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

望远镜时间已被授予研究近地小行星1999 JV6的小行星YORP效应。建议摘要：YORP效应是小行星所经历的扭矩，这是由于入射太阳辐射压力和反冲效应从热光子的各向异性发射。它可以改变它们的旋转速率和自旋轴方向，并可以解释小行星科学中观察到的许多现象。我们建议使用INT+WFC获得近地小行星（85990）1999 JV6在2016年上半年特定日期的旋转光变曲线，其目的是直接检测YORP引起的旋转周期变化。我们将协调这些INT观测与阿雷西博天文台行星雷达系统的观测。如果雷达导出的形状模型是可用的，那么YORP分析将大大增强。雷达数据的分析反过来又得到了光学旋转光变曲线的支持，这些光变曲线在时间上接近雷达观测。

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.