Fine Guidance Sensor and Near Infrared Imager and Slitless Spectrograph

FGS Test unit undergoes cryogenic testing, 2012

Fine Guidance Sensor and Near Infrared Imager and Slitless Spectrograph (FGS-NIRISS) is an instrument for the planned James Webb Space Telescope that combines a Fine Guidance Sensor and a science instrument, a near-infrared imager and a spectrograph.[1] The FGS/NIRISS is being built by the Canadian Space Agency as part of the international project to build a large infrared space telescope with the United States and various European states.[1] FGS-NIRISS observers light from the wavelengths of 0.8 to 5.0 microns.[1] The instrument has four different observing modes.[2] Physically the FGS and NIRISS are combined, but optically they are separate with the FGS being used by the telescope to point it, whereas NIRISS is an independent science instrument.[2][3] The spectroscopic mode is capable of doing exoplanet spectroscopy.[4] The detector for NIRISS is a 2048 x 2048 pixel HgCdTe array, where aach pixel is 18 microns on a side according to the STSCi.[5] The field of view is 2.2' x 2.2' which gives a plate scale of about 0.065 arcsec/pixel.[5]

The FGS helps the telescope aim and stay pointed at whatever it is commanded to look at.[6] FGS helps provide data to the JWST Attitude Control System (ACS) and do this it is a big sky coverage and sensitivity, to give a high probability it can find a guide star.[7]

Related institutions and the science team for the instrument includes:[6]

References

  1. 1 2 3 "The James Webb Space Telescope". jwst.nasa.gov. Retrieved 2016-11-27.
  2. 1 2
  3. ↑ Webb's Instruments
  4. ↑ "ESA Science & Technology: The JWST instrument suite". sci.esa.int. Retrieved 2016-11-27.
  5. 1 2 "NIRISS: Near-InfraRed Imager and Slitless Spectrograph". stsci.edu. Retrieved 2016-11-27.
  6. 1 2 "Canada's Contribution to the James Webb Space Telescope - Canadian Space Agency". asc-csa.gc.ca. Retrieved 2016-11-27.
  7. ↑ "FGS - Fine Guidance Sensor". stsci.edu. Retrieved 2016-11-27.

See also

External links

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