Sunrise over Encke and Maestlin R

One evening last week, while inspecting the terminator, I came across the Encke crater. The illumination was favorable and I decided to give it at go at the sketching pad. Starting out my eyes were soon drawn to a spiky pattern closer to the terminator. I have recently bought a copy of Harold Hill’s wonderful A Portfolio of Lunar Drawings, and I immediately recognized the spikes from one of his drawings  (p. 70-71). I decide to extend the range of the sketch and to try to render both Encke and the shadows cast by the remnants of Maestlin R.

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Sketched on 23 October 2015, UT 17:45, using a SkyWatcher 10″ and a TeleVue Nagler 3-6 zoom eyepiece. Seeing 4-5 and with some interference from light clouds. South is up.

Maestlin R draws it’s name from Maestlin, a small and rather unassuming crater just to the north of it (bottom right in sketch). The spikes are created by a series of peaks in the degraded crater wall and cast on the smooth mare. At the time of the sketch the western wall of Maestlin R shone brilliant white, creating a striking contrast.

Encke is a rather large, polygonal and floor-fractured crater. Several ridges were seen on the floor, most notably a ridge traversing the floor from north to south.

Mike Wirth have imaged the area under similar illumination. The image can be found on LPOD.

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