Neufeld, DAStauffer, JRBergin, EAKleiner, SCPatten, BMWang, ZAshby, MLNChin, GErickson, NRGoldsmith, PFHarwit, MHowe, JEKoch, DGPlume, RSchieder, RSnell, RLTolls, VWinnewisser, GZhang, YFMelnick, GJ2024-04-262024-04-262000-0110.1086/312851https://hdl.handle.net/20.500.14394/3307<p>The published version is located at <a href="http://iopscience.iop.org/1538-4357/539/2/L151">http://iopscience.iop.org/1538-4357/539/2/L151</a></p>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 33 × 45 (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.comets : generalcomets : individual (Lee (C/1999 HI))Astrophysics and Astronomyarticle