Abstract
This paper reports new photoelectric photometry of the nucleus of P/d'Arrest (1976e) during 4, 5, and 6 August 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 ± 0.02 mag. There is evidence for a period of 5.17 ± 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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