Trigonometric Parallax of the Protoplanetary Nebula OH 231.8+4.2

We report a trigonometric parallax measurement for the H₂O masers around the protoplanetary nebula OH 231.8+4.2 carried out with the Very Long Baseline Array (VLBA). Based on astrometric monitoring for 1 year, we measured a parallax of 0.65 +/- 0.01 mas, corresponding to a distance of 1.54 ^+0.02 _-0.01 kpc. The spatial distribution of H₂O masers is consistent with that found in the previous studies. After removing the average proper motion of 1.4 mas yr^-1, corresponding to 10 km s^-1, the internal motions of the H₂O maser spots indicate a bipolar outflow.