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176P/LINEAR is a member of the new cometary class known as main-belt comets(MBCs). It displayed cometary activity shortly during its 2005 perihelionpassage that may be driven by the sublimation of sub-surface ices. We havetherefore searched for emission of the H2O 110-101 ground state rotational lineat 557 GHz toward 176P/LINEAR with the Heterodyne Instrument for the FarInfrared (HIFI) on board the Herschel Space Observatory on UT 8.78 August 2011,about 40 days after its most recent perihelion passage, when the object was ata heliocentric distance of 2.58 AU. No H2O line emission was detected in ourobservations, from which we derive sensitive 3-sigma upper limits for the waterproduction rate and column density of < 4e25 molec/s and of < 3e10 cm^{-2},respectively. From the peak brightness measured during the object's activeperiod in 2005, this upper limit is lower than predicted by the relationbetween production rates and visual magnitudes observed for a sample of cometsby Jorda et al. (2008) at this heliocentric distance. Thus, 176P/LINEAR waslikely less active at the time of our observation than during its previousperihelion passage. The retrieved upper limit is lower than most values derivedfor the H2O production rate from the spectroscopic search for CN emission inMBCs.

An upper limit for the water outgassing rate of the main-belt comet 176P/LINEAR observed with Herschel/HIFI