Berkeley 27

Number of stars per data source

	Reference  389 :  155 stars
	Reference  478 : 1627 stars

389: Hasegawa T., Malasan H.L., Kawakita H., Obayashi H., Kurabayashi T., Nakai T., Hyakkai M., Arimoto N.; (2004) Publ. Astron. Soc. Japan 56, 295; New photometric data of old open clusters in the anti-galactic center region; 2004PASJ...56..295H
478: Carraro G., Costa E.; (2007) Astron. Astrophys. 464, 573; Photometry of the five marginally studied open clusters Collinder 74, Berkeley 27, Haffner 8, NGC 2509, and VdB-Hagen 4; 2007A&A...464..573C