Ohm (crater)
Encyclopedia
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 an extensive 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 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.
Moon
The Moon is Earth's only known natural satellite,There are a number of near-Earth asteroids including 3753 Cruithne that are co-orbital with Earth: their orbits bring them close to Earth for periods of time but then alter in the long term . These are quasi-satellites and not true moons. For more...
impact crater
Impact crater
In the broadest sense, the term impact crater can be applied to any depression, natural or manmade, resulting from the high velocity impact of a projectile with a larger body...
that is located on the far side of the Moon
Moon
The Moon is Earth's only known natural satellite,There are a number of near-Earth asteroids including 3753 Cruithne that are co-orbital with Earth: their orbits bring them close to Earth for periods of time but then alter in the long term . These are quasi-satellites and not true moons. For more...
. It lies to the south of the crater Comrie
Comrie (crater)
Comrie is a lunar crater. It is located on the rugged far side of the Moon relative to the Earth, beyond the western limb. Nearby craters of note include Ohm to the south-southwest, Shternberg to the southwest, and Parenago to the northeast....
, and the satellite crater Comrie K is attached to Ohm's northeastern rim. To the northwest is the larger Shternberg
Shternberg (crater)
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...
, and to the southwest is Kamerlingh Onnes
Kamerlingh Onnes (crater)
Kamerlingh Onnes is a lunar crater on the far side of the Moon. It lies less than a crater diameter to the north-northwest of the crater Kolhörster. North of Kamerlingh Onnes lies Shternberg and to the northwest is Weyl....
.
This crater is located at the origin of an extensive ray system
Ray system
A ray system comprises radial streaks of fine ejecta thrown out during the formation of an impact crater, looking a bit like many thin spokes coming from the hub of a wheel. The rays can extend for lengths up to several times the diameter of their originating crater, and are often accompanied by...
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
Albedo
Albedo , or reflection coefficient, is the diffuse reflectivity or reflecting power of a surface. It is defined as the ratio of reflected radiation from the surface to incident radiation upon it...
, with streaks extending to the northwest, east-northeast, and southwards.
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.