Larmor (crater)
Encyclopedia
Larmor is a crater
on the Moon
's far side. It is located to the east-southeast of Shayn
and due north of Dante
. It is named in honor of the physicist Joseph Larmor
.
The rim of Larmor is broken across by the satellite crater Larmor Z. The remaining rim is slightly worn, particularly to the southwest, and the inner wall is somewhat wider at the southern end. The wider southern inner wall displays terrace structures. Near the mid-point of the otherwise relatively level interior floor are some low hill features.
The satellite crater Larmor Q, located about one and a half crater diameters to the southwest of Larmor, lies at the center of a ray system
. These rays lie primarily within cones to the north and southeast, which a 120° arc to the west is free of ray material.
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...
on 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...
's far side. It is located to the east-southeast of Shayn
Shayn (crater)
Shayn is an eroded impact crater that lies on the Moon's far side. It lies to the north of the crater Freundlich and northeast of Trumpler. To the west of Shayn is the crater Nusl, and to the north-northeast lies Champollion....
and due north of Dante
Dante (crater)
Dante is a lunar crater that is located on the far side of the Moon. It lies in the northern hemisphere exactly opposite the prime meridian facing the Earth. The nearest craters of note are Larmor to the north and Morse to the southeast. To the southwest is the oddly shaped Buys-Ballot.This crater...
. It is named in honor of the physicist Joseph Larmor
Joseph Larmor
Sir Joseph Larmor , a physicist and mathematician who made innovations in the understanding of electricity, dynamics, thermodynamics, and the electron theory of matter...
.
The rim of Larmor is broken across by the satellite crater Larmor Z. The remaining rim is slightly worn, particularly to the southwest, and the inner wall is somewhat wider at the southern end. The wider southern inner wall displays terrace structures. Near the mid-point of the otherwise relatively level interior floor are some low hill features.
The satellite crater Larmor Q, located about one and a half crater diameters to the southwest of Larmor, lies at the center of a 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...
. These rays lie primarily within cones to the north and southeast, which a 120° arc to the west is free of ray material.
Satellite craters
By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to Larmor.| Larmor | Latitude | Longitude | Diameter |
|---|---|---|---|
| K | 30.3° N | 179.0° W | 24 km |
| Q | 28.6° N | 176.2° E | 22 km |
| W | 33.3° N | 177.6° E | 27 km |
| Z | 33.7° N | 179.8° W | 49 km |