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We present 5 GHz space-VLBI observations of the quasar pairB1342+662/B1342+663 that demonstrate the feasibility of phase-referencetechniques using an antenna in space. The space-based data were taken by thesatellite HALCA, of the space-VLBI mission VSOP. From residual (referenced)phases we derive an upper bound of 10 meters to the uncertainty of thespacecraft orbit reconstruction. An analysis of the phase-reference maps of thesources additionally suggests that the above mentioned uncertaintyis likely notlarger than 3 meters. With errors of this magnitude, HALCA is a useful tool forastrometric studies of close pairs of radio sources.Comment: Accepted for publication in A&A, 5 pages, 5 figures, needs aa.cl

Space-VLBI phase-reference mapping and astrometry