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The recently discovered transitional millisecond pulsar system J1023+0038exposes a crucial evolutionary phase of recycled neutron stars formultiwavelength study. The system, comprising the neutron star itself, itsstellar companion, and the surrounding medium, is visible across theelectromagnetic spectrum from the radio to X-ray/gamma-ray regimes and offersinsight into the recycling phase of millisecond pulsar evolution. Here, wereport on multiple-epoch astrometric observations with the Very Long BaselineArray (VLBA) which give a system parallax of 0.731 +/- 0.022 milliarcseconds(mas) and a proper motion of 17.98 +/- 0.05 mas/yr. By combining our resultswith previous optical observations, we are able to use the parallax distance of1368+42-39 pc to estimate the mass of the pulsar as 1.71 +/- 0.16 solar masses,and we are also able to measure the 3D space velocity of the system as 126 +/-5 km/s. Despite the precise nature of the VLBA measurements, the remaining ~3%distance uncertainty dominates the 0.16 solar mass error on our mass estimate.

A parallax distance and mass estimate for the transitional millisecond pulsar system J1023+0038