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The ViSP instrument scientist has supplied a better approximate calibration of the wavelength in the 3 arms, show below in pseudo IDL code.
630nm = 629.495+findgen(1000)*1.285/1000. ; dispersion 1.285 pm /px
397nm = 396.418+findgen(1000)*0.77/1000. ; dispersion 0.77 pm / px
854nm = 853.182+findgen(1000)*1.882/1000. ; dispersion 1.882 pm / px
The ViSP data has incorrect pointing information in the WCS headers. This is not currently correctable.
The units of VSPWID and VSPSLTSS respectively, the Slit Width and Slit Stepping Size are incorrect. VSPWID should be in arcsec and VSPSLTSS should be in mm. This will be corrected in the next ViSP processing run (from March 2023).
| Code Block |
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VSPWID = 0.041 / [um] SlitWidth
VSPSLTSS= 0.619402153042 / [um] SlitSteppingSize |
Optical & Algorithm Improvements & Mitigations
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