The nucleus of Comet P/Encke

Details The nucleus of Comet P/Encke The nucleus of Comet P/Encke

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990icar...86...69l&link_type=abstract

Icarus (ISSN 0019-1035), vol. 86, July 1990, p. 69-81. Research supported by NSF.

Astronomy and Astrophysics

Astronomy

48

Aphelions, Astronomical Spectroscopy, Charge Coupled Devices, Comet Nuclei, Encke Comet, Astronomical Photometry, Cometary Atmospheres, Periodic Variations, Comets, Encke, Comet Nuclei, Ccd Methods, Spectra, Photometry, Albedo, Brightness, Optical Properties, Rotation, Period, Spectrometry, Data, Reflectivity, Short-Period Comets, Lightcurve, Shape, Comparisons, Earth-Based Observations, Albedo, Color

Scientific paper

The present CCD images and spectra of P/Encke near its aphelion during August-September 1988 indicates the cyclic character of the comet's brightness variation about a mean apparent red magnitude, with a photometric range of 0.62 + or - 0.04 mag. An aspherical rotating nucleus is judged to be consistent with (1) the observed cyclic variations, (2) the conformity of photometry with the inverse-square law, and (3) the absence of a resolvable coma. CCD spectra of the nucleus show a reddened continuum, in conjunction with a reflectivity gradient smaller than that of the nucleus of P/Tempel 2.

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