1. Orbital stability analysis and photometric characterization of the second Earth Trojan asteroid 2020 XL5
- Author
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Generalitat Valenciana, European Commission, Ministerio de Ciencia e Innovación (España), National Science Centre (Poland), Ministério da Ciência e Tecnologia (Brasil), National Science Foundation (US), National Aeronautics and Space Administration (US), Santana-Ros, Toni, Micheli, Marta, Faggioli, L., Cennamo, R., Devogèle, M., Alvarez-Candal, A., Oszkiewicz, D., Ramírez, O., Liu, P. -Y., Benavidez, P. G., Campo Bagatin, A., Christensen, E. J., Wainscoat, R. J., Weryk, R., Fraga, L., Briceño, César, Conversi, L., Generalitat Valenciana, European Commission, Ministerio de Ciencia e Innovación (España), National Science Centre (Poland), Ministério da Ciência e Tecnologia (Brasil), National Science Foundation (US), National Aeronautics and Space Administration (US), Santana-Ros, Toni, Micheli, Marta, Faggioli, L., Cennamo, R., Devogèle, M., Alvarez-Candal, A., Oszkiewicz, D., Ramírez, O., Liu, P. -Y., Benavidez, P. G., Campo Bagatin, A., Christensen, E. J., Wainscoat, R. J., Weryk, R., Fraga, L., Briceño, César, and Conversi, L.
- Abstract
Trojan asteroids are small bodies orbiting around the L or L Lagrangian points of a Sun-planet system. Due to their peculiar orbits, they provide key constraints to the Solar System evolution models. Despite numerous dedicated observational efforts in the last decade, asteroid 2010 TK has been the only known Earth Trojan thus far. Here we confirm that the recently discovered 2020 XL is the second transient Earth Trojan known. To study its orbit, we used archival data from 2012 to 2019 and observed the object in 2021 from three ground-based observatories. Our study of its orbital stability shows that 2020 XL will remain in L for at least 4 000 years. With a photometric analysis we estimate its absolute magnitude to be Hr=18.58−0.15+0.16, and color indices suggestive of a C-complex taxonomy. Assuming an albedo of 0.06 ± 0.03, we obtain a diameter of 1.18 ± 0.08 km, larger than the first known Earth Trojan asteroid.
- Published
- 2022