NGC 3645
 
NGC 3645 is a duplicate located in the constellation of Leo. The NGC is a catalog of 7,840 nebulae, star clusters, and galaxies. Here are the key stats on NGC 3645:
| NGC: | NGC 3645 | 
| Type: | duplicate | 
| Dupe x-reference: | NGC 3630 | 
| Constellation: | Leo | 
| Right Ascension: | 11:20:16.98 | 
| Declination: | 02:57:51.80 | 
Right Ascension (RA) units = HH:MM:SS.SS
Declination (Dec) units = DD:MM:SS.SS