Mathematics – Logic
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984phdt.........5v&link_type=abstract
Ph.D. Thesis Arizona Univ., Tucson.
Mathematics
Logic
Asteroids, Charge Coupled Devices, Solar System, Spectrophotometry, Data Acquisition, Imaging Techniques, Protoplanets, Reflectance
Scientific paper
Narrowband spectrophotometric observations of outer solar system (semi-major axis greater than 3.2 AU) asteroids have been used to investigate the surface compositions of the D- and P-class asteroids in an effort to learn about their origins and formation conditions. Spectra of 20 outer solar system asteroids and 2 main-belt D-class asteroids were obtained using two charge-coupled device (CCD) spectrographs. No mineralogical absorption features were evident. The spectra can be divided into four groups based upon four discrete slopes among the spectra. The slope increases (reddens) with increasing heliocentric distance. All of the asteroids observed are locked in orbits driven by Jupiter's gravitational attraction. The distinct slope changes suggest that these asteroids are the remnants of a gradation in composition of planetesimals in the outer solar system, which were selectively retained in location when other material was lost. Three possible compositions based upon organic polymer materials are discussed.
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