Quick Facts About Webb
PRIMARY MIRROR STATS
Mirror Type: Segmented parabolic reflector
Width: 21.6 feet (6.5 m) at its widest point
Area: 269 square feet (25 m2)
Mass: 1554 lbs (705 kg)
Focal Length: 414.4 feet (131.4 m)
Optical Resolution: 0.07 arc-seconds, diffraction-limited at 2-micrometer wavelengths (0.0317 arc-second pixels)
Material: Beryllium, with a thin coating of gold
Number of Segments: 18Back to top
Operating Temperature: –387.7 Fahrenheit (40 Kelvin; –233.2 Celsius)
Observatory Mass: About 14,000 lbs (6,330 kg)
Sunshield Size: 70 by 48 feet (21.2 by 14.6 m)
Planned Launch: 2018
Launch Vehicle: Ariane 5 rocket, provided by the European Space Agency
Launch Site: The Centre Spatial Guyanais (CSG) in Kourou, French Guiana
Location: Orbiting the Sun 940,000 miles (1.5 million km) from Earth at the Second Lagrange Point (L2)
Orbit Shape: As seen from Earth at midnight, the Webb orbit completes a large loop of 1,000,000 km in diameter, twice a year.
Transit Time to Orbit: About 1 month
Science Mission Lifetime: 5 years, with a goal of 10 years
Solar Array Power: 2000 watts
Maximum Data Rate (Deep Space Network): 28 Mbps
Cost at Launch: $8 billion, plus ESA and CSA contributionsBack to top
Wavelength Coverage: 0.6- 28.5 micrometers
- Near Infrared Camera (NIRCam) (0.6–5 micrometers)
- Near Infrared Spectograph (NIRSpec) (0.7–5 micrometers)
- Mid Infrared Instrument (MIRI) (5–28.5 micrometers)
- Fine Guidance Sensors/Near-Infrared Imager and Slitless Spectrograph (FGS/NIRISS) (0.6–5 micrometers)
Webb's sunshield is the size of a tennis court.
Webb's mirror is covered in a thin layer of gold.
While Webb can't observe Mercury or Venus, it will be able to study the solar system beyond the orbit of Mars, including Mars, the outer planets, icy moons, and Kuiper Belt Objects.
Excepting rare glints from the Sun, the Webb will appear as a very faint star in the night sky when seen from the Earth, more than 10,000 times fainter than the faintest star seen by the naked eye.