Eratosthenes

D=59 km
Center: 15¡N, 349¡E

Floor Area = 465 km^2
Observed Density (@ 1km): 5000 ± 3300
Simone's Age: 2.6 ± 0.4 (+sec: 3.7)
Stoffler epoch: Eratosthenian
Fit Density (@ 1km): 3400 ± 500
PF fit: OK


Age Calculation Notes: 
While the match between data and MPF is good, the error bars on the data is large and there are a small number of points. Last bin falls a little above. Used Melosh gravity.

USGS geology: 
Eratosthenian

Wilhelms: 
Eratosthenian

Floor material: 
Deep crater and large, but slightly eroded, peak. Hummocky and smoother areas. No evidence of embayment at crater wall. Far enough away from Copernicus ejecta blanket. Likely original.

Geology Observations: 
Ejecta blanket and secondary field visible, but eroded. Rim looks slightly eroded. Collapse on NW side of crater (excluded), cause uncertain. Some large unusually shaped craters (D ~ 1 km), likely secondaries from Copernicus. Copernicus secondaries may be pervasive. Formed on mare.

SFD Observations: 
Slightly steep shape. Dominated by classes 2,3,4. Classes have similar shape within error. Slope(Diff)=-4.2 ± 0.3
Secondaries shallower. Slope not calculated - only two points. 


Examined by Baldwin (1985)
Area: 1710 km^2 (likely ejecta)
Density (@ 1km): 4800 ± 240
Age: 2.971 ± 0.183 Ga

Also examined by Neukum & Konig (1976)
Area: ? (interior and ejecta)
Density (@ 1km): 2500
Age: 3.2 Ga (in McEwen et al.. 1993)


Last Edited by MRK 1/10/2014