An asymmetric outgassing model for cometary nongravitational accelerations

Details An asymmetric outgassing model for cometary nongravitational accelerations An asymmetric outgassing model for cometary nongravitational accelerations

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98.1083y&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, Sept. 1989, p. 1083-1093.

Physics

49

Acceleration (Physics), Astronomical Models, Comets, Outgassing, Asymmetry, Halley'S Comet, Light Curve, Orbital Elements, Tempel 2 Comet, Comets, Outgassing, Models, Acceleration, Symmetry, Calculations, Data, Catalog, D'Arrest, Giacobini-Zinner, Kopff, Periodic Comets, Comparisons, Halley, Tempel 2, Brooks 2, Churyumov-Gerasimenko, Grigg-Skjellerup, Parameters, Perihelion, Orbital Elements, Theoretical Studies, Water, Acceleration

Scientific paper

The standard nongravitation force model has been modified by allowing the water-vaproization curve to peak a certain number of days (DT) either before or after perihelion, and the modification is shown to often improve the data fit. The best fit to the astrometric data is generally achieved for a value of DT corresponding to the offset in the comet's visual light curve. The asymmetric model, which more accurately mimics the comet's outgassing history, suggests only weakly that the rotation direction of Comet Halley is direct, and it does not provide evidence that the rotation axis of Comet Kopff passed through its orbit plane in the early twentieth century. Approximate lag angles of 4 deg for Comet Halley and 10 deg for Comet d'Arrest are found using the asymmetric model, and it is noted that these values are lower than those obtained with the standard model.

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