[AZ-Observing] Friday night

Last night was strange. While a bit on the chilly side, the night 
looked very promising.

 From my backyard on the West side of Phoenix I did some spectroscopy 
around 9 - 10 PM and the sky was very clear, exceptionally.

Then I started UBV photometry. At first the reading were all very 
high indicating a very transparent night. Then they started going 
down significantly. The sky still looked clear. My first thought was 
dew. I have a heater on the scope plus I tried a hair dryer. No luck. 
The reading continued to drop. The best I can figure out is very thin 
clouds moved in.

If you thought your eyes were going bad last night I think it can be 
attributed to a degrading sky. Again, visually I could see no change, 
even through the telescope optics.

Definitely not a photometric night. Tonight may be better.

Happy Holidays.

Jeff
-- 
Jeff Hopkins
HPO SOFT
Counting Photons
http://www.hposoft.com/Astro/astro.html
Hopkins Phoenix Observatory
7812 West Clayton Drive
Phoenix, Arizona 85033-2439 U.S.A.
(623)849-5889
(623) 247-1190 (Fax)
www.hposoft.com
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