We present optical photometric observations of SN 2018aoq from 2 to 100 days after explosion, and 7 spectra at epochs from 11 to 71 days. The light curves and spectra are typical for SNe II-P. As previously reported, SN 2018aoq appears to be of intermediate brightness between subluminous and normal SNe II-P. SN 2018aoq was discovered in Seyfert galaxy NGC 4151, for which the distance is uncertain. We utilised the Expanding Photosphere Method using three sets of filter combinations and velocities derived from the absorption minima of FeII lines and obtained a distance of 20.0±1.6 Mpc. The Standard Candle Method applied to SN 2018aoq yields a distance of 16.6±1.1 Mpc. Both values are consistent with the distance measurements for NGC 4151 based on geometric method.

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The object is located approximately in the center one of the very weakly radiating galaxy MCG + 03-30-048 in a large cluster of galaxies in this region. We performed spectral and photometric observations of this object from May 21 to June 23, 2020. Table 1 summarizes our observations: