A volatility index for comets

Details A volatility index for comets A volatility index for comets

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992icar...98..108w&link_type=abstract

Icarus (ISSN 0019-1035), vol. 98, no. 1, July 1992, p. 108-114.

Physics

4

Comets, Volatility, Brightness, Coma, Magnitude, Perihelions

Scientific paper

The variations in total brightness of a comet when it is most active, near perihelion, are presently used as the bases of a volatility index (VI) for short-period (SP) and long-period (LP) comets. Volatility does not correlate with period among the LP comets, and thereby shows no 'aging' effect; similarly, the VI measurements are the same for SP and for LP comets and exhibit no correlation with (1) absolute magnitude near perihelion, (2) orbital inclination, or (3) activity index measuring the intrinsic brightness change from great solar distances to the maximum near perihelion. Active comets are shown to be basically alike irrespective of their orbits or 'ages'.

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