NGC 2420

Number of stars per data source

	Reference   24 :  671 stars
	Reference  246 :   75 stars
	Reference  505 : 1151 stars

24: Anthony-Twarog B.J., Kaluzny J., Shara M.M., Twarog B.A.; (1990) Astron. J. 99, 1504; A CCD photometric analysis of the old open cluster NGC 2420; 1990AJ.....99.1504A
246: Stetson P.B.; (2000) Publ. Astron. Soc. Pacific 112, 925; Homogeneous photometry for star clusters and resolved galaxies. II. Photometric standard stars; 2000PASP..112..925S
505: Sharma S., Pandey A.K., Ogura K., Mito H., Tarusawa K., Sagar R.; (2006) Astron. J. 132, 1669; Wide-Field CCD Photometry around Nine Open Clusters; 2006AJ....132.1669S