Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris

被引：56
作者：
Baer, James [1 ]
Chesley, Steven R. [2 ]
机构：
[1] Univ South, Pittsburgh, PA 15222 USA
[2] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
来源：
CELESTIAL MECHANICS & DYNAMICAL ASTRONOMY | 2008年 / 100卷 / 01期
基金：
美国国家航空航天局;
关键词：
N-body; asteroid; ephemerides; asteroid masses; astrometric masses; asteroid porosity;
D O I：
10.1007/s10569-007-9103-8
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 x 10(-11) M-circle dot), 17 Thetis (6.17 +/- 0.64 x 10(-13) M-circle dot), 19 Fortuna (5.41 +/- 0.76 x 10(-12) M-circle dot), and 189 Phthia (1.87 +/- 0.64 x 10(-14) M-circle dot) 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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页码：27 / 42
页数：16
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