Rationalization of Comet Halley's periods

Details Rationalization of Comet Halley's periods Rationalization of Comet Halley's periods

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990icar...86...30b&link_type=abstract

Icarus (ISSN 0019-1035), vol. 86, July 1990, p. 30-51.

Computer Science

28

Comet Nuclei, Giotto Mission, Halley'S Comet, Vega Project, Angular Momentum, Orientation, Oscillations, Periodic Variations, Comets, Halley, Period, Comet Nuclei, Periodicity, Brightness, Halos, Spacecraft Observations, Vega Missions, Rotation, Precession, Models, Oscillations, Motion, Earth-Based Observations, Photometry, Jetting, Comet Tails, Parameters, Comparisons, Spin, Analysis

Scientific paper

The sense of long axis orientation of Comet Halley during the Vega 1 encounter must be reversed from that deduced by Sagdeev et al. (1986) in order to harmonize the comet nucleus' Vega/Giotto-observed orientations with periodicities extracted from time-series brightness data. It is also demonstrated that Vega/Giotto observations can be satisfied by either a 2.2- or 3.7-day long-axis free precession period. A novel Fourier algorithm is used to reanalyze five independent data sets; strong evidence is adduced for periods harmonically related to a 7.4-day period. The preferred candidate models for Halley's nuclear rotation are characterized by a long-axis precession period of 3.7 days.

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