Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...148..299s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 148, no. 2, July 1985, p. 299-308. NASA-supported research.
Astronomy and Astrophysics
Astrophysics
27
Astronomical Photometry, Comet Nuclei, Halley'S Comet, Light Curve, Rotation, Albedo, Brightness Distribution, Size Determination, Comets, Halley, Optical Properties, Brightness, Comet Nuclei, Period, Rotation, Calculations, Techniques, Procedure, Photometry, Albedo, Amplitude, Radius, Analysis, Lightcurves, Hypotheses, Data Reduction
Scientific paper
The brightness data on periodic comet Halley from the period October 1982 - February 1984 have been examined for evidence on the nucleus rotation period and projected cross section area. When corrected for heliocentric and geocentric distances and for a phase effect, and reduced to a common photometric system, the data show variations of up to 5:1 in intrinsic brightness, corresponding to a range from 0.48 to 2.40 km2 in the photometric cross section. It is found that rotation periods longer than ≡1 day are the most likely ones. It is suggested that the observed light curve is a composition of periodic and erratic variations, of which only the former are rotation related. Doubts are being expressed as to whether P/Halley's rotation period can at all be determined from photometry.
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