# Supernova 2018aoq and a distance to Seyfert galaxy NGC 4151

## TL;DR

This paper reports optical observations of SN 2018aoq, a Type II-P supernova in NGC 4151, and estimates the galaxy's distance using multiple methods, finding results consistent with geometric measurements.

## Contribution

It provides detailed photometric and spectroscopic data of SN 2018aoq and applies two distance estimation methods to determine NGC 4151's distance.

## Key findings

- Distance estimates of 20.0 ± 1.6 Mpc and 16.6 ± 1.1 Mpc from different methods.
- Results are consistent with geometric distance measurements for NGC 4151.
- SN 2018aoq exhibits typical Type II-P supernova features and intermediate brightness.

## Abstract

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.