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Instrument Apertures and Foci

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Apertures
(Last update: CJD - 6 Jan '03)
 
Mode Aperture for cfg, mm Aperture for telescope, arcsec
Spectroscopy -0.03 -0.47 0.05 0.72
Imaging 0.12 4.82 1.19 -7.35 -1.81
Imaging 0.06 2.98 0.20 -4.55 -0.31
IFU -0.03 -0.11 0.05 0.16
Polarimetry -15.38 -0.95 24.13 1.45
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 0.80
Imaging, 0.12 0.80
Imaging, 0.06JHK 0.90
Imaging, 0.06LM 0.75
IFU 1.0
Pol 0.80

 

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