NGC 581

Number of stars per data source

	Reference  264 :  311 stars
	Reference  326 :    4 stars
	Reference  480 :   15 stars

264: Sanner J., Geffert M., Brunzendorf J., Schmoll J.; (1999) Astron. Astrophys. 349, 448; Photometric and kinematic studies of open star clusters. I. NGC 581 (M 103); 1999A&A...349..448S
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
480: Lee H., Kim S.-L., Kim H.-J., Jeon Y.-B., Park H.-S.; (2005) Inf. Bull. Var. Stars No 5656; New Variable Stars in the Open Cluster M103 (NGC 581); 2005IBVS.5656....1L