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A heliocentric orbit (also called circumsolar orbit) is an orbit around the barycenter of the Solar System, which is usually located within or very near the surface of the Sun. All planets, comets, and asteroids in our Solar System are in such orbits, as are many artificial probes and pieces of debris. The moons of planets in the Solar System, by contrast, are not in heliocentric orbits as they orbit their respective planet. The barycenter of the Solar system, while always very near the Sun, moves through space as time passes depending on where other large bodies in the solar system, such as Jupiter and other large gas planets, are located at that time. A similar phenomenon allows the detection of extrasolar planets by way of the radial velocity method. The ''helio-'' prefix is derived from the Greek word ''helios'', meaning "sun", and also Helios, the personification of the Sun in Greek mythology.〔 〕 The first spacecraft to be put in a heliocentric orbit is Luna 1, which was planned to go to the moon but instead missed due to an incorrectly timed upper stage burn. == See also == * Earth's orbit * Geocentric orbit * Heliocentrism * List of artificial objects in heliocentric orbit * List of orbits 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Heliocentric orbit」の詳細全文を読む スポンサード リンク
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