NGC 6613

Number of stars per data source

	Reference   12 :   21 stars
	Reference   50 :    5 stars

References

 12
Lindoff U.
(1971) Astron. Astrophys. 15, 439
The open clusters NGC 6613 (M18) and NGC 6716
1971A&A....15..439L
 50
Cannon A.J., Pickering E.C.
(1918-1924), Ann. Obs. Harvard Coll. Obs. 91 to 99 and 100
Henry Draper catalogue and extension