MCDONALD P45A TWO-CHANNEL PHOTOMETER
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  Instrument Overview                                                         
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    The McDonald P45a Two-Channel Photometer has an uncooled RCA 8850         
    photomultiplier as its primary channel, with an uncooled RCA 4516         
    photomultiplier as its secondary channel.  The instrument is described in 
    Binzel and Mulholland (1983).                                             
                                                                              
    Binzel, R.P. and J.D. Mulholland, Photometry of Pluto during the 1982     
    opposition, Astron. J. 88, 222-225, 1983.

References
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Binzel, R.P. and J.D. Mulholland,       
        Photometry of Pluto during the 1982 opposition, Astron. J. 88,        
        222-225, 1983.