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We describe the time-dependent properties of a new spectroscopicallyconfirmed Mira variable, which was discovered in 2013 as MASTER-Net OpticalTransient (OT) J212444.87+321738.3 towards the Cygnus constellation. We haveperformed long-term optical/near-infrared (NIR) photometric and spectroscopicobservations to characterize the object. From the optical/NIR light curves, weestimate a variability period of 465 $\pm$ 30 days. The wavelength-dependentamplitudes of the observed light-curves range from $\Delta$I$\sim$4 mag to$\Delta$K$\sim$1.5 mag. The (J-K) color-index varies from 1.78 to 2.62 mag overphases. Interestingly, a phase lag of $\sim$60 days between optical and NIRlight curves is also seen, as in other Miras. Our optical/NIR spectra showmolecular features of TiO, VO, CO, and strong water bands which are a typicalsignature of oxygen-rich Mira. We rule out S- or C-type as ZrO bands at 1.03and 1.06 $\mu$m and $C_2$ band at 1.77 $\mu$m are absent. We estimate theeffective temperature of the object from the SED, and distance and luminosityfrom standard Period-Luminosity relations. The optical/NIR spectra displaytime-dependent atomic and molecular features (e.g. TiO, NaI, CaI, H$_2$O,CO),as commonly observed in Miras. Such spectroscopic observations are useful forstudying pulsation variability in Miras.

Phase-dependent photometric and spectroscopic characterization of the MASTER-Net Optical Transient J212444.87+321738.3: an oxygen rich Mira