Cassini's Hydrazine-fueled Rocket Thrusters

Cassini has four clusters of four rocket thrusters. Each contains an electrically heated catalyst that causes the hydrazine propellent to decompose explosively when it is injected into the thruster, providing about 1 Newton of thrust.

The four hydrazine Thruster Clusters (4 thrusters on each) can be seen at the lower part of the illustration below, which shows the entire Cassini Propulsion Module Subsystem. The hydrazine tank that feeds them is visible mid-right.

The thrusters are often used in managing the spacecraft's attitude (orientation) and, infrequently, for providing small velocity changes to the spacecraft.

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Propulsion Systems in the Basics of Space Flight