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Cassini-Huygens Periapsis Raising Manoeuvre
Paris (ESA) Aug 25, 2004 The Cassini-Huygens spacecraft has successfully performed its scheduled Periapsis Raising Manoeuvre (PRM). A 51 minute burn of the primary engine corrected the spacecraft trajectory to place it on a course to encounter Saturn's largest moon, Titan, in October. The manoeuvre also raised the periapsis (point of closest approach to Saturn) by over 400 000 km. If left in this orbit the spacecraft would not encounter Titan with the correct velocity to make further orbital changes for the successful deployment of the Huygens probe, and would return to a periapsis point 20 000 km above Saturn's cloud tops and also a second ring plane crossing. The PRM was performed when Cassini-Huygens was near the outer point in its orbit at about 9 million kilometers from Saturn. Here the orbital velocity had reduced to a mere 325 ms-1 compared to the 30 000 ms-1 after the SOI engine burn on 30 June. The new periapsis is located in the safe, tenuous outer regions of Saturn's E-ring instead of only 20 000 km above Saturn's cloud tops. This periapsis is of little significance because the Titan encounter on 26 October, at an altitude of only 1200 km, will change the orbital parameters again.
Titan Encounters During the first three orbits around Saturn (Orbit A, B and C) Cassini-Huygens will make three encounters with Titan. The Huygens probe will be released on 25 December 2004 to descend in Titan's atmosphere on 14 January 2005. Community Email This Article Comment On This Article Related Links Cassini at JPL Cassini Image Team Cassini at ESA SpaceDaily Search SpaceDaily Subscribe To SpaceDaily Express Explore The Ring World of Saturn and her moons Jupiter and its Moons The million outer planets of a star called Sol News Flash at Mercury
Cassini Images Halo Around Titanic Moon Off Saturn
Pasadena CA (SPX) Dec 27, 2005With its thick, distended atmosphere, Titan's orange globe shines softly, encircled by a thin halo of purple light-scattering haze. |
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