UGC 12158  UGC 12158 or PGC 69533 is an Sb-type barred spiral galaxy located approximately away from Earth in the constellation of Pegasus. Its tight spiral disk spans approximately across, whose scale at heliocentric distance is about 36.9 kiloparsecs per arcmin. It is also often stated to resemble the Milky Way in appearance, which is mostly due to its disk inclination being almost perpendicular to the line of sight. On 15 December 2003, a 19.2v magnitude Type Ia supernova, was recorded on one of the spiral arms near the apparent centre in UGC 12158, and was designated as SN 2004EF. (Blue star within UGC 12158 in Starbox Hubble's Space Telescope image.) It reached 17.5v magnitude on 4 September 2004 before fading from view. Optical spectra was obtained on 7 September 2014 confirming the Type I classification. No progenitor star was found on earlier survey images.