Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...539l.151n&link_type=abstract
The Astrophysical Journal, Volume 539, Issue 2, pp. L151-L154.
Astronomy and Astrophysics
Astronomy
25
Comets: General, Comets: Individual: Name: Lee (C/ 1999 H1)
Scientific paper
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.
Ashby Matthew L. N.
Bergin Edwin A.
Chin Gordon
Erickson Neal R.
Goldsmith Paul F.
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