关于C/2017 K2动力学演化的注记
Note on the dynamical evolution of C/2017 K2 PANSTARRS
摘要：
彗星C/2017 K2 PANSTARRS在2017年5月被发现时已经引起了人们对其活动的关注，当时它距离太阳约16 au。这颗奥尔特穗彗星将于2022年12月接近近日点，有关其动力学过去的问题是探索的重要问题之一。为此目的，有必要获得它的精确密切轨道，它的原始轨道，并将其运动时间向后传播到前一个近日点。我们研究了C/2017 K2到先前近日点（向后计算约3-4百万年）以及未来（向前计算约0.033百万年）的动力学演化。在行星系之外，银河系和恒星的扰动都被考虑在内。我们推导出C/2017 K2是一个动力学上古老的奥尔特穗彗星（1/a $_{prev}$ =（48.7 $\pm$ 7，9）x10 $^{-6}$ au $^{-1}$），97%的VC（标称q $_{prev}$ = 3.77 au）的近日点距离低于10 au。这意味着C/2017 K2在其之前的近日点期间已经访问了我们的行星区。因此，它几乎可以肯定是一颗动力学年龄较大的奥尔特穗彗星。
英文摘要：
(Abreviated) Comet C/2017 K2 PANSTARRS drew attention to its activity already at a time of its discovery in May 2017 when it was about 16 au from the Sun. This Oort spike comet will approach its perihelion in December 2022, and the question about its dynamical past is one of the important issues to explore. To this aim it is necessary to obtain its precise osculating orbit, its original orbit, and propagate its motion backwards in time to the previous perihelion. We study a dynamical evolution of C/2017 K2 to the previous perihelion (backward calculations for about 3-4 Myr) as well as to the future (forward calculations for about 0.033 Myr). Outside the planetary system both Galactic and stellar perturbations were taken into account. We derived that C/2017 K2 is a dynamically old Oort spike comet (1/a$_{prev}$ = (48.7 $\pm$ 7,9) x10$^{-6}$ au$^{-1}$) with the previous perihelion distance below 10 au for 97 per cent of VCs (nominal q$_{prev}$ = 3.77 au). It means that C/2017 K2 has already visited our planetary zone during its previous perihelion passage. Thus, it is almost certainly a dynamically old Oort spike comet.
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