Have you seen Rima Brayley? What size and type of telescope were you using? How small a telescope do you think could see (resolve) Rima Brayley?
July 4, 1998: What I saw looked like a very thin dark line, not really straight, but not the same meanders shown in Rukl's atlas.
The next night, Sunday, July 7th shortly after the sky got reasonably dark I caught glimpses of what I think was Rima Brayley near Brayley. It was a thin bright line that had similar meanders and a little more of the the rima a little farther north. The views were brief and I hope I wasn't accidentally playing connect the dots very small bright spots. It is one of those things that seemed very real briefly but as the night and the terminator moved on I couldn't see the Rima Brayley meander so it makes me want to question my observation.
The rima near "the rock", an elongated pile of rocks at about 35 deg w. and 21 deg n. This short rima runs next to "the rock" and on the opposite side of crater Brayley as rima Brayley. This rima was a very thin bright meander. I saw it enough times Sunday evening that I feel good about this observation.
In brief intervals of excellent seeing, I could distinguish the part of the rille immediately due north of Brayley, at 285x (4 mm Vixen Lanthanum LV eyepiece). The rille appeared as a very fine dark line. The sunrise terminator was 30 or 40 Km west of Brayley at the time of the observation.
When the seeing steadied, I saw a short, slightly curving line segment, less than one Brayley-diameter in length, located a bit north of Brayley, positioned and oriented as is Rima Brayley on the Rukl charts. I saw it only two or three times, for a few seconds at a time, in perhaps fifteen minutes of looking through my Meade at that specific area. During a much briefer glance through Rich's AP, I saw the same thing once or twice. The line was narrow and dark, showing no perceptible width, and no variation in intensity along the section that I could see. It was faint and insignificant enough that I probably would not have noticed it if I had not known exactly where to look.
Using my 5-inch, I looked for Rima Brayley at several other places along its length, by reference to some of the hummocks and ridges that it passes, but could find no trace of it anywhere else.
The wrinkle ridge system that is tangent to Brayley on the (selenographic) SW side, that trends SE/NW, was prominent, as was much other detail in the area.
I also looked for a rille plotted but not named by Rukl, that lies at about 21 N, 35 W. I could not see it, although a white albedo feature near that location was prominent. The feature lies a few Km SE of an unnamed peak at about 21.3 N, 35.5 W, and as near as Rukl's atlas allows me to judge, is superimposed on the unnamed rille at that location.
|Moon-Lite Atlas for chart 19|