Optical data for the SOAR telescope and instruments

Note that for focal lengths and f/ratios two values are given: the first one is the working value and is used to compute the plate scales etc., while the second one is the paraxial value to be used for "calculating backwards". The difference between the working and paraxial values for the telescope is very small; it is significant for the faster beams at the guider foci. The entrance pupil value is determined by the primary mirror baffle which has a diameter of 4100mm.

SOAR telescope as built Optical Specifications:

M1 total diameter

4300mm
Entrance Pupil Diameter 4100mm
Pupil central Obstruction 980mm
M1 working f/# 1.6855
SOAR focal plane working f/# 16.625
SOAR EFL 68176.3mm
Gamma ratio (dZ(foc)/dZ(M2)) 100.5
Zero-Vignetting Field Diameter 14.4 arcmin (without baffles)
10 arcmin (with added baffles)
Focal Plane Radius of curvature 966.3mm
Sag w/r to Maximum Field 10.59mm

 

Nasmyth Foci at the Instrument Support Boxes:

Entrance Pupil diam.

4100mm

 

EFL

68162.5mm

68176.3mm

f/#

16.625

16.628

Plate Scale

330.53 um/arcsec

3.025 arcsec/mm

Field diameter

14.4 arcmin (no vignetting)

 

Back-focal distance 150 mm (side ports)
200 mm (director ports)
 

 

OPT_ISB TTGuider:

Entrance pupil diam. 4100mm  
EFL 13445.1mm 12579.9mm
F/# 3.279 3.068
Plate Scale 65.20 um/arcsec = 15.3 arcsec/mm = 0.37 arcsec/pix
Pixel size 24um  
Field diameter 8 arcsec  

 IR_ISB TTGuider:

Entrance pupil diam. 4100mm
EFL 17056mm
F/# 4.16
Plate Scale 82.76 um/arcsec= 12.08 arcsec/mm = 0.29 arcsec/pix.
Pixel size 24um
Field diameter 8 arcsec

 

 CWFS acquisition camera:

Scale SOAR scale x Magnif.factor
Scale 329.847x0.606= 0.20 mm/arcsec = 5.00 arcsec/mm = 0.12 arcsec/pix
Pixel size 24um
Aquisition Field 2.05 arcmin

 

 CWFS Shack-Hartmann camera:

scale SOAR scale x 60/246.492
scale 80 um/arcsec = 12.46 arcsec/mm = 0.30 arcsec/pix
Pixel size 24um

 

SOAR Optical Imager:

Exit pupil diam. 617.272mm
Exit Pupil position -6073.094mm
Entrance Pupil diam. 4100mm
EFL 40303.1mm 40294.9 mm
F/# 9.83 9.828
Scale 195.4 um/arcsec = 5.12 arcsec/mm = 0.077 arcsec/pix
Pixel size 15um
SOI Field 5.24 x 5.24 arcmin^2
Field Diag. 7.4 arcmin

 

SOI TT Guider:

Entrance Pupil Diam. 4100mm
EFL 22796mm 20759.1mm
F/# 5.56 5.06
Scale 110.5 um/arcsec = 9.05 arcsec/mm = 0.22 arcsec/pix
Pixel size 24um
Guiding Field 6.34 x 6.34 arcsec^2
Field Diag. 9 arcsec

 

 

Goodman Spectrograph

Scale 10 arcsec/mm = 0.15 arcsec/pix
Pixel size 15um
Detector Fairchild 4096 x 4096 pixels
Full field in imaging mode Circular: 7.2 arcmin diameter (3096x3096 unbinned pixels)
Full field in spectroscopic mode Rectangular: 4096 x 1896 unbinned pixels
Length of single slit 3.9 arcmin (1560 unbinned pixels)

 

Goodman Acquisition Camera (GACAM)

Camera Prosilica GC650 Monochrome camera, 659x493 pixels
Scale 43.5 um/arcsec = 23 arcsec/mm = 0.17 arcsec/pix
Field of view 84 x 112 arcsec = 1.4 x 1.87 arcmin
Pixel size 7.4um

 

SOAR Adaptive Optics Module (SAM)

Detector 4096 (horizontal) x 4112 (vertical) pixel CCD231-84 from e2v
Scale 330.03/ um/arcsec = 3.03 arcsec/mm = 0.0455 arcsec/pix
Field of view 186 x 186 arcsec = 3.1 x 3.1 arcmin
Pixel size 15um

SPARTAN - Infrared Imager

Detector 4 x HAWAII-2 HgCdTe - 2048 x 2048 pixels each
Focal Ratio F/21 - Wide Field Mode / F/12 - High Resolution not really useful
Plate Scale 66 mili-arcsec / pixel / 40 mili-arcsec / pixel
Field width per detector 2.25 arcmin / 1.36 arcmin
Blank strip width 0.56 arcmin / 0.34 arcmin
Full field width 5.04 arcmin / 3.05 arcmin