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We present the results of our analysis of Gaia19dke, an extraordinarymicrolensing event in the Cygnus constellation that was first spotted by the{\gaia} satellite. This event featured a strong microlensing parallax effect,which resulted in multiple peaks in the light curve. We conducted extensivephotometric, spectroscopic, and high-resolution imaging follow-up observationsto determine the mass and the nature of the invisible lensing object. Using theMilky Way priors on density and velocity of lenses, we found that the dark lensis likely to be located at a distance of $D_L =(3.05^{+4.10}_{-2.42})$kpc, andhas a mass of $M_L =(0.51^{+3.07}_{-0.40}) M_\odot$. Based on its lowluminosity and mass, we propose that the lens in Gaia19dke event is an isolatedwhite dwarf.

Lens mass estimate in the Galactic disk extreme parallax microlensing event Gaia19dke