Physical Characterization of the Bilobate Near-Earth Asteroid (85990) 1999 JV6, and Detection of the YORP Effect

利用望远镜时间研究近地小行星1999 JV6对小行星的YORP效应。摘要YORP效应是小行星在入射太阳辐射压力和热光子各向异性发射的反冲效应共同作用下产生的扭矩。它可以改变它们的旋转速率和自旋轴方向，并可以解释许多在小行星科学中观察到的现象。我们建议使用INT+WFC获得近地小行星（85990）1999 JV6在2016A学期特定日期的旋转光曲线，目的是直接检测yorp引起的旋转周期变化。我们将把这些INT观测与阿雷西博天文台行星雷达系统的观测相协调。如果雷达导出的形状模型可用，YORP分析将大大增强。对雷达数据的分析反过来又得到光学旋转光曲线的支持，这些光曲线是在接近雷达观测的时间内拍摄的。

Telescope time has been awarded to study the asteroidal YORP effect on Near-Earth asteroid 1999 JV6.Proposal Abstract: The YORP effect is a torque experienced by small asteroids that is due to both incident solar radiation pressure and the recoil effect from the anisotropic emission of thermal photons. It can modify their rotation rates and spin-axis orientations, and can explain many observed phenomena in asteroidal science. We propose to use the INT+WFC to obtain rotational lightcurves of near-Earth asteroid (85990) 1999 JV6 at specific dates in semester 2016A, the aim of which is to directly detect YORP-induced rotation period changes. We will coordinate these INT observations with observations from the Arecibo Observatory Planetary Radar system. The YORP analysis is greatly enhanced if a radar-derived shape model is available. The analysis of radar data is in turn supported by optical rotational lightcurves, taken close in time to the radar observations.