Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.326..573s&link_type=abstract
Nature (ISSN 0028-0836), vol. 326, April 9, 1987, p. 573, 574.
Astronomy and Astrophysics
Astronomy
24
Angular Velocity, Comet Nuclei, Ground Truth, Halley'S Comet, Spaceborne Astronomy, Image Analysis, Vega Project, Comets, Halley, Rotation, Period, Comet Nuclei, Vega Missions, Analysis, Spacecraft Observations, Giotto Mission, Periodicity, Motion, Diagrams, Shape, Gases, Dust, Production Rates, Hypotheses
Scientific paper
Vega 1, Vega 2, and Giotto images of comet Halley are reexamined, and it is concluded that the images refute the 7.4 day rotation period proposed for Halley by Millis and Schleicher (1986) based on photometric observations. The main support for this conclusion are the nonsymmetrical shape of the Halley nucleus and the independent observations of this irregular body by the three spacecraft over an interval of 7.7 days. A rotation period of 53.5 hours and a longer period of torque-free precession with the angular momentum vector inclined somewhat to the spin axis might be consistent with both the spacecraft and ground-based observations.
Larson Stefan M.
Sagdeev Roal'd. Z.
Smith Benjamin A.
Szegö Karoly
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