The physical and dynamical characteristics of the asteroid 4940 Polenov

IF 0.8 4区物理与天体物理 Q4 ASTRONOMY & ASTROPHYSICS

Serbian Astronomical Journal Pub Date : 2021-01-01 DOI:10.2298/saj2102039v

E. Vchkova-Bebekovska, N. Todorović, A. Kostov, Z. Donchev, G. Borisov, G. Apostolovska

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引用次数: 0

Abstract

The asteroid (1986 QY4) 4940 Polenov is the first Solar system object whose 3D shape is determined using the observations from the newly built Astronomical Station Vidojevica (ASV). Here we present the results of photometric observations for Polenov, gathered from the ASV, and from the Bulgarian National Astronomical Observatory (BNAO) Rozhen, during 2014, 2019 and 2020 apparitions. Polenov is a 17.8km object located in the outer part of the main belt and belongs to the asteroid family Themis. We have determined the lightcurves, the synodic period of 4.161?0.001 h, as well as the solution for the shape and spin axis. Using the lightcurve inversion method, the combination of our lightcurves and the sparse data from ATLAS{HKO and ATLAS-MLO, we also found the sidereal period, indicating a retrograde rotation of the asteroid, with two possible mirrored pole solutions. The ratio of the largest to smallest reecting surface is about 1.4. In addition, we studied the dynamical properties of the asteroid and obtained a long stability time that exceeds 0.4 Gyrs.

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波列诺夫4940小行星的物理和动力学特性

小行星(1986 QY4) 4940 Polenov是第一个利用新建的维多耶维察天文台(ASV)的观测确定其三维形状的太阳系物体。在这里，我们展示了Polenov在2014年、2019年和2020年出现期间从ASV和保加利亚国家天文台(BNAO) Rozhen收集的光度观测结果。Polenov是一个17.8公里的天体，位于主带的外侧，属于忒弥斯小行星家族。我们确定了光曲线，滑合周期为4.161?0.001 h，以及形状和自转轴的解。利用光曲线反演方法，结合我们的光曲线和ATLAS{HKO和ATLAS- mlo的稀疏数据，我们还发现了恒星周期，表明小行星的逆行旋转，有两个可能的镜像极点解。最大与最小反射面之比约为1.4。此外，我们对小行星的动力学特性进行了研究，获得了超过0.4 Gyrs的长稳定时间。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Serbian Astronomical Journal ASTRONOMY & ASTROPHYSICS-

CiteScore

1.00

自引率

0.00%

发文量

审稿时长

12 weeks

期刊介绍： Serbian Astronomical Journal publishes original observations and researches in all branches of astronomy. The journal publishes: Invited Reviews - review article on some up-to-date topic in astronomy, astrophysics and related fields (written upon invitation only), Original Scientific Papers - article in which are presented previously unpublished author''s own scientific results, Preliminary Reports - original scientific paper, but shorter in length and of preliminary nature, Professional Papers - articles offering experience useful for the improvement of professional practice i.e. article describing methods and techniques, software, presenting observational data, etc. In some cases the journal may publish other contributions, such as In Memoriam notes, Obituaries, Book Reviews, as well as Editorials, Addenda, Errata, Corrigenda, Retraction notes, etc.