天文学进展2025，Vol.43Issue(1)：100-113,14.DOI:10.3969/j.issn.1000-8349.2025.01.06
小行星(2572)Annschnell测光数据分析——相接双小行星模型参数测定
Photometry Analysis of Asteroid(2572)Annschnell——the Contact Binary Asteroids Model
摘要
Abstract
The density of small solar system objects is very important for understanding their origin and evolutionary history.However,the determination of the densities of small solar system objects is still a challenging work so far.The binary asteroids provide an oppor-tunity to infer their density.The contact binary asteroid is one type of synchronous binary asteroids,whose orbital semi-major axis is close to the sum of the maximum semi-major axes of two asteroids assuming ellipsoid shapes.Till now,similar systems have been discovered in other small object groups of the solar system,for example,Near-Earth asteroids,Tro-jans,and Kuiper Belt objects.Considering a rubble pile structure of asteroids,the Roche binary asteroid theory can be applied to determine the system parameters including density of asteroids.Asteroid(2572)Annschnell is found possible to be a contact binary asteroid due to special features in its lightcurves obtained by the Yunnan-Hong Kong Wide Field Survey in 2017.A brightness model of the contact binary asteroid is developed,with which the photometric data of(2572)Annschnell are analysed then.The most possible value of density of this binary asteroid is 3.15 g/cm3,which is close to that of CV and CK meteorites.Based on the estimate of the normalised rotation rateΩ=0.34 and the dimensionless total angular momentum H=0.48,it is conjectured that this binary asteroid may be formed by the rotational fission of a spinning asteroid.关键词
太阳系小行星/洛希双小行星/相接双小行星/光度模型Key words
asteroids/Roche binary asteroid/contact binary asteroids/brightness model分类
天文学引用本文复制引用
黄敬,王晓彬,窦江培..小行星(2572)Annschnell测光数据分析——相接双小行星模型参数测定[J].天文学进展,2025,43(1):100-113,14.基金项目
国家自然科学基金(12373069,U2031210) （12373069,U2031210）
国家重大科研仪器研制项目(11827804) （11827804）
中国载人航天工程巡天空间望远镜专项(CMS-CSST-2021-B08,CMS-CSST-2021-A11,CMS-CSST-2021-B0) （CMS-CSST-2021-B08,CMS-CSST-2021-A11,CMS-CSST-2021-B0）
