Onset of sublimation in comet P/Halley (1982i)

Details Onset of sublimation in comet P/Halley (1982i) Onset of sublimation in comet P/Halley (1982i)

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.316..241w&link_type=abstract

Nature (ISSN 0028-0836), vol. 316, July 18, 1985, p. 241, 242.

Astronomy and Astrophysics

Astronomy

34

Comet Nuclei, Halley'S Comet, Sublimation, Albedo, Astronomical Photometry, Light Curve, Comets, Halley, Sublimation, Comet Nuclei, Emissions, Observations, Spectra, Optical Properties, Comae, Gases, Distance, Production Rates, Brightness, Magnitude, Calcualtions, Radius, Albedo, Wavelengths, Data, Photometry, Lightcurves, Telescope Methods

Scientific paper

The first direct evidence for the onset of sublimation of a comet nucleus is reported. Emission due to CN observed in spectra of the comet P/Halley provides evidence for the development of the gas coma. Broad-band photometric observations of the comet indicate that the dust coma developed near a preperihelion heliocentric distance r of about 6 AU. Rates of gas production and brightening for the comet have been derived at r of 4-6 AU. The mean preperihelion nuclear magnitude derived for the comet was used to calculate an effective radius of the nucleus, which for plausible values of the geometric albedo lies in the range 1-4 km.

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