NTT Pointing Model Evolution
The pointing model of the NTT is performed by fitting the pointing error of ~60 stars over the whole visible sky using the VLT implementation of TPOINT. The resulting pointing accuracy is typically better than 1". Fig. 1 shows the evolution of the model, and Fig. 2 a typical residual plot.
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Figure 1: Evolution of the Pointing Model
Figure 1: Residuals of the NTT Pointing Model (Nasmyth A, 2001-12-06). The RMS was 0.8"