NGC 2168

Number of stars per data source

	Reference   25 :   22 stars
	Reference   45 :   34 stars
	Reference   50 :   33 stars
	Reference   51 :    1 star
	Reference   53 :   70 stars

25: Zug R.S.; (1933) Lick Obs. Bull. 16, 119; An investigation of color excess in galactic star clusters
45: Wallenquist A.; (1929) Ann. Boscha Sterrenw. Lembang III no 2; A photometric investigation of the open cluster Messier 38 (NGC 2168)
50: Cannon A.J., Pickering E.C.; (1918-1924), Ann. Obs. Harvard Coll. Obs. 91 to 99 and 100; Henry Draper catalogue and extension
51: Cannon A.J., Mayall W.M.; 1949) Ann. Harvard Coll. Obs. 112; Henry Draper extension 2
53: Schwassmann A., van Rhijn P.J.; (1935-1953) Hamburger Sternw. Bergedorf vol. 1 - 5; Bergedorfer Spektral-Durchmusterung der 115 nordlichen Kapteynschen Eichfelder