Open Cluster NGC 637
History
This cluster was discovered by William Herschel on 9 November 1787 and cataloged as «seventh class: pretty much compressed clusters of large or small stars» with the designation VII 49. He noted: «A cluster of some considerably large stars and many extremely small so as hardly to be seen. The large stars arranged in circular order 3 or 4' diameter.» [464]
Physical Properties
| Designation | NGC 637 |
| Type | OCL (I3p) |
| Right Ascension (J2000.0) | 01h 43m 03.0s |
| Declination (J2000.0) | +64° 02' 12" |
| Diameter | 3 arcmin |
| Visual magnitude | 8.2 mag |
| Metric Distance | 2.160 kpc |
| Dreyer Description | Cl, pS, B & vF st |
| Identification, Remarks | WH VII 49; GC 378; OCL 329 |
Finder Chart
The open cluster NGC 637 is located in the constellation Cassiopeia. It is on 20 October in opposition to the Sun. From Switzerland they can best be seen in the months July to January.
