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Ammonium hydrosulphide has long since been postulated to exist at least incertain layers of the giant planets. Its radiation products may be the reasonfor the red colour seen on Jupiter. Several ammonium salts, the products of NH3and an acid, have previously been detected at comet 67P/Churyumov-Gerasimenko.The acid H2S is the fifth most abundant molecule in the coma of 67P followed byNH3. In order to look for the salt NH4+SH-, we analysed in situ measurementsfrom the Rosetta/ROSINA Double Focusing Mass Spectrometer during the Rosettamission. NH3 and H2S appear to be independent of each other when sublimatingdirectly from the nucleus. However, we observe a strong correlation between thetwo species during dust impacts, clearly pointing to the salt. We find thatNH4+SH- is by far the most abundant salt, more abundant in the dust impactsthan even water. We also find all previously detected ammonium salts and forthe first time ammonium fluoride. The amount of ammonia and acids balance eachother, confirming that ammonia is mostly in the form of salt embedded into dustgrains. Allotropes S2 and S3 are strongly enhanced in the impacts, while H2S2and its fragment HS2 are not detected, which is most probably the result ofradiolysis of NH4+SH-. This makes a prestellar origin of the salt likely. Ourfindings may explain the apparent depletion of nitrogen in comets and maybehelp to solve the riddle of the missing sulphur in star forming regions.

Abundant ammonium hydrosulphide embedded in cometary dust grains