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Physical characteristics of Hayabusa target Asteroid 25143 Itokawa |
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| Authors: | SM Lederer DL Domingue M Abe KS Jarvis Y Ohba LM French S Hasegawa SM Larson |
| Institution: | a Planetary Astronomy Group, 2101 NASA Road 1, MC SR, NASA Johnson Space Center, Houston, TX 77058, USA b Johns Hopkins University/Applied Physics Laboratory, 11100 Johns Hopkins Rd., Laurel, MD 20723, USA c Japanese Aerospace Exploration Agency/Institute of Space and Astronautical Science, 3-1-1, Yoshinodai, Sagamihara, Kanagawa, 229-8510, Japan d Department of Astronomy, University of Maryland, College Park, MD 20742, USA e Lockheed-Martin Space Operations, 2400 NASA Rd. 1, C-23, Houston, TX 77058, USA f Earth and Space Sciences Division, Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, USA g Department of Physics, Illinois Wesleyan University, PO Box 2900, Bloomington, IL 61701, USA h Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA i Toho Gakuen University, 3-11 Heiwagaoka, Meito-ku, Nagoya, 465-8515, Japan |
| Abstract: | In March 2001, the Hayabusa spacecraft target, Asteroid 25143 Itokawa, made its final close approach to Earth prior to the spacecraft's launch. We carried out an extensive observing campaign from January to September 2001 to better characterize this near-Earth asteroid. Global physical properties of the surface of Itokawa were characterized by analyzing its photometric properties and behavior. Results included here capitalize on analysis of broadband photometric observations taken with a number of telescopes, instruments, and observers. We employed a Hapke model to estimate the surface roughness, single particle scattering albedo, single particle scattering characteristics, phase integral, and geometric and bond albedo. We find that this asteroid has a higher geometric albedo than average main belt S-class asteroids; this is consistent with results from other observers. The broadband colors of Itokawa further support evidence that this is an atypical S-class asteroid. Broadband colors show spectral characteristics more typically found on large-diameter main-belt asteroids believed to be space-weathered, suggesting the surface of this small diameter, near-Earth asteroid could likewise be space-weathered. |
| Keywords: | Surfaces asteroids Asteroids Photometry Regoliths Asteroids composition |
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