Near-infrared Mapping Of Ceres Surface From Keck

Details Near-infrared Mapping Of Ceres Surface From Keck Near-infrared Mapping Of Ceres Surface From Keck

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.6806c&link_type=abstract

American Astronomical Society, DPS meeting #38, #68.06; Bulletin of the American Astronomical Society, Vol. 38, p.621

Physics

Optics

Scientific paper

Adaptive optics NIRC2 images of asteroid 1 Ceres have been obtained at Keck Observatory on Sep. 22 and 28, 2002 at phase angle of 7deg. and 5deg. respectively. Their optimal spatial resolution was restored using the Mistral deconvolution algorithm [Conan and al., ESO messenger 2000]. Analysis of our set of deconvolved images allowed us to determine the direction of the spin axis (alpha=289+/-5deg, delta=69+/-5deg), which is in agreement with previous study [Thomas et al., Nature 2005], and to produce J/H/K -band high-spatial resolution maps covering 80% of Ceres surface. These first near-infrared maps reveal several albedo features whose intensity variation is of the order of +/-6% with respect to the mean surface albedo. The finest details visible on the surface of Ceres are about 40km wide and the largest surface feature sustains a diameter of about 160km. We will present the results of our analysis, including the multi-color near-infrared maps and their reprojection onto a 3-D model of Ceres.

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