I would like to announce our "sister" Lemmy Community About Curiosity who is roaming Gale Crater since 2012. ![email protected]

On August 12, the Moon passed in front of the Sun, producing a total eclipse along a narrow path in the northern hemisphere of Earth. On Mars, in a cosmic coincidence a day later, Perseverance watched a tiny potato-shaped moon pass in front of the same Sun.

YT video

August 13, 2026 - Sol 1948: Left Mastcam-Z Camera

Perseverance used its SHERLOC WATSON camera on sol 1949 to take a close-up image of this light toned rock. The camera is mounted on the rover's robotic arm. Check the comments for a much closer image at the rock from the same camera acquired on the same sol

I see these images almost every day. What are they? Is that the sun and are they recording or sampling atmospheric conditions? In the past they were preceded by four images of star fields (if you download and zoom in.) What are those? (Image in comments). Are they related? Credit: NASA/JPL

Since the earliest weeks of the mission, the science team has been documenting an interesting type of feature found on many of the rocks Perseverance has encountered, dubbed the "purple coating". This has often been found on rocks that have been abraded by the rover (e.g. abrasion patches #2, left, and #18, right)...

... as well as natural, untouched surfaces. Some of these feature truly bizzare patterns:

The terrain being explored by Perseverance in Jezero Crater and Nili Planum is unique to date in our explorations of Mars, in that these coatings seem to be very widespread here. A much smaller number of rock coatings which may or may not be similar were found by Spirit and Opportunity, but Curiosity has notably found none. A 2025 paper by Garczynski et al. offers an explanation for these coatings - "indurated dust".

This "indurated" (solidified) coating forms may form in a series of steps:

• Windblown dust and very fine soil particles settle onto a rock
• Electrostatic charges may make the dust "clump" and stabilize on the rock surface
• Sand buries the stabilized dust
• Humidity beneath the sand increases under certain scenarios (e.g. frost formation events)
• The water reacts with iron and sulfur-bearing minerals in the deposited dust and soil, "cementing" it into a thin coating

This recent image captured by MastCam-Z shows a material very reminiscent of the purple coating on the rover's deck, near the base of the mast. If this material is related to the purple coating, it may have formed fairly recently. To my mind, the flat and homogeneous appearance of the material resembles the kind of thin layer you'd expect would form first.

Perseverance was parked for 46 sols (Earth dates 11 December 2025 to 28 January 2026) during solar conjunction, when the Sun prevented communication between Earth and Mars. Crucially, these dates correspond to late summer and early autumn in this region, when humidity is known to be high (as the longer, warmer days evaporate the north polar ice cap). Given the amount of fine regolith and dust that the wind has deposited onto the rover deck, and the relatively gentle slopes of the terrain we've been exploring in the last few months, it is conceivable that the loose material simply hasn't moved much recently, thus "sheltering" the deck, the same way sand can shelter the rocks where the coating has formed.

If correct, this observation of a coating on the body of Perseverance has interesting implications. It would mean that the coating can form quite quickly, and that this process is occurring today, not millions of years ago. Water actively altering the surface of Mars (and our rover) today is something we must observe closely, for many exciting reasons. If this process is active on an exposed and seemingly unsuitable surface like the rover deck, one wonders how widespread it is in the soil...

A ventifact is a wind carved rock

Mars Perseverance rover acquired this image using its Right Mastcam-Z camera set at full zoom (110mm).

Mastcam-Z is a pair of cameras located high on the rover's mast.

This image was acquired on July 22, 2026 (Sol 1927)

I'll add the drive data when JPL release the official info, but it looks like a drive of 5-6 meters East-northeast. These post-drive images were acquired on July 22, 2026.

So little of Mars has been explored by rovers that every new vista and every new rock they see could become a major discovery. So why has Perseverance now driven hundreds of meters back to the same spot it stopped at a month ago?

Episode 275

The difficulty in recognizing the size of features in images from Mars was my inspiration for including recognizable objects in these images, including an astronaut. Here I’ll reveal my DIY techniques for how they’re fit into Martian landscapes.

A rough estimate (red dot) of the new location. If correct the rover is enjoying a walkabout

More details in the comments

Assembled from 3 overlapping images from the SHERLOC WATSON camera.

Tiled L-NavCam