NGC 21
NGC 21 is a spiral galaxy located in the constellation Andromeda. Some key stats include:
| NGC: | NGC 21 |
| Type: | galaxy |
| Duplicate cross-reference: | NGC 29 |
| Galaxy type: | spiral |
| Galaxy morph class: | Sbc |
| Constellation: | Andromeda |
| Surface brightness: | 22.2 mag/arcsec2 |
| B-magnitude (blue): | 13.4 |
| J-magnitude (IR): | 11.2 |
| H-magnitude (IR): | |
| K-magnitude (IR): | 10.6 |
| Right Ascension: | 00:10:46.90 |
| Declination: | 33:21:10.20 |
| Major axis: | 1.38 ' |
| Minor axis: | 0.63 ' |
| Angle (major axis): | 150° |
| Radial velocity: | 4700 km/s |
| Redshift: | 0.015801 |
Right Ascension units = HH:MM:SS.SS
Declination units = DD:MM:SS.SS
PN = planetary nebula