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The results of an observation campaign of V0784 Ophiuchi over a time span oftwo years have revealed a multi-periodic Blazhko effect. A Blazhko effect forV0784 Ophiuchi has not been reported previously. From the observed lightcurves, 60 pulsation maxima have been measured. The Fourier analyses of the(O-C) values and of magnitudes at maximum light have revealed a main Blazhkoperiod of 24.51 days but also two other secondary Blazhko modulations withperiods of 34.29 and 31.07 days. A complete light curve Fourier analysis withPERIOD04 has shown triplet structures based on main and secondary Blazhkofrequencies close to the reciprocal of Blazhko periods measured from the 60pulsation maxima.

V0784 Ophiuchi: an RR Lyrae star with multiple Blazhko modulations