The photometric period of 39 AY Ceti
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Photoelectric photometry obtained in 1971 and 1972 is compared with that obtained in 1980-81 and 1981-82 to derive a photometric period of 77d.65. JD 2444636.0 is an epoch of minimum light. The full amplitude has been as large as 0m.18 in V. Curiously, the mean light level has dropped by almost 0m.2 over the last ten years. This binary is additionally interesting because of the recently discovered white dwarf secondary component and because unpublished radial velocity measures of Fekel show a large (0.1) eccentricity and an orbital period (57d.1) very different from our photometric period. 1983 D. Reidel Publishing Co.