NGC 6618
Number of stars per data source
Reference 14 : 34 stars
Reference 50 : 6 stars
Reference 54 : 10 stars
References
- 14
- Ogura K., Ishida K.
- (1976) Publ. Astron. Soc. Japan 28, 35
- UBV photometry of the stars in the fields of emission nebulae. II. M17
- 1976PASJ...28...35O
- 50
- Cannon A.J., Pickering E.C.
- (1918-1924), Ann. Obs. Harvard Coll. Obs. 91 to 99 and 100
- Henry Draper catalogue and extension
-
- 54
- Becker F.
- (1929-1938) Publ Astrophys. Obs. Potsdam vol. 27 and 28
- Spektral-Durchmusterung der Kapteyn-Eichfelder des Sudhimmels
-