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We report detection of the binary companion to the millisecond pulsarJ2302+4442 based on the deep observations performed with the Gran TelescopioCanarias. The observations revealed an optical source with $r'$ =23.33$\pm$0.02 and $i'$=23.08$\pm$0.02, whose position coincides with thepulsar radio position. By comparing the source colour and magnitudes with thewhite dwarf cooling predictions, we found that it likely represents a He orCO-core white dwarf and estimated its mass of 0.52$^{+0.25}_{-0.19}$M$_{\odot}$ and effective temperature of 6300$^{+1000}_{-800}$ K. Combining ourresults with the radio timing measurements, we set constraints on the binarysystem inclination angle $i=73^{+6}_{-5}$ degrees and the pulsar mass$m_p=3.1^{+2.7}_{-2.0}$ M$_{\odot}$.

Optical identification of the binary companion to the millisecond PSR J2302+4442 with the Gran Telescopio Canarias