论文标题
关于Meteoroid 2020 CD3的轨道演变，这是一个临时捕获的土月系统的轨道
On the orbital evolution of meteoroid 2020 CD3, a temporarily captured orbiter of the Earth-Moon system
论文作者
论文摘要
在低速相遇期间，地球的重力最终可能会捕获地球状轨道之后的任何近地物体（NEO）。这种理论的可能性首先在1991 - 1992年的1991年VG飞行中得到证明，并确认了1992年2月的简短捕获事件 - 大约一个月。从2006年7月至2007年7月，将2006 RH120暂时捕获到中心轨道中时，获得了进一步的证据。在这里，我们对2020 CD3的轨道演化进行数值评估，最近发现的一个小新的NEO可能是地球重力暂时捕获的灭气体的第三个实例。我们确认2020年CD3目前正在遵循地理轨迹，尽管它将在2020年5月上旬逃脱到以地为中心的道路。我们的计算表明它是2016年地球捕获的（中位数）。这一集比2006年RH120的情节更长。在将其捕获为微小月份之前，2020 CD3可能是Aten类型的NEO，但不能排除Apollo类型。在这两种情况下，轨道都非常类似地球，偏心率低，倾斜度低，典型的Arjuna型Meteoroid。几个克隆轨道在近一个世纪中保持地理为中心，为存在尚未检测的微型季节打开了大门，这些轨道对于时间尺度相对稳定，可与未绑定的准清卫星相当，例如（469219）kamo'oalewa。此外，将近10％的实验导致了短暂的月亮发作，其中2020 CD3的硒中心能量的价值变为负。
Any near-Earth object (NEO) following an Earth-like orbit may eventually be captured by Earth's gravity during low-velocity encounters. This theoretical possibility was first attested during the fly-by of 1991 VG in 1991-1992 with the confirmation of a brief capture episode ---for about a month in 1992 February. Further evidence was obtained when 2006 RH120 was temporarily captured into a geocentric orbit from 2006 July to 2007 July. Here, we perform a numerical assessment of the orbital evolution of 2020 CD3, a small NEO found recently that could be the third instance of a meteoroid temporarily captured by Earth's gravity. We confirm that 2020 CD3 is currently following a geocentric trajectory although it will escape into a heliocentric path by early May 2020. Our calculations indicate that it was captured by the Earth in 2016 (median). This episode is longer than that of 2006 RH120. Prior to its capture as a minimoon, 2020 CD3 was probably a NEO of the Aten type, but an Apollo type cannot be excluded; in both cases, the orbit was very Earth-like, with low eccentricity and low inclination, typical of an Arjuna-type meteoroid. A few clone orbits remained geocentric for nearly a century, opening the door to the existence of yet-to-be-detected minimoons that are relatively stable for time-scales comparable to those of unbound quasi-satellites such as (469219) Kamo`oalewa. In addition, nearly 10 per cent of the experiments led to brief moon-moon episodes in which the value of the selenocentric energy of 2020 CD3 became negative.
