A photometric study of the nonrelaxed cluster Mayer 3

The astrophysical parameters of the open star cluster Mayer 3 were estimated using observations at the Newtonian focus (f/4.84) of the 1.88 m telescope at Kottamia Observatory in Egypt. The V RI observations were carried out down to a limiting magnitude of V approximate to 20 mag. To determine membership and estimate the astrophysical parameters, V RI, near-infrared Two Micron All Sky Survey (2MASS) and Gaia DR2 data were used. The core and tidal radii, radial density distribution, color-magnitude diagrams, distance, age, and reddening of Mayer 3 are presented. The luminosity and mass functions, and the total mass of the cluster are estimated. Finally, we conclude that Mayer 3 is not dynamically relaxed as the relaxation time estimated is much larger than the cluster's age.