- O/IR System
GMOS (Gemini Multi-Object Spectrographs) North and South are the medium-resolution optical spectrographs at Gemini. Long-slit, multi-object, and integral field unit spectroscopy modes are offered, as well as imaging with narrow/broad band filters. The Gemini GMOS page provides a comprehensive overview including references to the design. The North and South detectors consist of three 2k x 4k pixel CCDs each. The plate scale is roughly 0.08 arcsecond per pixel. Additional information on GMOS can be found in the GMOS Cookbook.
Planning observations for GMOS can be challenging because of the large number of available instrument configurations and observing modes. Try our new GMOS Observation Planning Guide. This document contains guides to instrument configuration and baseline calibrations, as well as Phase 1 and Phase 2 checklists.
Some questions and their solutions can be found on the FAQ page. Many of these are helpdesk questions that have been previously submitted and answered.
Last updated or reviewed September 28, 2020.