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Each NASA space shuttle designation is composed of a prefix and suffix separated by a dash. The prefix for operational shuttles is OV, for Orbiter Vehicle. The suffix is composed of two parts: the series and the vehicle number. Series: * 0 - Non-flight ready shuttles * 1 - Flight ready shuttles The vehicle number is sequentially assigned within the series, beginning with 1. Therefore, there can never be an OV-100 as it would read "Orbiter Vehicle Series 1 Vehicle 0". Many proposals to build a second generation of orbiters, externally compatible with the current system but internally new, refer to them as "OV-200" or "OV-2xx" in order to differentiate them from the "current generation", the OV-100s. This terminology is informal, and it is unlikely that any Shuttle-derived vehicle built will be given such designation. ==Orbiter Designations== *OV-099 - Space Shuttle ''Challenger'', originally STA-099 *OV-101 - Space Shuttle ''Enterprise'' *OV-102 - Space Shuttle ''Columbia'' *OV-103 - Space Shuttle ''Discovery'' *OV-104 - Space Shuttle ''Atlantis'' *OV-105 - Space Shuttle ''Endeavour'' ''Challenger'' was originally intended to be used as a Structural Test Article, rather than a flight-capable orbiter; as such, the numbering was changed when she was rebuilt. ''Enterprise'', on the other hand, was intended to be rebuilt into a flight-capable orbiter; it was found to be cheaper to rebuild STA-099 than OV-101, so she remained unflown. The designations were not altered, despite these changes in plans. 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「Orbiter Vehicle Designation」の詳細全文を読む スポンサード リンク
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