Bullialdus Crater
Eratosthenian period crater Bullialdus (63 km.) was just a few hours past full rim illumination and was not yet taking light on its central peaks but the western terraced wall was well illuminated by morning sunlight. The darkness over the floor of this caldera gives a sense of greater depth than the true drop of 3.5 kilometers.At the time of this observation ridges and furrows were clearly seen on the craters outer ramparts. Also included in this sketch are craters Bullialdus A and B at 10 o’clock and Konig at 12 o’clock. South is up in the sketch and East is to the right.
Sketching
Telescope: 10 inch f/ 5.7 Dobsonian and 6 mm eyepiece 241 x
Date: 7-21-2010, 1:00-2:30 UT
Temperature: 22° C (72° F)
clear, calm
Seeing: Antoniadi III
Colongitude: 26.3 °
Lunation: 9.25 days
Illumination: 77.1%
Frank McCabe
Frank
A real vivid and highly skilled piece of art.
Scott.
Scott,
Thank you.
Frank
As always Frank I love your work. The texture, the colour, the shading… None better!