Page last updated Dec 26, 2015|
A magnitude 16.5(?) spiral galaxy (type Sa?) in Libra (RA 14 57 48.1, Dec -03 05 03)
Physical Information: Based on a recessional velocity of 17160 km/sec, a straightforward calculation indicates that PGC 120500 is about 800 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 745 to 750 million light years away at the time the light by which we see it was emitted, about 765 to 770 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 0.35 by 0.2 arcmin, the galaxy is about 75 thousand light years across.
Above, a 12 arcmin wide SDSS image centered on PGC 120500 (to the left of its label)
Below, a 0.6 arcmin wide SDSS image of the galaxy