期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 922, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/2041-8213/ac37bf
关键词
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资金
- Natural Sciences and Engineering Research Council of Canada [RGPIN-201805659]
- NASA [80NSSC21K0807]
Earth Trojans are coorbitals librating around the Lagrange points L (4) or L (5) of the Sun-Earth system. Only one transient member has been discovered so far. The latest research confirms that 2020 XL5 is a new Earth Trojan, but its eccentric orbit may make it dynamically unstable over the next few thousand years.
The Earth Trojans are coorbitals librating around the Lagrange points L (4) or L (5) of the Sun-Earth system. Although many numerical studies suggest that they can maintain their dynamical status and be stable on timescales up to a few tens of thousands of years or even longer, they remain an elusive population. Thus far only one transient member (2010 TK7) has been discovered serendipitously. Here, we present a dynamical study of asteroid 2020 XL5. With our meticulous follow-up astrometric observations of the object, we confirmed that it is a new Earth Trojan. However, its eccentric orbit brings it close encounters with Venus on a frequent basis. Based on our N-body integration, we found that the asteroid was captured into the current Earth Trojan status in the fifteenth century, and then it has a likelihood of 99.5% to leave the L (4) region within the next similar to 10 kyr. Therefore, it is most likely that 2020 XL5 is dynamically unstable over this timescale.
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