Troy group asteroids are associated withJupiterShare the track, circle togethersunlightA large group of asteroids in motion.Fixed fromJupiterAccording to the coordinate system on theLagrange pointThe two stable points are located at 60 degrees in front (L4) and behind (L5) of Jupiter's orbit.
According to the original specification,Trojan asteroids Track ofSemimajor axisIs between 5.05 and 5.40Astronomical unit, and on bothLagrange pointWithin an arc area of.This standard now also applies to similar cases of other celestial bodies, where the main celestial bodies will be marked.For example: NeptuneTrojan asteroids 2001 QR322。
In 2006, HawaiiKeck Observatory A group ofTrojan asteroids It may be a double star.cometorKuiper beltCelestial bodies are also possible objects in terms of size and composition (ice and surrounding dust).In the future, they may be the main onesAsteroid beltCelestial bodies.
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Edward Emerson Barnard is believed to be the first person to observe the Troy asteroid.In 1904, no one noticed his observation at that time, but thought that what he observed wasSaturn's satelliteIapetus(Phoebe), because at that time, the distance between the two in the sky was only two minutes of arc, or just onefixed star。Barnard's observation was not taken seriously until the Trojanian asteroid (12126) 1999 RM11 was discovered and its orbit was confirmed again in 1999.But it is probably only historians who are interested in confirming which celestial body Barnard saw.
In February 1906, German astronomersMax Wolf (Max Wolf) found asunlight-JupiterOfLagrange pointOn L4asteroid, laterHomerIn the mythical story, Achilles, the hero of Iliad, was named (588) Achilles, who showed abnormal orbital motion within a few months, and soon after, many other asteroids were also found near this point (including the sun-JupiterAnother of the systemLagrange pointL5）。
As of September 2007, 2239 Trojanian asteroids had been confirmed, 1192 of which were at L4 and 1047 at L5. In October 1999, the total number of Trojanian asteroids was 177, 877 in July 2004, 1826 in August 2005 and 2049 in June 2006.In addition, there are 6 in the orbit of Neptune and 4 in the orbit of Mars.maximalTrojan asteroids It is (624) Hektor, measured 370km long and 195km wide.There is no doubt that there are many smaller celestial bodies that cannot be seen with current instruments.
On October 16, 2021, NASA's "Lucy" space probe was launched from Cape Canaveral Air Force Base in Florida, the United States. It will start a 12 year space journey and will explore the trojan asteroid group running in the orbit of Jupiter for the first time.[1]
