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The Perseids are a prolific meteor shower associated with the comet Swift–Tuttle. The Perseids are so called because the point from which they appear to come, called the radiant, lies in the constellation Perseus. The name derives in part from the word Perseides (Περσείδες), a term found in Greek mythology referring to the sons of Perseus. The stream of debris is called the Perseid cloud and stretches along the orbit of the comet Swift–Tuttle. The cloud consists of particles ejected by the comet as it travels on its 133-year orbit. Most of the particles have been part of the cloud for around a thousand years. However, there is also a relatively young filament of dust in the stream that was pulled off the comet in 1865, which can give an early mini-peak the day before the maximum shower. The dimensions of the cloud in the vicinity of the Earth are estimated to be approximately 0.1 astronomical units (AU) across and 0.8 AU along the latter’s orbit, spread out by annual interactions with the Earth’s gravity. The shower is visible from mid-July each year, with the peak in activity between 9 and 14 August, depending on the particular location of the stream. During the peak, the rate of meteors reaches 60 or more per hour. They can be seen all across the sky; however, because of the shower’s radiant in the constellation of Perseus, the Perseids are primarily visible in the Northern Hemisphere. As with many meteor showers the visible rate is greatest in the pre-dawn hours, since more meteoroids are scooped up by the side of the Earth moving forward into the stream, corresponding to local times between midnight and noon, as can be seen in the accompanying diagram.〔http://meteorshowersonline.com/what_is.html〕 While many meteors arrive between dawn and noon, they are usually not visible due to daylight. Some can also be seen before midnight, often grazing the Earth’s atmosphere to produce long bright trails and sometimes fireballs. Most Perseids burn up in the atmosphere while at heights above .〔 ==Historical observations and associations== The earliest information on this meteor shower is found in Chinese annals in A.D. 36. In Roman times the shower was attributed to the fertility god Priapus, protector of virility but also of livestock, orchards, and gardens; the meteor shower was nothing more than an ejaculation of the god that fertilized the fields. According to Plutarch in "De cupiditate Divitiarum", each year on August 10 a grand procession took place to honor Priapus and the fields were "baptized" with a mixture of water, honey, and wine to ensure the land’s fertility. Priapus was associated with Pan, Dionysus, Lupercus, Faunus, and the Etruscan divinity Acca Larentia, protectress of the poor, prostitutes, and agricultural fertility. 〔 (The cult of Priapus )〕 Some Catholics refer to the Perseids as the "tears of Saint Lawrence", suspended in the sky but returning to earth once a year on August 10, the canonical date of that saint's martyrdom in 258 AD. The saint is said to have been burnt alive on a gridiron, and this tradition is almost certainly the origin of the Mediterranean folk legend that the shooting stars are the sparks of that fire and that during the night of August 9–10 its cooled embers appear in the ground under plants, and which are known as the "coal of Saint Lawrence".〔 (Falling stars and coal under the basil )〕〔 (The Coal of Saint Lawrence )〕 The transition in favor of the Catholic saint and his feast day on August 10 and away from pagan gods and their festivals, known as Christianization, was facilitated by the phonetic assonance of the Latin name Laurentius with Larentia.〔 (Castrum Inui )〕 In 1835 Adolphe Quetelet identified the shower as emanating from the constellation Perseus.〔 In 1866, after the perihelion passage of Swift-Tuttle in 1862, the Italian astronomer Giovanni Virginio Schiaparelli discovered the link between meteor showers and comets. The finding is contained in an exchange of letters with Angelo Secchi. 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「Perseids」の詳細全文を読む スポンサード リンク
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