On the rotating nucleus of Comet P/Grigg-Skjellerup

Details On the rotating nucleus of Comet P/Grigg-Skjellerup On the rotating nucleus of Comet P/Grigg-Skjellerup

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aca....42...59s&link_type=abstract

Acta Astronomica (ISSN 0001-5237), vol. 42, no. 1, 1992, p. 59-65.

Statistics

Computation

9

Comet Nuclei, Grigg-Skjellerup Comet, Orbit Calculation, Astronomical Models, Orbital Elements, Rotating Matter

Scientific paper

Sekanina's model for the forced precession of the spin-axis of a rotating cometary nucleus is employed to investigate the nongravitational motion of Comet P/Grigg-Skjellerup during 1922-1991. Formulas for the forced precession were adapted to use them in orbital computations. Astrometric observations of the comet are used to correct the orbit and determine six parameters connected with a nongravitational force and with the rotating and precessing nucleus of the comet. The nucleus of Comet P/Grigg-Skjellerup should be a prolate spheroid rotating around its longer axis, and Ra:Rb is about equal to 10:14 where Ra and Rb are the equatorial and polar radii of the nucleus.

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