The comet's orbit

The comet's orbit is an ellipse, parabola, hyperbola three.

Elliptical orbit of the comet also known periodic comet, the other two tracks is also called non-period comets. Periodic comet is divided into short-period comets, and the long-period comets. The general comet by the comet head and tail. The comet head containing the nucleus and coma two parts, and some even coma cloud. Not all comet has a nucleus, coma, tail structure. Ancient China to the morphology of the comet has a great deal of research in the Western Han tombs unearthed in Mawangdui silk manuscripts on painting 29 comets plans. Jin astronomical annals clearly shows that the comet will not shine due to reflected sunlight, as we have seen, and the tail of a comet in the direction away from the sun. Of a large body of the comet, but its quality is pitifully small, and even the the large comet quality is not the ten-thousandth of the Earth. Since comets are frozen with various impurities, dust, away from the sun, it's just a small cloudy spots; close to the sun, due to the evaporation of the solidified body, gasification, swelling, eruption, it on the tail of a comet. Tail volume dramatically, up to hundreds of millions of kilometers. It shapes, some of the more than one's general extends to deviate from the direction of the sun, and closer to the sun tail longer. The great number of comets in the universe, but observed only about 1600. Very different from the comet's orbit, the orbit of the planet, it is very flat oval, some even parabolic or hyperbolic orbits. Comet of the orbit is elliptical regularly return to the sun around, called a periodic comet; comet orbit is parabolic or hyperbolic, life can only close to the sun once Once departed, never to return, referred to as non-periodic comet type of comet perhaps originally not a solar system members, they are just from outside our solar system passing accidentally broke into the solar system, and later hesitate to return to the vast depths of the universe. The cycle is divided into short-period comets (orbital period shorter than 200 years around the sun) and long-period (orbital period of over 200 years around the sun) comet.
Has calculated more than 600 comets orbit. Comet's orbit may be affected by the influence of the planets, produce changes. When the comet by planetary impact of accelerated, its orbit will become flat, and even become parabolic or hyperbolic, so that the comet from the solar system;, the eccentricity of the orbit will be smaller when the deceleration of the comet, so that the long-period comets change for short-period comets, even from non-periodic comet becomes periodic comet so capture.