Wikipedia

NGC 4617

NGC 4617
NGC 4617 imaged by SDSS
Observation data (J2000 epoch)
ConstellationCanes Venatici
Right ascension12h 41m 05.8961s[1]
Declination+50° 23′ 36.233″[1]
Redshift0.015506±0.00000634[1]
Heliocentric radial velocity4,649±2 km/s[1]
Distance198.96 ± 2.10 Mly (61.000 ± 0.644 Mpc)[1]
Apparent magnitude (V)13.9g[1]
Characteristics
TypeSb[1]
Size~179,400 ly (55.01 kpc) (estimated)[1]
Apparent size (V)2.61′ × 0.62′[1]
Other designations
IRAS F12387+5040, UGC 7847, MCG +09-21-028, PGC 42530, CGCG 270-013[1]

NGC 4617 is a spiral galaxy in the constellation of Canes Venatici. Its velocity with respect to the cosmic microwave background is 4,831±13 km/s, which corresponds to a Hubble distance of 232.4 ± 16.3 Mly (71.25 ± 4.99 Mpc).[1] However, four non-redshift measurements give a closer mean distance of 198.96 ± 2.10 Mly (61.000 ± 0.644 Mpc).[2] It was discovered by German-British astronomer William Herschel on 9 March 1788.[3][4]

NGC 4617 is an active galaxy nucleus candidate, i.e. it has a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars.[5]

Supernovae

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Two supernovae have been observed in NGC 4617:

  • SN 2005ab (Type II, mag. 16.7) was discovered by Japanese astronomer Kōichi Itagaki on 5 February 2005.[6][7]
  • SN 2007ss (Type Ia, mag. 16.6) was discovered by Japanese astronomer Yoshimi Ichimura on 20 December 2007.[8][9]

See also

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References

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  1. ^ a b c d e f g h i j k "Results for object NGC 4617". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 26 August 2025.
  2. ^ "Distance Results for NGC 4617". NASA/IPAC Extragalactic Database. NASA. Retrieved 26 August 2025.
  3. ^ Herschel, William (1789). "Catalogue of a Second Thousand of New Nebulae and Clusters of Stars; with a Few Introductory Remarks on the Construction of the Heavens". Philosophical Transactions of the Royal Society of London. 79: 212–255. Bibcode:1789RSPT...79..212H. doi:10.1098/rstl.1789.0021.
  4. ^ Seligman, Courtney. "New General Catalogue Objects: NGC 4617". Celestial Atlas. Retrieved 26 August 2025.
  5. ^ "NGC 4617". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 26 August 2025.
  6. ^ Nakano, S.; Itagaki, Koichi (6 February 2005). "Supernova 2005ab in NGC 4617". International Astronomical Union Circular. 8478: 1. Bibcode:2005IAUC.8478....1N.
  7. ^ "SN 2005ab". Transient Name Server. IAU. Retrieved 26 August 2025.
  8. ^ Nakano, S.; Ichimura, Y.; Itagaki, K. (21 December 2007). "Supernova 2007ss in NGC 4617". Central Bureau Electronic Telegrams. 1175: 1. Bibcode:2007CBET.1175....1N.
  9. ^ "SN 2007ss". Transient Name Server. IAU. Retrieved 26 August 2025.
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  • Media related to NGC 4617 at Wikimedia Commons
  • NGC 4617 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images