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arXiv 2608.29698astro-ph.EP

双子座望远镜与阿帕奇点天文台对正在碎裂的长周期彗星C/2025 K1(ATLAS)的多波段光学成像表征

Gemini and Apache Point Multi-band Optical Imaging Characterization of Fragmenting Long-period Comet C/2025 K1 (ATLAS)

  • Johns Hopkins University(约翰斯·霍普金斯大学)
  • Eureka Scientific(尤里卡科学公司)
  • Johns Hopkins University Applied Physics Laboratory(约翰斯·霍普金斯大学应用物理实验室)
  • California Institute of Technology(加州理工学院)
  • University of Oklahoma(俄克拉荷马大学)
  • European Space Agency(欧洲空间局)
  • Jet Propulsion Laboratory, California Institute of Technology(加州理工学院喷气推进实验室)

机构由 AI 辅助整理,请以论文原文为准。

Carl Ingebretsen, Bryce T. Bolin, Meredith A. MacGregor, Carey M. Lisse, Matthew Belyakov, Gracyn Jewett, Mukremin Kilic, Marco Micheli, Davide Farnocchia, Brian Lemaux, Hyewon Suh

AI总结:

本研究通过双子座望远镜与阿帕奇点天文台的多波段光学成像,识别出彗星C/2025 K1的4个碎片,测定其色指数异常,并计算出碎片A、C的毫米级尘埃质量损失率约为50 kg/s。

AI中文摘要:

我们呈现了2025年12月6日和12月24日使用北双子座8.1米望远镜/GMOS成像仪对C/2025 K1(ATLAS)开展的g、r、i多波段观测结果,以及2025年12月8日使用天体物理研究联盟(ARC)3.5米望远镜/ARCTIC成像仪开展的u、g、r、i、z多波段观测结果。我们在2025年12月6日至24日获取的双子座和ARC图像中识别出至少4个不同的碎片,在数据中被标记为A、C、D和E。色指数由2025年12月8日ARC对碎片A和C的观测,以及2025年12月24日双子座对碎片A、C和D的观测确定。K1具有异常蓝的g-r色指数,约为0.40。彗星与其碎片在两个观测历元的色指数差异可由粒子尺寸和光散射效应解释。我们利用双子座观测计算了碎片A、C和D的尘埃质量损失率,得出结论:C/2025 K1的尘埃质量损失率处于中等水平,其中碎片A和C的毫米级尘埃质量损失率约为50 kg/s。

英文摘要:

We present results from multi-band g, r, and i, observations of C/2025 K1 (ATLAS) taken with the Gemini North 8.1-m/GMOS imager on 2025 December 6 and December 24, and u, g, r, i, and z observations with the Astrophysical Research Consortium (ARC) 3.5-m/ARCTIC imager on 2025 December 8. We identify at least four distinct fragments in the Gemini and ARC images, designated as A, C, D, and E in these data taken between 2025 December 6 and 24. Color indices are determined from the December 8 ARC observations of fragments A and C, and from the Gemini observations on December 24 for A, C, and D. K1 has an unusually blue g-r color of $\sim$0.40. The color difference between the comet and its fragments at the two epochs may be explained by particle size and light-scattering effects. We used the Gemini observations to calculate dust mass-loss rates for fragments A, C, and D. We conclude that C/2025 K1 has moderate dust mass-loss rates for millimeter-sized dust of $\sim$50 kg/s for the A and C fragments.

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