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Instrument Apertures and Foci

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Apertures
(Last update: CJD - 31 Jan '03)
 
Mode Aperture for cfg, mm Aperture for telescope, arcsec
Spectroscopy 0.36 -0.42 -0.55 0.64
Imaging 0.12 4.93 1.27 -7.51 -1.94
Imaging 0.06 3.02 0.08 -4.60 -0.12
IFU -0.44 -0.27 0.67 0.41
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).
3. The arcsec values are simply the mm values x -1.524

 

Location on array
Use these numbers for imaging acquisition
(Last update: CJD - 13 March '03)
 
Mode Location on array, (x,y)
Spectroscopy, 1 pix slit 506.4 541
Spectroscopy, 2 pix slit 505.2 541
Spectroscopy, 4 pix slit 502.2 541
Spectroscopy, 5 pix slit 501.5 541
Spectroscopy, 7 pix slit 507.7 541
X-disp Spectros, 3 pix slit 503.5 5411
X-disp Spectros, 5 pix slit 503.4 5411
X-disp Spectros, 7 pix slit 504.0 5411
Spec-Pol, 2 pix slit 510.6 7402
Spect-Pol, 5 pix slit 511.6 7402
IFU 497 542
Imaging, 1024x1024 480 480
Imaging, 512x512 224 224
Imaging Polarimetry 511 7402

Notes:
1. Rough y-axis centre of each cross-dispersed 20" slit on array.
2. For polarimetry, in imaging mode 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 5-pixel 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: 31 January 2003
Last Modification Author: Chris Davis