Langrenus

D=132 km
Center: 9¡S, 61¡E

Count Area: 2575 km^2
Observed Density (@ 1km): 5500 ± 1500
Age: 3.4 ± 0.2 (+sec: 3.6)
Stoffler epoch: Late Imbrian
Fit Density (@ 1 km): 4700 ± 500
PF fit: good

Age calculation notes:
Some data points ~ 1km fall above the MPF, but are still within error. Used Melosh gravity scaling law.

USGS geology: 
Copernican

Wilhelms: 
Eratosthenian

Floor material: 
Peak is small and sharp, and crater is deep. About half of floor smooth and other half hummocky (avoided). Surrounded by craters that appear to be filled with mare. Smooth area likely impact melt. Likely original.

Geology Observations: 
Ejecta blanket and some secondaries visible, and rays observed on Mare. See no evidence of collapses. Rim sharp. Several secondary clusters/chains observed, up to a km in size, some fresh. 

SFD Observations: 
Flatter slope - has uptick at ~ 1.5 km, which prevents from being steep. Dominated by class 3 for small craters and 1,2,4 for larger. Classes have similar shape to "all" within error. Slope(Diff)=-3.9 ± 0.4
Secondaries have steeper shape. Slope(sec)=-5.2 ± 0.1

From Baldwin (1985):
Area: 4818 km^2 (ejecta?)
Density (@ 1km): 3300 ± 320
Age: 1.826 ± 0.245 Ga

Neukum & Konig also have a density = 4900 (ejecta & interior)


Last Edited by MRK 1/10/2014