Optical Conditions

["Tom Droege" <droege@snapmail.us>]

I have been looking at some strange results.  Threre seem to be conditions
where the atmosphere is opaque to the V band and quite transparent to the
I band.  This results in wildly varying detection ratios.  This seems to
take place over a relatively short period of time, and is most aparent for
the tom1 telescope which is looking through the most atmosphere.

An example, looking at +20:

Late evening image   2893 V detections
                    10953 I detections
Just before dawn      260 V detections
                    16826 I detections

On other occations, I have seen V and I detections to be similar.

Any expert willing to comment?

Tom Droege