Abstract
We report here the first direct evidence for the onset of sublimation of a comet nucleus. Emission due to CN observed in spectra of comet P/Halley (1982i) provides evidence for the development of the gas coma. Broad-band photometric observations of the comet indicate that the dust coma developed near a pre-perihelion heliocentric distance, r∼6AU. We have derived rates of gas production and brightening for comet P/Halley at r ∼ 4–6 AU and use the mean pre-perihelion nuclear magnitude derived for the comet (r >8 AU) to calculate an effective radius of the nucleus (R), which for plausible values of the geometric albedo, pv∼; 0.03–0.6, lies in the range R = 1–4 km.
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Wyckoff, S., Wagner, R., Wehinger, P. et al. Onset of sublimation in comet P/Halley (1982i). Nature 316, 241–242 (1985). https://doi.org/10.1038/316241a0
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DOI: https://doi.org/10.1038/316241a0
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