King 21

Number of stars per data source

	Reference  431 :    4 stars
	Reference 1085 :   26 stars

431: Haug U.; (1970) Astron. Astrophys. Suppl. 1, 35; UBV observations of luminous stars in three Milky Way fields; 1970A&AS....1...35H
1085: Mohan V., Pandey A.K.; (1984) Bull. Astron. Soc. India 12, 217; Photometry of the open cluster King 21; 1984BASI...12..217M