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A hypothetical planet-sized Earth trojan the size of Mars, given the name Theia, is thought by proponents of the giant-impact hypothesis to be the origin of the Moon.The hypothesis states that the Moon formed after Earth and Theia collided, [10] showering material from the two planets into space.
Whether or not a system of star, planet, and trojan is stable depends on how large the perturbations are to which it is subject. If, for example, the planet is the mass of Earth, and there is also a Jupiter-mass object orbiting that star, the trojan's orbit would be much less stable than if the second planet had the mass of Pluto.
Earth trojans are asteroids located in the Earth–Sun Lagrangian points L 4 and L 5. Their location in the sky as observed from Earth's surface would be fixed at about 60 degrees east and west of the Sun, and as people tend to search for asteroids at much greater elongations few searches have been done in these locations.
Position of 2010 TK 7 relative to Earth in 2011 Effective potential plot showing Earth's Lagrangian points (not to scale); contours around L 4 and L 5 represent tadpole loop paths. Because Earth trojans share Earth's orbit and have little gravity of their own, less energy might be needed to reach them than the Moon, even though they are much ...
Unusual Earth-associated orbit 2004 FH: 0.030: March 15, 2004: Discovered before it approached within 43,000 km of Earth on March 18, 2004. 2008 TC 3 ~0.003: October 6, 2008: First Earth-impactor to be spotted before impact (on October 7, 2008) (706765) 2010 TK 7 ~0.3: October 2010: First Earth trojan to be discovered 2014 RC ~0.017: September ...
Amor asteroids are further subdivided into four subgroups, depending on where their semimajor axis falls between Earth's orbit and the asteroid belt. Earth trojans, asteroids sharing Earth's orbit and gravitationally locked to it. As of 2022, two Earth trojans are known: 2010 TK 7 and 2020 XL 5. [14]
Earth Day has been around since the '70s. Every year, over a billion people get involved with the initiatives. Here, learn surprising Earth Day facts.
(614689) 2020 XL 5 (provisional designation 2020 XL 5) is a near-Earth asteroid and Earth trojan discovered by the Pan-STARRS 1 survey at Haleakala Observatory, Hawaii on 12 December 2020. It oscillates around the Sun – Earth L 4 Lagrangian point (leading 60°), one of the dynamically stable locations where the combined gravitational force ...