RE: [APML] Cygnus Nebulosities

["Chris Schur" <cschur@cybertrails.com>]

Chuck, both me an Tom Polakis have seen mag 7.5 skies up on the Rim, and YES
it has a lot to do with your eyes.  Brian Skiff has good eyes too, we have
on occasion observed with him and he can see stars fainter than either of
us.  Not only can you see the California Neb naked eye easy enough, you can
also see its orientation very easily.  NO filters.  The same can be said on
the Lambda Orionis Bubble.  I want to get my CCD up there and measure the
sky brightness and compare with what those on the SBIG list found.

Chris Schur

Astrophotography: http://www.psiaz.com/schur/astro/index.html


-----Original Message-----
From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
Behalf Of Chuck Vaughn
Sent: Saturday, June 08, 2002 7:50 AM
To: astro-photo@seds.org
Subject: Re: [APML] Cygnus Nebulosities


Chris,

> Not for Arizona.  My cabin up on the Rim has mag 7.5 skies visually.

We discussed this in depth some time back and what I got out of it was that
visual limiting magnitude has much to do with the person doing the
observing. I couldn't see mag 7.5 from 10,000 feet in the Sierra Nevada
10 years ago. For me mag 6.5 to 7.0 would be as good as it could possibly
get.

>  I can see the Californian Nebula naked eye on any night up there.

You're the first person I've ever heard say they could do this. This is
impressive since the California Nebula is a very weak OIII emitter.

> What is the limiting magnitude of your skies?

I think the quantitative measurements of sky brightness being compiled by
Mike Cook is a better way to go as opposed to individual estimates
since those as so dependent on the person doing the estimate.

Chuck <aa6g@aa6g.org>


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