Sketch of Ptolemaeus and Surroundings
Move mouse over sketch to see labels. Click image for larger version.
Despite the bad seeing, Ptolemaeus and friends were large and stark enough to put on a good show at 120X. An interesting pillar of shadow within Ptolemaeus seemed bulbous at its tip. It seems likely that this little feature is caused by crater Ammonius. Spörer was a fairly rugged crater compared to deep Herschel. Lunar curvature was beautifully obvious across Ptolemaeus’ expansive floor.
|Subject||Ptolemaeus and Surroundings|
|Phase/Age||8.1 Days / 57% Illuminated|
|Size*||Ptolemaeus: 153 km dia x 2400 m depth
Ammonius: 9 km dia x 1850 m depth
Herschel: 41 km dia x 3770 m depth
Spörer: 28 km dia x 310 m depth
Gylden: 47 km dia
|Date/Time||AUG 27, 2009, 10:00 PM MST (AUG 28, 2009, 05:00 UT)|
|Observing Loc.||Flagstaff, AZ – Home|
|Instrument||Orion SkyQuest XT8 (203 mm dia./1200 mm F/L)|
|Eyepieces/Mag.||Pentax XW10 (120X)|
|Conditions||Mostly clear, calm|
|Sources||Atlas of the Moon by Antonín Rükl 2004|
* Based on published data.