| NGC 6939 | |
|---|---|
 NGC 6939 | |
| Observation data (J2000 epoch) | |
| Right ascension | 20h 31m 30s[1] |
| Declination | +60° 39′ 42″[1] |
| Distance | 3,860 ly (1,185 pc[2]) |
| Apparent magnitude (V) | 7.8 [1] |
| Apparent dimensions (V) | 7' |
| Physical characteristics | |
| Estimated age | 2.2 billions years[2] |
| Other designations | Melotte 231 |
| Associations | |
| Constellation | Cepheus |
NGC 6939 is an open cluster in the constellation Cepheus. It was discovered by William Herschel in 1798. The cluster lies 2/3° northwest from the spiral galaxy NGC 6946. The cluster lies approximately 4,000 light years away and it is over a billion years old.
- ^ a b c "NGC 6939". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-06-19.
- ^ a b WEBDA: NGC 6939