APOD: Mars Perseverance Sol 3 (2021 Feb 26)

Comments and questions about the APOD on the main view screen.
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APOD: Mars Perseverance Sol 3 (2021 Feb 26)

Post by APOD Robot » Fri Feb 26, 2021 5:09 am

Image Mars Perseverance Sol 3

Explanation: Stitched together on planet Earth, 142 separate images make up this 360 degree panorama from the floor of Jezero Crater on Mars. The high-resolution color images were taken by the Perseverance rover's zoomable Mastcam-Z during mission sol 3, also known as February 21, 2021. In the foreground of Mastcam-Z's view is the car-sized rover's deck. Broad light-colored patches in the martian soil just beyond it were scoured by descent stage rocket engines during the rover's dramatic arrival on February 18. The rim of 45 kilometer-wide Jezero Crater rises in the distance. In the coming sols, Perseverance will explore the ancient lake-delta system in the crater, hunting for signs of past microscopic life and collecting samples for potential future return to planet Earth.

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steve case

Re: APOD: Mars Perseverance Sol 3 (2021 Feb 26)

Post by steve case » Fri Feb 26, 2021 5:25 am

... Perseverance will ...[collect] samples for potential future return to planet Earth.

Oh, I want to hear more about that.

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Re: APOD: Mars Perseverance Sol 3 (2021 Feb 26)

Post by Eclectic Man » Fri Feb 26, 2021 10:24 am

In the detailed view, I noticed that there are a lot of circular black and white 'target' type plaques installed on the upper surfaces of the rover.

Towards the top left, there is a coloured sundial, and just above and to the left of that is a plaque which appears to be missing the right-most part of its perimeter. So Perseverance must have suffered some damage during the descent and landing procedure.

Are there any other obvious signs of damage?

Let's hope nothing else is damaged too.

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Re: APOD: Mars Perseverance Sol 3 (2021 Feb 26)

Post by orin stepanek » Fri Feb 26, 2021 12:32 pm

PIA24264-1900.jpg
Picture being stretched out makes it difficult to identify! IMHO! :wink:
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Re: APOD: Mars Perseverance Sol 3 (2021 Feb 26)

Post by XgeoX » Fri Feb 26, 2021 1:24 pm

That looks like some pretty rough terrain to travel over.

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Re: APOD: Mars Perseverance Sol 3 (2021 Feb 26)

Post by bls0326 » Fri Feb 26, 2021 1:41 pm

The "Stitched together on planet Earth" brings up the panaramic (detailed) view. Quite spectacular once you get it into the full view.

https://mars.nasa.gov/resources/25640/m ... -panorama/

Eclectic Man: I think the "damage" you are seeing is not damage, but how the pictures are stitched together. There are several places where the stitching does not quite match up.

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Re: APOD: Mars Perseverance Sol 3 (2021 Feb 26)

Post by neufer » Fri Feb 26, 2021 4:57 pm

https://marsed.asu.edu/mep/craters/low-angle-impact-craters wrote:
<<Most impacts that make a crater make a round crater. This is because explosions expand in all directions equally. But when an incoming meteorite strikes the ground at a shallow angle — less than 15° above the local horizon — the resulting crater is no longer circular.


Low-angle impacts produce craters with an oval outline. And instead of a debris apron all around the crater, two "wings" of debris are flung to either side, making a butterfly pattern. (This is similar to what happens at double-impact craters.) On occasion, there is a smaller crater in line with the oval one and the wings; these may be caused by the impactor breaking apart just before hitting — or possibly the top of the impactor splits off and travels a little farther downrange before hitting.

Elliptical craters with butterfly ejecta patterns make up roughly 5% of all craters on Mars. Similar craters are also seen with about the same abundance on the Moon and Venus. While scientists have studied crater-making explosions in detail, their understanding of what happens in an oblique impact is much less certain. Lots of work needs to be done still to fully understand this process.>>
https://en.wikipedia.org/wiki/Jezero_(crater) wrote:
<<Jezero [Slavic for 'lake'] is a crater on Mars located at 18.38°N 77.58°E in the Syrtis Major quadrangle. The diameter of the crater is about 49.0 km. Thought to have once been flooded with water, the crater contains a fan-delta deposit rich in clays. The lake in the crater was present when valley networks were forming on Mars. Besides having a delta, the crater shows point bars and inverted channels. From a study of the delta and channels, it was concluded that the lake inside the crater probably formed during a period in which there was continual surface runoff.

In a March 2015 paper, researchers from Brown University described how an ancient Martian lake system existed in Jezero. The study advanced the idea that water filled the crater at least two separate times. There are two channels on the northern and western sides of the crater that probably supplied it with water; each of these channels has a delta-like deposit where sediment was carried by water and deposited in the lake. Craters of a given diameter are expected to have a certain depth; a depth less than expected means sediment entered the crater. Calculations suggest that the crater may hold about 1 kilometre of sediments. Most of the sediments may have been brought in by channels.

Since it is believed that the lake was long-lived, life may have developed in the crater; the delta may have required a period of one to ten million years to form. The Mars Reconnaissance Orbiter identified smectite clays. Clays form in the presence of water, so this area probably once held water and maybe life in ancient times. The surface in places is cracked into polygonal patterns; such shapes often form when clay dries out.>>
Art Neuendorffer

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Re: APOD: Mars Perseverance Sol 3 (2021 Feb 26)

Post by johnnydeep » Fri Feb 26, 2021 8:40 pm

APOD Robot wrote:
Fri Feb 26, 2021 5:09 am
Image Mars Perseverance Sol 3

Explanation: Stitched together on planet Earth, 142 separate images make up this 360 degree panorama from the floor of Jezero Crater on Mars. The high-resolution color images were taken by the Perseverance rover's zoomable Mastcam-Z during mission sol 3, also known as February 21, 2021. In the foreground of Mastcam-Z's view is the car-sized rover's deck. Broad light-colored patches in the martian soil just beyond it were scoured by descent stage rocket engines during the rover's dramatic arrival on February 18. The rim of 45 kilometer-wide Jezero Crater rises in the distance. In the coming sols, Perseverance will explore the ancient lake-delta system in the crater, hunting for signs of past microscopic life and collecting samples for potential future return to planet Earth.
So, can someone point me to the "annotated versions" mentioned at https://mars.nasa.gov/resources/25640/m ... -panorama/? I can't seem to find them.
Annotated versions of this panorama include a scale bar and close-ups of rock features seen in the distance. A detail shot from the top of the panorama shows the rim of Jezero Crater, Perseverance’s landing site.
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Re: APOD: Mars Perseverance Sol 3 (2021 Feb 26)

Post by johnnydeep » Fri Feb 26, 2021 9:20 pm

bls0326 wrote:
Fri Feb 26, 2021 1:41 pm
The "Stitched together on planet Earth" brings up the panaramic (detailed) view. Quite spectacular once you get it into the full view.

https://mars.nasa.gov/resources/25640/m ... -panorama/

Eclectic Man: I think the "damage" you are seeing is not damage, but how the pictures are stitched together. There are several places where the stitching does not quite match up.
You are right. Witness the broken and shifted horizontal box edge just below the main color calibration target sundial. That break lines up with the "missing" part of the gray-scale calibration target above it.
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Re: APOD: Mars Perseverance Sol 3 (2021 Feb 26)

Post by Eclectic Man » Sun Feb 28, 2021 11:07 am

bls0326 wrote:
Fri Feb 26, 2021 1:41 pm
The "Stitched together on planet Earth" brings up the panaramic (detailed) view. Quite spectacular once you get it into the full view.

https://mars.nasa.gov/resources/25640/m ... -panorama/

Eclectic Man: I think the "damage" you are seeing is not damage, but how the pictures are stitched together. There are several places where the stitching does not quite match up.
Phew! Thanks, I hadn't thought of that. That's a relief. Looking forward to the images of the first airborne drone on Mars coming up soon.