Comet P/Halley at a heliocentric preperihelion distance of 2.6 AU - Jet activity and properties of the dust coma

Details Comet P/Halley at a heliocentric preperihelion distance of 2.6 AU - Jet activity and properties of the dust coma Comet P/Halley at a heliocentric preperihelion distance of 2.6 AU - Jet activity and properties of the dust coma

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...222..316l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 222, no. 1-2, Sept. 1989, p. 316-322.

Astronomy and Astrophysics

Astronomy

5

Astronomical Photography, Astronomical Photometry, Comet Tails, Cosmic Dust, Halley'S Comet, High Resolution, Infrared Astronomy, Interstellar Extinction, Perihelions, Steady State, Ultraviolet Astronomy, Comets, Halley, Jetting, Dust, Comae, Astronomy, Photometry, Infrared, Earth-Based Observations, Jets, Wavelengths, Albedo, Production Rate, Morphology, Imagery, Magnitude, Brightness, Color, Reflectivity, Comet Nuclei

Scientific paper

This paper presents an in-depth analysis of a high-resolution photograph of comet P/Halley obtained on September 12, 1985 when it was a heliocentric distance of 2.6 AU preperihelion. The coma has a diameter of 138,000 km and exhibits structures which are interpreted as three jets, one best seen in the outer part of the coma extending to 29000 km and the two others, in the inner part extending to about 7000 km. The integrated magnitude and radial profiles of the coma are given showing that the comet does not follow the simple steady-state, radial outflow model. By combining the photometric result with nearly simultaneous ultraviolet and infrared observations, it is found that the strong reddening in the ultraviolet gradually levels off in the visible as the color becomes neutral at 2 microns and blue beyond 3 microns. A geometric albedo at zero phase angle of 0.04 is obtained, as well as a dust production rate of 30 to 120 kgs.

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