Ansgarius

D=95 km
Center: 13°S, 80°E

Count Area: 1366 km^2
Observed Density (@ 1km): 29300 ± 4700
Age: 3.9 ± 0.1 (+sec: 4.0)
Stoffler epoch: Nectarian
Fit Density (@ 1km): 29100 ± 1500
PF fit: good?, largest craters randomly around fit, many secondaries

Age calculation notes:
good fit (SM).
good fit - large D within error - use as is; including OSs improves fit, makes slightly older (MRK).

USGS geology: 
Crater rim material mapped as mid-Imbrian. Very small part of floor mapped as Imbrian plains.

Wilhelms: 
Crater and floor is Nectarian.

Floor material: 
Best guess is not original. Generally smooth floor. Looks like part of floor is covered by La Perouse ejecta or a wall collapse (not included). Plus no obvious peak. However, no strong embayment evidence. Has softened appearance? Soft?

Geology Observations: 
Much of ejecta blanket eroded, some left near rim. No central peak. Floor mostly flat. Some collapse/ejecta at 11:00 position at the rim (avoided). Small hills located here and there. Degraded secondary clusters and chains observed all over crater. Contain craters of various sizes (up to ~ 2.5 km). 

SFD Observations: 
Dominated by classes 3 & 4. Classes 1 & 2 much lower density. Flat to possibly steep distribution. No shallow "right ear". Slope(Diff)=3.4 ± 0.4.

Discussion notes: older than expected, possibly secondaries - perhaps not good candidate for PF comp and age

Last Edited by MRK 11/14/2012