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Title:
Water production and release in Comet 153P/Ikeya-Zhang (C/2002 C1): accurate rotational temperature retrievals from hot-band lines near 2.9-μm
Authors:
dello Russo, Neil; Disanti, Michael A.; Magee-Sauer, Karen; Gibb, Erika L.; Mumma, Michael J.; Barber, Robert J.; Tennyson, Jonathan
Affiliation:
AA(; ), AB(Laboratory for Extraterrestrial Physics, NASA Goddard Space Flight Center Code 693, Greenbelt, MD 20771, USA), AC(Department of Chemistry and Physics, Rowan University, Glassboro, NJ 08028, USA), AD(NAS-NRC, Laboratory for Extraterrestrial Physics, NASA Goddard Space Flight Center Code 690.2, Greenbelt, MD 20771, USA), AE(Laboratory for Extraterrestrial Physics, NASA Goddard Space Flight Center Code 690, Greenbelt, MD 20771, USA), AF(Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, UK), AG(Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, UK)
Publication:
Icarus, Volume 168, Issue 1, p. 186-200. (Icarus Homepage)
Publication Date:
03/2004
Origin:
ELSEVIER
Keywords:
Comets, Ikeya-Zhang, Infrared, Spectroscopy, Water
DOI:
10.1016/j.icarus.2003.11.004
Bibliographic Code:
2004Icar..168..186D

Abstract

Multiple non-resonance fluorescence lines of water (H2O) were detected in Comet 153/P Ikeya-Zhang (2002 C1) 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. Analysis of 2.9-μm water lines enabled accurate determination of rotational temperatures on three dates. The derived H2O rotational temperatures were 138+6-5, 141+10-9, and 94+/-3 K on UT 2002 March 22.0, March 23.0, and April 13.8, respectively. Water production rates were retrieved from spectral lines measured in nineteen separate grating settings over seven observing periods. The derived heliocentric dependence of the water production rate was Q=(9.2+/-1.1)×1028[Rh(-3.21+/-0.26)] moleculess-1. The spatial distribution of H2O in the coma was consistent with its release directly from the nucleus (as a native source) on all dates.
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