NASAの動画で見る木星と探査機ジュノーの全て 第8話【The Story – EARTH FLYBY】

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The Story – EARTH FLYBY:ジュノーが地球でフライバイ!木星に向かう

第8話 Deploy The Craft(オリジナル英文URL)


After traveling in space for two years, Juno swings by Earth once more, in October 2013. It will use Earth’s gravity to help propel itself toward Jupiter – a maneuver sometimes called a gravitational slingshot.


When a spacecraft flies near a planet, both objects feel each other’s gravitational pull. But because a spacecraft is so much smaller, it feels a big tug while the massive planet hardly feels a thing. During the Earth flyby, called a gravity assist, Juno steals a tiny bit of our planet’s enormous momentum in its orbit around the sun, giving the spacecraft enough energy to reach beyond the asteroid belt and travel all the way to Jupiter.

When Juno launched, there was not an available rocket powerful enough to send such a heavy spacecraft directly Jupiter, so the flyby maneuver is an essential part of the mission. The Atlas V rocket provided half of the boost Juno needs to reach Jupiter, and the Earth flyby provides the rest. It’s the energy of an extra rocket launch, without the extra rocket.
ジュノーが打ち上げられたとき、重い探査機を木星に直接送れるほど強力なロケットはありませんでしたので、フライバイを用いた航海方法はミッションに不可欠なものでした。 Atlas Vロケットはジュノーが木星に到達するために必要なブーストの半分を提供し、地球によるフライバイが残りを提供します。特別ロケットを用いない特別ロケット加速のエネルギーとなる技術です。

The flyby is also important because it acts as a rehearsal for the Juno team to test the instruments and practice certain operations at Earth before the real thing at Jupiter. After its brief visit, Juno will cruise for three more years, receiving routine checkup calls from engineers. The spacecraft will report its health status at least once a week and engineers will turn on and test its science instruments at least once a year.

During its flyby rendezvous, Juno will spend about 20 minutes within Earth’s shadow – the only eclipse Juno ever experiences after launch. At closest approach, the spacecraft will come within 350 miles (560 kilometers) of Earth’s surface.





第1話 Origin:太陽系の成り立ちと木星のもつ意味 最初に戻ります。

第7話 The Story – Deploy the craft:ジュノーの旅の始まり 前話に戻ります。

第9話 The Story – Orbit:感動のジュノー木星軌道到達! に続きます。

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