[Aavso-photometry] average vs. median

[Radu Corlan]

> where are you located, Ben?
> Remember, cosmic rays come from all directions, so you would have
> to totally encase the CCD in order to prevent them.  Even common
> things like concrete and UBK7 glass give off radiation that is
> easily detected by CCD cameras.  An interesting email:
> http://www.ctio.noao.edu/pipermail/ccd-world/2001/000474.html
> 
> The amount of deposited energy changes too.  Some are point sources
> and bright, some are nearly parallel to the front surface.
> 
> Fun things to study if you were a high-energy physicist.  To me,
> cosmic rays are "vermin."

vermin indeed ;-). i had one that created a hot pixel on my camera that 
had a dark current large enough to leave a trail while the sensor was 
read. The good people at Kodak said that a cosmic ray is the most likely 
culprit, but residual radiation from glass (especially colored glass 
which contains heavy elements) could also do it. 

fortunately, after leaving the camera in the trunk of the car one summer 
the crystal annealed itself and the hot pixel is (almost) gone ;-).

Radu

> Arne
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-- 
Radu Corlan      

You pay now, or you pay later, but you always pay the entropy tax.