Artist's impression of Ulysses

Ulysses

The first probe to fly over the Sun's poles was the joint European-US Ulysses, launched aboard the space shuttle in 1990.

The spacecraft returned data about the solar wind and the magnetic field around the polar regions until its mission ended in 2009.

Photo: Artist's impression of Ulysses (ESA)

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Artist's impression of Ulysses

About Ulysses

A European probe flies over the Sun's poles.

About Ulysses

Ulysses is a decommissioned robotic space probe whose primary mission was to orbit the Sun and study it at all latitudes. It was launched in 1990, studied the Sun in 1994/1995 and then once more in 2000/2001. In addition several comets were studied by the probe. The space probe was a joint venture of NASA and the European Space Agency (ESA). The last day for mission operations on Ulysses was June 30, 2009.

To study the Sun at all latitudes the probe needed to change its orbital inclination and leave the plane of the Solar System – to change the orbital inclination of a spacecraft a large increase in velocity is needed. However the necessary amount of velocity change to achieve a high inclination orbit of about 80° exceeded the capabilities of the designated launch vehicle, the Space Shuttle plus an Inertial Upper Stage (at that time it was desired to launch all space probes with the Shuttle). Therefore to reach the desired orbit around the Sun a gravity assist manoeuvre around Jupiter was chosen, but this Jupiter encounter meant that Ulysses could not be powered by solar cells – the probe instead was powered by a radioisotope thermoelectric generator (RTG).

The spacecraft was originally named Odysseus, because of its lengthy and indirect trajectory to near Solar distance. It was renamed Ulysses, the Latin translation of "Odysseus" at ESA's request in honour not only of Homer's mythological hero but also with reference to Dante's description in Dante's Inferno.Ulysses was originally scheduled for launch in May 1986 aboard the Space Shuttle Challenger on STS-61-F. Due to the loss of Challenger, the launch of Ulysses was delayed until October 6, 1990 aboard Discovery (mission STS-41).

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