Page last updated Dec 26, 2015|
A magnitude 17(?) galaxy (type pec?) in Indus (RA 21 05 42.8, Dec -45 03 41)
Physical Information: Based on a recessional velocity of 33780 km/sec, a straightforward calculation indicates that PGC 121500 is about 1575 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 1380 to 1385 million light years away at the time the light by which we see it was emitted, about 1455 to 1460 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 120 thousand light years across. The closeup below suggests that the galaxy may have an unusual structure, but quality of the image is too poor to be certain.
Above, a 12 arcmin wide DSS image centered on PGC 121500 (below its label)
Below, a 0.6 arcmin wide DSS image of the galaxy