Helmholtz (lunar crater)
Encyclopedia
Helmholtz is a lunar
impact crater
that is located near the south-southeast limb of the Moon
. Attached to the south-southeast rim of Helmholtz is the somewhat smaller crater Neumayer
. The larger crater Boussingault
is nearly attached to the west-southwestern rim.
The outer rim of Helmholtz is worn and rounded, although not significantly disrupted. The edge of the rim can still be discerned around the perimeter, although several small craters lie along the inner edge. One such crater lies across the inner southeast wall, and a pair occupies the opposite inner wall to the northeast. There are also a couple of smaller craterlets just inside the north rim.
The northern half of the interior floor is level and marked only by a few very tiny craterlets. The southern floor is more irregular due to the overlaying ejecta from Neumayer and Boussingault, and is marked by a pair of tiny craters in the southeast. There is no 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 near the south-southeast limb 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...
. Attached to the south-southeast rim of Helmholtz is the somewhat smaller crater Neumayer
Neumayer (crater)
Neumayer is a lunar impact crater that lies near the southern limb of the Moon. At this location the crater appears much foreshortened and can only be observed during favorable librations. It is attached to the southeastern rim of the slightly larger crater Helmholtz...
. The larger crater Boussingault
Boussingault (crater)
Boussingault is a large lunar crater that lies near the rugged southeast limb of the Moon. Because of its location, Boussingault appears highly oblong in shape due to foreshortening. To the southwest is the crater Boguslawsky, and almost attached to the northeast rim is Helmholtz...
is nearly attached to the west-southwestern rim.
The outer rim of Helmholtz is worn and rounded, although not significantly disrupted. The edge of the rim can still be discerned around the perimeter, although several small craters lie along the inner edge. One such crater lies across the inner southeast wall, and a pair occupies the opposite inner wall to the northeast. There are also a couple of smaller craterlets just inside the north rim.
The northern half of the interior floor is level and marked only by a few very tiny craterlets. The southern floor is more irregular due to the overlaying ejecta from Neumayer and Boussingault, and is marked by a pair of tiny craters in the southeast. There is no central peak.
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 Helmholtz.| Helmholtz | Latitude | Longitude | Diameter |
|---|---|---|---|
| A | 64.4° S | 51.5° E | 16 km |
| B | 67.8° S | 68.4° E | 10 km |
| D | 66.3° S | 54.3° E | 46 km |
| F | 64.3° S | 60.1° E | 53 km |
| H | 64.5° S | 65.2° E | 18 km |
| J | 64.8° S | 67.8° E | 22 km |
| M | 65.2° S | 51.1° E | 21 km |
| N | 64.8° S | 50.1° E | 13 km |
| R | 63.5° S | 54.7° E | 12 km |
| S | 64.3° S | 56.6° E | 31 km |
| T | 65.7° S | 59.7° E | 31 km |