UGC 12158 (PGC 69533) is a barred spiral galaxy in the constellation of Pegasus, located at about 386 million light-years away from Earth. The galaxy is about 216,000 light-years across. Its SIMBAD ID is Z 452-45, an alternative designation for this galaxy.
The galaxy has been photographed by the Hubble Space Telescope, and one famous image shows the trail of a passing asteroid in front of the galaxy. From Earth, it is seen face-on, which makes its central bar and spiral arms easy to study. Because of its shape, it almost look the same as the Milky Way.
In 2004, a supernova explosion was discovered in one of its spiral arms, named SN 2004ef.
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