论文标题
（1685）Toro和（85989）1999 JD6的形状模型和旋转加速度从光学观测
Shape model and rotation acceleration of (1685) Toro and (85989) 1999 JD6 from optical observations
论文作者
论文摘要
Yarkovsky-O'Keefe-Radzievskii-Paddack（YORP）效应是由太阳辐射直接反射并从小型小行星表面进行热重新重新重新定量的净扭矩，被认为对动态进化至关重要。通过对选定的近地小行星的长期光度观察，希望扩大具有检测到YORP效应的小行星样品，以促进理论框架的发展。收集了存档的光曲线数据，并对（1685）Toro和（85989）1999 JD6进行了光度观测，该JD6可以通过反转光曲线来拟合从CONVEX形状模型的观测值来测量其YORP效应。对于（1685）Toro，Yorp加速$ \ UPSILON =（3.2 \ pM0.3）\ times10^{ - 9} \ \ \ \ \ \ \ \ \ \ rm {rad \ cdot d^{ - 2}}}}}（1σ错误）$已更新，这是与以前的Yorp检测一致的，基于不同的YORP检测基于不同的照明数据；对于（85989）1999 JD6，确定恒星周期为$ 7.667749 \ pm 0.000009 $ h，旋转极方向定位为$λ= 232 \ pm 2^{\ circ}，\β{\β= -59 \ pm 1^pm 1^{\ circon，up $ $ $ （2.4 \ pm0.3）\ times10^{ - 8} \ \ rm {rad \ cdot d^{ - 2}}}（1σ误）$，除了获得观测值和模型之间的出色一致性外。 YORP应同时产生旋转和旋转案例。但是，包括（85989）1999 JD6，$ \ rm {d}ω/\ rm {d} t $值十一近十一小行星的值完全是积极的，这表明在YORP检测样本中存在偏见，或者需要解释真正的特征。
The Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect is a net torque caused by solar radiation directly reflected and thermally re-emitted from the surface of small asteroids and is considered to be crucial in their dynamical evolution. By long-term photometric observations of selected near-Earth asteroids, it's hoped to enlarge asteroid samples with a detected YORP effect to facilitate the development of a theoretical framework. Archived light-curve data are collected and photometric observations are made for (1685) Toro and (85989) 1999 JD6, which enables measurement of their YORP effect by inverting the light curve to fit observations from a convex shape model. For (1685) Toro, a YORP acceleration $\upsilon=(3.2\pm0.3)\times10^{-9}\ \rm{rad\cdot d^{-2}}(1σ error)$ is updated, which is consistent with previous YORP detection based on different light-curve data; for (85989) 1999 JD6, it is determined that the sidereal period is $7.667749\pm 0.000009$ h, the rotation pole direction locates is at $λ=232\pm 2^{\circ},\ β= -59\pm 1^{\circ}$, the acceleration is detected to be $\upsilon = (2.4\pm0.3)\times10^{-8}\ \rm{rad\cdot d^{-2}}(1σ error)$ and in addition to obtaining an excellent agreement between the observations and model. YORP should produce both spin-up and spin-down cases. However, including (85989) 1999 JD6, the $\rm{d}ω/\rm{d}t$ values of eleven near-Earth asteroids are positive totally, which suggests that there is either a bias in the sample of YORP detections or a real feature needs to be explained.
