| 翻訳と辞書 |
Vanguard 1
Vanguard 1 (ID: 1958-Beta 2
〔
〕) was the fourth artificial Earth orbital satellite launched (after Sputnik 1, Sputnik 2, and Explorer 1). It was the first satellite to be solar powered.〔(Vanguard I the World's Oldest Satellite Still in Orbit ), accessed September 24, 2007〕 Although communication with it was lost in 1964, it remains the oldest manmade satellite still in orbit. It was designed to test the launch capabilities of a three-stage launch vehicle as a part of Project Vanguard, and the effects of the environment on a satellite and its systems in Earth orbit. It also was used to obtain geodetic measurements through orbit analysis. ''Vanguard 1'' was described by then-Soviet Premier Nikita Khrushchev as, "The grapefruit satellite."〔(【引用サイトリンク】 Vanguard I - the World's Oldest Satellite Still in Orbit )〕
== Spacecraft design ==
The spacecraft is a 1.47 kg (3.2 lb) aluminum sphere 165 mm (6.4 inches) in diameter. It contains a 10 mW, 108 MHz transmitter powered by a mercury battery and a 5 mW, 108.03 MHz〔(【引用サイトリンク】title=Project Vanguard Report No. 23 Minitrack Report No. 3, Receiver System )〕 transmitter that was powered by six solar cells mounted on the body of the satellite. Six short antennas protrude from the sphere. The transmitters were used primarily for engineering and tracking data, but were also used to determine the total electron content between the satellite and ground stations. Vanguard also carries two thermistors which measured the interior temperature over sixteen days in order to track the effectiveness of the thermal protection. A backup version of Vanguard 1 is on display at the Smithsonian National Air and Space Museum, Steven F. Udvar-Hazy Center in Chantilly, Virginia.〔(【引用サイトリンク】title=Satellite, Vanguard 1, Backup )〕
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「Vanguard 1」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.
|
|