Huygens probe ready to detach from Cassini mother craft

December 24, 2004
Encircled in purple stratospheric haze, Titan appears as a softly glowing sphere in this colorized image taken one day after Cas

After a seven-year and 3.2 billion km journey from Earth to Saturn, ESA’s Huygens probe, travelling on board NASA’s Cassini mother craft and powered through an umbilical cable, is now ready to separate and continue its journey alone toward Titan, Saturn’s largest moon.
On Christmas night (25 December at 03:00 CET- orbiter time/04:08 CET on the ground) Huygens will be cut loose from Cassini and will coast toward Titan for 20 days, to arrive at its destination on 14 January.

Image: As the NASA/ESA/ASI Cassini-Huygens spacecraft orbits around Saturn, it puts itself on a course to intercept Titan, and prepares to release the Huygens probe. The Cassini-Huygens mission is a co-operative project of NASA, ESA and the Italian Space Agency. Credits: NASA/ESA

“We have the green light for separation. The joint ESA/NASA team has done all that had to be done to be ready for release. We are looking forward to receiving data on 14 January at ESA’s Spacecraft Operations Centre in Darmstadt, Germany.”, said Claudio Sollazzo, ESA’s Head of Huygens Spacecraft Operations Unit at NASA/JPL in Pasadena, California.

At separation, tension-loaded springs will gently push Huygens away from Cassini onto a ballistic 4-million kilometre path to Titan. The Huygens probe will remain dormant until the on-board timer, which has been loaded on 21 December, wakes it up shortly before it reaches Titan's upper atmosphere on 14 January.

“We will then have to wait patiently for the most exciting phase of our mission, when Cassini will send back to Earth the Huygens data. The Huygens descent will be accomplished in less then two and half hours and, if the probe survives the impact with the surface, we could expect up to two extra hours of science results before the onboard batteries die out” said Jean-Pierre Lebreton, ESA’s Huygens Mission Manager and Project Scientist, preparing to follow the separation from NASA/JPL in Pasadena.

At about 1200 km above the surface of Titan, the Huygens probe will begin a dramatic plunge through Titan’s thick haze, with the task to analyze the chemical makeup and composition of the moon’s atmosphere as it descends to touchdown on its surface. With Cassini listening to the probe for 4.5 hours, the data gathered during the descent and on the surface will be transmitted continuously by the probe and recorded onboard the Cassini orbiter.

Cassini will then turn away from Titan and point its antenna to Earth and relay the data through NASA's Deep Space Network to JPL and on to ESA's Space Operations Centre ESOC in Darmstadt, Germany where the Huygens probe data will be analysed by scientists.

After a successful probe release, on 28 December, the Cassini orbiter will perform a deflection manoeuvre to keep it from following Huygens into Titan's atmosphere and to establish the required geometry between the probe and the orbiter for radio communications during the probe’s descent. The Cassini-Huygens mission is a cooperation between NASA, the European Space Agency and ASI, the Italian Space Agency. The Jet Propulsion Laboratory (JPL), a division of the California Institute of Technology in Pasadena, is managing the mission for NASA’s Office of Space Science, Washington.

Source: ESA

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