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Title:
Submillimeter Wave Astronomy Satellite Observations of Water Vapor toward Comet C/1999 H1 (Lee)
Authors:
Neufeld, D. A.; Stauffer, J. R.; Bergin, E. A.; Kleiner, S. C.; Patten, B. M.; Wang, Z.; Ashby, M. L. N.; Chin, G.; Erickson, N. R.; Goldsmith, P. F.; Harwit, M.; Howe, J. E.; Koch, D. G.; Plume, R.; Schieder, R.; Snell, R. L.; Tolls, V.; Winnewisser, G.; Zhang, Y. F.; Melnick, G. J.
Affiliation:
AA(Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218), AB(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138), AC(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138), AD(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138), AE(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138), AF(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138), AG(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138), AH(NASA Goddard Space Flight Center, Greenbelt, MD 20771), AI(Department of Astronomy, University of Massachusetts, Amherst, MA 01003), AJ(National Astronomy and Ionosphere Center, Department of Astronomy, Cornell University, Space Sciences Building, Ithaca, NY 14853-6801), AK(511 H Street SW, Washington, DC 20024-2725 also Cornell University), AL(Department of Astronomy, University of Massachusetts, Amherst, MA 01003), AM(NASA Ames Research Center, Moffett Field, CA 94035), AN(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138), AO(I. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany), AP(Department of Astronomy, University of Massachusetts, Amherst, MA 01003), AQ(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138), AR(I. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany), AS(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138), AT(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138)
Publication:
The Astrophysical Journal, Volume 539, Issue 2, pp. L151-L154. (ApJL Homepage)
Publication Date:
08/2000
Origin:
UCP
ApJ Keywords:
Comets: General, Comets: Individual: Name: Lee (C/ 1999 H1)
DOI:
10.1086/312851
Bibliographic Code:
2000ApJ...539L.151N

Abstract

We have detected the 110-101 pure rotational transition of water vapor toward comet C/1999 H1 using the Submillimeter Wave Astronomy Satellite. Over the period 1999 May 19.01-23.69 UT, the average integrated antenna temperature was 1.79+/-0.03 K km s-1 within a 3.3′×4.5′ (FWHM) elliptical beam. For an assumed ortho-to-para ratio of 3, we estimate the total water production rate as 8×1028 s-1. This value lies approximately 50% above the value estimated by Biver et al. from contemporaneous radio observations of hydroxyl molecules. The observed line width of 1.8 km s-1 (FWHM) is broader than the instrumental profile and suggests an intrinsic line width of about 1.4 km s-1 (FWHM). The data, taken during a portion of every 97 minute spacecraft orbit over a 4.68 day period, provide no evidence for variability.
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