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Andromedids
The Andromedids meteor shower is associated with Biela's Comet, the showers occurring as Earth passes through old streams left by the comet's tail. The comet was observed to have broken up by 1846; further drift of the pieces by 1852 suggested the moment of breakup was in either 1842 or early 1843, when the comet was near Jupiter.〔〔 The breakup led to particularly spectacular showers in subsequent cycles (particularly in 1872 and 1885).〔〔
In the early 19th century, before the break-up of comet 3D/Biela, the radiant was in Cassiopeia.〔 In the last century the radiant of the modern weaker meteor shower is generally in the constellation of Andromeda as the name of the shower suggests, but due to its age and diffuseness meteors may appear to come from the neighbouring constellations, such as Pisces, Triangulum and Cassiopeia.〔〔
==Historical appearances==
The first known sighting of the Andromedids was December 6, 1741, over St Petersburg, Russia.〔 Further strong showers were witnessed in 1798, 1825, 1830, 1838 and 1847. The Andromedids produced spectacular displays of several thousand meteors per hour in 1872 and 1885, as a result of Earth crossing the comet's debris stream. In Burma, the 1885 shower was perceived as a fateful omen and was indeed followed swiftly by the collapse of the Konbaung dynasty and the conquest by Britain.〔Lonely Planet Myanmar, 10th edition page 256〕
The November 27, 1885, shower was the occasion of the first known photograph of a meteor, taken by Austro-Hungarian astronomer, Ladislaus Weinek, who caught a 7mm-long trail on a plate at his Prague observing station.
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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