Oscillating orbit

Japanese: 接触軌道 - せっしょくきどう(英語表記)osculating orbit
Oscillating orbit
The motion of planets and moons is Keplerian motion accompanied by perturbations, and the effects of perturbations are expressed as the time variations of the six parameters (orbital elements) that define Keplerian motion. Therefore, the motion of a celestial body at a certain moment is given by Keplerian motion using the values ​​of the orbital elements at that moment. In this case, the Keplerian orbit at that moment not only shares the same celestial body position as the actual orbit, but is also tangent to the actual orbit at that position, and is called an osculating orbit. [Genichiro Hori]

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
惑星や衛星の運動は摂動を伴うケプラー運動であり,摂動の効果は,ケプラー運動を規定する6個のパラメーター(軌道要素)の時間的変動で表される。したがって,ある瞬間の天体の運動は,その瞬間の軌道要素の値を使ったケプラー運動で与えられる。このとき,その瞬間のケプラー軌道は,実際の軌道と天体位置を共有するだけでなく,その位置で実際の軌道に接していて,接触軌道といわれる。【堀 源一郎】

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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