Observations of Water in Comet 81P/Wild 2 by Subaru Telescope / IRCS

Details Observations of Water in Comet 81P/Wild 2 by Subaru Telescope / IRCS Observations of Water in Comet 81P/Wild 2 by Subaru Telescope / IRCS

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.2812h&link_type=abstract

American Astronomical Society, DPS meeting #42, #28.12; Bulletin of the American Astronomical Society, Vol. 42, p.962

Astronomy and Astrophysics

Astronomy

Scientific paper

Comet 81P/Wild 2 was the target of the STARDUST sample return mission by NASA, and the results of ground-based analysis of sampled dust grains provided us the details of cometary dusts. However, it is little known about gaseous species in the comet 81P/Wild 2. The most abundant gaseous species in the coma is H2O that controls physical processes in the coma. Water production rate is one of important parameter to evaluate the activity of the comet. To determine the water production rate of comet 81P/Wild 2, we performed near-infrared high-dispersion spectroscopic observations by Subaru telescope/IRCS. Our observations were carried out on both January 31 and February 1, 2010. We concentrate on the data taken on February 1 because S/N ratio of spectra taken on January 31 was not so good. The brightness of the comet was about 10th magnitude at our observations. We could detect the strong water emission lines; X (1,0,1) 202 --- X (1,0,0) 303 at 3526.5 cm-1 and X (1,0,1) 211 --- X (1,0,0) 312 at 3514.4 cm-1. We will present the water production rate of comet 81P/Wild 2 determined from those emission lines.

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