Berkeley 87

Number of stars per data source

	Reference  128 :   42 stars
	Reference  295 :    4 stars

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
295: Massey P., DeGioia-Eastwood K., Waterhouse E.; (2001) Astron. J. 121, 1050; The progenitor masses of Wolf-Rayet stars and luminous blue variables determined from cluster turnoffs. II. Results from 12 galactic clusters and OB associations; 2001AJ....121.1050M