Ioffe

D=84 km
Center: 14°S, 231°E

Count Area: 851 km^2
Observed Density (@ 1km): 7100 ± 2900
Age: 3.6 ± 0.1 (+sec: 3.7)
Stoffler epoch: Late Imbrian
Fit Density (@ 1km): 6900 ± 800
PF fit: good, area < 1000 km2, smallest craters in slight excess

Age calculation notes:
~ good fit (SM).
good fit - one point slightly off - use as is; adding OSs does not change fit but does increase age slightly (MRK).

USGS geology: 
Crater itself is Late Imbrian, but plains mapped in middle as Imbrian, possibly late. Large crater at 1:00 mapped as a secondary crater (Orientale?).

Wilhelms: 
Friedman confused with Ioffe - Ioffe not mapped - Friedman labeled as Late Imbrian.

Floor material: 
Best guess is not original. USGS has mapped as fill. Small peak. Softened appearance. Soft?

Geology Observations: 
Ejecta blanket visible, but not bright in WAC and somewhat eroded. Small central peak, looks eroded. Half of floor is smooth, other hummocky (avoided). Large crater at 1:00 may caused collapse and some resurfacing by ejecta. A few secondary clusters/chains observed with small craters (< 1.3 km).

SFD Observations: 
Classes fairly equal in density (2 has lowest). Steeper distribution. No shallow "right ear". Slope(Diff)=5.0 ± 0.7

Discussion notes: no issues

Last Edited by MRK 12/13/2012