Berkeley 56

Number of stars per data source

	Reference  470 : 4117 stars
	Reference  549 : 4997 stars

470: Carraro G., Subramaniam A., Janes K.A.; (2006) Mon. Not. R. Astron. Soc. 371, 1301; Fundamental parameters of six neglected old open clusters; 2006MNRAS.371.1301C
549: Janes K.A., Hoq S.; (2011) Astron. J. 141, 92; A Quantitative Analysis of Distant Open Clusters; 2011AJ....141...92J