NGC 1931
Number of stars per data source
Reference 81 : 136 stars
References
81
Bhatt B.C., Pandey A.K., Mahra H.S., Paliwal D.C.
(1994) Bull. Astron. Soc. India 22, 291
CCD photomery of galactic open clusters - III. NGC 1931
1994BASI...22..291B