Observations of Comet P/Halley at minimum phase angle

Details Observations of Comet P/Halley at minimum phase angle Observations of Comet P/Halley at minimum phase angle

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a.553m&link_type=abstract

In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 553-556 (SEE N87

Computer Science

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Comet Nuclei, Halley'S Comet, Spectrophotometry, Backscattering, Cosmic Dust, Gas Jets, Time Series Analysis

Scientific paper

The authors have obtained time-series spectra of comet P/Halley over 8 nights in November 1985 in near backscattering geometry (phase angle 1° ≤ θ ≤ 10°). They have used the spectra to search for enhanced backscattering of the type reported earlier in comet P/Stephan-Oterma and to study the time dependence of the molecular band and continuum emissions. No phase related brightening at minimum phase greater than ≈10% was observed in P/Halley, however two continuum brightness outbursts were observed on UT November 15 and 21. The first of these was associated with a comparable increase in the gas band emission strength, the second was not. The authors interpret the absence of a gas emission increase in the second outburst as evidence for the possible existence of a dust crust on the nucleus. No time delayed brightening was seen at a coma position 40 arcsec west of the nucleus suggesting that either the grains were ejected at velocities below the escape velocity or that they were short-lived icy grains.

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