主带彗星的长期光变曲线  

Secular Light Curve of Main-belt Comets

作　　者：梁合 史建春[1,3,4] 马月华 LIANG He;SHI Jian-chun;MA Yue-hua(Key Laboratory of Planetary Sciences,Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023;School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026;Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030;Center for Excellence in Comparative Planetology,Chinese Academy of Sciences,Hefei 230026)

机构地区：[1]中国科学院紫金山天文台/中国科学院行星科学重点实验室,南京210023 [2]中国科学技术大学天文与空间科学学院,合肥230026 [3]中国科学院上海天文台,上海200030 [4]中国科学院比较行星学卓越创新中心,合肥230026

出　　处：《天文学报》2025年第2期12-25,共14页Acta Astronomica Sinica

基　　金：国家自然科学基金项目(12173093、12033010);江苏省自然科学基金项目(BK20191512);中国载人空间项目(CMSCSST-2021-B08);小行星基金会资助。

摘　　要：主带彗星是指既具有主带小行星的轨道特征,又具有类似彗星的彗发或彗尾的小天体,其活动性是由水冰升华驱动.通过收集最近20多年的主带彗星观测数据,绘制了5颗主带彗星238P/Read、259P/Garradd、313P/Gibbs、324P/La Sagra和358P/PANSTARRS的长期光变曲线,进而分析了主带彗星的活动性特征.研究发现:(1)238P/Read的活动性比较稳定,其他4颗主带彗星的活动性相较于之前的回归周期均存在不同程度的衰减;(2)通过比较反映彗星活动性的参数测光年龄PAGE,发现324P/La Sagra在2010年的活动性最强,313P/Gibbs在2014年的活动性最弱;(3)313P/Gibbs在2020年回归周期出现了明显的非近日点活动性.(4)主带彗星的活动性开始和结束时对应的时间和日心距相对于过近日点时间和日心距具有不对称性.The main-belt comets(MBC)refer to both having the orbital characteristics of the mainbelt asteroids and having the comet like coma or tail,its activity is driven by water ice sublimation.We collected MBC observation data from the past 20 years and plotted the Secular Light Curves(SLC)of the MBC 238P/Read,259P/Garradd,313P/Gibbs,324P/La Sagra and 358P/PANSTARRS,thereby analyzing the activity characteristics of the MBCs.We get the following conclusions:(1)The activity of 238P was found to be relatively stable,while the activity of other main-belt comets showed varying degrees of attenuation compared to the previous perihelion passage.(2)By comparing the photometric age PAGE,which reflects the activity of comets,we sorted the activity level of five main-belt comets and found that 324P had the strongest activity in 2010 and 313P had the weakest activity in 2014.(3)313P showed significant non-perihelion activity during the 2020 perihelion passage,which was not observed in previous perihelion passages.(4)The time and heliocentric distance corresponding to the beginning and end of the main-belt comet’s activity are asymmetric compared to the perihelion time and heliocentric distance.

关 键 词：天体测量 方法:观测 技术:测光 彗星:个别:238P/Read 259P/Garradd 313P/Gibbs 324P/La Sagra 358P/PANSTARRS 

分 类 号：P185[天文地球—天文学]