Byrgius (crater)
Encyclopedia
Byrgius is a lunar
crater
located in the western part of the Moon
, near the limb. As a result Byrgius appears strongly oval in form due to foreshortening. To the northwest is the nearly ruined crater Lamarck
. The rim of Byrgius is worn and eroded, with Byrgius A overlying the eastern rim and Byrgius D lying across the northwest. The floor is relatively flat and undistinguished by significant craterlets. Byrgius A possesses its own ray system
that extends for over 400 kilometres.
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...
located in the western 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...
, near the limb. As a result Byrgius appears strongly oval in form due to foreshortening. To the northwest is the nearly ruined crater Lamarck
Lamarck (crater)
Lamarck is a crater in the southwestern part of the Moon. The northern portion of the crater is overlain by the walled plain Darwin. To the southeast is Byrgius....
. The rim of Byrgius is worn and eroded, with Byrgius A overlying the eastern rim and Byrgius D lying across the northwest. The floor is relatively flat and undistinguished by significant craterlets. Byrgius A possesses its own 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 over 400 kilometres.
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 Byrgius.| Byrgius | Latitude | Longitude | Diameter |
|---|---|---|---|
| A | 24.5° S | 63.7° W | 19 km |
| B | 23.9° S | 60.8° W | 23 km |
| D | 24.1° S | 67.1° W | 27 km |
| E | 23.5° S | 66.2° W | 18 km |
| H | 23.7° S | 62.4° W | 27 km |
| K | 23.0° S | 61.8° W | 14 km |
| N | 22.3° S | 63.1° W | 20 km |
| P | 22.6° S | 64.1° W | 19 km |
| R | 26.5° S | 60.7° W | 7 km |
| S | 26.2° S | 61.4° W | 43 km |
| T | 25.1° S | 61.5° W | 5 km |
| U | 25.8° S | 67.2° W | 13 km |
| V | 26.0° S | 67.8° W | 9 km |
| W | 26.1° S | 68.5° W | 14 km |
| X | 25.7° S | 65.4° W | 6 km |