Photometry of Phoebe |
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| Affiliation: | 1. Planetary Exploration Research Center, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, 275-0016, Japan;2. Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, D-37077 Göttingen, Germany;3. Graduate School of Science, Osaka University, 1-1 Kaneyama-cho, Toyonaka, 560-0043, Japan;4. Graduate School of Science, Kobe University, 1-1 Rokodai-cho, Nada-ku, Kobe, 657-8501, Japan;1. Department of Spinal Surgery, Tawam Hospital in affiliation with Johns Hopkins Medical, Al Ain, United Arab Emirates;2. Department of Orthopaedic Surgery, St. Vincent''s University Hospital, Dublin, Ireland;1. Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX 77204-5007, United States;2. Department of Geosciences, University of Arkansas, Fayetteville, AR 72701, United States;3. Department of Earth and Planetary Sciences, Washington University, St. Louis, MO 63130, United States;4. Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195, United States;1. Section of Oral Radiology, Department of Dentistry and Oral Health, Aarhus University, Aarhus C, Denmark;2. Colosseumklinikken, Copenhagen, Denmark |
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| Abstract: | Observatios of Phoebe (S9) in the V filter at small solar phase angles (0.2° to 1.2°) with the MIT SNAPSHOT CCD are presented. The value of Phoebe's sideral rotational period is refined to 9.282 ± 0.015hr. Assuming the Voyager-derived 110 km radius, Phoebe's observed mean opposition V magnitude of 16.176 ± 0.033 (extrapolated from small angles) corresponds to a geometric albedo of 0.084 ± 0.003. A strong opposition effect is indicated by the 0.180 ± 0.035 mag/deg solar phase coefficient observed at these small phase angles. The data are shown to be compatible with a phase function for C-type asteroids (K. Lumme and E. Bowell, 1981, Astron. J. 86, 1705–1721; K. Lumme, E. Bowell, and A. W. Harris, 1984, Bull. Amer. Astron. Soc. 16, 684), but give a poorer fit to the average asteroid phase relation of T. Gehrels and E.F. Tedesco (1979, Astron. J. 84, 1079–1087). Phoebe's rotational lightcurve in the V filter is roughly sinusoidal, with a 0.230-mag peak-to-peak amplitude and weaker higher order harmonics indicating primarily bimodal surface feature contrast. In addition to these photometric results, precise positions on 3 nights are given. |
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