Tamm (crater)

Tamm
	Lunar Orbiter 1 image
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

Oblique Apollo 17 panoramic camera image with Tamm above center and van den Bos below center

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.

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]

Satellite craters

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
X	2.7° S	145.5° E	13 km

References

^ The geologic history of the Moon, 1987, Wilhelms, Don E.; with sections by McCauley, John F.; Trask, Newell J. USGS Professional Paper: 1348. (online), Figure 6.13 H

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McDowell, Jonathan (July 15, 2007). "Lunar Nomenclature". Jonathan's Space Report. Retrieved 2007-10-24.
Menzel, D. H.; Minnaert, M.; Levin, B.; Dollfus, A.; Bell, B. (1971). "Report on Lunar Nomenclature by the Working Group of Commission 17 of the IAU". Space Science Reviews. 12 (2): 136–186. Bibcode:1971SSRv...12..136M. doi:10.1007/BF00171763. S2CID 122125855.
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Webb, Rev. T. W. (1962). Celestial Objects for Common Telescopes (6th revised ed.). Dover. ISBN 978-0-486-20917-3.
Whitaker, Ewen A. (1999). Mapping and Naming the Moon. Cambridge University Press. ISBN 978-0-521-62248-6.
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[1] The geologic history of the Moon, 1987, Wilhelms, Don E.; with sections by McCauley, John F.; Trask, Newell J. USGS Professional Paper: 1348. (online), Figure 6.13 H

[1]