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The goal of this work is a detailed study of the nearby, low power radiogalaxy B2 1144+35B. For this purpose, we performed new Very Long Baseline Array(VLBA) and Very Large Array (VLA) observations. This source has severalproperties (bright, nearby, large range of spatial structures, visiblecounterjet, etc.) that make it an excellent astrophysical laboratory for thestudy of the evolution of radio jets. Here we report the detection of motion inthe counterjet at 0.23 $\pm$ 0.07 c, which allows us to estimate theorientation of the parsec-scale jet at 33$^\circ \pm 7^\circ$ from the line ofsight, with an intrinsic velocity of (0.94$^{+0.06}_{-0.11}$)c. We also reporton a brightening of the core at high frequencies which we suggest could be theresult of a new component emerging from the core. High dynamic range VLBAobservations at 5 GHz reveal, for the first time, extended emission connectingthe core with the bright complex of emission that dominates the flux density ofthe parsec scale structure at frequencies below 20 GHz. The evolution of thisbright complex is considered and its slow decline in flux density isinterpreted as the result of an interaction with the interstellar medium of thehost galaxy.

B2 1144+35B, a giant low power radio galaxy with superluminal motion. Orientation and evidence for recurrent activity