Abundances in Comet 19P/Borrelly at the Time of the Spacecraft Encounters

Details Abundances in Comet 19P/Borrelly at the Time of the Spacecraft Encounters Abundances in Comet 19P/Borrelly at the Time of the Spacecraft Encounters

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pasj...54l..35h&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.54, No.3, pp.L35-L37

Astronomy and Astrophysics

Astronomy

2

Comets: General, Comets: Individual (19P/Borrelly), Solar System: General, Spectroscopy

Scientific paper

A spectroscopic observation of comet 19P/Borrelly was carried out on 2001 September 23, using a low-dispersion spectrograph in the wavelength range 3800-7600Å. It was performed about 20hours after an encounter of the spacecraft Deep Space 1 (DS1) with the comet. We detected species such as CN, C2, [OI], and NH2, and estimated the gas-production rates of CN, C2, and NH2 relative to that of H2O based on a Haser model. The production-rate ratios and the gas-to-dust ratio were: Q(CN)/Q(H2O) = 0.094%, Q(C2)/Q(H2O) = 0.096%, Q(NH2)/Q(H2O) = 0.13%, and log[Q(H2O)/Afρ] = 26.0. Our calculated relative production rates of C2 and NH2 to CN were similar to to CN were similar to those of previous apparitions. Therefore, the circumstances of the comet when DS1 encountered may be the same as those during the last several apparitions, and many ground-based observations performed during previous apparitions will be useful to reveal the nature of the comet during the in situ observations by DS1.

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