Mars sketched by Michael T. Sheehan using a 6-inch f/5 reflector at 324x with a #25A red filter and a #58 green filter, October 10, 1988, from 9:10 to 9:40 CDT. The sketch is centered on Solis Lacus, at 130° CM.
David J. Eicher library
To learn more about astronomical sketching, Astronomy magazine subscribers can access my Astronomy.com video "Sketching from the telescope" and read Glenn Chaple's Observing Basics column "Sketching 101."
See the rest of the Sketching at the telescope series.