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To estimate the parameters of the Galactic spiral structure - namely, thepitch angle i and the number of spiral arms,- data on Galactic masers withknown trigonometric parallaxes were used. We applied the well-known methodbased on analysis of the "position angle - distance logarithm" diagram.Estimates of the pitch angle i obtained from four segments of different armsbelonging to the global Galactic structure are self-consistent and close toi=-13+/-1 degrees. The segment which is most interesting is that of the Outerarm. It contains only three masers. Hence, in order to obtain correctestimates, we also used the data on 12 very young star clusters with distancesdetermined by Camargo et al. from infrared photometry. The estimates obtainedallow us to conclude in favor of the four-armed model of the Galactic spiralstructure.

The Milky Way Spiral Structure Parameters from Data on Masers and Selected Open Clusters