NGC 6939
Number of stars per data source
Reference 17 : 11 stars
References
- 17
- Canterna R., Geisler D., Harris H.C., Olszewski E., Schommer R.
- (1986) Astron. J. 92, 79
- Washington photometry of open cluster giants: the metal-rich clusters
- 1986AJ.....92...79C