Analysis of over 40 years of eclipse timings reveals a significant period derivative in FO Aquarii, indicating orbital period changes.
We combine more than 40 years of eclipse timings of the intermediate polar FO Aqr and derive new orbital ephemerides. The eclipse times are best fit with a second order polynomial, implying an $8σ$ detection of a period derivative. The results show that the orbital period of FO Aqr is currently increasing, with a derivative of Ṗ=6.65±0.81×10⁻¹¹.
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Garnavich et al. (2025) studied this question.
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