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NIRI (Near InfraRed Imager and spectrograph) - Gemini North
Capability: 1-5 micron wavelength seeing-limited, Natural Guide Star (NGS) Adaptive Optics (AO), or Laser Guide Star (LGS) AO imaging
NIRI is only available for queue, priority visitor, and classical imaging observations due to problems with the focal plane mask and beam splitter mechanisms. The NIRI spectroscopy pages are provided for archival data reduction.
NIRI was built by the University of Hawaii's Institute for Astronomy. It has three cameras: f/32, f/14, and f/6. In imaging mode they provide plate scales of 0.022, 0.050, and 0.117 arcsec pixels, respectively and fields of view of 22x22, 51x51, and 120x120 arcseconds squared, respectively. A large number of broad- and narrow band filters are available. Imaging with all cameras and all filters is possible, with the exceptions of the L' band at f/6 and the M band at f/6 and f/14, where the background saturates the array in the minimum exposure time.
The Gemini facility adaptive optics (AO) system, ALTAIR, is available for use with NIRI at f/14 or f/32, either with a natural guide star or the laser guide star, for all imaging except in the M band (the advantage of AO at L' is modest and is only for point sources).
Also see the Near-IR Resources section, which contains generic information about observing at 1-5um as well as details about calibrations, standard stars, etc.
Gemini Instrument Scientist: Meg Schwamb
NIRI instrument team contact: niri_science 'at' gemini.edu
Science Paper Acknowledgements
All science papers that include NIRI data published in refereed science journals should include the standard Gemini acknowledgement. We also recommend that you reference the following paper to describe NIRI: "The Gemini Near-Infrared Imager" by Hodapp et al., 2003, PASP, 115, 1388.
NIRI Science Highlights
- Volcanoes on Io: Long-term Tracking with Adaptive Optics
- Gemini Observatory Instrumental in Exoplanet Harvest
- Lens modeling with Maunakea Observatories leads to an independant high precision measurement of the Hubble constant
- Charon: An Ice Machine in the Ultimate Deep Freeze