Outgassing asymmetry of periodic comet Encke. I - Apparitions 1924-1984

Details Outgassing asymmetry of periodic comet Encke. I - Apparitions 1924-1984 Outgassing asymmetry of periodic comet Encke. I - Apparitions 1924-1984

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95..911s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 95, March 1988, p. 911-924, 970, 971.

Astronomy and Astrophysics

Astronomy

41

Comet Nuclei, Comet Tails, Encke Comet, Outgassing, Monte Carlo Method, Northern Hemisphere, Solar Gravitation, Solar Radiation, Southern Hemisphere, Variable Stars, Comets, Encke, Outgassing, Symmetry, Comae, Comet Nuclei, Venting, Surface, Position (Location), Dust, Emissions, Earth-Based Observations, Source, Rotation, Diagrams, Water, Sublimation, Calculations, Astronomy, Brightness, Distance, Orbital Parameters

Scientific paper

A concept of a collimated flow of ejecta from a discrete source (vent) on the surface of a rotating cometary nucleus is applied to P/Encke, based on positional observations of its sunward fanlike coma at 13 apparitions between 1924 and 1984. The major results include a finding that the observations are consistent with an invariable position of the rotation pole during the 60 yr (yielding an obliquity of 70°), although this is not to be interpreted as an indication that the nucleus is not precessing. Two vents are identified on the nucleus surface: one on the northern hemisphere at a latitude of +55°, of an estimated sublimation area of 0.4 km2, which is active along the inbound leg of the comet's orbit until a few days preperihelion and again beginning several weeks postperihelion; the other on the southern hemisphere at -75°, of an estimated area of 0.6 km2, whose activity prevails in the intervening time. There appears to be a significant difference between the two regions in terms of dust content in their emissions.

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