Primary Instrument Master:
Secondary Instrument Master:
|Follow this link for information about pre-observing activities: proposal preparation, mask design and submission, pre-run activities, etc.
||Follow this link for information about your observing run: instrument and telescope setups, scripts, software, procedures, etc.
||Follow this link for information about
your post-observing activities: backups, comment forms, data
|Trouble Shooting pages and links.
||Portal to the technical pages: for the initiated only!
||A listing of the instrument pages.
The Echellette Spectrograph and Imager (ESI) is a
visible-wavelength, faint-object, imager and single-slit
spectrograph in operation at the Cassegrain focus of the
Keck II telescope since 1999. ESI was designed and built
at UCO/Lick Observatory under the leadership of Principal
Investigator J. S. Miller and Project Manager Dave Cowley.
of ESI include:
- Cross-dispersed spectroscopy mode along a 20 arcsec
slit at a FWHM resolving power of up to R=13,000
- Low-dispersion spectroscopy mode along an 8 arcmin
slit providing resolving power of 1000<R<6000
- Direct imaging capability across a 2×8 arcmin field
- Wide spectral range provides complete coverage from 0.39 to
1.1µm in a single exposure
- Open-loop flexure compensation system maintains image
stability of ±0.25 px over full rotation
- High throughput
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