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Mike, great effort, but sorry, you can't do useful magnitude estimates with processed RGB data.
The drill is the usual reduction (dark+bias/flat) of a calibrated BVR or I into the photometry package of your choice.
Mira and MaximCCD both do splendid jobs. Reference star magnitudes can usually be found via an image link with TheSky or similar. With a calibrated image you can then use known values to measure the unknowns.
My guess with a 6" scope and a KAF11002 will deliver around mag 19.5...very hard to go deeper....but not impossible.
P.S.
I have done many asteroid curves using the same chip and a 14.25" scope. Typically 10 minute subs. The data becomes a little useless
below mag 20.
Last edited by Peter Ward; 21-08-2009 at 06:46 PM.
Reason: additional info
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