Photometric Narrowband CCD Imaging of Comets P/Brorsen-Metcalf and Austin (1989c1)

We have obtained simultaneous wide-field CCD images and conventional aperture photometry of Comets P/Brorsen-Metcalf (1989o) and Austin (1989cl). These data allow us to directly test our absolute calibration of the CCD images and our ability to generate full-coma, continuum-subtracted emission band images. Preliminary photometric calibration for a portion of the Brorsen-Metcalf observations yields reduced emission band and continuum fluxes which agree to within about 10% with those from the photoelectric observations, Conventional photometry of Comet Austin shows unusual variations among the production rates of the different species as a function of heliocentric distance.