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We have studied a sample containing about 6000 OB stars with proper motionsand trigonometric parallaxes from the Gaia DR2 catalogue. The followingparameters of the angular velocity of Galactic rotation have been found:$\Omega_0=29.70\pm0.11$ km s$^{-1}$ kpc$^{-1}$, $\Omega'_0=-4.035\pm0.031$ kms$^{-1}$ kpc$^{-2}$, and $\Omega''_0= 0.620\pm0.014$ km s$^{-1}$ kpc$^{-3}$.The circular rotation velocity of the solar neighborhood around the Galacticcenter is $V_0=238\pm5$ km s$^{-1}$ for the adopted Galactocentric distance ofthe Sun $R_0=8.0\pm0.15$ kpc. The amplitudes of the tangential and radialvelocity perturbations produced by the spiral density wave are$f_\theta=4.4\pm1.4$ km s$^{-1}$ and $f_R=5.1\pm1.2$ km s$^{-1}$, respectively;the perturbation wavelengths are $\lambda_\theta=1.9\pm0.5$ kpc and$\lambda_R=2.1\pm0.5$ kpc for the adopted four-armed spiral pattern. The Sun'sphase in the spiral density wave is $\chi_\odot=-178^\circ\pm12^\circ$.

Galactic Rotation Based on OB Stars from the Gaia DR2 Catalogue