Effects of discrete-source outgassing on motions of periodic comets and discontinuous orbital anomalies

Details Effects of discrete-source outgassing on motions of periodic comets and discontinuous orbital anomalies Effects of discrete-source outgassing on motions of periodic comets and discontinuous orbital anomalies

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105..702s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 105, no. 2, p. 702-735.

Astronomy and Astrophysics

Astronomy

22

Comet Nuclei, Halley'S Comet, Orbit Perturbation, Orbital Elements, Outgassing, Interplanetary Dust, Momentum Transfer, Morphology, Comets, Models, Comet Nuclei, Encke, Periodic Comets, Outgassing, Spin, Orbital Elements, Anomalies, Period, Motion, Longitude, Perihelion, Perturbations, Sublimation, Acceleration, Momentum, Short-Period Comets, Water, Production Rate, Statistical Analysis, Giacobini-Zinner, Tempel 2

Scientific paper

Isoline maps of the Style II nongravitational parameters A1 and A2 of periodic comets are presented for a baseline model as functions of the parameters of the inertially fixed spin vector and the source's location-dependent thrust angle. The parameters A1 and A2 for a collection of sources are equal to the sum of their values for the individual contributors, thus depending on the source distribution. The model is consistent with even the most extreme among detected perturbations, including instances of rapid temporal changes in A2 and the discontinuous orbital anomalies, which are interpreted as products of a sudden redistribution of the transferred momentum due to episodic activation of short-lived sources. It is argued that the lifetimes of active regions vary considerably from case to case, and forced precession of the nucleus strongly influences the comet's activity pattern.

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