...In this case, if two nights of observations are available, we can assume that the orbit is circular and determine whether it is a circular orbit. In a circular orbit, the eccentricity e is 0, and there is no need to determine the perihelion argument ω, so the orbital elements to be determined are the semimajor axis a , the orbital inclination i , the ecliptic longitude Ω of the ascending node, and the latitude argument of the celestial body at the epoch (the angular distance from the ascending node to the celestial body) instead of the date and time of the perihelion passage. Therefore, two nights of observation data (dates t 1 and t 2 ) of α 1 , δ 1 , α 2 , and δ 2 are sufficient. ... *Some of the terminology explanations that mention the "latitude argument" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…このとき,もし2夜の観測があれば軌道の形を円と仮定して円軌道を決めることができる。円軌道では離心率eは0であり,近日点引数ωは求める必要がないので,決定すべき軌道要素は,軌道の半長径a,軌道傾斜i,昇交点黄経Ω,そして近日点通過の日時の代りに元期における天体の緯度引数(昇交点から天体までの角距離)の4個となる。したがって2夜(日時t1,t2)の観測データα1,δ1,α2,δ2があれば十分である。… ※「緯度引数」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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