Astrometric fit for CWISEP J023842.60−133210.7. (Upper left) A square patch of sky showing the measured coordinates and their uncertainties at each epoch (black points with error bars). Points with small error bars are the Spitzer and HST measurements, labeled for clarity; those with larger error bars are the unWISE measurements. The blue curve shows the best fit from the vantage point of Spitzer. The orange curve shows the same fit as seen from the vantage point of WISE/NEOWISE and HST (i.e., the Earth). Red lines connect each observation to its corresponding point along the best-fit curve. (Upper right) A square patch of sky centered at the mean position of the target. The green ellipse is the parallactic fit. For clarity, only the Spitzer and HST measurements are shown, in blue and orange, respectively. Though not shown, the unWISE measurements are included in the fit. Again, red lines connect the time of the observation with its prediction. In the background is the ecliptic coordinate grid, with lines of constant β shown in solid pale purple and lines of constant λ shown in dashed pale purple. (Lower left) The change in R.A. and decl. as a function of time with the proper motion component removed. The parallactic fit from the vantage point of Spitzer is shown in blue, and from the vantage point of HST is shown in orange. Again, only the Spitzer and HST measurements are shown, in blue and orange respectively. (Lower right) The R.A. and decl. residuals from the fit as a function of time. As with the lower left panel, only the Spitzer and HST data are shown, in blue and orange, respectively.