NGC 1645
 
NGC 1645 is a lenticular galaxy located in the constellation of Eridanus. The NGC is a catalog of 7,840 nebulae, star clusters, and galaxies. Here are the key stats on NGC 1645:
| NGC: | NGC 1645 | 
| Type: | galaxy | 
| Galaxy type: | lenticular | 
| Galaxy morph class: | S0-a | 
| Constellation: | Eridanus | 
| Surface brightness: | 24.4 mag/arcsec2 | 
| B-mag (blue): | 14 | 
| J-mag (IR): | 10.6 | 
| H-mag (IR): | |
| K-mag (IR): | 9.88 | 
| Right Ascension: | 04:44:06.38 | 
| Declination: | -05:27:56.20 | 
| Major axis: | 2.18 ' | 
| Minor axis: | 0.83 ' | 
| Angle (major axis): | 89° | 
| Radial velocity: | 4780 km/s | 
| Redshift: | 0.016072 | 
Right Ascension (RA) units = HH:MM:SS.SS
Declination (Dec) units = DD:MM:SS.SS