The Ellipsoidal Harmonic Expansion of the Gravity Field of Asteroid Eros 433 Estimated From the NEAR Doppler Tracking Data

Details The Ellipsoidal Harmonic Expansion of the Gravity Field of Asteroid Eros 433 Estimated From the NEAR Doppler Tracking Data The Ellipsoidal Harmonic Expansion of the Gravity Field of Asteroid Eros 433 Estimated From the NEAR Doppler Tracking Data

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p32b0551g&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #P32B-0551

Physics

0920 Gravity Methods, 1227 Planetary Geodesy And Gravity (5420, 5714, 6019), 6019 Gravitational Fields, 6205 Asteroids And Meteoroids

Scientific paper

During one year, from Feb. 14, 2000 to Feb. 12, 2001, the NEAR spacecraft (Near Earth Asteroid Rendezvous) orbited Eros, an elongated asteroid with dimensions of 34 km x 16 km x 16 km. Using the NEAR tracking data, we computed an ellipsoidal harmonic expansion up to degree and order 12 for the Eros gravity field. The ellipsoidal harmonic expansion is designed for elongated bodies such as Eros and is more efficient in this case than the standard spherical harmonic expansions. We provide comparison between the results for the Eros gravity field obtained using both the elliptical and spherical harmonic expansions. We analyzed the gravity field of Eros in term of its surface and deep internal structure. While Eros appears to be nearly homogeneous, it has some small density variations as is evident from the "Bouguer gravity" differences between the actual gravity field and one computed from the shape model by assuming a constant density throughout.

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