Nucleus of comet Halley as a torque-free rigid rotator

Details Nucleus of comet Halley as a torque-free rigid rotator Nucleus of comet Halley as a torque-free rigid rotator

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.325..326s&link_type=abstract

Nature (ISSN 0028-0836), vol. 325, Jan. 22, 1987, p. 326-328.

Physics

48

Comet Nuclei, Halley'S Comet, Periodic Variations, Cometary Atmospheres, Moments Of Inertia, Comets, Halley, Comet Nuclei, Rotation, Period, Models, Spin, Shape, Axes, Moment Of Inertia, Periodicity, Diagrams, Calculations, Dynamics

Scientific paper

Recent observations provide evidence for approximately 2.2 day and 7.4 day periods in phenomena associated with the nucleus of comet Halley. The author proposes a model for the rotation of the nucleus on the assumption that it is homogeneous and a torque-free rigid rotator. It spins about its long axis with a period of 7.4 days, while this axis precesses about a fixed direction with a period of 2.2 days. To satisfy the moments of inertia, the precession angle is to be 77°. This model settles the major problems associated with the recent controversy of two rotation periods.

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