UGC 12158
Barred spiral galaxy UGC 12158
Observation data (J2000 epoch)
Constellation	Pegasus
Right ascension	22h 42m 10.496s[1]
Declination	19° 59′ 49.21″[1]
Redshift	0.030985[2]
Heliocentric radial velocity	9,289 km/s[2]
Distance	384 million ly (117.86 Mpc)[2]
Apparent magnitude (V)	14.5[2]
Apparent magnitude (B)	15.3[2]
Characteristics
Type	Sb or Sb D[2]
Apparent size (V)	1.2' × 1.1'[2]
Other designations
PGC 69533, UGC 12158, MCG+03-57-032, 2MASX J22421049+1959492, SDSS J224210.53+195948.8, GALEXASC J224210.44+195949.5 [2]

UGC 12158 or PGC 69533 is an Sb-type barred spiral galaxy located approximately 384,000,000 ly (118 Mpc) away from Earth in the constellation of Pegasus. Its tight spiral disk spans approximately 140,000 ly (40 kpc), 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]

2003 Supernova

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.^[6]