Astronomy:UGC 4904

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UGC 4904
UGC 4904, imaged by the Sloan Digital Sky Survey
Observation data (J2000 epoch)
ConstellationLynx
Right ascension 09h 17m 22.062s[1]
Declination+41° 54′ 39.70″[1]
Redshift0.005571[2]
Distance90.5 ± 6.4 Mly (27.74 ± 1.96 Mpc)[1]
Apparent magnitude (B)15.0[1]
Characteristics
TypeSABdm[3]
Size~31,200 ly (9.58 kpc) (estimated)[1]
Notable featuresDwarf spiral galaxy with a supernova impostor which eventually exploded as an actual supernova
Other designations
MCG+07-19-054, PGC 26231[1]

UGC 4904 is a barred spiral galaxy in the constellation Lynx. Its velocity with respect to the cosmic microwave background is 1880 ± 15 km/s, which corresponds to a Hubble distance of 90.5 ± 6.4 Mly (27.74 ± 1.96 Mpc).[1] The first known reference to this galaxy comes from Part 2 of the Morphological Catalogue of Galaxies, published in 1964, where it is listed as MCG +07-19-054.[4]

Supernova

Swift Ultraviolet/Optical Telescope image of SN 2006jc

On October 20, 2004, a supernova impostor was observed by Japanese amateur astronomer Kōichi Itagaki within the galaxy. This same star may have transitioned from a luminous blue variable star to a Wolf–Rayet star[5] shortly before it was observed as blowing up as supernova SN 2006jc (type Ibn, mag. 13.8)[6] on October 11, 2006.[7]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "NED results for object UGC 4904". National Aeronautics and Space Administration / Infrared Processing and Analysis Center. https://ned.ipac.caltech.edu/byname?objname=UGC+4904. Retrieved 29 January 2017. 
  2. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Nordgren
  3. ↑ Ann, H. B.; Seo, Mira; Ha, D. K. (2015). "A Catalog of Visually Classified Galaxies in the Local (z ∼ 0.01) Universe". The Astrophysical Journal Supplement Series 217 (2): 27–49. doi:10.1088/0067-0049/217/2/27. Bibcode: 2015ApJS..217...27A. 
  4. ↑ Vorontsov-Vel'Yaminov, B. A.; Arkhipova, V. P. (1964). "Morphological catalogue of galaxies. Part 2". Morphological Catalogue of Galaxies C02. Bibcode: 1964MCG...C02....0V. 
  5. ↑ "Massive Star Burps, Then Explodes". Univ. of California, at Berkeley. http://chandra.harvard.edu/press/07_releases/press_040407.html. Retrieved April 4, 2007. 
  6. ↑ "SN 2006jc". IAU. https://www.wis-tns.org/object/2006jc. 
  7. ↑ "NASA – Supernova Imposter Goes Supernova". NASA.Gov. http://www.nasa.gov/centers/goddard/news/topstory/2007/supernova_imposter.html. Retrieved April 4, 2007. 



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