A nearby cool white dwarf candidate in Gemini

We report the identification of one nearby cool white dwarf candidate in Gemini. The object is called PSS 309-6 or 2MASS 06562998+3002455 and its identification came as a result of a search in SIMBAD at CDS. With uncorrected colors B − V = 1.52 ± 0.23, V − J = 2.61 ± 0.12, V − H = 2.82 ± 0.15, V − KS = 3.37 ± 0.15, J − H = 0.21 ± 0.15, H − KS = 0.55 ± 0.17, J − KS = 0.76 ± 0.13, it exhibits a proper motion of 131-2+3mas/yr. The photometric properties of this object appear to be consistent with those obtained in cool, helium-rich atmosphere white dwarf numerical models. If our interpretation is correct, the object may be a cool white dwarf of the Galactic old thin disk population with a temperature of about 4000 K, mass likely below 0.6M⊙ and a rough distance estimate of 17-43 pc with a heliocentric space velocity of (U, V, W) = (2.3, −27.7, −2.9) ± (1.0, 12.0, 1.3) km/s.