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The Blazhko effect in V1820 Orionis and its period were reported for thefirst time by Wils et al. (2006) from a data analysis of the Northern SkyVariability Survey. The results of additional V1820 Orionis observations over atime span of 4 years are presented herein. From the observed light curves, 73pulsation maxima have been measured. The times of light maxima have beencompared to ephemerides to obtain the (O-C) values. The Blazhko period (27.917+/- 0.002 d) has been derived from light curve Fourier analysis and from ANOVAanalyses of the (O-C) values and of magnitudes at maximum light (Mmax). Duringone Blazhko cycle, a hump in the ascending branch of the light curve wasclearly identified and has also created a double maximum in the light curve.The frequency spectrum of the light curve, from a Fourier analysis withPeriod04, has revealed triplet, quintuplet structures, and a second Blazhkoweak modulation (period = 34.72 +/-0.01 d). V1820 Orionis can be ranked as astrongly modulated star based on its observed amplitude and phase variations.The amplitude ratio of the largest triplet component to main pulsationcomponent is quite large: 0.34.

V1820 Orionis : an RR Lyrae star with strong and irregular Blazhko effect