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Asteroids (864 words) |
 | Asteroids that are on a collision course with Earth are called meteoroids. |
| Because of the perturbing influence of the major planets, the asteroid orbits tend to "wander", and the calculation of whether (or when) a particular object might impact the Earth may require extremely accurate knowledge of the orbit, such as can be provided by radar observations. |
| Asteroids which in this manner draw close to the Earth's orbit are referred to as near Earth objects (NEO), and are considered to pose the danger of potential impact with Earth. |
| Minor planet - Wikipedia, the free encyclopedia (2450 words) |
| Eos asteroids have a semi-major axis between 2.99 AU and 3.03 AU, an eccentricity between 0.01 and 0.13, and an inclination between 8° and 12°. |
| Nysa asteroids have a semi-major axis between 2.41 AU and 2.5 AU, an eccentricity between 0.12 and 0.21, and an inclination between 1.5° and 4.3°. |
| Hilda asteroids have a mean orbital radius between 3.7 AU and 4.2 AU, an eccentricity greater than 0.07, and an inclination less than 20°. |
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