With “Space Day” coming up next week @UWO, I figured it’d be a good idea to jot down what I’ve noted about fresh crater impact melts on Mercury in preparation for that fateful day.
As if I didn’t already have enough to do…!
Here’s what I’ve got so far:
>>15 named craters + 9 unnamed craters = 24 craters in total. Up to 6 other, less-promising candidates….
>>Smallest crater w/ exterior melt = Ailey crater with a diameter of 23 km; Ailey appears to be on the transition from simple to complex crater form.
>>6 craters, most of them >100 km in diameter, have more than 1 unique pooling of impact melt. Most have 2, but a couple, like Hokusai, have 3 or more.
>>6 craters are found adjacent to older craters, and as such their collection of melt is almost exclusively found within that older crater. For this group, for some reason the older crater tends to be located just to the north of the fresher crater.
>>For the remaining craters, the majority of the smaller complex craters, have only 1 collection of melt present.
To recap, here’s what Neish et al. (2016) & Neish et al. (2014) have found for Venus & the Moon, respectively:
>Venus — 19% coincide, 31% up to 45*, 17% up to 90*, and 33% >90*.
>Moon — 53% coincide, 27% up to 45*, 7% up to 90*, and 13% >90*.
That’s all I got at the moment! The next step now is to locate the rim-crest low for each crater, and for that I’ll need to figure out the topography dataset…. I’ll also stress that my work so far is preliminary and I still have a fair number of things to do yet that hopefully will confirm these initial findings of mine.
The results look promising already, though. More to come in due time!
[the images are screencaps from: https://messenger-act.actgate.com/msgr_public_released/react_quickmap.html]