Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..369s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 187, no. 1-2, Nov. 1987, p. 369-374.
Astronomy and Astrophysics
Astronomy
46
Astronomical Spectroscopy, Halley'S Comet, Hydrogen Atoms, Reaction Kinetics, Solar Orbits, Ultraviolet Spectra, Carbon, Oxygen, Pioneer Venus Spacecraft, Spaceborne Astronomy, Water Vapor
Scientific paper
The Pioneer Venus Orbiter Ultraviolet Spectrometer measured the production of H, C, and O in comet Halley from late December 1985 to early March 1986. Water production rates obtained from the H data rose from 3.3×1029s-1 at 1 AU inbound to 1.2×1030s-1 at perihelion; there was a further increase to 1.6×1030s-1 followed by a slow decline to 1.4×1030s-1 at the time of the Vega-1 encounter. The H measurements show a periodic behavior that imply variations in the water production rate having structure within a 7.4-day sidereal period, in phase with similar variations seen in radical and dust production in March and April. Average H:O:C ratios of 1.0:0.7:0.07 were measured from 10 to 26 days after perihelion.
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