| UGC 12158 | |
| Epoch: | J2000 |
| Dec: | [1] |
| Constellation Name: | Pegasus |
| Z: | 0.030985[2] |
| H Radial V: | 9,289 km/s |
| Type: | Sb or Sb D |
| Dist Ly: | 384 million ly (117.86 Mpc) |
| Appmag B: | 15.3 |
| Appmag V: | 14.5 |
| Size V: | 1.2' × 1.1' |
| Names: | PGC 69533, UGC 12158, MCG+03-57-032, 2MASX J22421049+1959492, SDSS J224210.53+195948.8, GALEXASC J224210.44+195949.5 |
UGC 12158 or PGC 69533 is an Sb-type barred spiral galaxy located approximately 384000000abbr=onNaNabbr=on away from Earth in the constellation of Pegasus. Its tight spiral disk spans approximately 140000abbr=onNaNabbr=on, whose scale at heliocentric distance is about 36.9 kiloparsecs per arcminute.[2] It is also often stated to resemble the Milky Way in appearance, with a similar central bar and spiral arm structure.[3]
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.[4] (Blue star within UGC 12158 in Starbox Hubble's Space Telescope image.[5]) It reached 17.5v magnitude on 4 September 2004 before fading from view.[6] Optical spectra was obtained on 7 September 2004 confirming the Type I classification.[7] No progenitor star was found on earlier survey images.