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Photometric and polarimetric observations and model simulations of (216) Kleopatra

机译:(216)Kleopatra的光度和旋光观测及模型模拟

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We performed photometric and polarimetric observations, on November 8 and 9, 1999, of an M-type main belt asteroid, (216) Kleopatra by using the HBS spectropolarimeter installed at Dodaira observatory, National Astronomical Observatory of Japan (NAOJ). Photometric amplitude of lightcurve in the V band was 0.12 mag, and the averaged degree of polarization was -1.01 +/- 0.1%. It seems that the polarimetric data might also show a slight change in the degree of polarization (similar to0.2%) at the second minimum of the photometric lightcurve, but we could not confirm that the feature was real because of the large errors of data. With the assumption that the surface is uniform, we have carried out lightcurve simulations based on shape models by Ostro et al. (2000), Tanga et al. (2001) and Roche binary (Cellino et al., 1985). The results of simulations were compared to the configurations of lightcurves which had been obtained at different 4 geometric positions (1980, 1982, 1987 and 1999). The model by Cellino et al. (1985) reproduced almost all the data points without the 1987 observations within similar to0.05 mag., which is the best result among the 3 models. The model by Tanga et al. (2001) well reproduced the lightcurves, but failed in reproducing the 1982 amplitude (difference Delta(diff) similar to 0.2 mag.). We also confirmed that the model by Ostro et al. (2000) could not explain the observed lightcurves.
机译:我们在1999年11月8日至9日对日本M型主带小行星(216)Kleopatra进行了光度和旋光观测,方法是使用安装在日本国立天文台Dodaira天文台的HBS分光计。 V波段光曲线的光度幅度为0.12 mag,平均偏振度为-1.01 +/- 0.1%。似乎偏振数据在光度曲线的第二个最小值处也可能显示出偏振度的微小变化(约0.2%),但由于数据误差大,我们无法确认该特征是真实的。假设表面是均匀的,我们基于Ostro等人的形状模型进行了光曲线模拟。 (2000),Tanga等人。 (2001)和Roche binary(Cellino et al。,1985)。将模拟结果与在四个不同几何位置(1980、1982、1987和1999)获得的光曲线的配置进行了比较。 Cellino等人的模型。 (1985年)复制了几乎所有的数据点,而没有1987年的观测值,误差在0.05 mag。之内,这是3个模型中最好的结果。 Tanga等人的模型。 (2001年)很好地再现了光曲线,但未能再现1982年的振幅(类似于0.2 mag。的差Delta(diff))。我们还证实了Ostro等人的模型。 (2000)无法解释观察到的光曲线。

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