Page last updated Dec 26, 2015|
A magnitude 17.5(?) spiral galaxy (type S? pec) in Virgo (RA 13 03 59.5, Dec -11 57 44)
Physical Information: Based on a recessional velocity of 41285 km/sec, a straightforward calculation indicates that PGC 117500 is about 1920 to 1925 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 1640 to 1645 million light years away at the time the light by which we see it was emitted, about 1750 to 1755 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 0.15 by 0.1 arcmin, the galaxy is about 70 to 75 thousand light years across.
Above, a 12 arcmin wide DSS image centered on PGC 117500 (the dot just below its label)
Below, a 0.6 arcmin wide DSS image of the galaxy