• DOI:10.3847/2041-8213/ac37bf
• Corpus ID: 243860678

The Second Earth Trojan 2020 XL5

@article{Hui2021TheSE,
  title={The Second Earth Trojan 2020 XL5},
  author={Man-To 文韜 Hui 許 and Paul A. Wiegert and David J. Tholen and Dora F{\"o}hring},
  journal={The Astrophysical Journal Letters},
  year={2021},
  volume={922}
}

• Man-To 文韜 Hui 許, P. Wiegert, +1 author D. Föhring
• Published 9 November 2021
• Physics, Geology
• The Astrophysical Journal Letters

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 ∼10 kyr. Therefore, it is most likely that 2020 XL5 is dynamically unstable over this timescale.