Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...138l...1l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 138, no. 1, Sept. 1984, p. L1-L4.
Astronomy and Astrophysics
Astronomy
24
Astronomical Photometry, Brightness Distribution, Comet Nuclei, Halley'S Comet, Rotating Matter, Astrometry, Electronography, Light Curve, Spin Dynamics, Comets, Halley, Periodic Comets, Rotation, Physical Properties, Period, Astronomy, Telescopic Observations, Brightness, Optical Properties, Distance, Spin, Amplitude, Magnitude, Comet Nuclei
Scientific paper
Rapid recurring increase of comet P/Halley brightness were observed with the 3.60 meter CFH-Telescope during consecutive nights of February 1984, while the mean heliocentric distance of the comet was 7.95 AU. The measured amplitude in blue light was 1.7 magnitude (between B = +24.5 and B = +22.8) but the true amplitude possibly exceeded 2 magnitudes. This phenomenon seemed to occur at constant time intervals of 24.3 + or - 0.3 hours. Such brightness variations very likely reflect the rotation of the nucleus. Clues to the true spin period are examined. Some alternate interpretations of the observations are suggested.
Baudrand Jacques
Le Fèvre Oliver
Lecacheux J.J.
Lelievre Gerard
Lemonnier Jean-Pierre
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