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Table 1

Parameters of the camera response, for frames taken from six different shooting sequences with the left (rows L1–L6) and right (rows R1–R6) cameras. All runs were shot on consecutive nights, except for #2–#4 which were produced on the same night, and #6 obtained four months later. Figures 2 and 3 correspond to row R2. The focal length f1 was converted from pixels to mm assuming a pixel size of 8.40 μm. The errors quoted on the parameters f1 , f3 , f5 , Δ x, Δy are those returned by the non-linear fitting procedure, based on the assumed discretization error on star location. The two rightmost columns show the mean and maximum discrepancy between the measured and modelled positions of the Nm stars found in the frame.

Camera & run Nm f1 (mm) 1000f3f1 1000f5f1 Δx (pixels) Δy (pixels) Mean discr. (pixels) Max discr. (pixels)
L1 22 9.811 ± 0.003 –6.1 ± 0.5 3.8 ± 0.3 –17.7 ± 0.5 6.0 ± 0.4 0.30 0.71
L2 28 9.815 ± 0.003 –7.0 ± 0.4 4.4 ± 0.2 –19.8 ± 0.4 –0.1 ± 0.4 0.29 0.68
L3 27 9.817 ± 0.003 –7.4 ± 0.4 4.5 ± 0.2 –19.0 ± 0.4 –0.0 ± 0.4 0.34 0.66
L4 25 9.819 ± 0.003 –8.2 ± 0.4 5.0 ± 0.3 –21.2 ± 0.4 0.3 ± 0.4 0.31 0.58
L5 22 9.818 ± 0.003 –6.6 ± 0.5 4.0 ± 0.3 –7.7 ± 0.5 2.0 ± 0.3 0.41 1.07
L6 23 9.859 ± 0.004 –5.6 ± 0.6 3.0 ± 0.4 –10.2 ± 0.4 4.3 ± 0.3 0.33 0.98
R1 23 9.890 ± 0.003 –5.8 ± 0.5 3.8 ± 0.3 14.0 ± 0.5 5.0 ± 0.4 0.21 0.42
R2 25 9.891 ± 0.003 –5.3 ± 0.5 2.9 ± 0.3 13.9 ± 0.4 5.3 ± 0.5 0.26 0.58
R3 23 9.893 ± 0.003 –6.7 ± 0.4 4.3 ± 0.3 14.1 ± 0.5 4.8 ± 0.5 0.22 0.44
R4 23 9.885 ± 0.004 –3.7 ± 0.6 1.9 ± 0.5 14.2 ± 0.4 4.9 ± 0.5 0.26 0.55
R5 25 9.897 ± 0.003 –8.3 ± 0.4 5.6 ± 0.2 8.1 ± 0.5 0.4 ± 0.3 0.28 0.53
R6 22 9.888 ± 0.004 –5.3 ± 0.6 3.4 ± 0.3 20.5 ± 0.4 8.8 ± 0.3 0.33 0.85

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