asteroid (minor planet) - asteroid (minor planet).
A small planetary body of the Solar System (average values of eccentricity and inclination are 0.15 and 9.7°, respectively). More than 1800 asteroids have been catalogued, and there are millions more smaller ones, but their total mass seems to be less than 3% of the mass of the Moon. The densities of asteroids are poorly known (about 2.6 g/cm), but it is assumed that their composition is close to that of carbonaceous chondrites. It is likely that bright asteroids are independent condensations, while those that are weaker than the 14th or 15th magnitude were formed as a result of collisions. Orbits of asteroids and short-period comets
have some similarities.
Trojan asteroids are a group of asteroids located in the vicinity of the Lagrange points L4 and L5 in the 1:1 orbital resonance of any planets.
The first asteroids of this type were discovered near Jupiter. These asteroids are named after characters from the Trojan War described in the Iliad.
In addition to the Trojans of Jupiter, the Trojans of Mars, Neptune, Uranus and the Earth are known.
Trojan asteroids of the Earth
The Trojan asteroids of the Earth are a hypothetical group of asteroids located near the Lagrange points L4 and L5 of the Earth-Sun system and, thus, moving around the Sun along the Earth's orbit 60° ahead (L4) or behind (L5) it. When viewed from the Earth, they would be located in the sky 60 ° behind or in front of the Sun.
Initially, several asteroids were discovered moving in a 1:1 resonance with the Earth, for example, (3753) Cruitney. Such asteroids are not Trojan, because they do not move at the Lagrange points L4 and L5.
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