Other
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.1618k&link_type=abstract
American Astronomical Society, DPS meeting #40, #16.18; Bulletin of the American Astronomical Society, Vol. 40, p.415
Other
Scientific paper
We present high dispersion near-infrared spectra of comet C/2004 Q2 (Machholz) taken by using NIRSPEC spectrograph at the Keck-II telescope on Jan 30, 2005. Comet Machholz is an Oort cloud comet and its perihelion passage was in late Jan 2005. Thanks to the brightness of the comet, very high S/N ratio spectra were obtained in L-band.
Many emission lines from parent and daughter molecules were detected in our spectra: H2O, OH, HCN, NH2, C2H2, CH4, C2H6, H2CO, CH3OH. NH3 was probably detected but its emission lines were contaminated with NH2 lines.
Gas production rates and mixing ratios of the molecules were determined from the spectra. The mixing ratios in the comet are almost normal compared to other Oort cloud comets. Furthermore, constraints to nuclear spin temperatures of both H2O and CH4, and to the D/H ratio in methane were also obtained. Origin of icy materials in C/2004 Q2 (Machholz) will be discussed based on these results.
Kawakita Hideyo
Kobayashi Hirotada
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