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<\/a><\/p>\nNuestro planeta tiene un\u00a0asteroide\u00a0que precede el camino de la Tierra alrededor del sol, y es solo el segundo asteroide troyano terrestre jam\u00e1s descubierto. Los astr\u00f3nomos observaron el asteroide 2020 XL5 utilizando el Telescopio de Investigaci\u00f3n Astrof\u00edsica del Sur en Chile. “Los troyanos son objetos que comparten una \u00f3rbita con un planeta, agrupados alrededor de una de las dos \u00e1reas especiales equilibradas gravitacionalmente a lo largo de la \u00f3rbita del planeta conocidas como puntos de Lagrange”, dijo el coautor del estudio Cesar Brice\u00f1o, cient\u00edfico del telescopio SOAR en el Observatorio Interamericano Cerro Tololo. Los puntos de Lagrange son regiones del espacio donde se equilibra la atracci\u00f3n gravitacional del sol y uno de los planetas. La \u00f3rbita estable de los asteroides troyanos terrestres los har\u00eda ideales para sobrevuelos de futuras misiones espaciales.<\/p>\n
Trojan asteroids are small bodies orbiting around the L4 or L5 Lagrangian points of a Sunplanet 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 TK7 has been the only known Earth Trojan thus far. Here we confirm that the recently discovered 2020 XL5 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 groundbased observatories. Our study of its orbital stability shows that 2020 XL5 will remain in L4 for at least 4 000 years. With a photometric analysis we estimate its absolute magnitude to be Hr \u00bc18:58\u00fe0:16 0:15, and color indices suggestive of a C-complex taxonomy. Assuming an albedo of 0.06\u00b10.03, we obtain a diameter of 1.18\u00b10.08 km, larger than the first known Earth Trojan asteroid.<\/p>\n