Model Calculations of Nongravitational Forces on Shortperiod Comets - Part Two - High Obliquity Case

Details Model Calculations of Nongravitational Forces on Shortperiod Comets - Part Two - High Obliquity Case Model Calculations of Nongravitational Forces on Shortperiod Comets - Part Two - High Obliquity Case

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...170..161r&link_type=abstract

Astronomy and Astrophysics, Vol. 170, NO. DEC, P. 161, 1986

Astronomy and Astrophysics

Astrophysics

9

Scientific paper

We have recently computed an extensive set of thermal models for short-period comet nuclei assuming sublimation of H2O ice from the surface and including heat conduction on the rotational and orbital time scales. Emphasis was placed on investigating the variations of the nongravitational parameters A1, A2 and A3 with distance from the Sun. Models of low equatorial obliquity were presented separately (Froeschl6 and Rickman, 1986). Here we concentrate on high obliquities finding some first indications about the behaviour of the A1, A2 and A3 parameters under such circumstances and influenced by heat conduction effects. We study two special cases: comets P/Encke and P/Schwassmann-Wachmann 1. In general we find two passages of zero per orbital revolution by A3 and four by A2. Comparing with the simplified picture hitherto used in precession modelling (e.g. Sekanina, 1984), we find drastically different results in particular for the case of P/Schwassmann-Wachmann 1. This indicates that, with the possible exception of very small perihelion distances, interpretations of secular evolutions of A2 in terms of spin axis orientations and precessions should take orbital and seasonal heat flow effects into account in order to provide reliable, detailed information.

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