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: |
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|
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: |
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Entrance Pupil diam. |
4100mm |
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|
EFL |
68162.5mm |
68176.3mm |
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f/# |
16.625 |
16.628 |
|
Plate Scale |
330.53 um/arcsec |
3.025 arcsec/mm |
|
Field diameter |
14.4 arcmin (no vignetting) |
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| Back-focal distance | 150 mm (side ports) 200 mm (director ports) |
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CWFS acquisition camera: |
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| 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: |
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| 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: |
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| 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 |
Updated on May 19, 2021, 10:45 am