文章基本信息

标题：Disintegration of active asteroid P/2016 G1 (PANSTARRS)
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作者：Olivier R. Hainaut ; Jan T. Kleyna ; Karen J. Meech 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2019
卷号：628
页码：1-10
DOI：10.1051/0004-6361/201935868
语种：English
出版社：EDP Sciences
摘要：We report on the catastrophic disintegration of P/2016 G1 (PANSTARRS), an active asteroid, in April 2016. Deep images over three months show that the object is made up of a central concentration of fragments surrounded by an elongated coma, and presents previously unreported sharp arc-like and narrow linear features. The morphology and evolution of these characteristics independently point toward a brief event on 2016 March 6. The arc and the linear feature can be reproduced by large particles on a ring, moving at ~2.5 m s−1. The expansion of the ring defines a cone with a ~40° half-opening. We propose that the P/2016 G1 was hit by a small object which caused its (partial or total) disruption, and that the ring corresponds to large fragments ejected during the final stages of the crater formation.
关键词：Key wordsencomets: generalcomets: individual: P/2016 G1minor planets, asteroids: general