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Last Close Cassini Flyby of Saturn's Moon Rhea





NASA's Cassini spacecraft will be swooping close to Saturn's heavily-cratered moon, Rhea, on Saturday, March 9, the last close flyby of Rhea to probe the internal structure of the moon by measuring the gravitational pull of Rhea against the spacecraft's steady radio link to NASA's Deep Space Network here on Earth. The results will help scientists understand whether the moon is homogeneous all the way through or whether it has differentiated into the layers of core, mantle and crust.

In addition, Cassini's imaging cameras will take ultraviolet, infrared and visible-light data from Rhea's surface. The cosmic dust analyzer will try to detect any dusty debris flying off the surface from tiny meteoroid bombardments to further scientists' understanding of the rate at which "foreign" objects are raining into the Saturn system. * Cassini will fly within about 600 miles (1,000 kilometers) of the surface. The time of closest approach is around 10:17 a.m. PST (1:17 p.m. EST).

This is Cassini's fourth close flyby of Rhea. On Feb. 10, 2015, Cassini will pass Rhea at about 29,000 miles (47,000 kilometers), but this is not considered a targeted flyby. Cassini has been in orbit around Saturn since 2004 and is in a second mission extension, known as the Solstice mission.

The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. NASA's Jet Propulsion Laboratory manages the mission for NASA's Science Mission Directorate, Washington, D.C. JPL is a division of Caltech.




The Daily Galaxy via JPL/NASA

Image credit: NASA/JPL-Caltech/Space Science Institute


That's incredibly close in cosmic terms! It's nice to see the organizations working together.

Enjoyed every word.

This is Cassini's fourth close flyby of Rhea. On Feb. 10, 2015, Cassini will pass Rhea at about 29,000 miles.

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