Page last updated Dec 26, 2015|
A magnitude 17(?) spiral galaxy (type Sab?) in Caelum (RA 04 33 20.5, Dec -44 45 20)
Physical Information: Based on a recessional velocity of 37310 km/sec, a straightforward calculation indicates that PGC 125500 is about 1735 to 1740 million light years away. However, for objects at such distances we should take into account the expansion of the Universe during the time it took their light to reach us. Doing that shows that the galaxy was about 1505 million light years away at the time the light by which we see it was emitted, about 1595 to 1600 million years ago (the difference between the two numbers being due to the expansion of the intervening space during the light-travel time). Given that and its apparent size of about 0.3 by 0.2 arcmin, the galaxy is about 130 thousand light years across.
Above, a 12 arcmin wide DSS image centered on PGC 125500
Below, a 0.6 arcmin wide DSS image of the galaxy