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9969 Braille: Deep Space 1 infrared spectroscopy, geometric albedo, and classification |
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| Authors: | BJ Buratti DT Britt MD Hicks RH Brown RM Nelson TC Owen BR Sandel N Thomas |
| Institution: | a Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr. 183-501, Pasadena, CA 91109, USA b Department of Geological Sciences, University of Tennessee, Knoxville, TN 37996, USA c United States Geological Survey, 2255 North Gemini Dr., Flagstaff, AZ 86001, USA d Southwest Research Institute, 6220 Culebra Rd., San Antonio, TX 78228, USA e Lunar and Planetary Institute, University of Arizona, Tucson, AZ 85721, USA f DLR Institute of Space Sensor Technology and Planetary Exploration, Rutherfordstrasse, 2D-12489 Berlin, Germany g Institute for Astronomy, University of Hawaii, Honolulu, HI 96822, USA h Department of Space Studies, Southwest Research Institute, Boulder, CO 80302, USA i Max-Planck-Institute für Aeronomie, Max-Planck-Strasse 2, 37191 Katlenburg-Lindau, Germany |
| Abstract: | Spectra of Asteroid 9969 Braille in the 1.25-2.6 μm region returned by the Deep Space 1 (DS1) Mission show a ∼10% absorption band centered at 2 μm, and a reflectance peak at 1.6 μm. Analysis of these features suggest that the composition of Braille is roughly equal parts pyroxene and olivine. Its spectrum between 0.4 and 2.5 μm suggests that it is most closely related to the Q taxonomic type of asteroid. The spectrum also closely matches that of the ordinary chondrites, the most common type of terrestrial meteorite. The geometric albedo of Braille is unusually high (pv=0.34), which is also consistent with its placement within the rarer classes of stony asteroids, and which suggests it has a relatively fresh, unweathered surface, perhaps due to a recent collision. |
| Keywords: | Asteroids NEOs 9969 Deep Space 1 |
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