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Instrument Apertures and Foci

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Apertures
(Last update: CJD - 14 April '03)
 
Mode Aperture for telescope, arcsec
Spectroscopy 6.4* 0.8*
Imaging 0.12 -7.51 -1.94
Imaging 0.06 -4.60 -0.12
IFU 0.67 0.41
Polarimetry 24.13 1.45
Notes:
* Predicted values: assumes Imaging apertures correct (Olga measured +6.4,+4.3 on 13 April)
1. Use the same aperture for imaging and spectro-polarimetry (tuned for the latter).
2. The arcsec values are simply the mm values x -1.524
3. The first value is E-W, the second N-S, so in the rotated UIST frame the first value is along the slit (up and down, or in Y in pixels - see below)

 

Location on array
Use these numbers for imaging acquisition
(Last update: CJD - 4 April '03)
 
Mode Location on array, (x,y)
Spectroscopy, 1 pix slit 506.4 590
Spectroscopy, 2 pix slit 505.2 590
Spectroscopy, 4 pix slit 502.2 590
Spectroscopy, 5 pix slit 501.5 590
Spectroscopy, 7 pix slit 507.7 590
X-disp Spectros, 3 pix slit 503.5 5412
X-disp Spectros, 5 pix slit 503.4 5412
X-disp Spectros, 7 pix slit 504.0 5412
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 7403

Notes:
1. Centre of rotation is at (x,y)=(495,541)
2. Rough y-axis centre of each cross-dispersed 20" slit, or the top spec-pol slit, on array.
3. 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).

 

Additional offsets during source acquisition
(Last update: CJD - 4 April '03)
 
Grism Filter used Additional offset
by TSS at telescope
IJ J-spec right 0.67 arcsec
Short_K B2 left 0.05 arcsec
Long_K B2 left 0.9 arcsec
KL B2 left 0.9 arcsec
Short_L 3.4cont left 0.1 arcsec
Long_L BrA right 0.17 arcsec
M BrA left 0.15 arcsec

 

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

Previous Values (prior to date):
20030106
20030131
20030403
 

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Last Modification Date: 14 April 2003
Last Modification Author: Chris Davis