Dynamical masses of young stellar objects with the VLBA: DYNAMO-VLBA. Trigonometric parallaxes and proper motions of YSOs in Orion

We present results from a multi-epoch Very Long Baseline Array (VLBA) survey of compact radio sources in the Orion complex, conducted within both the DYNAMO–VLBA and GOBELINS projects. We detected 216 compact radio sources, of which 58 yielded reliable multi-epoch astrometric solutions. For these sources, we derived trigonometric parallaxes and proper motions with typical precisions of about 0.05 mas and 0.10 mas yr -1 , respectively. The measured parallaxes range between 2.26 and 2.65 mas, corresponding to distances of 380–440 pc, and delineate the depth of the Orion star-forming complex. We determined mean distances of 405 pc for NGC 2068, 403 pc for NGC 2024, 407 pc for the σ Orionis region, 388.5 for the Orion Nebula Cluster, and 438 DR3 astrometry for 28 common sources revealed negligible mean parallax offsets (Deltǎarpi=-0.02 pc for L1641. A comparison with Gaia and small systematic differences in proper motions (∼0.07, reference frame. Our results demonstrate the capability of high-precision radio astrometry to map embedded stellar populations and to provide an independent calibration of the reference system in obscured regions. likely due to the residual rotation of the Gaia Gaia