NGC 457

Number of stars per data source

	Reference   34 :  103 stars
	Reference   50 :    3 stars

34: Boden E.; (1951) Uppsala Astr. Obs. Ann. 2 no 10; A research on the galactic clusters NGC 436 and NGC 457; 1951UppAn...2j...1B
50: Cannon A.J., Pickering E.C.; (1918-1924), Ann. Obs. Harvard Coll. Obs. 91 to 99 and 100; Henry Draper catalogue and extension