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This is a list of comets (bodies that travel in elliptical, parabolic, and sometimes hyperbolic orbits and display a tail behind them) listed by type. Comets are sorted into four categories: periodic comets (e.g. Halley's Comet), non-periodic comets (e.g. Comet Hale–Bopp), comets with no meaningful orbit (the Great Comet of 1106), and lost comets (5D/Brorsen), displayed as either P (periodic), C (non-periodic), X (no orbit), and D (lost). Many of the earlier comets to be observed in history are designated with an X or D due to not having the tools to measure a comet's orbit accurately and eventually losing it. X/1106 C1 (the Great Comet of 1106) is a good example. The orbital elements for the older non-periodic comets in the list assume that the comet has an eccentricity of roughly 1, and therefore the calculations are only approximate. ==Guide to comet lists== *Comets that are hyperbolic or parabolic—hyperbolic comet list *Comets that have a period of over 1000 years—near-parabolic comet list *Comets with a period between 200 and 1000 years—long-period comet list *Unnumbered comets with a period of less than 200 years—List of periodic comets *Numbered comets—List of numbered comets *Sungrazing comets—sungrazers list *Kreutz sungrazers—Kreutz Sungrazers list *Meyer group—Meyer group list *Kracht group—Kracht group list *Marsden group—Marsden group list After Edmond Halley recognized that several apparitions of a comet every 75.3 years dating back to 239 BC were the same comet, it gave way to a new designation of periodic comets, with the first being named 1P/Halley. To date, there are 294 of these periodic comets, with many more on the way to getting an official designation. Here is a list of periodic comets with a cometary designation: 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「List of comets by type」の詳細全文を読む スポンサード リンク
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