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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Southern Delta Aquariids ： ウィキペディア英語版 Southern Delta Aquariids The Southern Delta Aquariids〔IMO (Meteor Shower Calendar 2009 )〕 are a meteor shower visible from mid July to mid August each year with peak activity on July 28 or 29 July. The shower originated from the breakup of what are now the Marsden and Kracht Sungrazing comets. The Delta Aquariids get their name because their radiant appears to lie in the constellation Aquarius, near one of the constellation's brightest stars, Delta Aquarii. The name derives from the Latin possessive form "Aquarii", whereby the declension "-i" is replaced by "-ids" (hence Aquariids with two i's). There are two branches of the Delta Aquariid meteor shower, Southern and Northern. The Southern Delta Aquariids are considered a strong shower, with an average meteor observation rate of 15–20 per hour, and a peak zenith hourly rate of 18. The average radiant is at RA=339°, DEC=−17°. The Northern Delta Aquariids are a weaker shower, peaking later in mid August, with an average peak rate of 10 meteors per hour and an average radiant of RA=340°, DEC=−2°. == History == Observations of the (then unidentified) Delta Aquariids (δ Aquariids) were recorded by G. L. Tupman in 1870, who plotted 65 meteors observed between July 27 and August 6. He plotted the radiant's apparent beginning and ending points (RA=340°, DEC=−14°; RA=333°, DEC=−16°). This was corrected later. Ronald A. McIntosh re-plotted the path, based on a greater number of observations made from 1926 to 1933. He determined it to begin at RA=334.9°, DEC=−19.2° and end RA=352.4°, DEC=−11.8°. Cuno Hoffmeister and a team of German observers were the first to record the characteristics of a Northern Aquariid radiant within the stream around 1938. And Canadian D. W. R. McKinley observed both branches in 1949, but did not associate the two radiants.〔http://meteorshowersonline.com/showers/delta_aquarids.html〕 That was accomplished by astronomer Mary Almond, in 1952, who determined both accurate velocity and orbit of the d Aquariids. She used a "more selective beamed aerial" (echo radio) to identify probable member meteors and plotted an accurate orbital plane. Her paper reported it as a broad "system of orbits" that are probably "connected and produced by one extended stream." This was confirmed in the 1952–1954 Harvard Meteor Project, via photographic observation of orbits. The Project also produced the first evidence that the stream's evolution was influence by Jupiter.〔 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「Southern Delta Aquariids」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.