Berkeley 31

Number of stars per data source

	Reference   60 :  590 stars
	Reference  389 :  193 stars

References

 60
Guetter H.H.
(1993) Astron. J. 106, 220
Photometric study of the old galactic cluster Be31
1993AJ....106..220G
 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