Background

DEIMOS Quick Facts

• DEIMOS is a low-to-moderate resolution optical spectrograph and imager capable of working through most of the optical.
• It is a mounted at the Nasmyth focus of Keck II. The whole instrument rotates to keep a fixed orientation (PA mode) on sky.
• DEIMOS is mainly used with large slitmasks for multi-object spectroscopy but it can also perform single object long-slit spectroscopy and be used as an imager.
• DEIMOS is most notable for the very large field of view it offers which means a very large number of objects can be observed simultaneously.

Common Nighttime Problems

• Resetting the rotator controller
• Resetting DEIMOS instrument air pressure
• Resetting the DEIMOS Lantronix
• Resetting DEIMOS AC power
• Fixing a jammed or cross-threaded slitmask

See Also

• DEIMOS Notes for Observing Assistants