Combination of 10, 1 minute images.
SBIG STL-1001E CCD. 20" f/6.8 Dall-Kirkham cassegrain telescope at prime focus.
| Object Type | Open Cluster |
| Constellation | Sagittarius |
| Magnitude | 7.5 |
| Size | 12.0' x 12.0' |
M 18 is a rather loose and poor open cluster of about 20 moderately bright stars in Sagittarius.