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]

Notes

1. POSS1 103a-O values used.

References

1. Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W.; Chester, Thomas; Elias, Jonathan H.; Huchra, John P.; Liebert, James W.; Lonsdale, Carol J.; Monet, David G.; Price, Stephan; Seitzer, Patrick; Jarrett, Thomas H.; Kirkpatrick, J. Davy; Gizis, John E.; Howard, Elizabeth V.; Evans, Tracey E.; Fowler, John W.; Fullmer, Linda; Hurt, Robert L.; Light, Robert M.; Kopan, Eugene L.; Marsh, Kenneth A.; McCallon, Howard L.; Tam, Robert; Van Dyk, Schuyler D.; Wheelock, Sherry L. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708. ISSN 0004-6256. S2CID 18913331.
2. "NED results for object NGC 0251". National Aeronautics and Space Administration / Infrared Processing and Analysis Center. Retrieved 5 May 2017.
3. "NGC 251". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 5 May 2017.
4. Transient Name Server entry for SN 2023rky. Retrieved 7 September 2023.

External links

• Media related to NGC 251 at Wikimedia Commons