Cassini-Huygens Periapsis Raising Manoeuvre

SATURN DAILY

A multi billion dollar robot is now in orbit about Saturn and has the capacity to conduct exploration activities for a decade and more.

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.

SATURN DAILY

Cassini On Course For Titan Flyby

Pasadena CA (JPL) Aug 24, 2004
The Cassini spacecraft successfully completed a 51-minute engine burn that will raise its next closest approach distance to Saturn by nearly 300,000 kilometers (186,000 miles). The maneuver was necessary to keep the spacecraft from passing through the rings and to put it on target for its first close encounter with Saturn's moon Titan on Oct. 26.

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