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NGC 21 je galaksija u zviježđu Andromeda.
| NGC 21 galaksija | |
|---|---|
 | |
| Otkriće | |
| Položaj Epoha J2000.0[1] | |
| Zviježđe | Andromeda |
| Rektascenzija | 00h 10m 46.9s |
| Deklinacija | +33° 21′ 10″ |
| Izgled na našem nebu[1] | |
| Prividna magnituda | 12,9 |
| Prividne dimenzije (V) | 1.6'x0.7' |
| Stvarne osobine objekta | |
| Ostalo | |
| Druge oznake[1] | MCG +05-01-048, CGCG 499.066, PGC 767, UGC 100 |
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