Gunma Astronomical Observatory Echelle Spectrograph ( GAOES )

GAOES
Wavelengths360 - 1000 nm
Resolution75,000 ( slit 1.0" , 3.2 pixels )
120,000 ( slit 0.6" , 2.0 pixels : max )
Slit length 8 arcsec ( 720 µm )
DetectorEEV CCD44-82BI
15 µm × 15 µm pixel
2048 × 4096 pixels
Type Semi-Littrow
Collimator lens system
Cameralens system
Echelle gratingR = 2.8, 31.6 gr/mm
blaze angle ( 70.3 deg )
Cross disperser (red) 250 gr/mm ( blaze 698 nm, 5.0 deg )
(blue) 400 gr/mm ( blaze 415 nm, 4.8 deg )
Efficiency10 %
Limiting magnitude11 mag, S/N = 100, 2 hours
Size1.37 m(D) × 1.74 m(W) × 0.9 m(H)
Weight~ 900 kg
MakerGenesia corporation

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