Photoelectric discovery of a 52-hr periodicity in the nuclear activity of P/Halley

Details Photoelectric discovery of a 52-hr periodicity in the nuclear activity of P/Halley Photoelectric discovery of a 52-hr periodicity in the nuclear activity of P/Halley

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986icar...68..418l&link_type=abstract

Icarus (ISSN 0019-1035), vol. 68, Dec. 1986, p. 418-429. Research supported by the Adler Foundation for Space Research.

Physics

13

Comet Nuclei, Electrophotometry, Halley'S Comet, Spin Dynamics, Carbon, Color, Emission Spectra, Light Curve, Periodic Variations, Power Spectra, Water

Scientific paper

Intermediate band photometric observations of P/Halley performed in November and December 1985 at the Wise Observatory reveal a cycle of 52-hr in the lightcurve emitted from the near-nucleus zone. Significant periodic variations have been found in the color index M(5140)-M(7000), i.e., the magnitude difference between measurements through two bandpass filters centered around emisson lines of C2 and of H2O+, respectively. The periodic line variation is interpreted as the modulation of the molecular density of the two species in the inner coma caused by variation in mass ejection from the spinning nucleus of the comet.

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