Collinder 223

Number of stars per data source

	Reference  326 :    1 star
	Reference  385 :    9 stars
	Reference  443 :  100 stars

326: Hog E., Fabricius C., Makarov V.V., Urban S., Corbin T., Wycoff G., Bastian U., Schwekendiek P., Wicenec A.; (2000) Astron. Astrophys. 357, L27; The Tycho-2 Catalogue; 2000A&A...355L..27H
385: Skrutskie M.F., Cutri .M., Weinberg M.D., Schneider S., Carpenter J.M., et al.; (2006) Astron. J. 131, 1163; The Two Micron All Sky Survey (2MASS); 2006AJ....131.1163S
443: Monet D.; (1998) U.S. Naval Observatory Flagstaff station; The USNO-A2.0 catalogue