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Table 3

SODISM II plate-scale for different wavelengths.

Wavelength [nm] Optical thickness [mm] TPS ACPS SRPS SRPS–ACPS

393.37 12.328 1.060818 1.061076 1.061102 2.63 × 10-5
535.7 (a) 12.297 1.060792 1.061057 1.061060 2.75 × 10-6
535.7 (b) 12.303 1.060796 1.061061 1.061064 2.92 × 10-6
607.1 12.225 1.060757 1.061016 1.061025 9.42 × 10-6
782.2 12.341 1.060781 1.061083 1.061049 − 3.40 × 10-5
1025.0 12.080 1.060679 1.060931 1.060947 1.54 × 10-5

Notes.The optical thickness column corresponds to a characterization of the different filters. SODISM II interference filters do not have the same optical thickness (index, thickness of optical elements used, etc.). Thus, each wavelength has its own plate-scale correction factor. Theoretical plate-scales (TPS in arcsec pixel-1) are obtained from an optical model using the appropriate optical configuration. Angular calibration plate-scales (ACPS in arcsec pixel-1) are obtained during specific campaigns on star doublets. SODISM reference plate-scales (SRPS in arcsec pixel-1) are obtained from the knowledge of the solar radius measured by SODISM at 607.1 nm during the Venus transit. Six digits of the TPS, ACPS, and SRPS entries are significant.

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