[Aavso-photometry] UBV Photon Counting

[Arne Henden]

SITe/Tektronix thinned, backside illuminated science CCD.
The Marconi/E2V chips have similar response.  I've been
testing some of the newer CCDs, such as the SXV-H9, ST-7XME and
Meade DSI, and find they have U response, probably adequate
for brighter targets.  "Dead" is in the eyes of the beholder.
You might think a PEP system has more U response, but in
terms of absolute quantum efficiency, many CCDs come pretty
close.  More on that in the future.
Arne

Jeff Hopkins wrote:
> Hello Arne,
> 
> I'm curious what CCD detector you use for the U band work. I looked over 
> the specifications and spectral response of several CCDs and they all 
> seem pretty dead in the U band.
>