Spectrophotometry of J8, J9, and four Trojan asteroids from 0.32 to 1.05 μm |
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Authors: | Dale W Smith Paul E Johnson Richard W Shorthill |
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Institution: | Department of Astronomy, University of Washington, Seattle, Washington 98195, USA;Jet Propulsion Laboratory, Pasadena, California 91103, USA;Geospace Sciences Laboratory, University of Utah Research Institute, 420 Chipeta Way, Suite 160, Salt Lake City, Utah 84108, USA |
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Abstract: | New 30-channel narrowband photometry from 0.32 to 1.05 μm of the retrograde Jovian satellites J9 (to 0.7 μm) and J8 and the trailing Trojan asteroids 617, 884, 1172, and 1173 is presented. The data confirm previous measurements of J8, 617, 884, and 1172 at λ < 0.8 μm, but the extension into the infrared shows that the normalized spectral reflectance of these objects rises steadily from ~0.8 at 0.4 μm to ~ 1.4 at 1.05 μm, suggesting they are too bright in the near infrared to be C-type asteroids. The C classification of 1173 is confirmed. J9 is markedly redder than J8 at visible wavelengths. The results indicate a greater taxonomic contrast between these distant objects and main-belt asteroids than previously thought. |
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