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Instrument Apertures and Foci

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Apertures
 
Mode Aperture for cfg, mm Aperture for telescope, arcsec
Spectroscopy -0.36 -1.32 0.55 2.02
Imaging 0.12 4.82 1.19 -7.35 -1.81
Imaging 0.06 2.85 0.07 -4.35 -0.11
IFU -0.36 -0.63 0.55 0.96
Polarimetry 22.65 1.19 -35.54 -1.81
Notes:
1. Centre of rotation is at (x,y)=(495,541)
2. Use the same aperture for imaging and spectro-polarimetry (tuned for the latter).

Location on array
(use these numbers for imaging acquisition)
(Last update: CJD - 6 Jan '03)
 
Mode Location on array, (x,y)
Spectroscopy, 1 pix slit 507.5 541
Spectroscopy, 2 pix slit 506 541
Spectroscopy, 3 pix slit 502.5 541
Spectroscopy, 4 pix slit 503 541
Imaging, 1024x1024 480 480
Imaging, 512x512 224 224
IFU 497 542
Polarimetry 509 740

Notes:
1. For polarimetry, in imaging mode (i.e. WITHOUT the prism in the beam), putting a star on the above location will put the star in the center of the top slit in the spec-pol-mask (or the centre of the top aperture in the imaging-pol-mask).

Telescope foci
 
Mode Focus, mm
Spectroscopy 0.65
Imaging, 0.12 0.65
Imaging, 0.06JHK 0.88
Imaging, 0.06LM 0.65
IFU 1.0
Pol 0.72

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Last Modification Date: 07 January 2003
Last Modification Author: Chris Davis