Wavelength |
0.8-5.5 microns |
Detector |
InSb (indium antimonide)
Hughes SBRC
256 x 256 pixels
30 micron pixels (38.4" x 38.4")
noise floor = 75 electrons (best timing patterns) |
Pixel scale |
0.15 arcsec/pixel (38.4" square field)
0.0206 arcsec/pixel (5.3" square field) with image converter |
Electronics (IRE) |
4 channel parallel readout
16 bit (500 kHz) or 12 bit (2 Mhz) selectable ADCs
coadd 1-128 frames |
Motors |
Stepper motors:
Inner filter wheel
Outer filter wheel
Slits
Slit mask
Tertiary mirror, yaw
Tertiary mirror, pitch
DC:
Tertiary mirror cover |
Filters |
Two wheels, 20 positions per wheel, for 19mm filters. |
Slits |
1.5, 2.5, 3.5, 4.5, 8.5, and 16.5 pixel wide slits
Occulting finger |
Spectral Resolution |
lambda/d(lambda) = 164 for 2 pixel slit (all grisms) |
Sensitivity |
K: 1 sigma, 20.4 mag in 1 sec in 1 arcsec box (or 22.3 mag., 10 sigma in
1 hour) |
Optics |
CaF2 window
CaF2 + LiF aspheric achromatic doublet
Gold coated tertiary mirror
Gold coated parabolic field mirror
Gold coated fold mirror |
Dewar |
13 in. octagon 51 in. in length
40 liter LN2 tank (3.5 day hold time)
15 liter Lhe tank (1.5 day hold time) |
Image converter |
Magnification: 7.292
f/ratio: 182.3
Pixel size: 0.0206 arcsec
Field size: 5.27 arcsec
Optics: 2 flat mirrors, 1 convex sphere, 1 concave sphere, followed by 1
more flat mirror (all gold or gold overcoated) |