Page last updated Dec 26, 2015|
A magnitude 18.5(?) galaxy (type S? pec?) in Grus (RA 22 55 46.9, Dec -41 30 24)
Physical Information: Based on a recessional velocity of 48020 km/sec, a straightforward calculation indicates that PGC 123500 is about 2235 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 1860 to 1865 million light years away at the time the light by which we see it was emitted, about 2005 to 2010 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 0.2 by 0.1 arcmin, the galaxy is about 105 to 110 thousand light years across.
Above, a 12 arcmin wide DSS image centered on PGC 123500
Below, a 0.6 arcmin wide DSS image of the galaxy