Abstract
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 language | English (US) |
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Pages (from-to) | 549-552 |
Number of pages | 4 |
Journal | European Space Agency, (Special Publication) ESA SP |
Issue number | 500 |
State | Published - Jul 2002 |
All Science Journal Classification (ASJC) codes
- Aerospace Engineering
- Space and Planetary Science