FreeLists / az-observing / [AZ-Observing] Re: FWHM measurements for Phoenix skies, anyone?

["AJ Crayon" <acrayon@xxxxxxx>]

Matt, this will, probably, generate, quite a bit of discussion.  I haven't 
done anything scientific to answer your question, but I do have quite a bit 
of experience observing from my back yard, near 35th Ave and Thunderbird Rd.

Over the years the closes double that I remember splitting with my 8" 
telescopes is 3".  When I say my 8" telescopes that means the f6 Newtonian 
that I owned for about 20 years.  It also references the new SCT purchased 
around the beginning of this year.  The 3" split was not something that 
could be done on a consistent basis, only if the observing conditions were 
good.

My guess as to why, over 20 years, this kind of observing didn't deteriorate 
is because most of the urban sprawl was north of my position.  Most of my 
observing is to the south or west, the east being right smack dab into 
Aurora Phoenicis.

Any reason for settling on the 2+ arc seeing condition?

Hope this helps,
aj

----- Original Message ----- 
From: "Matt" <mluttinen@xxxxxxxxx>
To: "'AZ-Observing mailing list'" <az-observing@xxxxxxxxxxxxx>
Sent: Sunday, May 20, 2007 8:25 PM
Subject: [AZ-Observing] FWHM measurements for Phoenix skies, anyone?


Hello,

Anyone (crazy enough) out there do enough urban imaging to get a feel for an
average FWHM over Phoenix? Is it usually 2+ arcsec (or worse) or do we
sometimes get below that?

I am about to jump off the imaging cliff and want to know what I am in for.

TYIA,

Matt

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