arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1301.7205astro-ph.EP
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稀疏光度数据在小行星形状建模中的潜力

The potential of sparse photometric data in asteroid shape modeling

J. Hanuš, J. Ďurech

摘要:

我们调查的潜在的稀疏数据产生的Catalina巡天天体测量项目(简称CSS)在小行星的形状和旋转状态的光变曲线反演方法确定。我们表明,虽然CSS数据的光度质量,相比密集的数据,是显着更差,它是在原则上可能的,这些数据是为一些小行星具有高的光变曲线振幅足够的一个独特的形状确定。$\sim$ 180个小行星的CSS数据可用,这些小行星的形状模型以前是从不同的光度数据集得出的。对于13个小行星从这个样本中,我们得出他们独特的形状模型的基础上,只有CSS数据,比较两个独立的形状模型在一起,并讨论模型的可靠性,仅来自CSS数据。我们还使用CSS数据来确定形状模型的小行星与已知的旋转周期值,推导出12个独特的模型,并比较以前公布的周期从全三维建模的光曲线反演方法确定的周期。最后,我们测试不同的形状分辨率中使用的光变曲线反演方法,以找到可靠的小行星模型。

英文摘要:

We investigate the potential of the sparse data produced by the Catalina Sky Survey astrometric project (CSS for short) in asteroid shape and rotational state determination by the lightcurve inversion method. We show that although the photometric quality of the CSS data, compared to the dense data, is significantly worse, it is in principle possible that these data are for some asteroids with high lightcurve amplitudes sufficient for a unique shape determination. CSS data are available for $\sim$180 asteroids for which shape models were previously derived from different photometric data sets. For 13 asteroids from this sample, we derive their unique shape models based only on CSS data, compare the two independent shape models together and discuss the reliability of models derived from only CSS data. We also use CSS data to determine shape models for asteroids with already known rotational period values, derive 12 unique models and compare previously published periods with periods determined from the full 3D modeling by the lightcurve inversion method. Finally, we test different shape resolutions used in the lightcurve inversion method in order to find reliable asteroid models.

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