A systematic analysis of VLBI observations of the superluminal radio source 3 C 345 is presented. Observation frequencies range from 2.3 to 89 GHz, and epochs are from 1979.25 through 1984.11. A newly ejected knot (C4) accelerates, changes position angle, and undergoes a large flux outburst. Older knots C2 and C3 have different speeds, little or no acceleration, and different position angles. The flux of C3 decays, and its spectrum steepens. The moving knots define an opening angle of about 27 deg and show direct evidence of expansion. The counterjet-to-jet flux ratio is -0.007 + or 0.007.
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Biretta et al. (1986) studied this question.