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| General characteristics | |
|---|---|
| Latitude | 1.9° S |
| Longitude | 47.6° E |
| Diameter | 9 × 11 km |
| Depth | 1.3 km |
| Colongitude | 313° at sunrise |
| Name source | Charles Messier |
Messier is a relatively young lunar impact crater located on the Mare Fecunditatis. The crater has a discernable oblong shape that is not caused by foreshortening. The longer dimension is oriented in an east-west direction.
Just to the west lies Messier A, a similar-sized crater with an oblong, doublet form. The longer dimension of this crater is oriented north-south, at right angles to Messier crater. This crater also has a curved bulge extending to the west.
The interior of craters Messier and Messier A have a higher albedo than the surrounding maria. There is also a dark streak in the center of each crater. Two prominent, nearly linear rays extend westward from the rim of Messier A, continuing over 100 kilometers toward the east edge of Mare Fecunditatis. The maria about the craters is also lightly marked by rays from other craters.
It is theorized that Messier crater was formed by an impact at a very low angle, and that Messier A could have formed following a rebound by the impacting body. The low angle of impact may also explain the asymmetrical ray system.
To the northwest of Messier A is a long, narrow rille.
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 Messier crater.
| Messier | Latitude | Longitude | Diameter |
|---|---|---|---|
| A | 2.0° S | 47.0° E | 11 x 13 km |
| B | 0.9° S | 48.0° E | 6 km |
| D | 3.6° S | 46.3° E | 8 km |
| E | 3.3° S | 45.4° E | 5 km |
| J | 1.5° S | 52.1° E | 4 km |
| L | 1.2° S | 51.8° E | 6 km |
The following crater has been renamed by the IAU.
In the past Messier A was named the W. H. Pickering crater.
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