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We present the results of a three years monitoring campaigns of the $z =0.024$ type-1 active galactic nucleus (AGN) PGC50427. Through the use ofPhotometric Reverberation Mapping with broad and narrow band filters, wedetermine the size of the broad-line emitting region by measuring the timedelay between the variability of the continuum and the H$\alpha$ emission line.The H$\alpha$ emission line responds to blue continuum variations with anaverage rest frame lag of $19.0 \pm 1.23$ days. Using single epoch spectroscopywe determined a broad-line H$\alpha$ velocity width of 1020 km s$^{-1}$ and incombination with the rest frame lag and adoption a geometric scaling factor $f= 5.5$, we calculate a black hole mass of $M_{BH} \sim 17 \times 10^{6}M_{\odot}$. Using the flux variation gradient method, we separate the hostgalaxy contribution from that of the AGN to calculate the rest frame 5100\AA~luminosity at the time of our monitoring campaign. The rest frame lag and thehost-subtracted luminosity permit us to derive the position of PGC50427 in theBLR size -- AGN luminosity diagram, which is remarkably close to thetheoretically expected relation of $R \propto L^{0.5}$. The simultaneousoptical and NIR ($J$ and $K_{s}$) observations allow us to determine the sizeof the dust torus through the use of dust reverberation mapping method. We findthat the hot dust emission ($\sim 1800K$) lags the optical variations with anaverage rest frame lag of $46.2 \pm 2.60$ days. The dust reverberation radiusand the nuclear NIR luminosity permit us to derive the position of PGC50427 onthe known $\tau - M{V}$ diagram. The simultaneus observations for thebroad-line region and dust thermal emission demonstrate that the innermost dusttorus is located outside the BLR in PGC50427, supporting the unified scheme forAGNs. (Abstract shortened, see the manuscript.)

The broad-line region and dust torus size of the Seyfert 1 galaxy PGC50427