Inner coma imaging of Comet Levy (1990c) with the Hubble Space Telescope

Details Inner coma imaging of Comet Levy (1990c) with the Hubble Space Telescope Inner coma imaging of Comet Levy (1990c) with the Hubble Space Telescope

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992icar...97...85w&link_type=abstract

Icarus (ISSN 0019-1035), vol. 97, no. 1, May 1992, p. 85-98.

Physics

11

Brightness Distribution, Comet Heads, Hubble Space Telescope, Iue, Light Curve, Comet Nuclei, Cosmic Dust, Solar System

Scientific paper

HST observations of Comet Levy at geocentric and heliocentric distances of about 1 AU show a highly asymmetrical coma in which the sunward-facing hemisphere is brighter than the tailward one by a factor of 2; this is in keeping with dayside volatile sublimation. Radial brightness profiles perpendicular to the sun-comet line are found to be highly symmetric about the nucleus. Detailed image analysis reveals indications of a hemispherical dust arc which propagates through the coma at an average projected velocity of about 0.16 km/sec. It is suggested that periodic occurrences of such dust arcs could account for the temporal variability in IUE continuum photometry.

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