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Comet C/2006 W3 (Christensen) was observed in November 2009 at 3.3 AU fromthe Sun with Herschel. The PACS instrument acquired images of the dust coma in70- and 160-micrometers filters, and spectra covering several H2O rotationallines. Spectra in the range 450-1550 GHz were acquired with SPIRE. The cometemission continuum from 70 to 672 micrometers was measured, but no lines weredetected. The spectral energy distribution indicates thermal emission fromlarge particles and provides a measure of the size distribution index and dustproduction rate. The upper limit to the water production rate is compared tothe production rates of other species (CO, CH3OH, HCN, H2S, OH) measured withthe IRAM 30-m and Nancay telescopes. The coma is found to be strongly enrichedin species more volatile than water, in comparison to comets observed closer tothe Sun. The CO to H2O production rate ratio exceeds 220%. The dust to gasproduction rate ratio is on the order of 1.

A study of the distant activity of comet C/2006 W3 (Christensen) using Herschel and ground-based radio telescopes