Trumpler 21
Number of stars per data source
Reference 274 : 361 stars
References
- 274
- Giorgi E.E., Baume G., Vazquez R.A., Feinstein A.
- (2001) Rev. Mex. Astron. Astrofis. 37, 15
- CCD UBVI photometry and polarimetry in the open cluster Trumpler 21
- 2001RMxAA..37...15G