THE SOLAR MOTION .3. FROM SPACE VELOCITIES

This paper provides the solar motion elements derived from the space v elocities of 5700 stars from the ''Bright Star Catalogue''. It is show n that because of the errors in proper motions, stars brighter than ab out M = 0 do not have, at present, usable space velocities. A discussi on of the results of the present and of the previous papers leads to a standard solar motion defined by l = 52-degrees, b = 22-degrees and V = 20 km s-1, with uncertainties of +/- 3-degrees, +/- 3-degrees and /- 1 km s-1 respectively. We confirm that the dispersion of the peculi ar velocity components increases systematically with age. We redefine the standard solar motion as the motion of the Sun with respect to nor mal stars (i.e. having MK types without spectral particularities) of t he BS catalogue. It corresponds to that of stars younger than 10(9.5) yr, with distances less than one Kpc from the Sun.