SpecialSetOfSieves

joined 11 months ago
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[–] SpecialSetOfSieves 8 points 11 hours ago

This is one of the best dust devil videos ever captured, IMO. Spirit used to catch whole packs of them roaming the great prairie-like floor of Gusev Crater (back when that rover was perched up in the Columbia Hills, I believe), but this devil in the foreground here shows a lot of detail, and is quite close to the camera, unlike those in old shots from Spirit. From what I recall, Percy has been able to capture some nearby dust devils in similar detail, which is unsurprising given that the Jezero region is supposed to be the windiest site we've visited on Mars... but awesome nonetheless.

Just looking at the shadows it casts is very revealing, and watching the thick white patches of the vortex really gives you an idea of the turbulence involved here. It's really cool that we can see the entire length of the shadows being cast; I wonder if this is one reason why these shots were taken near noon, rather than later in the afternoon, around the time of maximum daily heating.

For scale, the crater at the bottom left is 300 m across from left to right, so you can tell that the "foot" of the foreground devil is quite a bit bigger than Percy itself. So much to see here!

[–] SpecialSetOfSieves 3 points 12 hours ago (1 children)

Pssst... this is the Curiosity instance!

[–] SpecialSetOfSieves 2 points 1 day ago

Hahaha I hear you, Paul. In the end, I'm just going to have to bite the bullet and learn how to work with images myself. I didn't mean to put everything off onto you 😄

As for people not appreciating the images, or the general stream of information from the rover(s), I'm proceeding on the theory that it's hard to appreciate what these missions do without the context being readily available. Even in sifting through aaaall the images I needed to assemble my overview of the abrasion patches, I could see that I needed to rapidly compare and contrast several different abrasion sites to get a quick visual feel for the differences between them. And if someone like me feels this way, I can only imagine how difficult it might be for the casual social media user to see how exciting "another red rock" might be. Geologists aren't always the best at outreach, but I believe the attempt is worth it in my case.

I can't help with the 3D images just yet, but I'll see what I can do after I post my overview.

[–] SpecialSetOfSieves 2 points 1 day ago (2 children)

Thank you! I've seen some of these before when looking at 3D models of the abrasion patches, but those shape models are quite useful in general.

I was thinking specifically of the "anaglyph" images we used to get from the MER PanCams and NavCams (such as the "Legacy Pan" from Opportunity). Even individual 3D frames could be quite mind-blowing in demonstrating the true ruggedness of those landscapes. The environments in and around Jezero, let alone Mt. Sharp, can't be any less rugged than those were.

[–] SpecialSetOfSieves 4 points 2 days ago (1 children)

In other news, it does seem that the skies are finally clearing up a bit, now that we're well into spring. This shot, from the mid-afternoon on sol 1359, shows how heavily obscured the distant hills on the western horizon were relative to the 1397 shot taken at nearly the same hour, and included above in Paul's mosaic.

[–] SpecialSetOfSieves 5 points 3 days ago (4 children)

As Paul Hammond mentions, the "melting" is due to material sliding downhill. During the abrasion, which works partly by percussion, you can actually see a pebble sliding downhill (between this frame and this frame, which were taken only one minute apart), to the bottom right of the abrasion bit itself (near the centre of the image).

It's not always apparent from the images, but the rover is currently on a fairly steep slope; we're still parked on the exterior/outboard side of the Jezero Crater rim. I wonder how difficult it would be to make the 3D images I used to see from earlier rover missions...

[–] SpecialSetOfSieves 3 points 4 days ago (1 children)

Younger (stupider) me thought that geotechnical engineering was boring and tedious, but as time goes on, and I see how much trouble it is to drill and collect samples from places like Mars, Luna, or the asteroids, I admit I'm changing my mind here. Between InSight's troubles with the mole burrowing into that clumpy regolith in Elysium and the crumbly stuff Percy has to deal with, I'm realizing that we need some bright people to address these unexpected material properties with good hardware. I'll add "sampling engineers" to the list of unsung heroes I'd love to hear more from, like the people behind Ingenuity!

[–] SpecialSetOfSieves 2 points 4 days ago (3 children)

LOL And here I was lamenting the lack of new activity just hours ago...

They've been abrading a lot more holes lately - this is the fourth since Percy reached Pico Turquino only ~2 months ago, comparable to the rate at which we were working on the delta fan. Good times ahead!

[–] SpecialSetOfSieves 6 points 4 days ago

In the last 48 h the JPL website has had trouble serving up the raw images page, which is pretty frustrating when you're working on any projects associated with this mission. Percy has already seen and done a lot in ~4 Earth years, so there is one hell of a lot to review if you're trying to be thorough...

 

Just making a thread for anyone who wants to commiserate about the lack of new images from Percy of late. Mods, feel free to delete if this doesn't belong here.

We shouldn't ever forget that many many JPL employees have lost their homes, which is more than just a "bummer". They might be launching their stuff into space, but the work of people at the lab is appreciated and its absence is felt in people's daily lives too.

[–] SpecialSetOfSieves 3 points 1 week ago* (last edited 1 week ago) (3 children)

As of about 17:00 UT today (15 January), there are new images on the server, but they were all taken more than a week ago.

I hope all the JPL folk are OK!

[–] SpecialSetOfSieves 3 points 1 week ago (1 children)

Mmmmmmmmm 🍽

Massive dust-free jointed angular boulder faces, served on a bed of saltating basaltic grains, with light-toned speckles and a light purple Jezero-style coating, delicately applied.

Carbon-restricted dining at its finest. 3/5 stars.

 

The fires that spread destruction across the Los Angeles region this week and killed at least 11 people have spared two famed scientific facilities: NASA’s Jet Propulsion Laboratory, which has spearheaded planetary missions and astronomy efforts, and the historic Mount Wilson Observatory. While the Eaton blaze that has destroyed nearly 14,000 acres and 7000 buildings in Altadena and Pasadena stayed an appreciable distance away from JPL, flames from that fire continued to climb towards Mount Wilson until eventually stopping at the edge of the observatory’s grounds on 9 January.

“Thanks to the efforts of our firefighters and observatory staff, no buildings or infrastructure have been destroyed” at these facilities, said Anthony Marrone, the LA county fire chief, in a press briefing this afternoon. Still, JPL director Laura Leshin said on X that more than 150 of her staff have lost their homes to fire. And some Mount Wilson employee have evacuated and don’t know when they can return. “For us, the story is about our employees, and not about the facility” says Veronica McGregor, a spokesperson for JPL.

In preparation for the Eaton fire, one of six scattered across Los Angeles, JPL moved operations of its Deep Space Network, an international network that commands and communicates with space-based missions, to a back-up operations center and instructed all employees to work from home.

 

The fires that spread destruction across the Los Angeles region this week and killed at least 11 people have spared two famed scientific facilities: NASA’s Jet Propulsion Laboratory, which has spearheaded planetary missions and astronomy efforts, and the historic Mount Wilson Observatory. While the Eaton blaze that has destroyed nearly 14,000 acres and 7000 buildings in Altadena and Pasadena stayed an appreciable distance away from JPL, flames from that fire continued to climb towards Mount Wilson until eventually stopping at the edge of the observatory’s grounds on 9 January.

“Thanks to the efforts of our firefighters and observatory staff, no buildings or infrastructure have been destroyed” at these facilities, said Anthony Marrone, the LA county fire chief, in a press briefing this afternoon. Still, JPL director Laura Leshin said on X that more than 150 of her staff have lost their homes to fire. And some Mount Wilson employee have evacuated and don’t know when they can return. “For us, the story is about our employees, and not about the facility” says Veronica McGregor, a spokesperson for JPL.

In preparation for the Eaton fire, one of six scattered across Los Angeles, JPL moved operations of its Deep Space Network, an international network that commands and communicates with space-based missions, to a back-up operations center and instructed all employees to work from home.

[–] SpecialSetOfSieves 3 points 2 weeks ago (1 children)

Based on yesterday's images, they're thinking of drilling again, but we've moved 30 m downhill since! I guess Percy was being an impatient horsey again (and to be fair, we hadn't moved in over a week anyway).

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SSS Test (self.specialsetofsieves)
 

Original MastCam-Z image

Now serving:

  • some hefty, rounded-off dark chunks, enough to embarrass even the most hardcore chocolate-chip lover
  • a small helping of greasy, streaky, shinier light-toned bits interspersed, for flavor
  • all set into that classic cream-colored background we've come to know and love, and available in a nice, flat boulder-sized outcrop, probably within reach of the rover's instrument arm.

After a long hike, this is the perfect spot for a picnic.

 

We are actually there. Nili Planum. The outer edge of Syrtis Major, that dark "peninsula" one sees even through backyard telescopes, a big part of all those studies that people like Percival Lowell or Schiaparelli did, when the dreamer types were still looking for vegetation and canals. We've never known anything like this on Mars, even after decades of rovers exploring the planet.

It might be nice if we could actually see it!

We are now weeks into the springtime, but this muddy winter gloom just goes on and on and on. And there is so much to see here!

 

Don't try to tell me that there isn't at least one skier, boarder or sledder among the rover drivers.

Bonus points for the white powder they made with the abrasion tool (left of center, where the tracks meet the rocks). Pico Turquino may not be good enough for certain geologists, but some people know how to have fun on powder that no one has carved in 3 billion years.

 

This episode would be a good one for introducing all those non-Martians in your life to Percy's journey, with the combination of sweeping visuals and the callback to Ingenuity's fledgling flights. Especially if you want to spend more time in the tropics.

 

... because the overhangs, and all the holes among these many boulders, would make me nervous if I was roving the slopes of this giant crater rim. We know that Percy is a very determined astro-droid, but there are too many places for tech scavengers to hide around here. Although I guess they would have to be pretty small jawas...

Link to full Mastcam-Z frame

 

All of the above vignettes were cropped from Front Hazcam images taken on Sol 1308, at about 1 PM local time.

Given that the sun was roughly behind the camera and rover when these images were captured, the complex, light-toned surfaces of these rocks stands out, with glinting reflective patches evident, especially toward the top of the hill. I'd be intrigued to view these rocks in the late afternoon, when shadows are longer and the dusty skies of late winter aren't layering that soft sheen over everything. Given the aggressive driving schedule that the rover team has adopted for climbing the Jezero rim, though, I'm not sure that Percy will stop here for very long...

 

This shot was taken by the arm-mounted WATSON camera at 10:46 PM local time, illuminated by the LED (see also shots lit from the left and right, for perspective). The boulder Percy is analyzing (see here for a daylight view) isn't as reflective as some near the rover, but then again, this part of the Jezero rim seems to have more than enough funky rock coatings for anyone!

 

I can't find any evidence that the triangular-prismatic rock at the top centre of this image even existed before Sol 1292 (apparently visible on the left hump on the horizon in this image)... are the Martians watching us???

(To be clear, I am joking here. I just think it's really neat to see how many of these cobble and boulder-studded slopes on the Jezero rim produce these angular and seemingly resistant forms. Martian hills and mountains are pretty rounded in general - I'd hardly expect to find the Matterhorn in these ancient landscapes - but erosion has a way of surprising you in this place...

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