Production of HCN and C2H2 in comet C/2002 C1 Ikeya-Zhang on UT 2002 April 13.8

Karen Magee-Sauer, Neil Dello Russo, Michael A. DiSanti, Erika Gibb, Michael J. Mumma

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Hydrogen cyanide (HCN) and acetylene (C2H2) were detected in comet C/2002 C1 Ikeya-Zhang at infrared wavelengths near 3.0 μm using the Cryogenic Echelle Spectrometer (CSHELL) at the NASA Infrared Telescope Facility atop Mauna Kea, HI [1]. Our data set includes observations of the 3.0 μm region for 6 dates ranging from UT 2002 March 21.9 (Rh = 0.51 AU) to April 13.9 (Rh = 0.78 AU). In this paper we report results for one date (April 13.8) where the absolute production rates for HCN and C2H2 are (3.8 ± 0.5) × 1026 molecules s-1 and (3.7 ± 0.8) × 1026 molecules s-1, respectively. These measurements result in a relative abundance of HCN/H2O = (0.18 ± 0.04)% and C2H2/H2O = (0.18 ± 0.05)% (Q(H2O) = (2.1 ± 0.3) × 1029 [2]).

Original languageEnglish (US)
Pages (from-to)549-552
Number of pages4
JournalEuropean Space Agency, (Special Publication) ESA SP
Issue number500
StatePublished - Jul 2002

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Space and Planetary Science


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