Re: What magnification do I want for deep sky?
- From: AM <sctuser@xxxxxxxxxxx>
- Date: Tue, 28 Feb 2006 08:23:57 -0500
Mike Ruskai wrote:
However, depending on the object, you might reach a point where the
sky is darkened enough to let contrast increase visibility, despite
the object being dimmed as well. Some objects are so small that
you'll need to magnify them to appreciable size anyway, despite the
dimming effect, so getting a higher-mag EP with a wide field will be
useful regardless of how well it works on M31 (which is quite large).
Hi
High surface brightness objects are what he needs
to try and go after under mag 4.5 skies.
From next Wash DC, I get get down to mag 9.5 on
planetary neb., and obliviously far less on extended
objects. But tight globular's, and high SB galaxies
should be by necessity be the targets.
I can see M 87 and several Virgo cluster members
as well. Setting circles, DSC's, or GOTO are
almost mandatory with the lack of starts to star
hop with. I go with polar align, and setting circles.
Here is a link to the Astronomical League's
website which has all kinds of useful info.
http://www.astroleague.org/al/astrnote/astnotes.html
Here is the link to the Urban Club - Deep Sky List.
http://www.astroleague.org/al/obsclubs/urban/urbanld.html
Enjoy :)
--
AM
http://sctuser.home.comcast.net
CentOS 4.2 KDE 3.3
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