Asteroid 2 Pallas Physical Properties from Near-Infrared High-Angular Resolution Observations

Details Asteroid 2 Pallas Physical Properties from Near-Infrared High-Angular Resolution Observations Asteroid 2 Pallas Physical Properties from Near-Infrared High-Angular Resolution Observations

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.3008c&link_type=abstract

American Astronomical Society, DPS meeting #39, #30.08; Bulletin of the American Astronomical Society, Vol. 39, p.470

Physics

Optics

Scientific paper

We imaged Pallas at high-angular resolution in the J, H and K near-infrared bands using adaptive-optics-equipped cameras at the Keck II and ESO VLT observatories during its 2003 and 2005 oppositions (angular diameter of 0.44 and 0.57 arcsec respectively).
The J-, H- and K-band theoretical resolution element of 28, 37 and 45 km respectively on Pallas' surface were restored by image deconvolution [MISTRAL, Conan et al., 2000]. The very high spatial resolution of the images ( 10 resolution elements across the diameter in K) allowed us to extract the edge contour of the asteroid from the individual images using a wavelet analysis and to model its size (276 x 256 x 248 km, +/- 10 km).
From comparison between our AO-measured edges and previous lightcurve inversion results [Torppa et al., 2003], we were able to refine Pallas' shape model as well as the solution for its spin vector coordinates (Ecliptic J2000.0 lambda=34 +/- 5 deg. and beta=-11 +/- 5 deg.).
We will present the results of our analysis, including the first near-infrared maps of Pallas revealing albedo variations of 4 percent across its surface.

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