the October 1989 launch to Jupiter. It was shipped to the Kennedy Space Center in May 1989 for pre-launch processing in preparation for the October 1989 launch date. Ulysses Mission The Ulysses mission development was approved in 1979 as a joint project of NASA and the European Space Agency (ESA). Ulysses will investigate, for the first time, a variety of heliopheric phenomena from a polar orbit around the sun, including: • the properties of the solar wind; • the structure of the sun/solar wind interface; • the heliospheric magnetic field; • solar radio bursts; • plasma waves; • solar X-rays; • solar and galactic cosmic rays; and • interstellar/interplanetary neutral gas and dust. Secondary mission objectives are to conduct interplanetary physics investigations during the in-ecliptic Earth-Jupiter phase, to detect cosmic gamma ray bursts and to search for gravitational waves. The Ulysses Spacecraft (Fig. 4) is a spin-stabilized 366 kg spacecraft with a body- fixed high-gain antenna, three science booms and an RTG for spacecraft power. The RTG is necessary because the spacecraft flies to Jupiter (where there is low solar intensity) en route to its out-of-ecliptic journey around the Sun. The Ulysses spacecraft was planned for launch on a Shuttle/Centaur in 1986. The current injection stage is the two-stage IUS with a payload assist module (PAM)-S
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