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The spacecraft adjusted its orbit to align the apse line with the planet's shadow for a gravity-assist maneuver.
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The spacecraft adjusted its orbit to align the apse line with the planet's shadow for a gravity-assist maneuver.
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Noun
Japanese Meaning
天文学において、軌道の離心率ベクトルによって定義される仮想の直線のこと。楕円軌道では近点と遠点（大軸と呼ばれる）を結び、放物線や双曲線軌道では近点と焦点を結ぶ線となる。
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