Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris |
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Authors: | James Baer Steven R Chesley |
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Institution: | (1) South University, 1400 Penn Avenue, Pittsburgh, PA 15222, USA;(2) Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, USA |
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Abstract: | We apply the technique of astrometric mass determination to measure the masses of 21 main-belt asteroids; the masses of 9
Metis (1.03 ± 0.24 × 10-11 M⊙), 17 Thetis (6.17 ± 0.64 × 10-13 M⊙), 19 Fortuna (5.41 ± 0.76 × 10-12 M⊙), and 189 Phthia (1.87 ± 0.64 × 10-14 M⊙) appear to be new. The resulting bulk porosities of 11 Parthenope (12±4%) and 16 Psyche (46±16%) are smaller than previously-reported
values. Empirical expressions modeling bulk density as a function of mean radius are presented for the C and S taxonomic classes.
To accurately model the forces on these asteroids during the mass determination process, we created an integrated ephemeris
of the 300 large asteroids used in preparing the DE-405 planetary ephemeris; this new BC-405 integrated asteroid ephemeris
also appears useful in other high-accuracy applications. |
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Keywords: | N-body Asteroid Ephemerides Asteroid masses Astrometric masses Asteroid porosity |
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