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.

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.