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NAM2012 - All Presentation Details

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Long Term Evolution of Comet Halley & the Orionid stream

Author: Aswin Sekhar

ARMAGH OBSERVATORY UK

Co-Authors: D. J. ASHER (ARMAGH OBSERVATORY, UK)

Session: PL1: Small bodies in Our Solar System

Presentation type: Talk      17:46  Tuesday 27th 17:00-18:15 

Summary:

It is well known that comet 1P/Halley has the unique distinction of having an accurate observational record (which helps in constraining the theoretical models) for a long continuous set of perihelion passages which dates back to 240 B.C. (Yeomans & Kiang 1981). In this talk, we present some interesting results about the significance of the 1:6 & 2:13 mean motion resonances of the comet & the Orionid stream with Jupiter. Earlier works (Rendtel 2007, Sato & Watanabe 2007) on 1:6 resonant Orionids showed that such dust trails could cause meteor outbursts for many years like in the case of considerably enhanced zenithal hourly rates seen during 2006-2010 & the indication of a similar activity profile between 1933-1938 from the historical records (Lovell 1954) of past observations. Our present work quantifies the timescales over which stream particles, and 1P/Halley itself, can survive in these resonances. This determines the long term dynamical evolution and stream structure. Further numerical integrations reveal analogous resonant behaviour of other solar system bodies, so that there is a lot more to be understood about this fascinating phenomenon.

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