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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 BSTAR ： ウィキペディア英語版 BSTAR BSTAR is a way of modeling aerodynamic drag on a satellite in the SGP4 satellite orbit propagation model. Traditionally, aerodynamic resistance ("drag") is given by :$F\_D\; =\; \backslash frac\; \backslash rho\; C\_d\; A\; v^2$ where $\backslash rho$ is the air density, $C\_d$ is the drag coefficient, $A$ is the frontal area, and $v$ is the velocity. The acceleration due to drag is then :$a\_D\; =\; \backslash frac\; =\; \backslash frac$ In aerodynamic theory, the factor :$B\; =\; \backslash frac$ is called the ballistic coefficient, and its unit is area per mass. Further incorporating air density and the factor of two in the denominator, we get the ''starred'' ballistic coefficient: :$B^$ * = \frac = \frac thus reducing the expression for the acceleration due to drag to :$a\_D\; =\; B^$ * v^2 As it can be seen, $B^$ * has a unit of inverse length. For orbit propagation purposes, there is a field for BSTAR drag in Two-line element set (TLE) files, where it is to be given in units of inverse Earth radii. ==References== # (Frequently Asked Questions: Two-Line Element Set Format ) # (BSTAR Drag Term ) 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「BSTAR」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.