The light curve of the nucleus of comet d'Arrest

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Photometry, Comet Nuclei, Electrophotometry, Light Curve, Brightness, Periodic Variations, Spectrum, Comets, Photometry, D'Arrest, Comet, Perihelion, Light (Visible Radiation), Optical Properties, Electric Field Generation, Brightness, Orbits, Light Curve, Nucleus

Scientific paper

This paper reports new photoelectric photometry of the nucleus of P/d'Arrest (1976e) during August 4, 5, and 6, 1976 (UT), just before perihelion passage. The comet appeared as a bright stellar nucleus with a faint surrounding coma. The average visual magnitude from the nuclear region (16-arcsec diaphragm) was 11.60. The visual brightness varies with an amplitude of 0.15 plus or minus 0.02 mag. There is evidence for a period of 5.17 plus or minus 0.01 hr. We interpret such a periodic variation as due to the rotation of the nucleus. The colors of the nuclear region are very similar to those of a solar-type star, and they do not vary significantly with aspect angle.

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