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Cake day: February 3rd, 2024

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  • As of this latest drive, Perseverance has left the area which was originally mapped in detail for this mission (I have highlighted the quadrangles visited by Percy in red below):

    The rover is now south of “Forlandet”, one of the highlighted quadrangles at the far left of the map. (We landed in “Canyon de Chelly”, at right-centre, on the crater floor).

    Obviously, there has been further geologic mapping of the terrain along Percy’s intended path - no surface mission has ever “roved blind”, even from the days of Apollo - but, to my knowledge, the mission has not shared any of the newer maps in a format accessible to a general audience (there have been a couple of publications in the last year or so, but these are strictly for geologists and not easily digestible). In particular, I cannot find any new information on the quadrangles that we are now roving or soon due to visit - not even their names.

    How about it, NASA? JPL? We are aware of the savagery of the funding cuts under the current administration, and their effects on the actual people who make these missions happen. This comment is by no means intended as a complaint, but an acknowledgment of the importance of what you do - this whole community and the broadly positive attitude toward these missions that we readily see online is proof. Especially given that there are no new science missions, like sample return or future rovers, on the books…
















  • This is the longest drive Percy has made in a while (about 100 sols) and one of the longest of 2025, as we transition toward the next area of investigation. I anticipate another long drive in the next sol or two, as the current location is rather windswept and target-poor, and the nominal plan has Percy moving toward some new outcrops to the south.

    The Vernodden slope we just departed (see the map above) was investigated extensively, but we only made one sampling attempt there, which was unsuccessful. The science team is being extremely selective with sampling operations now, given that we only have 8 sample tubes remaining, so any future sampling attempts will indicate a very high science value. The map below shows the nominal future path that the mission laid out about a year ago (which I’ve updated with some landmarks - current location marked with a cross):

    The whole traverse from the rim summit to Vernodden - hardly a huge expanse - has taken 320 sols, so Percy has a long way to go before reaching Singing Canyon!




  • I want to see astronauts on Mars as much as anyone. That being said, I think we can all see that remotely operated rovers have their place, and they will even after humans visit. It’s a big planet, after all. And they’ve taught us so much by “living” on Mars for years and years, which the first humans to touch down won’t do. And that’s before you consider how important Percy’s samples are. Beyond all that, though, it’s easy to see from images like this why we’re so attached to our rovers:

    I wonder if the people who want to defund these missions realize that they’re personally less popular and lovable than these robots…









  • Everyone in this thread is approaching the question from the perspective of the passive resident role, and not the traveling science minstrel role.

    Given that I am definitely more inclined toward the latter - which apparently makes me a tiny minority, even in this thread - I feel confident saying that I would have far more to fear from all of you than the reverse.

    You may all point and laugh now.


  • knock, knock

    I’m not a serial killer or a vampire, and I will happily discuss Venus with you. We can even do it at a nice, safe distance! I’ll apologize now if that doesn’t advance your fiction, or any erotic fantasies of frustrated vampires you may have.

    I really want to build a set-up that can properly observe the planet deep into twilight. I’ve read that twilight is the time when you can observe the almost-legendary “ashen light”. Given recent discoveries around a very narrow atmospheric window that lets you just sort of see the surface, in a super-blurry way, I’m wondering if these two phenomena are related. Given the Trump antipathy to planetary science, and Venus exploration in particular, I would find this pretty satisfying.

    … unless you were referring to Aphrodite, and not the planet.


  • Fast forward to 2025, and we take it for granted that we’re roving Mars, covering the kind of scientifically compelling terrain that Carl could only dream about.

    (My emphasis added)

    I certainly hope that’s not true, because Mars exploration - by the US - is under serious threat.

    Now after five rovers and a helicopter, there’s no current plan for any more.

    This does ignore the European plan to launch the full-sized ExoMars “Rosalind Franklin” rover in 2028, but I can’t disagree with Mars Guy too loudly here. Aside from the small but neat EscaPADE mission that NASA plans to launch soon (two orbiters, no lander, no rover), planned science missions to the surface are non-existent for years to come.

    Unless China does their sample return mission later this decade, that is…





  • Quick impressions/interpretations (you may need to zoom in on this image):

    A - Dark grey pebble: not the first time we’ve seen something like this - a grey pebble embedded in the rock like a chocolate chip in cake batter - but always worth pointing out. Most residents of Earth wouldn’t pay the least attention to this sort of pebble, but you don’t see them on Mars so much, right? This rock fragment appears to be solidly intact and mostly unaltered.

    B and C - Small light grey fragments: these ones are very flattened compared to A (likely softer material than fragment A), but don’t display many “spots” of different colour.

    D - Small light grey fragment with spots: Compared to A, B and C, there are more “blemishes”, if you will - white flecks and a darker grey spot.

    E - Whitish zone: Perhaps something that originally resembled D, now further altered?


    The above interpretation presumes that all of the little fragments originally resembled A, which is not a safe assumption, but clearly these little pieces have seen some things and have a story to tell.

    Whitish material has often proven to be a soft sulfate mineral, like gypsum, which is a sign of significant alteration by water, after the rock was originally laid down. We’ve seen signs of aqueous activity not far from here, so I wouldn’t be surprised if this is again the case.

    One striking thing about all of the fragments in this rock is how rounded they are. Impact breccia (from the asteroid strike that made Jezero Crater) often shows fragments with sharp, angular edges (here’s one example from Earth, or this one, from Luna), thrown out and mixed in by the impact itself. Here, though, it’s hard to find any sharp corners in the embedded fragments. Fun times!







  • Sunrise on sol 1639 was circa 05:20 LMST. I note that Percy was active before sunrise on 1638 as well, with some PIXL imaging of abrasion patch #46. We’ve seen early morning imaging activity in other recent sols as well, so - perhaps we should not be entirely surprised? I do share your puzzlement, however, Paul.

    There was a full suite of multispectral imaging on this interesting clast back on 1626, albeit at noontime, and the very same light-toned close-up target was viewed by SuperCam RMI on that sol as well. Given the fairly rapid pace of operations in this Vernodden region, with the rover making abrasions at a steady pace, then moving on, I don’t find it surprising in retrospect that we would do follow-up imaging on a target like this, now that we’ve doubled back to patch #46.