系外行星研究组知识库

小行星基本物理参量(周期、形状、自转)对于理解小行星起源、演化和碰撞具有重要意义.利用测光手段可以获得小行星的光变曲线,通过光变曲线可以确定小行星基本参数.利用云南天文台1 m望远镜在2000和2015年对小行星(58)Concordia进行观测,结合前人测光观测数据,通过凸面体光变曲线反演模型获得该小行星的周期、形状和轴指向.(58)Concordia的恒星周期为9.894541 h,在黄道坐标系下,极轴指向为λ1=15.3°±0.7°,β1=-4.2°±2.6°,另外一组解为λ2=195.9°±1.0°,β2=4.8°±1.2°.

The basic physical parameters(period,shape,and rotation)of asteroids are important for understanding the origin,evolution,and collision of asteroids.The photometric observations can be used to obtain the lightcurves of asteroids.The basic parameters of asteroid can be determined from the lightcurves.The(58)Concordia was observed by 1 m telescope of Yunnan Observatories in 2000 and 2015.Combined with the previous photometric data,we analyzed the period,orientation,and shape of(58)Concordia by the convex lightcurve inversion method.The sidereal period of(58)Concordia was obtained at 9.894541 h,and a pair of pole orientations are found around(15.3°±0.7°,-4.2°±2.6°)and(195.9°±1.0°,4.8°±1.2°)in the ecliptic coordinate system.