Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992icar..100..162g&link_type=abstract
Icarus (ISSN 0019-1035), vol. 100, no. 1, p. 162-186.
Astronomy and Astrophysics
Astronomy
83
Comets, Halley'S Comet, Infrared Astronomy, Infrared Photometry, Ablation, Emission Spectra, Grain Size, Interplanetary Dust, Orbital Elements, Silicates, Spectral Energy Distribution, Tables (Data)
Scientific paper
Infrared photometry over 0.7-23 micron range is presented for P/Halley 1986 III and six other recent bright comets. It is concluded that comets can be classified by their thermal infrared energy distributions. IR Type I comets have low continuum superheat and the 10-micron silicate emission is muted or absent. IR Type II comets have large continuum superheat and strong silicate emission features. Simultaneous measurements of P/Halley and Bradfield 1980 XV are generally consistent with the steady-state model for nuclear ablation. P/Halley's dust coma had an average albedo of 0.20 at a scattering angle of 130 deg. The correlation between superheat and 20-micron silicate excess, the flattened forward-scattering peak of the albedo curve, and the relatively low backscattering albedo are all consistent with laboratory and theoretical results for nonspherical and fluffy grains. The results appear to be especially consistent with core-mantle grain models such as those proposed by Greenberg and Hage (1989).
Gehrz Robert D.
Ney Peter E.
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