Computer Science
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.333..146k&link_type=abstract
Nature (ISSN 0028-0836), vol. 333, May 12, 1988, p. 146-148.
Computer Science
14
Axes Of Rotation, Comet Nuclei, Halley'S Comet, Color Photography, European Space Agency, Giotto Mission, Comets, Halley, Rotation, Axis, Spacecraft Observations, Giotto Mission, Hmc Instrument, Earth-Based Observations, Comparisons, Comet Nuclei, Models, Jets, Period, Imagery, Diagrams, Emissions, Evolution
Scientific paper
The observations of comet Halley by the Halley Multicolour Camera (HMC) on board Giotto were supported by an extensive ground-based observational programme using the same filter set. The authors model dust jets visible on the ground-based images, assuming active sources on the rotating nucleus. They found no fit using the rotation axes so far derived from nucleus observations. A mean instantaneous spin axis, at the time of the Giotto encounter, pointing towards α = 328°, δ = -63° is consistent with both ground-based and HMC observations of the dust. A rotation period of about two days is confirmed.
Thomas Nicholas
Uwe Keller Horst
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