Keck Instruments

Keck Instrumentation

An overview, and links to documentation for the current Keck instrumentation can be found at the Keck Instruments and Facilities page.

Keck I

  • HIRES is a high-resolution optical spectrograph (R = 25K-85K). HIRES uses different cross-dispersers and collimators, which are optimised for either short or long wavelength observations. Switching between the two setups is not possible during the night.
  • LRIS is an optical imager and longslit/multi-object spectrometer (R = 300-5000) with a field of view of 6' x 7.8'. A spectropolarimetry mode is also available.
  • MOSFIRE is a near-infrared multi-object spectrograph (R~3500) with a 6.1' x 6.1' field of view. Up to 46 slits in a cryogenic environment can be reconfigured electronically within a few minutes.
  • OSIRIS is a near-infrared integral field spectrograph (R~3800) with various pixel scales and fields of view (up to 4.8" x 6.4"), designed for use with the Keck Adaptive Optics system.

Keck II

  • DEIMOS is a is an optical imager and longslit/multi-object spectrometer. DEIMOS offers a larger imaging field (16.7' x 5.0') and longer slit than LRIS, has active flexure compensation, and can offer slightly more slit-masks than LRIS.
  • ESI is an optical faint object imager (8' x 2') and longslit spectrograph offering a range of resolution (up to R=13K) with complete spectral coverage.
  • NIRC2 is a near-infrared imager (up to 40" x 40") and spectrograph, designed for use with the Keck Adaptive Optics system. A number of occulting spots for coronagraphy are available.
  • NIRSPEC is a near-infrared high resolution spectrograph (R up to 25K) which can be used with or without the Keck Adaptive Optics system.
  • KCWI is a new integral field spectrograph with a seeing-limited field of view up to 20" x 33". Initially only the blue channel covering 350-560 nm at spectral resolutions between 1,000 and 20,000 with a Nod-and-Shuffle option is available.
  • NIRES is a new near-infrared echellette spectrograph covering 0.94 to 2.45 microns simultaneously at a resolution ~2700, available for shared-risks use from Feb 2018.

Adaptive Optics

Adaptive Optics with either natural guide stars (NGS) or a laser guide star (LGS) is available for science with OSIRIS on Keck I, and with NIRC2 and NIRSPEC on Keck II.

Due to the fact the LGS systems cannot be used if even light cirrus is present, or whenever US Space Command refuses clearance for laser propagation, backup programs for LGS proposals are essential. These may be either NGS programs or non-AO (seeing limited) NIRSPEC on Keck II, or NGS programs or HIRES on Keck I.