NGC 3939
 
NGC 3939 is a duplicate located in the constellation of Draco. The NGC is a catalog of 7,840 nebulae, star clusters, and galaxies. Here are the key stats on NGC 3939:
| NGC: | NGC 3939 | 
| Type: | duplicate | 
| Dupe x-reference: | NGC 3890 | 
| Constellation: | Draco | 
| Right Ascension: | 11:49:19.85 | 
| Declination: | 74:18:07.90 | 
Right Ascension (RA) units = HH:MM:SS.SS
Declination (Dec) units = DD:MM:SS.SS