Physical properties of Asteroid (25143) Itokawa - Target of the Hayabusa sample return mission

Lowry, S.C. and Weissman, P.R. and Hicks, M.D. and Whiteley, R.J. and Larson, S. (2005) Physical properties of Asteroid (25143) Itokawa - Target of the Hayabusa sample return mission. Icarus, 176 (2). pp. 408-417. ISSN 0019-1035. (doi:https://doi.org/10.1016/j.icarus.2005.02.002) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1016/j.icarus.2005.02.002

Abstract

We present results of a ground-based observational study of the Hayabusa mission target near-Earth Asteroid (25143) Itokawa. Our data consist of BVRI-filter CCD photometry and low resolution CCD spectroscopy, from which the asteroid's rotation period, axial ratio, broadband colors, and taxonomic classification are derived. Analysis of the R-filter lightcurve data shows a synodic rotation period of 12.12 ± 0.02 h, consistent with results from other observers. We observed a maximum peak-to-peak amplitude of 1.05 magnitudes, which-depending on the taxonomic class assumed when correcting for phase angle effects - Implies a minimum axial ratio of 2.14. The shape of the rotation lightcurves varies considerably between data sets due to the changing viewing geometry. The lightcurve data from this study has been included in the shape model analysis of Kaasalainen et al. (2003 Astron. Astrophys, 405, L29-L32) and the Hapke analysis of Lederer et al. (2005 Icarus 173,153-165). Color variations were also observed, with the interpolated color indices at lightcurve midpoint being: (B-V) = 0.94 ± 0.05, (V-R) = 0.40 ± 0.06, and (V-I) = 0.74 ± 0.07. Our low resolution Palomar spectra from March 2001 covered a wavelength range of 0.3-1.0 microns. We measured a spectral slope of 9.3 ± 0.3%/100 nm between 0.55-0.70 microns and a deep 1-micron absorption (equivalent ECAS color: w - x = -0.111 ± 0.003, v - x = 0.031 ± 0.003). Comparison of our spectra with published ECAS data from Zellner et al. (1985 Icarus 61, 355-416) indicates that this object is most likely of Q- or S-type, similar to ordinary chondrite meteorites. Our data are more consistent with a Q-type body when both the spectroscopic data and the available BVRI photometry are taken into account. © 2005 Elsevier Inc. All rights reserved.

Item Type: Article
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - Icarus [Field not mapped to EPrints] AD - Queen's University, APS Division, Department of Physics and Astronomy, Belfast BT7 1NN, United Kingdom [Field not mapped to EPrints] AD - Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, United States [Field not mapped to EPrints] AD - Lunar and Planetary Laboratory, University of Arizona, 1626 East University Boulevard, Tucson, AZ 85721, United States [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Hayabusa, Near-Earth asteroids, Photometry, Spectroscopy
Subjects: Q Science > QB Astronomy
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Stephen Lowry
Date Deposited: 08 Dec 2015 23:06 UTC
Last Modified: 18 Dec 2015 16:39 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/52315 (The current URI for this page, for reference purposes)
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