#MarsWalk day 15, 72.0 km

[Edit: Using the revised stride length measured on 7 Feb 2016, distance was 80.2 km.]

Seven more days, 72 km along. Into Evpatoriya and out again last weekend. Right now there’s nothing with a name (that I know of) particularly close by.

But there’s a HiRISE picture. HiRISE is the High Resolution Imaging Science Experiment on the Mars Reconnaissance Orbiter, MRO. On 4 Aug 2010 it took a picture of a piece of terrain about 27 km to my west and a little north. The web page says “Candidate New Impact Site Formed between May 2010 and July 2010” and unfortunately there seems to be no further explanation than that. But this picture is one of a few dozen mentioned in this paper. It would seem this region was earlier photographed twice by another MRO camera, the Context Camera (CTX, which covers larger areas at lower resolution than HiRISE), once in May 2010 and once in July 2010. Here’s a detail of the first of these:B21_017654_2279_XI_47N226W_detand here’s the second:G01_018577_2279_XI_47N226W_det

Spot the difference? Yes. Spot. The difference. Something impacted Mars between May and July. It left a mark. Presumably that was why the next month HiRISE was commanded to take a higher resolution picture; here’s a detail of that.ESP_018854_2270_RED.abrowse_detAnd here it is zoomed in to full resolution:
ESP_018854_2270_RED_detLooks like a sharp crater or two a little above the center, is that the new one(s)? And I presume the dark stuff is ejecta from below the surface which lightens as it weathers.

I don’t think there are any other HiRISE images of the same location but there are later CTX images. You can see the spot fade.

23 Nov 2010:G05_020278_2282_XI_48N226W_det 17 Mar 2012:G21_026436_2279_XI_47N226W_det23 Aug 2013:
D15_033161_2280_XN_48N226W_det 16 Feb 2014:D21_035429_2279_XI_47N226W_det 7 Sep 2014:F06_038040_2279_XI_47N226W_det

Barely visible there, but it seems we have a new crater. (Or, going back to that paper again, a few dozen. That we’ve seen.)

MarsWalk spreadsheet

MarsWalk kmz file (for Google Earth — View >> Explore >> Mars)


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