Crater Humboldt

Sketching: For this sketch I used: black Strathmore 400 Artagain paper, 9”x 9”, white and black Conte’pastel pencils and a blending stump. Brightness was slightly decreased after scanning. Telescope: 10 inch f/5.7 Dobsonian and 6mm eyepiece 241x Date: 11-25-2007 5:30-7:00 UT Temperature: -3°C (27°F) ice fog, calm Seeing: Antoniadi III Co longitude: 95.9° Lunation: 15.3 days Illumination: 99.4 % Frank McCabe