UGC 4904 explained

UGC 4904
Epoch:	J2000
Constellation Name:	Lynx
Dist Ly:	NaNMpc
Z:	0.005571
H Radial V:	1665^[1]
Type:	SABdm^[2]
Size:	~9.58kpc (estimated)
Appmag B:	15.0^[3]
Notes:	Dwarf spiral galaxy with a supernova impostor which eventually exploded as an actual supernova

UGC 4904 is a barred spiral galaxy in the constellation Lynx. Its velocity with respect to the cosmic microwave background is 1880 ± 15km/s, which corresponds to a Hubble distance of NaNMpc. 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 (typeIbn, mag. 13.8)^[6] on October 11, 2006.^[7]

Close galaxy pairs in low and medium density regions: The southern sky. Nordgren, Tyler E.. Chengalur, Jayaram N.. Salpeter, E. E.. Terzian, Yervant . Yervant Terzian . Astronomical Journal. 114. 913–931. 1997. 10.1086/118523. 1997AJ....114..913N. free.
A Catalog of Visually Classified Galaxies in the Local (z ∼ 0.01) Universe. Ann, H. B.. Seo, Mira. Ha, D. K.. The Astrophysical Journal Supplement Series. 217. 2. 27–49. 2015. 2015ApJS..217...27A. 10.1088/0067-0049/217/2/27. 1502.03545. 119253507.
Web site: NED results for object UGC 4904 . 29 January 2017 . .
1964MCG...C02....0V . Morphological catalogue of galaxies. Part 2 . Vorontsov-Vel'Yaminov . B. A. . Arkhipova . V. P. . Morphological Catalogue of Galaxies . 1964 . C02 .
Web site: Massive Star Burps, Then Explodes . Univ. of California, at Berkeley . April 4, 2007.
Web site: Transient Name Server . SN2006jc . . 13 November 2024.
Web site: NASA – Supernova Imposter Goes Supernova . NASA.Gov . April 4, 2007.