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 | Cassopeia |
| Magnitude | 8.5 |
| Size | 5.0' x 5.0' |
NGC 7790 is number 399 in the Herschel 400 list. NGC 7790 is the brighter of a pair of open clusters visible in the same low-magnification field. The other cluster is NGC 7788, visible in the upper right of the above image. The glow at the bottom is caused be the 6th magnitude star, SAO 20954. This is a Betelguese-type red supergiant.