NGC 5138

Number of stars per data source

	Reference   10 :   18 stars
	Reference   50 :    2 stars

10: Lindoff U.; (1972) Astron. Astrophys. Suppl. 7, 231; An investigation of four southern open clusters; 1972A&AS....7..231L
50: Cannon A.J., Pickering E.C.; (1918-1924), Ann. Obs. Harvard Coll. Obs. 91 to 99 and 100; Henry Draper catalogue and extension