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标题：Component properties and mutual orbit of binary main-belt comet 288P/(300163) 2006 VW 139
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作者：J. Agarwal ; Y. Kim ; D. Jewitt 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2020
卷号：643
页码：1-38
DOI：10.1051/0004-6361/202038195
语种：English
出版社：EDP Sciences
摘要：Context.The binary asteroid 288P/(300163) is unusual both for its combination of wide-separation and high mass ratio and for its comet-like activity. It is not currently known whether there is a causal connection between the activity and the unusual orbit or if instead the activity helped to overcome a strong detection bias against such sub-arcsecond systems.Aims.We aim to find observational constraints discriminating between possible formation scenarios and to characterise the physical properties of the system components.Methods.We measured the component separation and brightness using point spread function fitting to high-resolutionHubbleSpace Telescope/Wide Field Camera 3 images from 25 epochs between 2011 and 2020. We constrained component sizes and shapes from the photometry, and we fitted a Keplerian orbit to the separation as a function of time.Results.Approximating the components A and B as prolate spheroids with semi-axis lengthsa
关键词：Key wordsenminor planets, asteroids: individual: 288P/(300163)