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List of numbered comets
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List of numbered comets : ウィキペディア英語版
List of numbered comets
The following is a list of comets that have been assigned a numeric designation by the Minor Planet Center, having been observed on at least two occasions. Currently there are 314 numbered comets, 293 being Jupiter-family comets, 19 Halley-type comets, one Long-period comet (153P/Ikeya–Zhang), and one Main-belt comet (311P/PANSTARRS). The letter to the left of the forward slash in the designation indicates the comet type, either P (Periodic), C (Non-periodic), X (No orbit) or D (Lost).
A number of the comets on the list had been discovered prior to observations of cometary activity, and were assigned asteroid designation, such as 133P/Elst–Pizarro, which had prior been given the numeric designation 7968. A few, through various reasons, display characteristics of both an asteroid and a comet, such as 95P/Chiron.
Occasionally, comets will break up into smaller chunks, as volatiles coming off the comet may cause it to break into two or more pieces. An extreme example of this is 73P/Schwassmann–Wachmann, which broke into over 50 pieces during its 1995 perihelion.
For a list of unnumbered Jupiter-family and Halley-type comets, see List of periodic comets.
==List==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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