NGC 2539
 
NGC 2539 is a open cluster located in the constellation of Puppis. The NGC is a catalog of 7,840 nebulae, star clusters, and galaxies. Here are the key stats on NGC 2539:
| NGC: | NGC 2539 | 
| Type: | open cluster | 
| Constellation: | Puppis | 
| V-mag (visual): | 6.5 | 
| B-mag (blue): | 7.05 | 
| Right Ascension: | 08:10:36.98 | 
| Declination: | -12:49:14.40 | 
| Major axis: | 12.3 ' | 
| Radial velocity: | 29 km/s | 
| Redshift: | 0.000098 | 
Right Ascension (RA) units = HH:MM:SS.SS
Declination (Dec) units = DD:MM:SS.SS