Galactic kinematics from data on open star clusters from the MWSC catalogue

Open star clusters from the MWSC (Milky Way Star Clusters) catalogue have been used to determine the Galactic rotation parameters. The circular rotation velocity of the solar neighborhood around the Galactic center has been found from data on more than 2000 clusters of various ages to be V (0) = 236 +/- 6 km s(-1) for the adopted Galactocentric distance of the Sun R (0) = 8.3 +/- 0.2 kpc. The derived angular velocity parameters are Omega (0) = 28.48 +/- 0.36 km s(-1) kpc(-1), Omega'(0) = -3.50 +/- 0.08 km s(-1) kpc(-2), and Omega aEuro(0)(3) = 0.331 +/- 0.037 km s(-1) kpc(-3). The influence of the spiral density wave has been detected only in the sample of clusters younger than 50 Myr. For these clusters the amplitudes of the tangential and radial velocity perturbations are f (theta) = 5.6 +/- 1.6 km s(-1) and f (R) = 7.7 +/- 1.4 km s(-1), respectively; the perturbation wavelengths are lambda (theta) = 2.6 +/- 0.5 kpc (i (theta) = (-1)1au broken vertical bar +/- 2au broken vertical bar) and lambda (R) = 2.1 +/- 0.5 kpc (i (R) = -9au broken vertical bar +/- 2au broken vertical bar) for the adopted four-armed model (m = 4). The Sun's phase in the spiral density wave is (chi(aS (TM)))(theta) = -62au broken vertical bar +/- 9au broken vertical bar and (chi(aS (TM)))(R) = -85au broken vertical bar +/- 10au broken vertical bar from the residual tangential and radial velocities, respectively.