IC 4756
Number of stars per data source
Reference 19 : 131 stars
Reference 50 : 37 stars
References
- 19
- Kopff E.
- (1943) Astron. Nach. 274, 69
- Untersuchung der offenen Sternhaufen IC 4665, NGC 6633, IC 4756
- 1943AN....274...69K
- 50
- Cannon A.J., Pickering E.C.
- (1918-1924), Ann. Obs. Harvard Coll. Obs. 91 to 99 and 100
- Henry Draper catalogue and extension
-