Mastcam-Z stereo-pair of the vein was taken on sol 461 from an earlier waypoint.
The calculated distance to the stone with the vein was about 19 m on sol 461.
That gives a width of the entire Supercam RMI mosaic of about 70 mm, and a thickness of the vein of about 4 to 7 mm.
The Supercam images of the vein were taken on sol 466 from a shorter distance (roughly estimated about 3 m).

Here are the context images:
1. Sol 461 Mastcam-Z, site 26 drive 470
2. Sol 464 Navcam, site 26 drive 694, blue dot above the image center
3. Sol 464 Navcam, site 26 drive 756
4. Sol 464 Navcam, site 26 drive 756 (3. and 4. same site and drive as the Supercam image)

1 . . 2 . . 3 . . 4

Links to original raw images: link1, link2, link3, link4

[tau]

Regarding the perforation of the thermal blanket piece:

See the Red Book of Sheldahl, p. 15 and further on

Thank you, Cherurbino, for your information.
I couldn't find a pattern in the book that matches well with the one on Mars.
Maybe, the imaged material does not have a standard perforation pattern, or it is from another provider,
or perspective shortening does not allow an exact calculation of the pattern on Mars.

[tdemko]

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.

Martian beasties must have had three sets of chompers!

It looks like wind-enhanced differential weathering of cementation. Some minerals, especially carbonates, exhibit a cone-shaped pattern as the cement precipitates in the pore spaces of the rock or sediment. A least in this piece of float, it looks like there were at least three times in which the precipitation stopped and started, nucleating on the previous episode.

Check out these terrestrial examples:

Cone-in-cone

Multiple cone-in-cone layers at Lyme Regis

from this paper:

Beef and cone-in-cone calcite fibrous cements associated with the end-Permian and end-Triassic mass extinctions: Reassessment of processes of formation

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[tau]

And what's that?
Detail in a sol 467 Mastcam-Z image, enlarged and enhanced

[PaulH51]

Great images guys

Here's a new handy dandy info page that recently appeared on the main mission page. Or you can access it directly on this link

It provides details on the cores and atmospheric samples acquired (so far) on the mission, some of the details are new (to me) including core length and rock type.

[Phil Stooke]

And what's that?
Detail in a sol 467 Mastcam-Z image, enlarged and enhanced

Those are Shiitake mushrooms.

Phil

[tdemko]

And what's that?

Although I love Phil’s answer, I’m going to go with concretions. As with the previous cone/teeth structures, concretions and nodules are also cement phenomena. However, this time the pore fluid flow and geochemical gradients were such that the cement precipitated in spherical to mushroom shaped masses, rather than cones. I’d attribute the flat tops to some kind of permeability boundary that prevented upward cementation past it.

I make the differentiation between concretions and nodules at obvious compositional banding or layering (concretion) and more or less uniform masses (nodules), although there can also be differences in whether the cement is pore-filling (concretions) or displacive (nodules).

The broken one shows some very obvious compositional banding, with a lighter internal band, possibly a sulfate mineral.

[nprev]

ADMIN MODE: Seems like a good time to remind everyone, esp. our newer members, to carefully read the Rules and Guidelines section with particular attention to rule 1.3.

Pareidolia is entertaining, but if it's given any credence whatsoever it's tin-hat time. We don't do that here. Period.

Thanks.

[Cherurbino]

Regarding the perforation of the thermal blanket piece:
Thank you, Cherurbino, for your information.
I couldn't find a pattern in the book that matches well with the one on Mars.

And what about these two (p 16 and p.17, top)?

Maybe, the imaged material does not have a standard perforation pattern, or it is from another provider

I doubt that NASA has other provider than Sheldahl for this stuff. Sheldahl has supported lots of projects for 20 years, including Mars-2020.

or perspective shortening does not allow an exact calculation of the pattern on Mars.

Perspective distortion is what matters most of all in this case.
You have chosen the right way to start with perforation holes: we know that they are ideal circles.
After that you calculated the diameter which found to be very close to the Sheldahl's standard which is 0.0450.

The last step is to choose between the patterns.It seems to me that there are only two to choose from: 045-0270 (page 16) and 045-0405 (page 17, top)

Source: the Red Book of Sheldahl.

Additional information: https://mashable.com/article/nasa-mars-rove...ds-debris-trash

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[tau]

I didn't calculate the diameter of the holes in the image because they are quite small, just about two pixels in diameter in the raw images (about 0.05 inch).
According to the anaglyph we are looking almost perpendicularly at the sheet. Apparently it has a 60° staggered perforation pattern.
The distance between neighboring holes is about 1.25 cm (about 0.49 inch), calculated by stereophotogrammetry.
The most similar type in the catalog is 045-0405, but its distance between neighboring holes is 0.405 inch = 1.0287 cm, which is 18 % less.
When scaling the drawing in the book so that 1 inch of the drawing is equal to 1 inch on the piece on Mars, as in the image below, the patterns do not match.
Even scaling and projecting the other patterns in the book by looking at them at an angle (not perpendicularly), I haven't found one that fits.

[tau]

Back from terrestrial material to Martian geology with a sol 467 Mastcam-Z anaglyph (enlarged).
The protruding thing (concretion?) at 1400 pixels from the left and 240 pixels from the top is 11 mm in diameter.
The smaller round ones on the rock in the center of the image are about 2 mm in diameter.
The distance from the camera was about 2.9 m.

[neville thompson]

Gigapan - PERSEVERANCE 459
© NASA/JPL-Caltech/MSSS/ASU/NeV-T