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We present Herschel observations of water isotopologues in the atmosphere ofthe Jupiter-family comet 45P/Honda-Mrkos-Pajdusakova. No HDO emission isdetected, with a 3 sigma upper limit of 2.0 10-4 for the D/H ratio. This valueis consistent with the earlier Herschel measurement in the Jupiter-family comet103P/Hartley 2. The canonical value of 3 10-4 measured pre-Herschel in a sampleof Oort-cloud comets can be excluded at a 4.5 sigma level. The observationspresented here further confirm that a diversity of D/H ratios exists in thecomet population and emphasize the need for additional measurements with futureground-based facilities, such as CCAT, in the post-Herschel era.

A Herschel Study of D/H in Water in the Jupiter-Family Comet 45P/Honda-Mrkos-Pajdusakova and Prospects for D/H Measurements with CCAT