Palomar 200-inch Telescope:

Telescope:

• Cassegrain; f/70

Detector:

• Rockwell 128 × 128 Si:As BIB
• Pixel size: 75µ
• Well depth: 3 × 10⁶ e^- (linear range)

Wavelength:

• 8µ to 13µ

Operating Modes:

• Camera, LoRes Spectrograph, and HiRes Spectrograph; selected by observer.
• Time to change between modes ~10 seconds.

Camera Mode:

• Scale: 0.25 arcsec/pixel
• Field:
  • 15 arcsec (unvignetted)
  • 64 × 64 pixels
• Filters:
  • OCLI silicate filters
  • 7.9µ, 8.8µ, 9.5µ, 10.3µ, 11.7µ, 12.5µ [~1µ]
• Sensitivities: (1 in 100 seconds on-source time)
  • NEFD = 2.3 mJy/pixel
  • NEB = 37 mJy/"
  • Point Source = 16 mJy

Spectrograph Mode:

• Scale: 0.25 arcsec/pixel (spatial)
• Format:
  • 64 pixels (spatial)
  • 128 pixels (spectral)
• Filters: (order-sorting)
  • 7.5µ - 12µ
  • 9.5µ - 14µ
• Slits:
  • Length: 15 arcsec
  • Widths: ½, 1, 2, 4 arcsec
• Modes:

  Mode	Dispersion µ/pixel	Resolving Power /	Coverage µ/128 pixel	NEFD mJy/pixel	Line Sensitivity W m-2
  LoRes HiRes	0.0230 0.0014	100 2000	2.94 0.18	25 100	4.7 × 10-17 1.2 × 10-17

  Values represent spectra taken with a 1 arcsec slit with every two pixels averaged to obtain 2 pixels/resolution element. Sensitivities are 1 in 100 seconds on-source time.

Instrument Control:

• Sun SPARCstation (UNIX/OpenWindows) + IBM Compatible PC
• IRAF Data Processing
• FITS output to disk/exabyte
• Custom control and data reduction programs