NGC 1857

Number of stars per data source

	Reference    1 :    1 star
	Reference   71 :    9 stars
	Reference  109 :   13 stars
	Reference  128 :   14 stars

1: Egret D.; (1986) Private Communication; Coordinates from SIMBAD (mainly SAO)
71: Mermilliod J.-C.; (1988); Positions measured with the Hipad tablet
109: Cuffey J.; (1937) Harvard Coll. Obs. Ann. 105, 43; Red indices in galactic clusters
128: Lasker B.M., Russel J.N., Jenkner H., Sturch C.R., McLean B.J., Shara M.M.; (1990) Astron. J. 99, 2019; The HST guide star catalogue, version 1.0; 1990AJ.....99.2019L