AI 中文总结
研究彗星C/2026 A1轨道运动，通过广泛计算包括积分回溯及虚拟克隆并行积分。关注其与公元363年白昼彗星关联，发现上一次近日点时间受非引力影响，还认为三颗矮掠日彗星是伴星，表明它是更大天体一部分且属第一族。
AI 中文摘要
我们报告了对彗星C/2026 A1轨道运动进行广泛计算的结果，包括将其轨道积分回溯到公元4世纪以及对1000个虚拟克隆进行并行积分。我们关注这颗克鲁兹掠日彗星与公元363年被阿米阿努斯·马尔切利努斯记录的白昼彗星的明显关联。我们表明，推导的上一次近日点时间受到不稳定的排气驱动非引力的强烈影响，并且取决于所选的观测数据集。我们发现，只有当我们使用截至2026年2月9日至12日的观测数据时，上一次近日点才在公元363年的约1个标准差内，即大约±15年达到，这是彗星光曲线出现重大异常特征的时间。我们认为，在2026年3月31日至4月12日期间检测到的三颗明亮的矮掠日彗星几乎肯定是远距离伴星，这表明C/2026 A1是一个更大天体的一部分，该天体在公元363年近日点时与1843年大彗星的祖先分离，然后在远日点后远离太阳分裂。这种情况得到了所需轨道相似性的支持，并表明彗星C/2026 A1是第一族的成员。
英文摘要
We report results of our extensive computations of the orbital motion of comet C/2026 A1, including its integration back to the fourth century and parallel integration of 1000 virtual clones. We focus on this Kreutz sungrazer's apparent association with the daylight comets in AD 363, recorded by Ammianus Marcellinus. We show that the derived time of the previous perihelion is strongly affected by erratic outgassing-driven nongravitational forces and depends on the chosen set of observations. We find that the previous perihelion was reached within about 1 sigma, or some +/-15 years, of AD 363 only when we use the observations up to 2026 February 9-12, the time of a major anomalous feature on the comet's light curve. We suggest that three bright dwarf sungrazers detected between 2026 March 31 and April 12 were almost certainly distant companions, offering evidence that C/2026 A1 was part of a larger object, which separated at perihelion in AD 363 from what appears to have been the ancestor of the Great March Comet of 1843 and then fragmented far from the Sun after aphelion. This scenario is supported by required orbital similarity and suggests that comet C/2026 A1 was member of Population I.
Comments12 pages, 2 figures, 7 tables
