[AZ-Observing] Estimating size and brightness
- From: "Steve Coe" <stevecoe@xxxxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Thu, 29 Jan 2004 05:37:11 -0700
Hello all;
I changed the header for this discussion.
I agree that consistency is the key and I have tried to get some here and
have sometimes done well and sometimes failed miserably. I look back at old
notes and wind up with "faint" for an object that last weekend I called
"pretty bright"!!
Like Andrew said, a better night, I am more rested, or more caffeine loaded,
who knows?
So, some of my notes show up like "hey, I really know what I am doing here".
And other times it is like "crying out loud, is that the same object?". Ya
know, space is like really, really BIG. There are plenty of chances to
screw up.
Matt, the eyepieces are all one element, actually Wm. H. wrote that he
preferred them....how is that for ancient technology at work? So, I think I
remember that the "large 20 foot" gave a field of view of 17 arc minutes at
157X.....I am willing to be corrected on that one. "Large" 20 foot because
it had an 18 inch mirror and he had built a scope with a 20 foot focal
length earlier that had a 12 inch mirror. But, the resolution must have
been pretty good, he split a lot of close doubles with it and saw a lot of
planetary detail. Could not have been too bad. Ya don't need a Barlow with
20 FEET of focal length!!
Clear Skies;
Steve Coe
Author "Deep Sky Observing--The Astronomical Tourist"
Saguaro Astronomy Club website
www.saguaroastro.org
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