Astronomy:NGC 4617

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NGC 4617
NGC 4617 imaged by SDSS
Observation data (J2000 epoch)
ConstellationCanes Venatici
Right ascension 12h 41m 05.8961s[1]
Declination+50° 23′ 36.233″[1]
Redshift0.015506±0.00000634[1]
Helio 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[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

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

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 "Results for object NGC 4617". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=NGC+4617. 
  2. ↑ "Distance Results for NGC 4617". NASA. https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+4617. 
  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. doi:10.1098/rstl.1789.0021. Bibcode: 1789RSPT...79..212H. 
  4. ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 4617". https://cseligman.com/text/atlas/ngc46.htm#4617. 
  5. ↑ "NGC 4617". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+4617. 
  6. ↑ Nakano, S.; Itagaki, Koichi (6 February 2005). "Supernova 2005ab in NGC 4617". International Astronomical Union Circular 8478: 1. Bibcode: 2005IAUC.8478....1N. http://www.cbat.eps.harvard.edu/iauc/08400/08478.html#Item1. 
  7. ↑ "SN 2005ab". IAU. https://www.wis-tns.org/object/2005ab. 
  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. http://www.cbat.eps.harvard.edu/cbet/001100/CBET001175.txt. 
  9. ↑ "SN 2007ss". IAU. https://www.wis-tns.org/object/2007ss. 

Coordinates: Sky map 12h 41m 05.8961s, +50° 23′ 36.233″



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