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NGC 251 is a spiral galaxy in the constellation of Pisces. Its velocity with respect to the cosmic microwave background for is 4,224±23 km/s, which corresponds to a Hubble distance of 203.2 ± 14.3 Mly (62.30 ± 4.37 Mpc).[2] Additionally, six non redshift measurements give a distance of 205.32 ± 5.54 Mly (62.950 ± 1.699 Mpc).[4] It was discovered on October 15, 1784, by German-British astronomer William Herschel.[5]

According to I.D. Karachentsev, NGC 251 forms an isolated galaxy pair with UGC 477.[6]

One supernova has been observed in NGC 251: SN 2023rky (type II, mag. 18.6) was discovered by the Zwicky Transient Facility on 6 September 2023.[7]

Notes

  1. ^ POSS1 103a-O values used.

See also

References

  1. ^ a b 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. ^ a b c d e f g “NED results for object NGC 0251”. National Aeronautics and Space Administration / Infrared Processing and Analysis Center. Retrieved 5 May 2017.
  3. ^ a b “NGC 251”. SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 5 May 2017.
  4. ^ “Distance Results for NGC 251”. NASA/IPAC EXTRAGALACTIC DATABASE. NASA. Retrieved 9 April 2025.
  5. ^ Seligman, Courtney. “New General Catalogue Objects: NGC 251″. Celestial Atlas. Retrieved 9 April 2025.
  6. ^ Karachentsev, I. D. (1972). “Catalogue of isolated pairs of galaxies in the northern hemisphere”. Soobshcheniya Spetsial’noj Astrofizicheskoj Observatorii. 7: 1–92. Bibcode:1972SoSAO…7….1K.
  7. ^ “SN 2023rky”. Transient Name Server. IAU. Retrieved 9 April 2025.
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