The Chemical Composition of Comet C/2006 P1 McNaught After Perihelion Using High-Resolution Infrared Spectroscopy

Details The Chemical Composition of Comet C/2006 P1 McNaught After Perihelion Using High-Resolution Infrared Spectroscopy The Chemical Composition of Comet C/2006 P1 McNaught After Perihelion Using High-Resolution Infrared Spectroscopy

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.5311d&link_type=abstract

American Astronomical Society, DPS meeting #39, #53.11; Bulletin of the American Astronomical Society, Vol. 39, p.522

Astronomy and Astrophysics

Astronomy

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Scientific paper

C/2006 P1 McNaught was the brightest comet in over forty years making a spectacular appearance during the winter of 2006/2007. Dynamically new from the Oort cloud, this comet became unexpectedly bright and active on the incoming leg of its close perihelion passage (q = 0.17 AU). Although primarily visible from the southern hemisphere after perihelion, there was a brief observing window for the comet in Hawaii during the daytime in late January 2007, providing the opportunity to determine the chemistry of a dynamically new comet after its very close approach to the Sun. We present post-perihelion absolute and relative production rates for H2O, CO, CH4, C2H6, C2H2, H2CO, NH3 and HCN in the coma of C/2006 P1 McNaught on UT 2007 Jan. 27 using the CSHELL spectrometer (R 25,000) at the NASA/IRTF during a Target of Opportunity observation. The relative production rates (with respect to H2O) reveal a slightly depleted composition for CO and CH4, while C2H2 and NH3 are substantially enhanced in comparison to other comets. This work was supported by the NASA Planetary Astronomy and Planetary Atmospheres Programs.

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