A satellite-asteroid mystery and a possible early flux of scattered C-class asteroids |
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| Institution: | 1. Planetary Exploration Research Center, Chiba Institute of Technology, 2-17-1, Narashino, Tsudanuma, Chiba 275-0016, Japan;2. Earth–Life Science Institute, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan;3. Department of Applied Life Sciences, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, 1432-1, Horinouchi, Hachioji, Tokyo 192-0392, Japan;4. The University Museum, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;5. Department of Systems Innovation, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;6. Aeronautical Technology Directorate, Japan Aerospace Exploration Agency, 7-44-1, Jindaijihigasi-machi, Chofu, Tokyo 182-8522, Japan;7. Institute of Space and Astronomical Science, Japan Aerospace Exploration Agency, 3-1-1, Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan |
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| Abstract: | Spectrophotometric measurements of the subset of satellites thought to be of capture origin, orbiting Saturn, Jupiter, and Mars, indicate that they typically (all?) have neutral spectra and low albedo, indicating spectral class C. This finding is puzzling in light of evidence that class-C objects are native only to the outer half of the asteroid belt. How did C-like objects approach, and get captured by, planets? Probably Jupiter resonances scattered a high flux of C-type objects out of the belt and throughout much of the primordial solar system. Such scattering could occur only at the close of planet accretion when extended atmospheres could affect capture. The largest flux of scattered objects came from resonances in the most heavily populated regions of the belt near 2.8 AU: in particular, the 7:3 and 5:2 resonance regions primarily populated by C's. Hence, most captured satellites are C's, not D's, S's, etc. This scenario supports and expands upon the capture scenario involving extended protoatmospheres, proposed by J. B. Pollack, J. Burns, and M. Tauper (1979, Icarus 37, 587–611) and D. Hunten (1979, Icarus 37,113–123). |
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