Ethane (C2H6) and water (H2O) were detected in comet 2002 C1 Ikeya-Zhang on seven dates post-perihelion between UT 2002 March 21.9 (Rh = 0.51 AU) and April 13.9 (Rh = 0.78 AU), using the Cryogenic Echelle Spectrometer (CSHELL) at the NASA Infrared Telescope Facility. Our long-slit spectra featured both high spectral dispersion and high spatial resolution about the nucleus, permitting the extraction of rotational temperatures (for H2O), production rates, and spatial information along the slit. Here we present results for H2O and C2H6 on one date (April 13.7-13.9). Average production rates on this date are Q(H2O) = (2.1 ± 0.3) × 1029 molecules s-1, and Q(C2H6) = (1.3 ± 0.2) × 1027 molecules s-1, giving a mixing ratio of C2H6 / H2O = (6.2 ± 1.3) × 10-3.
|Original language||English (US)|
|Number of pages||4|
|Journal||European Space Agency, (Special Publication) ESA SP|
|State||Published - Jul 1 2002|
All Science Journal Classification (ASJC) codes
- Aerospace Engineering
- Space and Planetary Science