JWST Fast Facts and WMAP facts.

JWST Fast Facts

The James Webb Space Telescope (JWST) is an orbiting infrared observatory that will take the place of the Hubble Space Telescope at the end of this decade. It will study the Universe at the important but previously unobserved epoch of galaxy formation. It will peer through dust to witness the birth of stars and planetary systems similar to our own. And using JWST, scientists hope to get a better understanding of the intriguing dark matter problem. The JWST is also a key element in NASA's Origins Program .

* Proposed Launch Date: no earlier than June 2013
* Proposed Launch Vehicle: Ariane 5
* Mission Duration: 5 - 10 years
* Total payload mass: Approx 6200 kg, including observatory, on-orbit consumables and launch vehicle adaptor.
* Diameter of primary Mirror: ~6.5 m (21.3 ft)
* Clear aperture of primary Mirror: 25 m 2
* Primary mirror material: beryllium
* Mass of primary mirror: about one-third as much as Hubble's
* Focal length: TBD
* Number of primary mirror segments: 18
* Optical resolution: ~0.1 arc-seconds
* Wavelength coverage: 0.6 - 28 microns
* Size of sun shield: ~22 m x 10 m (72 ft x 33 ft)
* Orbit: 1.5 million km from Earth at L2 Point
* Operating Temperature: under 50 K (-370 deg;F)


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For wmap, its temperature is below < 95 K.

http://map.gsfc.nasa.gov/m_mm/ob_techsummary.html#PageTop


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Black boday peak wavelength

lamda = 2898 / T (micron).

So for T=50 K, peak wavelength is around 60 micron which is out of the obvering band 0.6-28 micron.