[AZ-Observing] Re: FWHM measurements for Phoenix skies, anyone?
- From: "Matt" <mluttinen@xxxxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Sun, 20 May 2007 21:17:16 -0700
AJ,
It seems from my research that, for imaging, anything sub 2 arcsec (as
measured during critical automated focusing, I think) is considered very
good to excellent. I wonder how often we get that here with our low
humidity. BUT, turbulence from the giant urban heat island we live in may
offset our "Arizona Skies."
I am planning on doing some patio imaging. It can be done RGB with an LP
filter or by going narrowband (O3, Ha, S2). My choice of scope and camera
may be influenced by the typical local seeing, but I just don't know enough
yet to make an educated decision. The monetary investment is substantial,
so I am trying to figure out as much as possible in advance.
Matt
-----Original Message-----
From: az-observing-bounce@xxxxxxxxxxxxx
[mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of AJ Crayon
Sent: Sunday, May 20, 2007 9:01 PM
To: az-observing@xxxxxxxxxxxxx
Subject: [AZ-Observing] Re: FWHM measurements for Phoenix skies, anyone?
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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