Modelling the activity of 2060 Chiron

Details Modelling the activity of 2060 Chiron Modelling the activity of 2060 Chiron

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.276.1148p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 276, Issue 4, pp. 1148-1154.

Astronomy and Astrophysics

Astronomy

25

Comets: General, Comets: Individual: 2060 Chiron, Minor Planets, Asteroids

Scientific paper

Model calculations of the evolution of 2060 Chiron explain the observed activity pattern as being the result of a delayed thermal pulse in a porous matrix composed of dust and of amorphous water ice, which contains a small amount of trapped CO. Crystallization of the amorphous ice, accompanied by the release of the occluded gas, constitutes the source of activity. Many different combinations of parameters are tested. A composition dominated by crystalline water ice or ices of CO or CO_2 is ruled out. The model that best reproduces the temperatures inferred from IR observations at several heliocentric distances, as well as the rates of mass ejection, is obtained by assuming a relatively low effective surface emissivity.

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