Physics
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a.605l&link_type=abstract
In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 605-607 (SEE N87
Physics
Comet Nuclei, Giacobini-Zinner Comet, Halley'S Comet, Light Curve, Periodic Variations, Emission Spectra, Line Spectra, Molecular Spectra, Space Observations (From Earth), Spectrophotometry
Scientific paper
Photoelectric photometric measurements in the near nucleus zone of comets P/Halley and P/Giacobini-Zinner have been performed at the Wise Observatory during the recent apparitions of these two comets. The results reveal periodic light variations in the two objects, with periods of 52 h and 9.5 h respectively. The variations observed in P/Halley are detected mainly in the radiation in emission lines. They are interpreted as resulting from a periodic modulation of the ejection of the line emitting molecules from the nucleus into the near zone, due to the rotation of the nucleus. A production duration of 30 h is derived for the daughter molecule C2 at the time of the authors' observations. In the P/Giacobini-Zinner case, the variations are found mostly in the continuum radiation and they are interpreted as the reflection of sunlight from the rotating solid nucleus of the comet.
Brosch Noah
Leibowitz Elia M.
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