Pythagoras

D= 145 km
Center: 64¡N, 297¡E

Count Area: 2851 km^2
Observed Density (@ 1km): 3200 ± 1100
Simone's Age: 3.5 ± 0.2
Fit Density (@ 1km): 5100 ± 1000
Stoffler epoch: Late Imbrian
PF fit: OK
 
Age calculation notes:
Enough data and decent error bars, but several points fall off the line. Craters ~ 1 km fall below and the largest bin falls above. Used Melosh gravity scaling.

USGS geology: 
Eratosthenian 

Wilhelms:
Eratosthenian

Floor material: 
Best guess is original. Hummocky floor, fresh peak, deep rim. Some smooth areas may be impact melt.

Geology Observations: 
Ejecta blanket fairly fresh and covers many surrounding terrains (also impact melt ponds possibly visible). Rim looks sharp and fresh. Moderate, fresh central peak. Floor flat in some areas, very hummocky in others (very hummocky areas not included). A few secondary chains/clusters that are small (< 1.3 km).

SFD Observations: 
Small craters (< 1.0 km) dominated by classes 3 & 4, but 1 & 2 not much lower. Large craters dominated by fresher classes. Distribution < 2 km steep. Shallow "right ear". Slope(Diff)=-5.3 ± 0.6. Secondaries have a "skinnier" v-shape. Slope(sec)=-3.0 ± 2.7

Also examined by Baldwin (1985) and McEwen et al. (1993).
Baldwin: density=2000 ± 250, age=0.834 ± 0.191 Ga, area=9897 km^2 (ejecta?)
McEwen: density=6600, age=3.6 Ga

Last Edited by MRK 1/10/2014