## Re: Red Shift - Cosmological or Doppler or both?

Originally Posted by

**i555i666wHeretic** For example, quasar receding with V=c/2 would have:

z~ V/c (approximation - valid for "small" V) ~ 0.5 (here it is probably more correct refer to "recessional velocity"?).

So they are approximately of the same magnitude - ?

No. V = c/2 would not be considered a "small" velocity.

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__DSO AP:__

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Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,LRGB filters; KWIQ/QHY5 guide

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; __Planetary AP:__ Celestron C-11; ZWO ASI120MC; __Portable:__ Celestron C-8 on

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pro; C-90 on wedge; 20x80 binos; __Etc:__ Canon 350D; Various EPs, etc. __Obs:__ 8' Exploradome;

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(pier);

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