Hitchhiker's Guide to Rukl Chart 40

Letronne (...Akkana)
The horseshoe of Letronne is shaped like a mini-Iridum, facing the smaller horseshoe of Wichmann R (chart 41).
Flamsteed (...Akkana)
Flamsteed P, the large flooded crater bordering the much smaller Flamsteed, was the landing site for Surveyor 1.
Hansteen and Billy (David North <d _at_ timocharis.com>)
A good set of landmarks in the Mare Humorum are -- and an interesting sight in themselve -- are the Castor and Pollux of the moon: Hansteen and Billy. They are just to the north and west of the Mare Of Rilles, and are almost exactly the same size, right next to each other. But Billy is filled in flat with dark mare material, where Hansteen shows as an old crater with a fractured floor and complex central peaks. It's interesting to speculate how two such craters, quite probably of similar age, should look so different while so proximal. Just a little bit of distance across the great Oceanus Procellarum made all the difference in their appearances today.

They are a very good jumping off place for spotting the end of Rima Sirsalis, as well as a pair of pointers toward the rich Rimae Grimaldi complex. Billy's dark floor makes it obvious even when the sun angle is high, and nearby Hansteen makes confirmation of location and direction very easy.

Moon-Lite Atlas for chart 40

This page last modified: Dec 06, 2020
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