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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 Eccentricity vector ： ウィキペディア英語版 Eccentricity vector In celestial mechanics, the eccentricity vector of a Kepler orbit is the vector that points towards the periapsis and has a magnitude equal to the orbit's scalar eccentricity. The magnitude is unitless. For Kepler orbits the eccentricity vector is a constant of motion. Its main use is in the analysis of almost circular orbits, as perturbing (non-Keplerian) forces on an actual orbit will cause the osculating eccentricity vector to change continuously. For the eccentricity and argument of periapsis parameters, eccentricity zero (circular orbit) corresponds to a singularity. ==Calculation== The eccentricity vector $\backslash mathbf\; \backslash ,$ is: :$\backslash mathbf\; =\; \backslash over\}\; -\; \backslash right|\}\}\; =$ \left ( }- } \right ) \mathbf - \over} \mathbf which follows immediately from the vector identity: :$\backslash mathbf\backslash times\; \backslash left\; (\; \backslash mathbf\backslash times\; \backslash mathbf\; \backslash right\; )\; =\; \backslash left\; (\; \backslash mathbf\; \backslash cdot\; \backslash mathbf\; \backslash right\; )\; \backslash mathbf\; -\; \backslash left\; (\; \backslash mathbf\; \backslash cdot\; \backslash mathbf\; \backslash right\; )\; \backslash mathbf$ where: *$\backslash mathbf\backslash ,\backslash !$ is velocity vector *$\backslash mathbf\backslash ,\backslash !$ is specific angular momentum vector (equal to $\backslash mathbf\backslash times\backslash mathbf$) *$\backslash mathbf\backslash ,\backslash !$ is position vector *$\backslash mu\backslash ,\backslash !$ is standard gravitational parameter 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「Eccentricity vector」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.