NGC 840
 
NGC 840 is a spiral galaxy located in the constellation of Cetus. The NGC is a catalog of 7,840 nebulae, star clusters, and galaxies. Here are the key stats on NGC 840:
| NGC: | NGC 840 | 
| Type: | galaxy | 
| Galaxy type: | spiral | 
| Galaxy morph class: | Sb | 
| Constellation: | Cetus | 
| Surface brightness: | 23.6 mag/arcsec2 | 
| V-mag (visual): | 13.4 | 
| B-mag (blue): | 14.3 | 
| J-mag (IR): | 11.3 | 
| H-mag (IR): | |
| K-mag (IR): | 10.5 | 
| Right Ascension: | 02:10:16.21 | 
| Declination: | 07:50:43.10 | 
| Major axis: | 1.74 ' | 
| Minor axis: | 0.78 ' | 
| Angle (major axis): | 77° | 
| Radial velocity: | 7151 km/s | 
| Redshift: | 0.024143 | 
Right Ascension (RA) units = HH:MM:SS.SS
Declination (Dec) units = DD:MM:SS.SS