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arXiv 0909.0512astro-ph.EP
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双星小行星的同时光谱和光度观测

Simultaneous Spectroscopic and Photometric Observations of Binary Asteroids

D. Polishook, N. Brosch, D. Prialnik, S. Kaspi

摘要:

我们目前的结果可见波长光谱测量(0.45至0.72微米)的两个二元小行星,获得了1米望远镜在明智的天文台于2008年1月。小行星(90)Antiope和(1509)Esclangona被观察到寻找与其旋转相关的光谱变化,同时向观察者展示其表面的不同区域。同时进行光度观测与明智的天文台的0.46米望远镜,以调查旋转相位行为和可能的日食事件。(90)在我们的观测中,安提俄珀出现了一次日食。我们无法测量到任何斜率变化的分光光度在3%的误差范围内,除了一个稳定的下降,在总的光通量,而日食发生。我们的结论是,这两个组件的表面成分没有显着不同,这意味着一个共同的起源和历史。(1509)埃斯克兰戈纳没有出现日食,而是出现了一条独特的光变曲线,有三个峰值和一个宽而平的最小值,重复周期为3.2524小时。对光谱斜率的仔细测量揭示了(1509)Esclangona表面7%到10%的颜色变化,这与光度曲线中的特定区域相关。这一结果表明,光变曲线上的不同特征至少部分是由颜色变化造成的,也许可以用(1509)Esclangona上存在暴露的新鲜表面来解释。

英文摘要:

We present results of visible wavelengths spectroscopic measurements (0.45 to 0.72 microns) of two binary asteroids, obtained with the 1-m telescope at the Wise Observatory on January 2008. The asteroids (90) Antiope and (1509) Esclangona were observed to search for spectroscopic variations correlated with their rotation while presenting different regions of their surface to the viewer. Simultaneous photometric observations were performed with the Wise Observatory's 0.46-m telescope, to investigate the rotational phase behavior and possible eclipse events. (90) Antiope displayed an eclipse event during our observations. We could not measure any slope change of the spectroscopic albedo within the error range of 3%, except for a steady decrease in the total light flux while the eclipse took place. We conclude that the surface compositions of the two components do not differ dramatically, implying a common origin and history. (1509) Esclangona did not show an eclipse, but rather a unique lightcurve with three peaks and a wide and flat minimum, repeating with a period of 3.2524 hours. Careful measurements of the spectral albedo slopes reveal a color variation of 7 to 10 percent on the surface of (1509) Esclangona, which correlates with a specific region in the photometric lightcurve. This result suggests that the different features on the lightcurve are at least partially produced by color variations and could perhaps be explained by the existence of an exposed fresh surface on (1509) Esclangona.

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