[SunkenCiv]

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Merely of possible interest; also, comets focussing due to an undiscovered large body is one of the planet X models.

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[SunkenCiv]

C/2006 M4 (SWAN)
JPL Small-Body Database Browser
http://ssd.jpl.nasa.gov/sbdb.cgi?ID=dK06M040;orb=1;cov=0

Classification: Hyperbolic Comet
SPK-ID: 1002407

(hyperbolic orbits I think are diagnostic of comets which are just passing through, iow, not originating in the Solar System)