Ice-skater model for the nucleus of Comet Levy 1990c - Spin-up by a shrinking nucleus

Details Ice-skater model for the nucleus of Comet Levy 1990c - Spin-up by a shrinking nucleus Ice-skater model for the nucleus of Comet Levy 1990c - Spin-up by a shrinking nucleus

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44..163w&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 44, no. 2, 1992, p. 163-166.

Astronomy and Astrophysics

Astronomy

3

Angular Velocity, Astronomical Models, Comet Nuclei, Angular Momentum, Ice, Moments Of Inertia

Scientific paper

The activity period of Comet Levy 1990c diminished by about 10 percent during a period of about one half month. This suggests a gradual increase in the angular velocity of the rotating nucleus. The ice-skater model is proposed for this spin-up phenomenon as a result of a shrinking of the nucleus. Nucleus shrinking along with the formation of a dense mantle changes the moments of inertia of the nucleus, and produces a spin-up of the rotation. The observed mass-loss rate indicates an extremely low density (not greter than 0.14 g/cu cm), which suggests that primitive comets have a porous amorphous ice surface.

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