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An Earth trojan is an asteroid that orbits the Sun in the vicinity of the Earth–Sun Lagrange points L 4 (leading 60°) or L 5 (trailing 60°), thus having an orbit ...
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 ...
There are 28 known Neptunian trojans, [11] but the large Neptunian trojans are expected to outnumber the large Jovian trojans by an order of magnitude. [12] [13] 2010 TK 7 was confirmed to be the first known Earth trojan in 2011. It is located in the L 4 Lagrangian point, which lies ahead of the Earth.
Earth trojan; 0–9 (614689) 2020 XL5 (706765) 2010 TK7 This page was last edited on 25 December 2017, at 23:49 (UTC). Text is available under the Creative Commons ...
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Earth trojans, such as 2010 TK 7, are NEOs that orbit the Sun (not Earth) on the same orbital path as Earth, and appear to lead or follow Earth along the same orbital path. Other small natural objects in orbit around the Sun may enter orbit around Earth for a short amount of time, becoming temporary natural satellites.
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]
(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 ...