Change page style: 

GMOS-North Fringing

The GMOS-N E2V DD CCDs, used between Nov 2011 and Feb 2017, had much weaker fringing than the original GMOS-N EEV CCDs or the new Hamamatsu CCDs. This page shows examples of fringe frames in imaging mode.

Spectroscopy Overview

Three types of spectroscopy are possible with each GMOS and its selection of gratings.




The GMOS-N and GMOS-S EEV detectors had significant fringing in the red. The GMOS-N DD E2V detectors, which were in operation until February 2017, and the new GMOS-N and GMOS-S Hamamatsu detectors exhibit much less fringing than the original EEV detectors. The pages in this section show examples of fringe frames in imaging mode as well as science data before and after correction for fringing.


  • GMOS-North
  • GMOS-South
  • GeminiFocus and Archives

    Please email us to sign up for notification of electronic GeminiFocus publication.

    Click on the cover below to access the e-reader version (Flash Player required for desktop browsers)

    Detector Array

    Detector characteristics are given in this section. Note that the GMOS-South and GMOS-North detectors have been upgraded to Hamamatsu CCDs in 14B and 17A, respectively. Note also that the telescope optics are currently silver-coated, reducing the system throughput in the blue.

    Revolucionaria Cámara del Observatorio Gemini promete una nueva era de descubrimientos

    Banco óptico de infrarrojo cercano de OCTOCAM. La sección del infrarrojo cercano es enfriada criogénicamente en vacío para operar a una temperatura por debajo de 80 grados Kelvin.

    OCTOCAM Looks Toward a New Era of Discovery

    OCTOCAM's near-infrared optical bench. The near-infrared section is cryogenically cooled in a vacuum to operate at a temperature below 80 Kelvin.

    Planetoid Pairs Reveal a Kinder, Gentler Neptune

    Artist’s conception of a loosely tethered binary planetoid pair like those studied by Fraser et al. in this work which led to the conclusion that Neptune’s shepherding of them to the Kuiper Belt as gradual and gentle in nature. Credit: Gemini Observatory/AURA, artwork by Joy Pollard.

    Patched 17A OT available for non-sidereal observations

    The Gemini Observing Tool version 2017A.1.1.5 is now available for download. This version fixes non-sidereal target queries to the JPL Horizons service.

    Installation instructions are linked off of the Observing Tool web page