Celestial Mechanics and Dynamical Astronomy

, Volume 100, Issue 1, pp 27–42

Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris

Open Access
Original Article

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.

Keywords

N-body Asteroid Ephemerides Asteroid masses Astrometric masses Asteroid porosity 

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  1. 1.South UniversityPittsburghUSA
  2. 2.Jet Propulsion LaboratoryPasadenaUSA

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