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Great Comet of 1680
C/1680 V1, also called the Great Comet of 1680, Kirch's Comet, and Newton's Comet, has the distinction of being the first comet discovered by telescope.
==Overview==
The comet was discovered by Gottfried Kirch on 14 November 1680, New Style, and became one of the brightest comets of the 17th century – reputedly visible even in daytime – and was noted for its spectacularly long tail.〔(【引用サイトリンク】 title=The Great Comet of 1680 )〕 Passing 0.42 AUs from Earth on 30 November 1680,〔 it sped around an extremely close perihelion of on 18 December 1680, reaching its peak brightness on 29 December as it swung outwards.〔(【引用サイトリンク】title=JPL DASTCOM Comet Orbital Elements )〕 It was last observed on 19 March 1681.〔 the comet was about 253 AU from the Sun.〔NASA (JPL HORIZONS ephemeris ) more accurate position, no plot.〕
While the Kirch Comet of 1680–1681 was discovered by—and subsequently named for—Gottfried Kirch, credit must also be given to Eusebio Kino, the Spanish Jesuit priest who charted the comet’s course. During his delayed departure for Mexico, Kino began his observations of the comet in Cádiz in late 1680. Upon his arrival in Mexico City, he published his ''Exposisión () astronómica de el cometa'' (Mexico City, 1681) in which he presented his findings. Kino’s ''Exposisión astronómica'' is among the earliest scientific treatises published by a European in the New World.〔H. E. BOLTON. ''Kino’s Historical Memoir of the Pimería Alta''. Cleveland, OH (USA): Arthur H. Clark, 1919. Reprint 1949.〕
Although it was undeniably a sungrazing comet, it was probably not part of the Kreutz family.〔(【引用サイトリンク】 title=A SOHO and Sungrazing Comet FAQ )〕 Aside from its brilliance, it is probably most noted for being used by Isaac Newton to test and verify Kepler's laws. This is actually ironic considering John Flamsteed was the first to propose that the two bright comets of 1680/1681 were the same comet, one travelling inbound to the Sun and the other outbound, and Newton originally disputed this. Newton later changed his mind, however, and then, with Edmond Halley's help, purloined some of Flamsteed's data to indeed verify this was the case without giving Flamsteed credit.〔
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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