Combination of 15, 1 minute images unfiltered.
SBIG STL-1001E CCD. 20" f/6.8 Dall-Kirkham cassegrain telescope at prime focus.
| Object Type | Open Cluster |
| Constellation | Auriga |
| Magnitude | 7.6 |
| Size | 16.0' x 16.0' |
Number 56 in the Herschel 400 list is NGC 1664, a moderately large and bright open cluster in Auriga. Rich in fainter stars grouped closely together in the central regions, the cluster is a fine sight in a small telescope.