Photoelectric observations of asteroids 3, 24, 60, 261, and 863
Photoelectric observations of asteroids 3, 24, 60, 261, and 863
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DOI：
10.1016/0019-1035(89)90015-8
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发表时间：
1989
期刊：
影响因子：
3.2
通讯作者：
A. Harris;J. W. Young;E. Bowell;L. J. Martin;R. Millis;M. Poutanen;F. Scaltriti;V. Zappalá;H. Schober;H. Debehogne;K. Zeigler
中科院分区：
文献类型：
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作者：
A. Harris;J. W. Young;E. Bowell;L. J. Martin;R. Millis;M. Poutanen;F. Scaltriti;V. Zappalá;H. Schober;H. Debehogne;K. Zeigler
本文介绍了从1978年到1984年从不同天文台获得的5颗小行星的观测结果。采用傅里叶分析方法推导了复合光曲线。这种解决方法产生的旋转周期值，平均绝对星等在每个晚上的观测，和傅里叶系数定义的形状的复合光曲线，任何程度指定。该方法的一个主要优点是它对所有计算量产生正式的误差估计。推导出的傅里叶系数可以用于研究小行星的形状和极向，并以更正式的方式定义“旋转阶段”，以便将观测结果从一个幽灵连接到另一个幽灵。周期，振幅和相位的关系，报告了四的五颗小行星。朱诺3号、忒弥斯24号和回声60号的光曲线中存在大量振幅的第一谐波，这表明这些小行星可能有明显的表面反照率变化。60回声在不同方向上的平均绝对星等相差0.2等，显示出一种极地扁平的图形。获得了高质量的星等与太阳相位角的数据。3 ~ 21°。这些数据可能是关于暗行星的最佳数据，并为光散射理论提供了一个测试。
Observations of five asteroids, obtained from various observatories from 1978 to 1984, are presented. A Fourier analysis method was used to derive the composite lightcurves. This solution method yields a value for the rotation period, mean absolute magnitudes on each night of observation, and Fourier coefficients defining the shape of the composite lightcurve, to any degree specified. A major advantage of the method is that it yields formal error estimates for all the quantities computed. The Fourier coefficients derived can be used for studies of the shapes and pole orientations of asteroids and to define “rotation phase” in a more formal way, for connecting observations from one apparition to another. Periods, amplitudes, and phase relations are reported for four of the five asteroids. The presence of a substantial amplitude first harmonic in the lightcurves of 3 Juno, 24 Themis, and 60 Echo suggests that these asteroids may have significant surface albedo variegation. 60 Echo exhibits a difference of 0.2 magnitude in its mean absolute magnitude from different aspects, which suggests a somewhat polar-flattened figure. High-quality magnitude vs solar phase angle data were obtained for 24 Themis from 0°.3 to 21°. These data are perhaps the best available of a dark asteroid and provide a test for light-scattering theories.