A.S.I. - Agenzia Spaziale Italiana - The road to Space goes through Italy.

11 Apr 2008

The Cassini international team is extending the itinerary of the Cassini-Huygens mission by two years. The historic traveler's stunning discoveries and images have revolutionized our knowledge of Saturn and its moons.

Cassini's mission had originally been scheduled to end in July 2008. The newly-announced two-year extension will include 60 additional orbits of Saturn. The extended tour allows for additional flybys of Saturn's exotic moons, 26 of Titan, seven of Enceladus, and one each of Dione, Rhea and Helene. The plan also includes studies of Saturn's rings, its complex magnetosphere, and the planet itself.

"This extension, said the ASI - Program Manager of Cassini-Huygens, Enrico Flamini, is the natural consequence of the extraordinary results we are obtaining in this fantastic mission".

Based on findings from Cassini, scientists believe liquid water may be just beneath the surface of Saturn's moon Enceladus. That's why the small moon, only one-tenth the size of Titan and one-seventh the size of Earth's moon, is one of the highest-priority targets for the extended mission.

Cassini discovered geysers of water-ice jetting from the Enceladus' surface. The geysers, which shoot out at a distance three times the diameter of Enceladus, feed particles into Saturn's most expansive ring. In the extended mission, the spacecraft may come as close as 15 miles from the moon's surface.

Cassini's observations of Saturn's largest moon, Titan, have given scientists a glimpse of what Earth might have been like before life evolved. They now believe Titan possesses many parallels to Earth, including lakes, rivers, channels, dunes, rain, snow, clouds, mountains and possibly volcanoes.

Unlike Earth, Titan's lakes, rivers and rain are composed of methane and ethane, and temperatures reach a chilly minus 290 degrees Fahrenheit. Although Titan's dense atmosphere limits viewing the surface, Cassini's high-resolution radar coverage and imaging by the infrared spectrometer have given scientists a better look at the surface. Other overtime activities for Cassini scientists will include monitoring the seasons on Titan and Saturn; observing unique ring events, such as the 2009 equinox, when the sun will be in the plane of the rings; and exploring new places within Saturn's magnetosphere. Cassini has returned a daily stream of data from Saturn's system for nearly four years. Its travel scrapbook includes nearly 140,000 images and information gathered during 62 revolutions around Saturn, 43 flybys of Titan and 12 close flybys of the icy moons.

More than 10 years after launch and nearly four years after entering into orbit around Saturn, Cassini is a healthy and robust spacecraft. Three of its science instruments have some minor ailments, but the impact on science-gathering is minimal. The spacecraft will have enough propellant left beyond the extended mission to potentially allow a third phase of operations. Data from the extended mission could lay the groundwork for possible new missions to Titan and Enceladus.

Cassini launched Oct. 15, 1997, from Cape Canaveral, Fla., on a seven-year journey to Saturn, traversing 2.2 billion miles. It is one of the most scientifically capable spacecraft ever launched, with a record 12 instruments on the orbiter and six more instruments on the European Space Agency's Huygens probe, which piggybacked a ride to Titan on Cassini. Cassini receives electrical power from three radioisotope thermoelectric generators, which generate electricity from heat produced by the natural decay of plutonium. The spacecraft was captured into Saturn orbit in June 2004 and immediately began returning data to Earth.

The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency.