Asteroid radar astrometry
Asteroid radar astrometry
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小行星雷达天体测量
DOI：
10.1086/115975
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
R. Velez
中科院分区：
文献类型：
--
作者：
S. Ostro;R. Jurgens;K. Rosema;R. Winkler;D. Yeomans;D. Campbell;J. Chandler;I. Shapiro;A. A. Hine;R. Velez
本文报告了1980 - 1990年期间在阿雷西博和戈德斯通获得的小行星雷达回波的时间延迟和多普勒频率测量结果。介绍了23颗近地小行星和3颗主带小行星的雷达天体测量。这些测量与光学角位置测量正交，并且通常具有10的-5次方和10的-8次方之间的分数精度，允许显著改进轨道的估计，从而改进预测星历的精度。还报告了对1980 - 1990年期间通过天体测量观测到的所有小行星的雷达截面和圆偏振比的估计。
Measurements of time delay and Doppler frequency are reported for asteroid-radar echoes obtained at Arecibo and Goldstone during 1980-1990. Radar astrometry is presented for 23 near-earth asteroids and three mainbelt asteroids. These measurements, which are orthogonal to optical, angular-position measurements, and typically have a fractional precision between 10 to the -5th and 10 to the -8th, permit significant improvement in estimates of orbits and hence in the accuracy of prediction ephemerides. Estimates are also reported of radar cross-section and circular polarization ratio for all asteroids observed astrometrically during 1980-1990.