on the catwalk of the Harlan J. Smith 107-inch telescope dome. Brrrrrrrrrrr - it was c-c-c-c-c-c-o-l-d up there! We had eight more inches of snow overnight for a grand total of 15-inches. Pretty sure that's a record for McDonald Observatory but they are checking the weather archives to be...
The first chance to fire my BIG GUN since september was spent on the old faithfull Jupiter.
Some calculations: the diameter of Jovian disk on the image is 143,75+/-3,9 (SD) pixels and its apparent size was 46,68 arcseconds. That means that I have equivalent angular pixel size of 0,32...