IC 2581

Number of stars per data source

	Reference   16 :    4 stars
	Reference   33 :    1 star
	Reference   71 :   37 stars
	Reference   94 :    3 stars
	Reference  128 :   28 stars

16: Stephenson C.B., Sanduleak N.; (1971) Publ. Warner Swasey Obs. 1 no 1; Luminous stars in the southern Milky Way
33: Egret D.; (1986) Private communication; Coordinates from SIMBAD (other than SAO)
71: Mermilliod J.-C.; (1988); Positions measured with the Hipad tablet
94: Larsson-Leander G.; (1957) Stockholms Obs. Ann. 20 no 2; A study of the galactic cluster NGC 1664; 1957StoAn..20b...1L
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