HR: 1340h
AN: G43A-0804    [Abstracts]
TI: Topography and Gravity of 433 Eros from DSN Doppler Tracking and Altimeter Crossovers
AU: * Torrence, M
EM: Mark\_Torrence\@raytheon.com
AF: Raytheon ITSS, 1616 McCormick Drive, Upper Marlboro, MD 20774 United States
AU: Dunn, P
EM: Peter\_Dunn\@raytheon.com
AF: Raytheon ITSS, 1616 McCormick Drive, Upper Marlboro, MD 20774 United States
AB: We have used the X-band Doppler tracking of NEAR/Shoemaker spacecraft from Earth, and NEAR Laser Rangefinder (NLR) measurements to estimate the orbital state of NEAR-Shoemaker and measurement biases, as well as spherical harmonic coefficients for the gravity field and the shape of 433 Eros. Data from the 200 km. altitude orbital stage through the high inclination 35 km orbits have been used in this analysis. Crossover measurements from NLR observations have been extended to include off-nadir observations. Meter level orbital accuracy for NEAR/Shoemaker with respect to the asteroid center of mass are attainable when the NLR observations are included in the analyses, and the orbital accuracy is improved through the use of NLR crossover information. The long wavelength gravity features have been determined to fractions of a few percent of their value. The spherical harmonic model for the shape of 433 Eros has a precision of a few meters.
DE: 5417 Gravitational fields (1227)
DE: 6019 Gravitational fields
DE: 6055 Surfaces and interiors
DE: 1227 Planetary geodesy and gravity (5420, 5714, 6019)
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting