Give it a shot!
(One night later) One area I noted on the 27th, and wanted to return to last night, was east of the crater-chain Rheita E. 2 nights ago a large, approximately circular shadow resided there, definitely not cast be Rheita E but by what appeared to be a curved, gently rounded ridge that is somewhat visible in Rukl running near 48 E. Under higher illumination this seems clearly to be the remains of a large, greatly eroded crater, of which nearly all the rims have been leveled and only the contours of the bowl remain. I estimate the diameter at approximately 100 km, centered about 45 E, 32.5 S; it is not named or even apparent (except for the remnant of the eastern rim) on Rukl's chart. Reichenbach M and Z sit on its floor, and Neander H is on what would have been the western rim. Not a very dramatic feature, but with a form more clearly visible than any circular shape I can see to Brenner.
I spent most of the session on Brenner, as several ridges or valleys were visible that are not named on the charts - and I find the "discovery" of objects like this especially enjoyable. The most prominent of these, while unnamed, shows well on Rukl 68 as a ridge running approximately parallel to the lunar axis (from our perspective), from about 37 E, 33 S to 42 E, 41 S, the southern terminus being at the joined rims of Metius and Fabricius. Barely apparent on the map is another ridge quite visible under last night's illumination, even through the poor seeing; this runs again from the western junction of Metius and Fabricius in a W by NW direction to end at about 35.5 E, 40.5 S, to the NE of Brenner F. The third line of shadow, of which I see no evidence on the map at all, begins near 39 E, 35 S and runs past the SE wall of Stiborius A, ending near 36 E, 39 S.
These three markings together just fail to enclose a neat triangle, the only gap being S of Stiborius A. They were all quite easily visible in the 6" even through last night's average seeing, and show fairly well in a published photograph I have of the region (not in Rukl, unfortunately).
Also the region just east of Neander was right on the terminator. It made it look like a HUGE valley just east of Neander. Is that part of Vallis Rheita?
BTW, the way Janssen is marked on Rukl 68 is very confusing. It makes it looks like Janssen is only half its real size. The labeling on page 67 is much better.
|Chart 67||Moon-Lite Atlas for chart 68||Chart 69|