How can I find the absolute diameter and distance away of an
For small red shifts, the distance d = z c/H, where z is the red
shift, c is the speed of light, and H is the Hubble constant.
The absolute diamete D is related to the angular diameter A by D
= Ad, where A is in radians. For red shifts greater than about
0.1 See: http://www.astro.ucla.edu/~wright/CosmoCalc.html