NGC 4609
Number of stars per data source
Reference 3 : 2 stars
Reference 4 : 1 star
References
- 3
- Crawford D.L., Barnes J.V.
- (1969) Astron. J. 74, 407
- Four-color and Hbeta photometry of open clusters II. Coma and Ursa Major
- 1969AJ.....74..407C
- 4
- Crawford D.L., Barnes J.V.
- (1969) Astron. J. 74, 817
- Four-color and Hbeta photometry of open clusters III. Praesepe
- 1969AJ.....74..817C