Image Details
Caption: Figure 3.
Example of a target whose astrometric fit uses both Spitzer and unWISE data, but for which a parallactic fit could not be attempted. (Left) A square patch of sky showing the measured astrometry and its uncertainty at each epoch (black points with error bars) plotted in R.A. vs. decl. Points with small error bars are the Spitzer ch2 measurements; those with larger error bars are the WISE W1 and W2 measurements. Blue curve shows the best proper motion fit. Red lines connect each observation to its corresponding time point along the best-fit curve. (Right) The R.A. and decl. residuals from the fit as a function of time. Only the Spitzer data are shown, since the error bars of the WISE points would otherwise dominate the plot.
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