Photometric Analysis for Asteroid(81)Terpsichore using Convex Inversion and Phase Function Fitting Methods  

作　　者：Ao Wang Xiaobin Wang Xiaoyun Xu Longhua Qin Quangui Gao Huaizhen Li Yong Xiao Hairu Zhao 

机构地区：[1]Department of Physics,Yuxi Normal University,Yuxi 653100,China [2]Yunnan Observatories,Chinese Academy of Sciences,Kunming 650216,China [3]Key Laboratory for the Structure and Evolution of Celestial Objects,Chinese Academy of Sciences,Kunming 650216,China [4]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Research in Astronomy and Astrophysics》2024年第6期201-208,共8页天文和天体物理学研究（英文版）

基　　金：financial support from the Science Research Foundation of Yunnan Education Department of China(grant 2020J0649);the Natural Science Foundation of Yunnan Province(grant 202101AU070010);the financial support from the Hundred Talents Program of Yuxi(grant 2019-003)。

摘　　要：The shapes and rotation states(periods and pole orientations)of main-belt asteroids are important for understanding their formation and evolution.In order to obtain sufficient photometric data covering different apparitions for asteroid(81)Terpsichore,ground-based photometric observations in 2020 and 2021 were carried out.By combining published and newly obtained photometric data,we calculated the shape and spin parameters for(81)Terpsichore using the convex inversion method.With this method,we have derived a best fitted pole orientation—(22.2±_(3.1)^(3.3°),17.5±_(5.5)^(10.8°))with a spin period of 10.94±_(0.01)^(0.01)h.Based on the derived convex shape of(81)Terpsichore,we have fitted the H,G+1,G_(2)phase function using the calibrated TESS data and Gaia data after accounting for the lightcurve amplitude correction.As a result,we have derived its absolute magnitude H=8.68±_(0.19)^(0.22)mag with corresponding phase function parameters G_(1)=0.82±_(0.10)^(0.09)and G_(2)=0.02±_(0.02)^(0.03).

关 键 词：asteroids:general minor planets asteroids:individual(Terpsichore) techniques:photometric 

分 类 号：P185.7[天文地球—天文学]