One of the many large and interesting craters on the visible lunar surface is this 230 km. diameter walled plain crater known as Schickard. This Pre-Nectarian crater is somewhat isolated from craters of equal size. It is the large, shallow floor of Schickard that presents its most interesting features and at the time of this sketch light was just beginning to spread across its floor. Tens of millions of years after this crater formed a much larger impact formed the Orientale basin, blanketing the crater with highland ejecta. This great crater can easily be seen in a modest telescope with good lighting one or two days before full moon.
For this sketch I used: Black Canson sketching paper, 14”x 12”, White and black Conte' pencils, a blending stump, plastic eraser. After scanning, contrast was increased (+1) using the scanner.
Telescope: 13.1 inch f/5.9 Dobsonian and 9mm eyepiece 218x
Date: 2-26-2010, 1:45 – 2:30 UT
Temperature: -6° C (21° F)
Seeing: Antoniadi III
Lunation: 11.98 days
Illumination: 90.4 %
Observing Location: +41°37' +87° 47'
Oak Forest, Il.