NGC 663

Number of stars per data source

	Reference  304 :  480 stars
	Reference  312 :  875 stars
	Reference  326 :    4 stars
	Reference  454 :  290 stars

304: Pigulski A., Kopacki G., Kolaczkowski Z.; (2001) Acta Astron. 51, 159; A CCD search for variable stars of spectral B in the northern hemisphere open clusters. IV. NGC 663; 2001AcA....51..159P
312: Pigulski A., Kopacki G., Kolaczkowski Z.; (2001) Astron. Astrophys. 376, 144; The young open cluster NGC 663 and its Be stars; 2001A&A...376..144P
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
454: Fabregat J., Capilla G.; (2005) Mon. Not. R. Astron. Soc. 358, 66; CCD uvby beta photometry of the young open cluster NGC 663; 2005MNRAS.358...66F