NGC 2251

Number of stars per data source

	Reference    2 :   59 stars
	Reference  221 :  610 stars

References

 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
 221
Zakharova P.E.
(1986) Astronomical-geodetical investigations p.134
Photographic UBV photometry of stars in the region of the open cluster NGC 2251