Ohm (crater)

Ohm
	LRO WAC image
Coordinates	18°19′N113°47′W / 18.32°N 113.78°W
Diameter	61.75 km (38.37 mi)
Depth	Unknown
Colongitude	114° at sunrise
Eponym	Georg S. Ohm

Last updated January 10, 2025

Ohm is a lunar impact crater that is located on the far side of the Moon. It lies to the south of the crater Comrie, and the satellite crater Comrie K is attached to Ohm's northeastern rim. To the northwest is the larger Shternberg, and to the southwest is Kamerlingh Onnes.

This crater is located at the origin of a ray system that extends for several hundred kilometers across the surrounding lunar terrain. The exterior surface for about 20–30 km is relatively free of the ray material, but beyond that perimeter is a skirt of higher albedo, with streaks extending to the northwest, east-northeast, and southwards. The crater is part of the Copernican System.^[1]

The outer rim of Ohm is sharply defined, except at the southern end where the edge is somewhat irregular. The inner surface drops down to an interior blanket of slumped material that slopes down to the floor. The crater lacks a notable central peak.

Prior to formal naming by the IAU in 1970,^[2] Ohm was called Crater 253.^[3]

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<span class="mw-page-title-main">Chapman (crater)</span> Crater on the Moon

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Parenago is an impact crater on the Moon's far side, behind the eastern limb. Nearly attached to the east-southeastern outer rim of Parengo is the crater Berkner. To the south-southwest lies Comrie.

Shternberg is an eroded lunar impact crater on the Moon's far side. It lies just to the west-northwest of the crater Ohm, and is completely covered by higher-albedo material from the ray system that surrounds Ohm. To the west-southwest of Shternberg is Weyl, and to the west-northwest is Comstock. Less than one crater diameter to the northeast of Shternberg is Comrie.

References

↑ Stratigraphy of Lunar Craters, Don E. Wilhelms and Charles J. Byrne, January 23, 2009
↑ Ohm, Gazetteer of Planetary Nomenclature, International Astronomical Union (IAU) Working Group for Planetary System Nomenclature (WGPSN)
↑ Lunar Farside Chart (LFC-1A), 2nd Edition October 1967

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[1] Stratigraphy of Lunar Craters, Don E. Wilhelms and Charles J. Byrne, January 23, 2009

[2] Ohm, Gazetteer of Planetary Nomenclature, International Astronomical Union (IAU) Working Group for Planetary System Nomenclature (WGPSN)

[3] Lunar Farside Chart (LFC-1A), 2nd Edition October 1967

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LRO WAC image
Coordinates	18°19′N113°47′W / 18.32°N 113.78°W / 18.32; -113.78
Diameter	61.75 km (38.37 mi)
Depth	Unknown
Colongitude	114° at sunrise
Eponym	Georg S. Ohm