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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. [14] (614689) 2020 XL 5 was found to be another Earth trojan in 2021. It is also at L4. [15] [16] (687170) 2011 QF 99 was identified as the first Uranus trojan in 2013. It is located at the L 4 Lagrangian ...
There are several classes of co-orbital objects, depending on their point of libration. The most common and best-known class is the trojan, which librates around one of the two stable Lagrangian points (Trojan points), L 4 and L 5, 60° ahead of and behind the larger body respectively.
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 similar to Earth's. Only two Earth trojans have so far been discovered.
The name derives from the names that were given to asteroids discovered orbiting at the Sun–Jupiter L 4 and L 5 points, which were taken from mythological characters appearing in Homer's Iliad, an epic poem set during the Trojan War. Asteroids at the L 4 point, ahead of Jupiter, are named after Greek characters in the Iliad and referred to as ...
The Jupiter trojans, commonly called trojan asteroids or simply trojans, are a large group of asteroids that share the planet Jupiter's orbit around the Sun. Relative to Jupiter, each trojan librates around one of Jupiter's stable Lagrange points: either L 4, existing 60° ahead of the planet in its orbit, or L 5, 60° behind.
[4] [5] Trojan objects are most easily conceived as orbiting at a Lagrangian point, a dynamically stable location (where the combined gravitational force acts through the Sun's and Earth's barycenter) 60 degrees ahead of or behind a massive orbiting body, in a type of 1:1 orbital resonance. In reality, they oscillate around such a point.
The existence of high-inclination Neptune trojans points to a capture during planetary migration instead of in situ or collisional formation. [2] [7] The estimated equal number of large L 5 and L 4 trojans indicates that there was no gas drag during capture and points to a common capture mechanism for both L 4 and L 5 trojans. [7]
This is a list of Jupiter trojans that lie in the Greek camp, an elongated curved region around the leading Lagrangian point (L 4), 60° ahead of Jupiter in its orbit.. All the asteroids at Jupiter's L 4 point have names corresponding to participants on the Greek side of the Trojan War, except for 624 Hektor, which was named before this naming convention was instituted.
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