Astrophysics (Index)About

James Webb Space Telescope

(JWST, NGST, Next Generation Space Telescope, Webb)
(future space-based 6.5 meter infrared telescope)

The James Webb Space Telescope (JWST or Webb; an early name was Next Generation Space Telescope, i.e., NGST) is a 6.5 meter (21 ft) NASA/European Space Agency/CSA space-based infrared telescope under construction, planned for launch in October 2021 (as of October 2020—the launch date has been delayed several times), to the Earth-Sun L2 Lagrangian point. Its lifetime will be limited by the fuel it carries and uses for stationkeeping (maintaining its orbit). A five-and-a-half-year program is targeted and a ten-year life is hoped for. Infrared was chosen because it is necessary for viewing very distant, redshifted astronomical objects (distant galaxies and quasars) and Earth atmosphere limits infrared observation from the ground. Infrared is also useful for observation of nearer objects as well: it is virtually always present in thermal emission. Instruments:

One observation target is spectroscopy of extra-solar planets. NIRISS can operate in a mode termed SOSS, for single-object slitless spectroscopy, aimed at differential spectroscopy for observing the light curves of transiting exoplanets. MIRI offers medium-resolution (MRS mode, offering resolutions of 1500-3500) which is hoped to provide direct imaging of exoplanets. NIRSpec offers several gratings, with grating labeled G395 offering a spectral resolution of as much as 2700. NIRCam offers WFSS (wide field slitless spectroscopy) mode. JWST also offers aperture masking interferometry (AMI). Established classes of JWST observing programs include:

Among the GTO programs is NEAT (NIRISS Exploration of the Atmospheric diversity of Transiting exoplanets).


(infrared,telescope,reflector,spacecraft,NASA,ESA,CSA,construction,L2)
Further reading:
http://en.wikipedia.org/wiki/James_Webb_Space_Telescope
http://en.wikipedia.org/wiki/NIRSpec
http://en.wikipedia.org/wiki/NIRCam
http://en.wikipedia.org/wiki/MIRI_(Mid-Infrared_Instrument)
http://en.wikipedia.org/wiki/Fine_Guidance_Sensor_and_Near_Infrared_Imager_and_Slitless_Spectrograph
https://www.jwst.nasa.gov/
https://jwst.stsci.edu/
http://sci.esa.int/jwst/
WaveLFreqPhoton
Energy
  
600nm500THz2.1eVbeginJames Webb Space Telescope
28.3μm11THz44meVendJames Webb Space Telescope

Referenced by pages:
aperture masking interferometry (AMI)
Association of Universities for Research in Astronomy (AURA)
CSA
European Space Agency (ESA)
grism
Goddard Space Flight Center (GSFC)
High Definition Space Telescope (HDST)
infrared (IR)
Korsch telescope
Lagrangian point
NASA
New Worlds Mission
Origins Space Telescope (OST)
segmented mirror
SOFIA
Space Telescope Science Institute (STScI)
three-mirror anastigmat
Ultimate Spitzer Phase Curve Survey (USPCS)

Index