NGC 1663
Number of stars per data source
Reference 336 : 133 stars
References
- 336
- Alksnis A.
- (1958) Trudy Astrofiz. Lab. Riga 7,33
- Determination of size, color indices, and spectral classes of stars in an area centered on R.A.=21h24m, Dec=+58.5deg
- 1958TrRig...7...33A