Thermal infrared imaging of Comet Halley

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cosmic Dust, Halley'S Comet, Infrared Astronomy, Particle Size Distribution, Spatial Distribution, Color, Light Curve, Silicates, Temporal Distribution

Scientific paper

Thermal infrared images (10.8, 12.8, and 19.2 microns) of comet Halley were obtained on 1986 Mar. 28.7, 29.7 and 30.7 UT using the NASA-MSFC 20-pixel bolometer array at the NASA Infrared Telescope Facility. Analysis of the observations shows: the presence of spatial structure indicative of dust ejection occurring mainly on the sunward side of the nucleus; a dust coma deficient in large particles (radius greater than 100 microns) compared with that of Comet P/Giacobini-Zinner, temporal variability consistent with an extrapolation of a quasi-sinusoidal light curve observed by IUE on 1986 March 23, 24, and 25; and a maximum at the nuclear condensation of the color temperature and the strength of the silicate emission feature.

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