Analysis of H2O masers in Sharpless 269 using VERA archival data-Effect of maser structures on astrometric accuracy

► Reanalyzing VERA archival data of S269, maser structures are different from those reported in previous paper. ► The discrepancy is ∼0.1-0.2 mas, which is caused by insufficient procedures in previous paper. ► We found that change of relative positions of maser spots reaches 0.1 mas between observational epochs. ► Therefore the annual parallax of S269 could not be determined within an error of ∼0.1 mas.