Organic Depletion and Low Rotational Temperatures in Comet 2P/Encke, Revealed Through Infrared Spectroscopy

Details Organic Depletion and Low Rotational Temperatures in Comet 2P/Encke, Revealed Through Infrared Spectroscopy Organic Depletion and Low Rotational Temperatures in Comet 2P/Encke, Revealed Through Infrared Spectroscopy

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.0303r&link_type=abstract

American Astronomical Society, DPS meeting #42, #3.03; Bulletin of the American Astronomical Society, Vol. 42, p.946

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Scientific paper

We present high-resolution infrared spectra of the ecliptic comet 2P/Encke, acquired on 4-6 Nov. 2003 with the Near Infrared Echelle Spectrograph on the Keck II telescope. Comet 2P/Encke has the shortest period (3.3 years), among comets studied through infrared spectroscopy, and is a valuable addition to our sample. We extracted rotational temperatures and production rates for the following parent volatiles: H2O, HCN, CH4, C2H2, C2H6, H2CO, CH3OH and CO. 2P/Encke is depleted in C2H6, C2H2, HCN, CH4 and CO, and is normal in H2CO and CH3OH. Rotational temperatures extracted for H2O and HCN are very low (20 - 30 K), compared to other comets. We report rotational temperatures, water production rates, and mixing ratios of organic volatiles, and present the overall composition of comet 2P/Encke in perspective (compared to organics-enriched, organics-normal, and organics-depleted comets). This contributes to the study of compositional diversity of cometary nuclei, which hold important clues to the origin and evolution of our Solar System.

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