Updated proper motions for Local Group dwarf galaxies using Gaia Early Data Release 3

Understand

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.