Las Campanas-Lowell Observatory Ground-based Observing Campaign: UBVRIJHK Hapke modeling of Hayabusa Spacecraft Target Asteroid 25143 Itokawa.

Details Las Campanas-Lowell Observatory Ground-based Observing Campaign: UBVRIJHK Hapke modeling of Hayabusa Spacecraft Target Asteroid 25143 Itokawa. Las Campanas-Lowell Observatory Ground-based Observing Campaign: UBVRIJHK Hapke modeling of Hayabusa Spacecraft Target Asteroid 25143 Itokawa.

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.5902l&link_type=abstract

American Astronomical Society, DPS meeting #38, #59.02; Bulletin of the American Astronomical Society, Vol. 38, p.593

Astronomy and Astrophysics

Astronomy

Scientific paper

The Japanese spacecraft Hayabusa successfully rendezvoused with Asteroid 25143 Itokawa in the fall of 2005. In 2004, Itokawa, presented its final favorable apparition prior to the spacecraft's arrival at the asteroid. In preparation for this mission, we conducted an extensive ground-based campaign in 2004 and combined these observations with a subset of data from the 2001 apparition to characterize the surface of the asteroid through the application of a Hapke model.
2004 were taken at Lowell and Las Campanas Observatories. We have amassed 29 nights of UBVRI broadband photometry spanning solar phase angles of 4 - 128°, and 9 simultaneous nights of JHK broadband photometry spanning 11 - 70°. These data were combined with the 2001 data (c.f. Lederer et al. Icarus, 173, 153) for which there was enough rotational phase angle coverage to allow for the correction of rotational variations. A Hapke model was then applied to the resultant dataset. The low phase angle data allow us to investigate the backscattering properties while the high phase angle data correspond to the forward scattering regime. Single particle scattering functions calculated were generally forward scattering, suggesting the material on the surface of Itokawa, an S-type asteroid, is not strongly absorbing. This is in contrast to average S-type asteroids. The Bond albedo and phase integrals, which are consistent with unusual regolith, again suggest Itokawa is an atypical asteroid compared with typical, larger S-type asteroids. It is, however, possible that Itokawa is representative of smaller asteroids; further Hapke studies of small asteroids are required to investigate this. All fits for the surface roughness parameter yield a high value, indicative of a blocky surface, which was confirmed by spacecraft images.
This work was made possible in part by a NASA MUCERPI grant, and the NASA Hayabusa Program.

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