Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..569b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 187, no. 1-2, Nov. 1987, p. 569-574.
Astronomy and Astrophysics
Astrophysics
3
Astronomical Spectroscopy, Giotto Mission, Halley'S Comet, Vega Project, Astronomical Photometry, Spectrum Analysis
Scientific paper
The authors describe preperihelion spectroscopic observations of P/Halley while it was beyond 5.6 AU, the reduction procedures they followed, and derive V magnitudes and (g-r) and (V-R) colour indices. They outline two possible interpretations of these observations. The first, which ascribes part of the light in the spectra to reflection from the nucleus and part to reflection from grains in the developing coma, depends on an earlier interpretation of a 54-h periodicity in the comet's brightness in terms of nuclear rotation. Uncertainties in this interpretation due to the discovery of a second photometric periodicity near 7.4 days and evidence of sporadic activity at large heliocentric distances lead the authors to consider a second possible interpretation in which coma particulates maybe entirely responsible for the spectrophotometric behavior.
Belton Michael J. S.
Spinrad Hyron
Wehinger Peter A.
Wyckoff Susan
Yeomans Donald Keith
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