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During March-April 2002, while between the orbits of Jupiter and Saturn, theCassini spacecraft detected a significant enhancement in pickup proton flux.The most likely explanation for this enhancement was the addition of protons tothe solar wind by the ionization of neutral hydrogen in the corona of comet153P/Ikeya-Zhang. This comet passed relatively close to the Sun-Cassini lineduring that period, allowing pickup ions to be carried to Cassini by the solarwind. This pickup proton flux could have been further modulated by the passageof the interplanetary counterparts of coronal mass ejections past the comet andspacecraft. The radial distance of 6.5 Astronomical Units (au) traveled by thepickup protons, and the implied total tail length of >7.5 au make this cometaryion tail the longest yet measured.

Cometary ions detected by the Cassini spacecraft 6.5 au downstream of Comet 153P/Ikeya-Zhang