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The Jupiter-family comet 10P/Tempel 2 was observed during its 2010 returnwith the Herschel Space Observatory. We present here the observation of the (J,K) = (1, 0)-(0, 0) transition of ammonia at 572 GHz in this comet with theHeterodyne Instrument for the Far Infrared (HIFI) of Herschel. We also reporton radio observations of other molecules (HCN, CH3OH, H2S and CS) obtainedduring the 1999 return of the comet with the CSO telescope and the JCMT, andduring its 2010 return with the IRAM 30-m telescope. Molecular abundancesrelative to water are 0.09%, 1.8%, 0.4%, and 0.08% for HCN, CH3OH, H2S, and CS,respectively. An abundance of 0.5% for NH3 is obtained, which is similar to thevalues measured in other comets. The hyperfine structure of the ammonia line isresolved for the first time in an astronomical source. Strong anisotropy in theoutgassing is present in all observations from 1999 to 2010 and is modelled toderive the production rates.

Ammonia and other parent molecules in comet 10P/Tempel 2 from Herschel/HIFI and ground-based radio observations