Elger (crater)
Encyclopedia
Elger is a lunar
crater
that lies along the southern edge of Palus Epidemiarum
, the Marsh of Epidemics, in the southwest part of the Moon
's near side. To the northeast is the flooded crater Capuanus
, and farther to the northwest is Ramsden
.
The rim of this formation is rough and somewhat eroded formation, with a break and an outward bulge along the northern end, while a ridge intrudes into the southern rim. The interior has been resurfaced by lava
, although the albedo
of the floor is not quite as low as the lunar mare
surface to the north.
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...
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 lies along the southern edge of Palus Epidemiarum
Palus Epidemiarum
Palus Epidemiarum is a small lunar mare in the southwestern part of the Moon's near side. It lies to the southwest of Mare Nubium, and southeast of Mare Humorum...
, the Marsh of Epidemics, in the southwest part 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...
's near side. To the northeast is the flooded crater Capuanus
Capuanus (crater)
Capuanus is a lunar crater that lies along the southern edge of the Palus Epidemiarum. The outer rim is eroded and indented by lesser crater impacts, with notches in the north, west, and southern parts of the rim. The interior floor has been resurfaced by basaltic lava, which is connected to the...
, and farther to the northwest is Ramsden
Ramsden (crater)
Ramsden is a lunar impact crater located on the western stretch of the Palus Epidemiarum. To the east-southeast is the crater Capuanus, and to the north lies Dunthorne....
.
The rim of this formation is rough and somewhat eroded formation, with a break and an outward bulge along the northern end, while a ridge intrudes into the southern rim. The interior has been resurfaced by lava
Lava
Lava refers both to molten rock expelled by a volcano during an eruption and the resulting rock after solidification and cooling. This molten rock is formed in the interior of some planets, including Earth, and some of their satellites. When first erupted from a volcanic vent, lava is a liquid at...
, although the 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...
of the floor is not quite as low as the lunar mare
Lunar mare
The lunar maria are large, dark, basaltic plains on Earth's Moon, formed by ancient volcanic eruptions. They were dubbed maria, Latin for "seas", by early astronomers who mistook them for actual seas. They are less reflective than the "highlands" as a result of their iron-rich compositions, and...
surface to the north.
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 Elger.| Elger | Latitude | Longitude | Diameter |
|---|---|---|---|
| A | 37.3° S | 31.2° W | 8 km |
| B | 37.1° S | 32.0° W | 8 km |