Mare Humorum

Sketching: Sketch was made over two observing sessions For this sketch I used: white sketching paper 10”x 8”, HB, 4B, 6B graphite pencils, a blending stump and a plastic eraser and eraser shield. After scanning, Brightness was decreased (-2) and contrast increased (+2) using Microsoft Office Picture Manager. Telescope: 10 inch f/ 5.7 Dobsonian and 6 mm eyepiece 241x Dates: 8-15-2009, 9:30-10:25 UT; 9-13-2009, 10:00-11:10 UT Temperature: 15° C (59° F), 16° C (61° F) clear, calm, then cloudy the first day, Very humid both days, dense fog on the second day Seeing: Antoniadi II-III Colongitude 205.5°, 200.2° Lunation 24.27 days, 24 days Illumination 32.7 %, 35.3 % Frank McCabe