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We have performed the astrometry of H2O masers in the Galactic star-formingregion Onsala 2 North (ON2N) with the VLBI Exploration of Radio Astrometry.Weobtained the trigonometric parallax of 0.261+/-0.009 mas, corresponding to theheliocentric distance of 3.83+/-0.13 kpc. ON2N is expected to be on the solarcircle, because its radial velocity with respect to the Local Standard of Rest(LSR) is nearly zero. Using present parallax and proper motions of the masers,the Galactocentric distance of the Sun and the Galactic rotation velocity atthe Sun are found to be R_0 = 7.80+/-0.26 kpc and Theta_0 = 213+/-5 km/s,respectively. The ratio of Galactic constants, namely the angular rotationvelocity of the LSR can be determined more precisely, and is found to beOmega_0=Theta_0/R_0 = 27.3+/-0.8 km/s/kpc, which is consistent with the recentestimations but different from 25.9 km/s/kpc derived from the recommendedvalues of Theta_0 and R_0 by the International Astronomical Union (1985).

Astrometry of Galactic Star-Forming Region ON2N with VERA: Estimation of the Galactic Constants