...The perihelion longitude is sometimes used instead of the perihelion argument (= Ω + ω). In the motion of comets, the perihelion distance q , which is the distance from the perihelion to the Sun, is used instead of the semi-major axis as an orbital element. For periodic comets, the orbital period P is also counted as an orbital element. ... *Some of the terminology that mentions "perihelion distance" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…また近日点引数の代りに近日点黄経を使うこともある(=Ω+ω)。すい星の運動では,軌道要素として半長径の代りに近日点と太陽までの距離である近日点距離qが用いられる。周期すい星では公転周期Pも軌道要素に数えられる。… ※「近日点距離」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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