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[ATM] Converting ALT and AZ to RA and DEC

I have programmed my telescope computer to convert RA and DEC to ALT and 
AZ for controlling the axes of my dob telescope. However, when manually 
slewing  the telescope I often find interesting objects that I would 
like to track. What I need now are the reverse equations for RA and DEC 
of the new found object as a function of ALT and AZ derived from the 
encoders.

Can anyone point me an appropriate reference?
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