Collinder 121

Number of stars per data source

	Reference   15 :    1 star
	Reference   58 :    3 stars

15: Goodenough D.G.; (1970) Bull. American Astron.Soc. 2, 318; Six colour photometry of galactic clusters; 1970BAAS....2..318G
58: Dean J.F.; (1981) SAAO Circ. 6, 10; DDO observations of southern stars; 1981SAAOC...6...10D