Observation Notes:
After spending time on Shickard, I moved Northward to Billy Crater. It showed a nice intact rim with a dark flooded floor. There were two white splashes on the south-southwest and south-southeast ends of the crater floor. Immediately north of the crater was a bright white spray that radiated southward. A broad road of lighter material flowed away from the west side of the crater and curved northwest.
Factoids:
Billy Crater is a 46 km wide crater with a 1300 m high rim. Its floor is one of the darkest spots on the moon. It was formed more than 3.2 billion years ago--prior to the lava flows that filled Oceanus Procellarum. The "bright spray" I saw north of Billy is a 30 km wide massif called Mons Hansteen
| Subject | Billy Crater and Mons Hansteen |
| Classification | Lunar Crater and Mountain |
| Position | West edge |
| Phase/Age | 12 days old |
| Size* | Billy Crater: (dia. 46 km); Mons Hansteen (width 30 km) |
| Date/Time | January 22, 2005 - 10:05 PM (January 23, 2005 - 05:05 UT) |
| Observing Loc. | Flagstaff, AZ - Home |
| Instrument | Orion SVP 6LT Reflector (150 mm dia./1200 mm F/L) |
| Eyepieces/Mag. | 10 mm + 2X Barlow (240X) |
| Conditions | Clear, cool (34°F) |
| Seeing | 4-5/10 |
| Sources | The Moon Observer's Guide By Peter Grego Moonwatch |
* Based on published data.
