Comet 10P/Tempel 2 Outgassing and Composition from Herschel and Ground-based Sub-millimeter Observations

Details Comet 10P/Tempel 2 Outgassing and Composition from Herschel and Ground-based Sub-millimeter Observations Comet 10P/Tempel 2 Outgassing and Composition from Herschel and Ground-based Sub-millimeter Observations

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.0305b&link_type=abstract

American Astronomical Society, DPS meeting #42, #3.05; Bulletin of the American Astronomical Society, Vol. 42, p.946

Astronomy and Astrophysics

Astronomy

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Scientific paper

Comet 10P/Tempel 2 was observed between 15 June and 29 July 2010 with the HIFI instrument of the Herschel Space Observatory, as part of the guaranteed time key programme "Water and related chemistry in the Solar System" (KP-GT HssO). The observations with Herschel were carried around the last perihelion passage of the comet (4.9 July 2010) at 1.42 AU from the Sun, at the maximum of its activity.
Several water lines were observed to map and monitor the mid and short-term activity of the comet. Complementary observations were obtained from the IRAM 30m radiotelescope on 7-11 July 2010. Both HERSCHEL and IRAM observations suggest that the outgassing is mostly dominated by a strong jet (at 0.9km/s), directed towards the observer and the north.
The gas temperature is estimated to 30K from the observation of methanol lines. The water outgassing peaked around 2.5E28 molec./s. Abundances of HCN, CH3OH, CS, H2S and NH3 will be presentded.
HCN and CH3OH were also detected two perihelions ago at CSO and JCMT and displayed similar strongly blueshifted lines illustrating the recurrent apparition of this strong jet.

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