Updated systemic proper motion estimates for 58 Milky Way satellite galaxies, based on Gaia Early Data Release 3 (EDR3), are provided. This sample is identical to that studied by McConnachie & Venn (2020) and the methodology is essentially unchanged from the original paper. The superiority of Gaia EDR3 compared to Gaia Data Release 2 means that Bo{\"o}tes 4, Cetus 3, Pegasus 3 and Virgo 1 have detectable systemic proper motions for the first time. For the entire galaxy sample, the median random uncertainties in the systemic proper motions are approximately a factor of two better than the previous estimates using Gaia DR2. Relevant systematic errors, which are also a factor of two smaller, dominate over random uncertainties for 25 out of the 58 objects in the sample.
@article{arxiv.2012.03904,
title = {Updated proper motions for Local Group dwarf galaxies using Gaia Early Data Release 3},
author = {Alan W. McConnachie and Kim A. Venn},
journal= {arXiv preprint arXiv:2012.03904},
year = {2020}
}