Abstract
Halley's comet has been tracked for observing at the Instituto Argentino de Radioastronomia (IAR) in the 1667 MHz line of OH, 4 hr a day, from February 6 to May 1, 1986. It has been detected in absorption from March 24 to April 23. A detail of the observations and of the results is given here. The mean velocities show that there have not been any significant asymmetries in the profile shapes. The total number of OH molecules has been estimated for each day from the observed profiles and compared with the values predicted by Schloerb and Gerard (1985) using the same model. The observational results for this number, for the period March 23 to April 12, are, on average, 2.4 times larger than the predicted values, but it shows rapid variations with maximum-to-minimum ratios of the order of 1.7. The average of the OH production rate derived from these observations is (4.6 + or - 0.2) x 10 to the 29th molecules/s.
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