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We report the first detection of an optical millisecond pulsar with the fastphoton counter Aqueye+ in Asiago. This is an independent confirmation of thedetection of millisecond pulsations from PSR J1023+0038 obtained with SiFAP atthe Telescopio Nazionale Galileo. We observed the transitional millisecondpulsar PSR J1023+0038 with Aqueye+ mounted at the Copernicus telescope inJanuary 2018. Highly significant pulsations were detected. The rotationalperiod is in agreement with the value extrapolated from the X-ray ephemeris,while the time of passage at the ascending node is shifted by $11.55 \pm 0.08$s from the value predicted using the orbital period from the X-rays. Anindependent optical timing solution is derived over a baseline of a few days,that has an accuracy of $\sim 0.007$ in pulse phase ($\sim 12$ $\mu$s in time).This level of precision is needed to derive an accurate coherent timingsolution for the pulsar and to search for possible phase shifts between theoptical and X-ray pulses using future simultaneous X-ray and opticalobservations.

Precise optical timing of PSR J1023+0038, the first millisecond pulsar detected with Aqueye+ in Asiago