NGC 663

Number of stars per data source

	Reference    1 : 1110 stars
	Reference    2 :  174 stars
	Reference    7 :   99 stars
	Reference   10 :   90 stars

1: Moffat A.F.J., Vogt N.; (1974) Veroeff. Astron. Inst. Bochum no 2; Photographische UBV-helligkeiten in 14 jungen Sternhaufen der nordlichen Milchstrasse; 1974VeBoc...2....1M
2: Hoag A.A., Johnson H.L., Iriarte B., Mitchell R.I., Hallam K.L., Sharpless S.; (1961) Publ. Us. Nav. Obs. XVII part VII, 347; Photometry of stars in galactic cluster fields
7: McCuskey S.W., Houk N.; (1964) Astron. J. 69, 412; Galactic structure in Cassiopeia; 1964AJ.....69..412M
10: Van den Bergh S.; (1978) Astron. J. 83, 1075; UBV photometry of the open cluster NGC 663; 1978AJ.....83.1075V