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Jupiter, the GRS and Io's Shadow

Jupiter, the GRS and Io

Sketching: 8/19/2009, 3:15 - 4:00 UT Telescope 10" f/5.7: 6mm ortho. (241 x) Sketch made on 9"x 12" sketching paper with 2B, 4B and HB graphite pencils, plastic and gum erasers, blending stumps. Contrast increased +2 and brightness decreased -2 using the scanner Seeing 6/10 Transparency 3/5 Mostly clear, 20°C (68°F) Frank McCabe

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