THIS PROPOSAL WILL FUND ANALYSIS OF OPTICAL AND IR SPECTRAL OBSERVATIONS OF COMETS ASTEROIDS AND GIANT PLANETS. THESE BODIES PROVIDE KEY CLUES TO THE PHYSICAL AND CHEMICAL CONDITIONS OF THE PROTOSOLAR DISK DURING PLANET FORMATION. TASK 1: PI A. MCKAY WILL ANALYZE OPTICAL AND IR SPECTRA OF COMETS OBTAINED WITH KECK NIRSPEC IRTF ISHELL KECK HIRES MCDONALD TULL COUDE APO ARCES AND OTHER INSTRUMENTS TO FULLY CHARACTERIZE COMETARY COMPOSITION AND COMA PHOTOCHEMISTRY. TASK 2: PI A. MCKAY WILL SUPPORT ANALYSIS OF SPACEBASED OBSERVATIONS OF THE GIANT PLANETS AND SMALL BODIES.