Bruce Jensen said:
>My recollection was that for an 8" it's about 13.5, and for an 18" it's
>about 16. A ten is probably about 14.
After a bit of searching, I found references that said mag 14.5 - for
stellar objects. Looking over some galaxy fields I was observing I see I
had to be in the mid-14's. So, it raised the question, mag 14.5 under
*what* conditions. I assume the mag 14.5 is for perfect conditions, which
are generally defined as naked eye mag 6.0, right? So, if I had better
than naked eye 6.0, the limiting mag through my eyepiece can exceed 14.5,
correct? Here is a rather interesting page I just found that for me, not
knowing all the variables to plug in, resulted in a limiting mag in my 10"
scope at 120X of 16.11 at zenith:
http://www.go.ednet.ns.ca/~larry/astro/maglimit.html
I did this calculation because at mag 14, The Sky was not showing nearly
the number of galaxies around NGC3269 as I counted.
Mark
Received on Tue Mar 22 14:49:41 2005