Tamm is a shallow lunar impact crater. It is located to the west-northwest of the much larger and more prominent crater Chaplygin. Attached to the south-southwestern outer rim of Tamm is the smaller van den Bos. There is a gap in the southern rim where these two craters are joined together.
Coordinates | 4°24′S 146°24′E / 4.4°S 146.4°E |
---|---|
Diameter | 38 km |
Depth | Unknown |
Colongitude | 214° at sunrise |
Eponym | Igor Y. Tamm |
The rim of Tamm is worn and eroded, with old impact rims incising the northern edges. The rim edge is now a circular, uneven ring of ridges. The interior floor is level and is marked only by tiny craterlets and a few clefts along the edges. The floor has merged with the interior of van den Bos to the south.
It has been hypothesized that the fissured, viscous-appearing material within both Tamm and van den Bos was emplaced as impact melt from the Mendeleev basin 225 km to the northwest.[1]
By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Tamm.
Tamm | Latitude | Longitude | Diameter |
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X | 2.7° S | 145.5° E | 13 km |