NGC 2251

Number of stars per data source

	Reference   69 :    1 star
	Reference  115 :    3 stars

69: Schmidt E.G.; (1984) Astrophys. J. Suppl. 55, 455; Yellow giants in young clusters. I. Photometric observations; 1984ApJS...55..455S
115: Celeste Parisi M., Claria J.J., Piatti A.E., Geisler D.; (2005) Mon. Not. R. Astron. Soc. 363, 1247; Washington photometry of open cluster giants: two moderately metal-poor anticentre clusters; 2005MNRAS.363.1247P