I was well into the sketch when I noticed my first mistake. I was using the excellent black Canson acid-free paper and one edge was embossed with the words â€œColorline Cansonâ€¦â€ which I discovered about one hour into the sketch as I began drawing over these wordsâ€¦ Dah.
The terminator was cutting across the western part of the peninsula which was diagonal and inverted in the eyepiece from upper right to lower left in the Newtonian telescope.
From top center to lower left the large ancient craters with floors in full darkness are: Regiomontanus (125km.) with an illuminated, cratered peak somewhat off center; Purbach (120km.) with its arching central peaks picking up the last rays of sunlight; Smaller Thebit (60km.) closest to Rupes Recta (Straight Wall); Arzachel (100km.) with all but the rim in total darkness (note: that was not the case before I started sketching); and lastly Alpetragius( 40km.) with the tip of its huge central peak catching light.
The two smallish and younger craters on the other side of Rupes Recta are Birt (17km.) and Nicollet (15km.). With such good seeing many smaller craters were clearly visible across the Sea of Clouds. While observing this region after finishing the sketch in twilight, clouds moved in and closed out any further viewing.
Sketching is always a series of compromises, if you want the moon high in the sky this time of year you are limited to the early morning. During the fall early morning is the coldest part of the day and you need to give up some sleep time.
It was an adrenalin rush to see the moon on this morning and enough to keep warm.
For this sketch I used: black Canson paper 9â€x 13â€, white and black Conteâ€™
pastel pencils , and Conteâ€™ crayons, a blending stump, plastic eraser.
Telescope: 10 inch f/ 5.7 Dobsonian with 6mm (241x) eyepiece
Date: 10-11-2009 9:30-11:30 UT
Temperature: -3Â°C (27Â°F)
Clear becoming mostly cloudy, calm
Seeing: Antoniadi II and briefly I
Co longitude 182Â°
Lunation 22.7 days
Oak Forest, Illinois