Star 27

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A Star-27 kick motor with nozzle for IBEX

The Star 27 is a solid rocket motor for the upper stages of rockets.[1] It burns HTPB fuel with an average erosion rate of 0.0011 inches per second.[2][1] When used on the Pegasus air-launch rocket payloads are capable of leaving Earth orbit.[1] A Star 27 was used in the launch of the IBEX spacecraft.[3] The spacecraft had a mass of 105 kg by itself and together with its Star 27 motor, 462 kg.[3] The Star 27 helped it get to a higher orbit, beyond Earth's magnetosphere.[3]

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