UGC 4904

UGC 4904
UGC 4904
	UGC 4904, imaged by the Sloan Digital Sky Survey
Observation data (J2000 epoch)
Constellation	Lynx
Right ascension	09h 17m 22.062s
Declination	+41° 54′ 39.70″
Redshift	0.005571
Heliocentric radial velocity	1665
Distance	90.5 ± 6.4 Mly (27.74 ± 1.96 Mpc)
Apparent magnitude (B)	15.0
Characteristics
Type	SABdm
Size	~31,200 ly (9.58 kpc) (estimated)
Notable features	Dwarf spiral galaxy with a supernova impostor which eventually exploded as an actual supernova
Other designations
	MCG +07-19-054, PGC 26231, CGCG 209-044

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

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]

1 2 3 4 5 6 7 "NED results for object UGC 4904". National Aeronautics and Space Administration / Infrared Processing and Analysis Center. Retrieved 29 January 2017.
1 2 Nordgren, Tyler E.; Chengalur, Jayaram N.; Salpeter, E. E.; Terzian, Yervant (1997). "Close galaxy pairs in low and medium density regions: The southern sky". Astronomical Journal. 114: 913–931. Bibcode:1997AJ....114..913N. doi:10.1086/118523.
↑ 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. arXiv:1502.03545. Bibcode:2015ApJS..217...27A. doi:10.1088/0067-0049/217/2/27. S2CID 119253507.
↑ Vorontsov-Vel'Yaminov, B. A.; Arkhipova, V. P. (1964). "Morphological catalogue of galaxies. Part 2". Morphological Catalogue of Galaxies. C02. Bibcode:1964MCG...C02....0V.
↑ "Massive Star Burps, Then Explodes". Univ. of California, at Berkeley. Retrieved April 4, 2007.
↑ "SN 2006jc". Transient Name Server. IAU. Retrieved 13 November 2024.
↑ "NASA – Supernova Imposter Goes Supernova". NASA.Gov. Retrieved April 4, 2007.