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We present the updated orbital solution for the transient Be X-ray binary V0332+53 comple- menting historical measurements with the data from thegamma-ray burst monitor onboard Fermi obtained during the outburst inJune-October 2015. We model the observed changes in the spin- frequency of thepulsar and deduce the orbital parameters of the system. We significantlyimprove existing constrains and show that contrary to the previous findings nochange in orbital parameters is required to explain the spin evolution of thesource during the outbursts in 1983, 2005 and 2015. The reconstructed intrinsicspin-up of the neutron star during the latest outburst is found to becomparable with previosly observed values and predictions of the accretiontorque theory.

Orbital parameters of V 0332+53 from 2015 giant outburst data