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
相关论文
共 61 条
  • [1] [Anonymous], 2004, 35 COSPAR SCI ASSEMB
  • [2] Baer J., 2004, COMET ASTEROID ORBIT
  • [3] Bange J, 1998, ASTRON ASTROPHYS, V340, pL1
  • [4] BANGE JF, 1997, ESA, P169
  • [5] Britt DT., 2002, Asteroids III, P485, DOI [10.2307/j.ctv1v7zdn4.37, DOI 10.2307/J.CTV1V7ZDN4.37]
  • [6] Error statistics of asteroid optical astrometric observations
    Carpino, M
    Milani, A
    Chesley, SR
    [J]. ICARUS, 2003, 166 (02) : 248 - 270
  • [7] CARPINO M, 2004, IAU S, V172, P203
  • [8] PLANETARY CLOSE ENCOUNTERS: GEOMETRY OF APPROACH AND POST-ENCOUNTER ORBITAL PARAMETERS
    Carusi, A.
    Valsechi, G. B.
    Greenberg, R.
    [J]. CELESTIAL MECHANICS & DYNAMICAL ASTRONOMY, 1990, 49 (02) : 111 - 131
  • [9] CHERNETENKO YA, 2002, ESA SP 500, P437
  • [10] CHESLEY SR, 2005, B AM ASTRONOMICAL SO, P524
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