Shape and Topography of Asteroid 25143 Itokawa

Details Shape and Topography of Asteroid 25143 Itokawa Shape and Topography of Asteroid 25143 Itokawa

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.5901g&link_type=abstract

American Astronomical Society, DPS meeting #38, #59.01; Bulletin of the American Astronomical Society, Vol. 38, p.592

Astronomy and Astrophysics

Astronomy

1

Scientific paper

A set of 800 high-resolution topographic maps tiling the surface asteroid Itokawa has been constructed from the Hayabusa AMICA imaging data. Each map is 99x99 pixels, so altogether they represent almost eight million surface vectors. The maps can be used to construct larger high-resolution topographic maps, as well as a global topography models (GTMs) of various sizes, from 6146 vectors to 1.57 million, depending on the intended application. The Itokawa GTM was used to determine its volume, .0178 ± 0.0001 km3, its inertia tensor per unit mass and its surface gravity, assuming a homogeneous mass distribution. The landmark locations were determined in a simultaneous estimation with the pole and the spacecraft position and orientation. The pole, in J2000 earth equatorial coordinates, was at RA=90.026°, Dec=-67.027° with an uncertainty of 0.005°. The RMS post fit residuals of the landmark locations were 16 cm, and the uncertainty of the spacecraft position was 1.5 m at the home position, 7 km from the asteroid. The landmarks were also used to determine spacecraft positions from wide-angle navigation images during the November 12, 2005 approach to Itokawa. A trajectory fit to these positions determined the mass to be 3.54 x 1010 kg, giving a average density of about 2.0 gm/cm3.

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