Migratory Outbursting Quasi-Hilda Object 282P/(323137) 2003 BM80
Migratory Outbursting Quasi-Hilda Object 282P/(323137) 2003 BM80
复制标题
迁移性爆发准希尔达天体 282P/(323137) 2003 BM80
DOI：
10.3847/2041-8213/ac897a
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
C. Trujillo
中科院分区：
文献类型：
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作者：
C. O. Chandler;W. J. Oldroyd;C. Trujillo
我们报告说，对象282 P/（323137）2003 BM 80正在经历一个持续的活动爆发，持续超过15个月迄今。这些发现部分源于我们的NASA合作伙伴公民科学项目Active Asteroids（http：activeasteroids.net），我们在这里介绍。我们通过我们的观测活动（梵蒂冈先进技术望远镜（VATT），洛厄尔发现望远镜（LDT）和双子座南方望远镜）获得了282 P的新观测结果，证实282 P在UT 2022年6月7日活跃，大约在2021年3月图像显示2021-2022年时期活动的15个月后。我们将282 P归类为准希尔达天体（QHO）的一员，这是一组在轨道区域发现的动态不稳定天体，类似于希尔达小行星（与木星发生3：2共振的天体），但其动力学特征不同。我们的动力学模拟显示，在过去的180年里，282 P至少经历了五次与木星的近距离接触，一次与土星的近距离接触。282 P很可能是250年前的半人马座或半人马座家族彗星（JFC）。在350年内，经过大约15次强烈的木星相互作用，282 P很可能迁移成为JFC，或者不太可能成为外主带小行星轨道。这些迁移突出了一个连接半人马座和JFC与准希尔达斯和潜在的活跃小行星的动力学路径。综合这些结果与我们的化学模拟和新的活动观察，我们发现挥发升华是主要的活动机制。我们预计在2023年可能观测到静止的282 P，这将有助于通过测量旋转周期和确定光谱类型来证实我们的假设。
We report that object 282P/(323137) 2003 BM80 is undergoing a sustained activity outburst, lasting over 15 months thus far. These findings stem in part from our NASA Partner Citizen Science project Active Asteroids (http://activeasteroids.net), which we introduce here. We acquired new observations of 282P via our observing campaign (Vatican Advanced Technology Telescope (VATT), Lowell Discovery Telescope (LDT), and the Gemini South telescope), confirming 282P was active on UT 2022 June 7, some 15 months after 2021 March images showed activity in the 2021–2022 epoch. We classify 282P as a member of the quasi-Hilda objects (QHOs), a group of dynamically unstable objects found in an orbital region similar to, but distinct in their dynamical characteristics to, the Hilda asteroids (objects in 3:2 resonance with Jupiter). Our dynamical simulations show 282P has undergone at least five close encounters with Jupiter and one with Saturn over the last 180 yr. 282P was most likely a Centaur or Jupiter-family comet (JFC) 250 yr ago. In 350 yr, following some 15 strong Jovian interactions, 282P will most likely migrate to become a JFC or, less likely, an outer main-belt asteroid orbit. These migrations highlight a dynamical pathway connecting Centaurs and JFCs with quasi-Hildas and, potentially, active asteroids. Synthesizing these results with our thermodynamical modeling and new activity observations, we find volatile sublimation is the primary activity mechanism. Observations of a quiescent 282P, which we anticipate will be possible in 2023, will help confirm our hypothesis by measuring a rotation period and ascertaining the spectral type.