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