The Center of Expansion and Age of the Oxygen-rich Supernova Remnant 1E 0102.2-7219

We present new proper motion measurements of optically emitting oxygen-rich knots supernova remnant 1E 0102.2-7219 (E0102), which are used to estimate the remnant's center expansion and age. Four epochs high resolution Hubble Space Telescope images spanning 19 yr were retrieved analyzed. found a robust alpha=1:04:02.48 delta=-72:01:53.92 (J2000) with 1-sigma uncertainty 1.77 arcseconds using 45 from obtained Advanced Camera for Surveys F475W filter in 2003 2013 having highest signal-to-noise ratio. also an upper limit explosion age 1738 +/- 175 by selecting motions, that assumed be least decelerated. find evidence asymmetry motions as function position angle. conclude these asymmetries most likely caused interaction between E0102's original blast wave inhomogeneous surrounding environment, opposed intrinsic asymmetry. The observed non-homologous suggests use free model inaccurately offsets leads overestimated discuss our findings they compare previous estimates E0102 their relevance recently identified candidate central compact object.