Dewar is a lunar impact crater that lies on the Moon's far side. Less than one crater diameter to the south-southwest is the crater Stratton. Vening Meinesz is a little over one crater diameter to the northwest. The slightly worn rim of this crater is roughly circular, with a small outward protrusion along the southern edge. The interior floor is marked by several small impacts along the eastern side.
Coordinates | 2°37′S 165°37′E / 2.61°S 165.62°E |
---|---|
Diameter | 46.31 km |
Depth | Unknown |
Colongitude | 195° at sunrise |
Eponym | James Dewar |
The crater was named after British chemist James Dewar by the IAU in 1970.[1]
Dewar lies on the south side of an anomalously low albedo area of terrain (dark patch) on the far side of the Moon. The low-albedo area is also a geochemical anomaly, and is high in iron oxide and titanium dioxide. It has been interpreted as a cryptomare.[2]
By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Dewar.
Dewar | Latitude | Longitude | Diameter |
---|---|---|---|
E | 2.3° S | 167.8° E | 15 km |
F | 2.8° S | 167.5° E | 14 km |
S | 3.1° S | 163.9° E | 23 km |