Crater Langrenus

Sketching: For this sketch I used: black Strathmore 400 Artagain paper, white and black Conte’ pastel pencils and a hard blending stump. Telescope: 10 inch f/ 5.7 Dobsonian with 6mm (241x) and 4 mm (362x) eyepieces Date: 8-8-2009 6:50-8:15 UT Temperature: 22°C (72°F) Partly cloudy, calm Seeing: Antoniadi III, Co longitude 107.3° Lunation 16 days Illumination 98.5% Libration in Longitude -3.5° Oak Forest, Illinois Frank McCabe