NGC 251

NGC 251 is a spiral galaxy in the constellation of Pisces. It was discovered on October 15, 1784, by Frederick William Herschel.

NGC 251
SDSS image of NGC 251
Observation data (J2000 epoch)
Constellation	Pisces
Right ascension	00h 47m 54.031s[1]
Declination	+19° 35′ 48.51″[1]
Redshift	0.015184[2]
Heliocentric radial velocity	4552 km/s[2]
Distance	204.36 ± 12.64 Mly (62.657 ± 3.876 Mpc)[2]
Apparent magnitude (B)	14.6[3]
Characteristics
Type	Sc[2]
Size	148,600 ly (45,570 pc)[2][note 1]
Apparent size (V)	2.4′ × 1.9′[2]
Other designations
UGC 490, MGC+03-03-003, PGC 2806[3]

One supernova has been observed in NGC 251: SN 2023rky (type II, mag. 18.6).^[4]