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You are here: Home → Telescopes → Irenee du Pont → Instruments → Specs → Boller and Chivens Spectrograph

Boller and Chivens Spectrograph

Telescope:

  • Focal ratio: f/7.5

Collimator:

  • Focal length: 675 mm

Camera:

  • Focal length: 140 mm

  

Scale:

  • At Focal plane: 10.83 arcsec/mm

  • At Detector: 51.9 arcsec/mm (0.70 arcsec/pixel)

Slit Length:

  • 25 mm (271 arcsec)

Detector:

  • Marconi#1: 2048 x 515 (13.5 µm pixels);  Q.E.  graph

Wavelength Range:

  • 3100-10000 Å

 

Gain, Readout Noise & Readout Time:

Read
Speed		 Gain
e-/ADU		 Read Noise
(e-)		 Read Time
(sec)
Slow 1.0 3.1 21
Fast 0.9 3.3 12
Turbo 1.7 4.3 8.5

 

Gratings:

l/mm Blaze (Å)
(order)		 Dispersion
(Å/pixel)		 Wavelength
Coverage (Å)		 Comment
300 5000 3.0 6230  
600 5000 1.6 3210  
600 7500 1.6 3210  
600 6250(2) 0.80 1630 blaze = 1.25 µm
600 6133(3) 0.52 1060 blaze = 1.84 µm; vignetted!
832 8000 1.2 2360  
1200 4000 0.80 1630  
1200 5000 0.800 1630  
1200 7500 0.80 1630  

 

Blocking Filters:

  • BG38, WG360, GG400, GG420, GG455, GG495, GG570, RG610

Staff Contact:

  •  Mark Phillips (mmp at lco.cl)
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