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Cassini returning Enceladus gravity data

Date:
May 3, 2010
Source:
NASA/Jet Propulsion Laboratory
Summary:
NASA's Cassini spacecraft successfully completed its 26-hour gravity observation at Saturn's moon Enceladus recently, sending back data scientists will use to understand the moon's interior composition and structure.

NASA's Casini spacecraft obtained this raw image of Enceladus on April 26, 2010.
Credit: NASA/JPL/Space Science Institute

NASA's Cassini spacecraft successfully completed its 26-hour gravity observation at Saturn's moon Enceladus recently, sending back data scientists will use to understand the moon's interior composition and structure.

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The flyby took Cassini through the water-rich plume flaring out from Enceladus' south polar region, with a closest approach of about 100 kilometers (60 miles) occurring in the late afternoon of April 27, 2010, Pacific Time, or just after midnight April 28 UTC.

A steady radio link to NASA's Deep Space Network on Earth enabled Cassini's scientists to use the radio science instrument to measure the variations in the gravitational pull of Enceladus. Analyzing the wiggles will help scientists understand whether an ocean, pond or great lake lies under the famous "tiger stripe" fractures that spew water vapor and organic particles from the south polar region.

Results from the experiment will also tell scientists if bubbles of warmer ice in the interior rise toward that region's surface like an underground lava lamp.

Radio science was prime during the flyby and controlled spacecraft pointing. The optical instruments were not pointed at Enceladus during most of the flyby, so the imaging camera obtained some more distant pictures.

Cassini often relies on thrusters to control attitude during flybys such as this one, but this time it turned the thrusters off and relied on its reaction wheels. Using thrusters adds acceleration effects to the spacecraft, complicating the precise measurements needed for the radio science experiment.

The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA's Science Mission Directorate in Washington. The Cassini orbiter was designed, developed and assembled at JPL.

More information about the Cassini-Huygens mission is at: http://www.nasa.gov/cassini and http://saturn.jpl.nasa.gov.


Story Source:

The above story is based on materials provided by NASA/Jet Propulsion Laboratory. Note: Materials may be edited for content and length.


Cite This Page:

NASA/Jet Propulsion Laboratory. "Cassini returning Enceladus gravity data." ScienceDaily. ScienceDaily, 3 May 2010. <www.sciencedaily.com/releases/2010/04/100430111111.htm>.
NASA/Jet Propulsion Laboratory. (2010, May 3). Cassini returning Enceladus gravity data. ScienceDaily. Retrieved December 21, 2014 from www.sciencedaily.com/releases/2010/04/100430111111.htm
NASA/Jet Propulsion Laboratory. "Cassini returning Enceladus gravity data." ScienceDaily. www.sciencedaily.com/releases/2010/04/100430111111.htm (accessed December 21, 2014).

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