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The most intriguing question of modern astronomy is the question of ourUniverse formation. The Hubble diagram analysis with Type Ia Supernovae (SNeIa) is widely used to estimate the cosmological parameters with high accuracy.The cosmological measurements allow us to better understand the early stages ofthe Universe evolution. Nevertheless, the redshift on the SN Ia Hubble diagramincludes the contribution from the unknown peculiar velocities that decreasesthe accuracy of such measurements. We consider the contamination of peculiarvelocities of the host galaxies for those SNe that exploded in galaxy clusters.For this purpose, we use the Pantheon cosmological sample and offer theprocedure to minimise the influence of such uncertainties.

The Influence of the Peculiar Velocities of SNe Ia in Clusters of Galaxies on the Redshift Measurements