NASAのインスタグラム(nasa) - 3月15日 00時38分

Happy Pi Day! Our Cassini spacecraft uses "pi transfer" to navigate path around Saturn. On Jan. 19, 2007, the Cassini spacecraft took this view of Saturn and its rings -- the visible documentation of a technique called a "pi transfer" completed with a Titan flyby. A pi transfer uses the gravity of Saturn's largest moon, Titan, to alter the orbit of the Cassini spacecraft so it can gain different perspectives on Saturn and achieve a wide variety of science objectives. During a pi transfer, Cassini flies by Titan at opposite sides of its orbit about Saturn (i.e., Titan's orbital position differs by pi radians between the two flybys) and uses Titan's gravity to change its orbital perspective on the ringed planet.

Image Credit: NASA/JPL/Space Science Institute

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