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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 Gate orbit ： ウィキペディア英語版 Gate orbit Gate orbits are optimal circular departure orbits for transfer from one planet to another. At certain specific orbits around a cosmic body, the additional delta-''v'' required to go from orbital velocity to hyperbolic trajectory for an interplanetary transfer, is minimal. Gate orbits can therefore be very useful for minimising the delta-''v'' budget for an interplanetary trip. For example, the required delta-''v'' for a Hohmann transfer orbit from the Earth to Mars (considering Earth at 1 AU and Mars at 1.52 AU) is 2.94 km/s. To reach 2.94 km/s at infinity from a low Earth orbit at, say 200 km altitude, requires a 3.61 km/s burn. If the vehicle were to leave the Earth's attraction from the 92,000 km high Mars gate orbit instead, required delta-''v'' would be only 2.08 km/s. At higher still orbits the required delta-''v'' rises again. For example, at 150,000 km, required delta-v is now 2.17 km/s. Reducing the delta-''v'' from 3.61 to 2.08 km/s can reduce the total mass of the vehicle by as much as 38%, or increase the payload by 62%! The radius of a given gate orbit can be calculated using the following equation: :$r\; =$ where: *$r\backslash ,$ is the distance between the orbiting body and the central body, in km *$\backslash mu\backslash ,$ is the standard gravitational parameter, in km3s−2 *$v\_\backslash infty\backslash ,$ is the required velocity at infinity, in km·s−1. Remember $v\_\backslash infty^2$ is also known as $C3$ == External links == * (Interplanetary Gate Orbits by Marco Christov ) 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「Gate orbit」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.