Physics
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002em%26p...90..119s&link_type=abstract
Earth, Moon, and Planets, v. 90, Issue 1, p. 119-130 (2002).
Physics
4
Comet Hale-Bopp, Long-Period Comet, Non-Gravitational Effects, Comet Hale–Bopp
Scientific paper
The role of non-gravitational forces in the evolution of orbitalmotion of C/1995 O1 (Hale-Bopp) has been investigated. Inorbital calculations the observational material covering theperiod from April 1993 up to August 2001 was used. To model thenon-gravitational acceleration, observed and theoretical profilesof the H2O production rates were employed. A set of forcedprecession models of a rotating cometary nucleus consistent withthe observed spin axis orientation was fitted to positionalobservations. The non-gravitational models allowed us to constrainthe mass and radius of the comet. The orbitalevolution of Comet Hale-Bopp was investigated over ±400 k yusing two sets of randomly varied orbital elements wellrepresenting all positional observations in the pure gravitationalcase, as well as in the non-gravitational case. The calculationsshowed that the comet's motion is predictable only over an interval ofa few orbital periods. The statistical conclusions changesignificantly when non-gravitational effects are included in the analysis.
Królikowska Małgorzata
Sitarski Grzegorz
Szutowicz Sławomira
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