NGC 6633

Number of stars per data source

	Reference   19 :  125 stars
	Reference   47 :    2 stars
	Reference   50 :   45 stars

19: Kopff E.; (1943) Astron. Nach. 274, 69; Untersuchung der offenen Sternhaufen IC 4665, NGC 6633, IC 4756; 1943AN....274...69K
47: Geyer E.H., Nelles B.; (1985) Astron. Astrophys. Suppl. 62, 301; Galactic cluster star radial velocities obtained with a focal reducer field spectrograph; 1985A&AS...62..301G
50: Cannon A.J., Pickering E.C.; (1918-1924), Ann. Obs. Harvard Coll. Obs. 91 to 99 and 100; Henry Draper catalogue and extension