High Resolution Global Topography of Itokawa From Hayabusa Imaging and LIDAR Data

Details High Resolution Global Topography of Itokawa From Hayabusa Imaging and LIDAR Data High Resolution Global Topography of Itokawa From Hayabusa Imaging and LIDAR Data

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusm.p32a..01g&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #P32A-01

Physics

6055 Surfaces, 6205 Asteroids, 6297 Instruments And Techniques

Scientific paper

The global topography of asteroid Itokawa is represented by an ensemble of about 800 digital landmark maps (L-maps). Slopes found by applying stereo-photoclinometry to multiple AMICA images are integrated, with constraints coming from limbs and overlapping maps, to produce the L-map topography. The center of each L- map is a control point, whose location is determined in an iterative estimation along with the spacecraft location and orientation and Itokawa's rotational pole, with aprioris coming from star-tracker and LIDAR data. The set of L-maps can be used to construct high-resolution composite maps of portions of the surface, or to produce a single high-resolution global topography model (GTM). Assuming a homogeneous mass distribution, the GTM can be used to estimate the inertial and gravitational properties of the asteroid. By fitting a trajectory through the spacecraft positions at the image times, both position and orientation errors can be minimized. The surface locations and ranges of the LIDAR spots along the trajectory produce an independent estimate of the topography, which can then be correlated with topography from the GTM to further constrain the spacecraft's location and improve the overall topography solution.

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