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The present study collects 456 new times of maximum light of the classicalCepheid RT Aur, covering the period from 1897 to 2022. The O-C diagramresulting from these observations shows that the period given by the GCVS hasto be corrected. It results that no strong period variation is found. However,the observed O-C residuals show a long term periodic trend. In the hypothesisof RT Aur being in a binary system, an orbit cannot be deduced from theavailable astrophysical data.

A new value of the period of the classical Cepheid RT Aur on the basis of 456 times of maximum, 1897-2023