Characterizing Small Bodies From Imaging Data

Details Characterizing Small Bodies From Imaging Data Characterizing Small Bodies From Imaging Data

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.g52b..03g&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #G52B-03

Physics

1221 Lunar And Planetary Geodesy And Gravity (5417, 5450, 5714, 5744, 6019, 6055 Surfaces, 6205 Asteroids

Scientific paper

Detailed global and local digital topographies of small bodies are being constructed from ensembles of overlapping landmark maps (L-maps) which completely cover the surface. Each L-map is a digital representation of a piece of the surface constructed from imaging data with stereophotoclinometry. Multiple images projected onto the L-map provide brightness values at each pixel which are used in a least-squares estimation for slope and relative albedo. The slopes are then integrated, controlled by a sparse set of constraining heights from external sources such as overlapping L-maps, limbs, or laser ranging, to produce the topography solution. The central pixel of each L-map represents a control point, and the ensemble of these points is used in an estimation for their body-fixed locations, the rotational state of the body, and the position and attitude of the spacecraft. Residuals between the observed spacecraft dynamics and predictions from the gravitational field of a homogeneous body with a shape determined from the global topography can be used to constrain the actual internal mass distribution. Eros, currently tiled with over 7000 L-maps representing over seventy million surface vectors determined to about 2 meters, has Bouguer anomalies consistent with a homogeneous mass distrbution. Itokawa, tiled with about 800 L-maps representing eight million vectors determined to 15 centimeters, also shows no evidence for significant inhomogeneity. In particular, the small residuals between measured and predicted LIDAR ranges as Itokawa rotates indicates a center-of-mass to center-of-figure offset of less than a meter in the x-y plane.

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