Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986icar...68..430l&link_type=abstract
Icarus (ISSN 0019-1035), vol. 68, Dec. 1986, p. 430-441. Research supported by the Adler Foundation for Space Research.
Astronomy and Astrophysics
Astronomy
8
Astronomical Photometry, Comet Nuclei, Giacobini-Zinner Comet, Brightness, Color, Light Curve, Periodic Variations, Power Spectra, Spin Dynamics, Statistical Analysis
Scientific paper
The authors observed photometrically P/Giacobini-Zinner, before its 1985 perihelion passage, with the IHW standard filter set. They found a periodicity of 9.5±.2 hr in the lightcurve of a color index of the nuclear region of the comet, which is interpreted as being produced by albedo variations and also possibly by a nonspherical geometry of the spinning nucleus. A statistical analysis indicates that the period found is significant within at least a 97% confidence level. The same analysis, when applied to published data for P/d'Arrest, indicates that any periodicity there is, is significant to within no more than an 80% confidence level. The nucleus of P/Giacobini-Zinner is probably not smaller than 0.6 km.
Brosch Noah
Leibowitz Elia M.
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