Re: CCD Clear Sky Detector Sees Clouds

[Tom Droege <tdroege2@earthlink.net>]

I think I will leave the IR telescope biz to others.  Looking at the 4 x 4 
degree square with CW Leo and the 8 squares around it:

.82     .92     .75
.82     1.02    .83
.96     1.17    .93

So if anything there is an anti correlation.  These points were taken last 
night.  Note they are all positive numbers.  For comparison, the detector 
is reading -0.5 right now.  There are clouds.  There were no clouds this 
morning and it read +0.8 in the daylight.

Paul Bartholdi suggests a film cover for my device which might keep down 
wind effects.  I will try it.

Tom Droege

At 11:39 AM 2/8/03 -0700, you wrote:
>Try IRC +10216 (CW Leo) at
>09 47 57.38 +13 16 43.7 J2000
>About as bright as they come in the far IR.
>Look at the IRAS maps to see what the sky looks like at your resolution.
>   As I suggested, such cloud detectors work well with
>certain types of clouds; I bet there is a huge difference
>between cirrus and cumulus for example.  Sounds like you
>have some experimentation to do!
>Arne