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The Wide Field Camera 3 (WFC3) is the
Hubble Space Telescope The Hubble Space Telescope (often referred to as HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the first space telescope, but it is one of the largest and most ver ...
's last and most technologically advanced instrument to take images in the visible spectrum. It was installed as a replacement for the Wide Field and Planetary Camera 2 during the first spacewalk of Space Shuttle mission
STS-125 STS-125, or HST-SM4 (Hubble Space Telescope Servicing Mission 4), was the fifth and final Space Shuttle mission to the Hubble Space Telescope (HST) and the last solo flight of the Space Shuttle ''Atlantis''. The launch of the Space Shuttle ''Atl ...
(Hubble Space Telescope Servicing Mission 4) on May 14, 2009. WFC3 was still operating.


Specifications

The instrument is designed to be a versatile
camera A camera is an optical instrument that can capture an image. Most cameras can capture 2D images, with some more advanced models being able to capture 3D images. At a basic level, most cameras consist of sealed boxes (the camera body), with a ...
capable of imaging astronomical targets over a very wide wavelength range and with a large field of view. It is a fourth-generation instrument for Hubble. The instrument has two independent light paths: a UV and optical channel that uses a pair of
charge-coupled device A charge-coupled device (CCD) is an integrated circuit containing an array of linked, or coupled, capacitors. Under the control of an external circuit, each capacitor can transfer its electric charge to a neighboring capacitor. CCD sensors are ...
s (CCD) to record images from 200 to 1000  nm; and a near infrared detector array that covers the wavelength range from 800 to 1700 nm. The UV/optical channel has two CCDs, each 2048×4096
pixel In digital imaging, a pixel (abbreviated px), pel, or picture element is the smallest addressable element in a raster image, or the smallest point in an all points addressable display device. In most digital display devices, pixels are the s ...
s, while the IR detector is 1024×1024. The focal planes of both channels were designed specifically for this camera. The optical channel has a field of view of 164 by 164 arcsec (2.7 by 2.7 arcminute, about 8.5% of the diameter of the full moon as seen from Earth) with 0.04 arcsec pixels. This view is comparable to the Wide Field and Planetary Camera 2 and is slightly smaller than that of the Advanced Camera for Surveys. The near infrared channel has a field of view of 135 by 127 arcsec (2.3 by 2.1 arcminutes) with 0.13 arcsec pixels, and has a much larger field of view than Near Infrared Camera and Multi-Object Spectrometer, which it was designed to largely replace. The near infrared channel is a pathfinder for the future
James Webb Space Telescope The James Webb Space Telescope (JWST) is a space telescope which conducts infrared astronomy. As the largest optical telescope in space, its high resolution and sensitivity allow it to view objects too old, distant, or faint for the Hubble ...
. Both channels have a variety of broad and narrow-band filters, as well as prisms and grisms, which enable wide-field, very-low-resolution spectroscopy that is useful for surveys. The optical channel covers the visible spectrum (380 nm to 780 nm) with high efficiency, and is also able to see into the near ultraviolet (down to 200 nm). The IR channel is designed to lack sensitivity beyond 1700 nm (as compared with the 2500 nm limit for NICMOS) to avoid being swamped by thermal background coming from the relatively warm HST structure. This allows WFC3 to be cooled using a
thermoelectric cooler Thermoelectric cooling uses the Peltier effect to create a heat flux at the junction of two different types of materials. A Peltier cooler, heater, or thermoelectric heat pump is a solid-state active heat pump which transfers heat from one side o ...
instead of carrying a consumable cryogen to cool the instrument. The camera makes use of returned space hardware as the structure is built from the original Wide Field and Planetary Camera as well as the filter assembly. These were switched for the Wide Field and Planetary Camera 2 by the servicing mission STS-61 in December 1993. WFC3 was originally conceived as an optical channel only; the near infrared channel was added later. WFC3 is intended to ensure that
Hubble The Hubble Space Telescope (often referred to as HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the first space telescope, but it is one of the largest and most versa ...
retains a powerful imaging capability through to the end of its lifetime.


History

WFC3 had been in the planning since the Spring of 1998. It was built by a team of highly experienced Hubble engineers and scientists drawn from many organizations, with leadership at
Goddard Space Flight Center The Goddard Space Flight Center (GSFC) is a major NASA space research laboratory located approximately northeast of Washington, D.C. in Greenbelt, Maryland, United States. Established on May 1, 1959 as NASA's first space flight center, GSFC emp ...
in
Maryland Maryland ( ) is a U.S. state, state in the Mid-Atlantic (United States), Mid-Atlantic region of the United States. It shares borders with Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; ...
. WFC3 was constructed mostly at Goddard Space Flight Center and Ball Aerospace in Colorado. Various parts were built by contractors across the United States and the United Kingdom. The instrument was scheduled by
NASA The National Aeronautics and Space Administration (NASA ) is an independent agency of the US federal government responsible for the civil space program, aeronautics research, and space research. NASA was established in 1958, succeedi ...
to launch with
STS-125 STS-125, or HST-SM4 (Hubble Space Telescope Servicing Mission 4), was the fifth and final Space Shuttle mission to the Hubble Space Telescope (HST) and the last solo flight of the Space Shuttle ''Atlantis''. The launch of the Space Shuttle ''Atl ...
on 14 October 2008, but the mission was postponed due to additional repairs that were required. The mission launched on 11 May 2009 and the WFC3 was installed on 14 May. by astronauts
John M. Grunsfeld John Mace Grunsfeld (born 10 October 1958) is an American physicist and a former NASA astronaut. He is a veteran of five Space Shuttle flights and has served as NASA Chief Scientist. His academic background includes research in high energy astr ...
and Andrew J. Feustel.


WFC3 Pillars of Creation

In celebration of the 25th anniversary since the launch of the Hubble Space Telescope, astronomers assembled a larger and higher-resolution photograph of the Pillars of Creation, which was unveiled in January 2015 at the American Astronomical Society meeting in Seattle. The image was photographed by the Hubble Telescope's Wide Field Camera 3, installed in 2009, and produced using near-infrared and visible light exposure. The 1995 version of this picture of part of the Eagle nebula was taken with WFPC2.


2015 onwards

On January 8, 2019, the instrument experienced a suspected hardware problem and the onboard computer suspended operations with the WFC3 while other instruments continued operation. NASA later stated that the issue was software related and brought the instrument to normal status on January 17, 2019.


Gallery

File:HH 901 and HH 902 in the Carina nebula (captured by the Hubble Space Telescope).jpg, WFC3 view of Mystic Mountain in the
Carina Nebula The Carina Nebula or Eta Carinae Nebula (catalogued as NGC 3372; also known as the Great Carina Nebula) is a large, complex area of bright and dark nebulosity in the constellation Carina, located in the Carina–Sagittarius Arm of the Milky Wa ...
File:Pillars of creation 2014 HST WFC3-UVIS full-res denoised.jpg, A higher-resolution HST image of the Pillars of Creation in the Eagle Nebula, taken in 2014 as a tribute to the original photograph File:Jupiter on 2010-06-07 (captured by the Hubble Space Telescope).jpg, Jupiter in 2010, by WFC3


See also

HST instruments : * Wide Field and Planetary Camera * Wide Field and Planetary Camera 2 * Advanced Camera for Surveys * Cosmic Origins Spectrograph * Faint Object Camera * Faint Object Spectrograph *
Goddard High Resolution Spectrograph The Goddard High Resolution Spectrograph (GHRS or HRS) was an ultraviolet spectrograph installed on the Hubble Space Telescope during its original construction, and it was launched into space as part of that space telescope aboard the Space Shutt ...
* Near Infrared Camera and Multi-Object Spectrometer * Space Telescope Imaging Spectrograph Other space telescopes and their instruments : * Spitzer Space Telescope (Great Observatory for infrared, launched 2003) ** Infrared Array Camera (Spitzer near to mid infrared camera) * NIRCam (Near IR camera under 5 micron light for JWST)


References


External links

* Th
WFC3 Web site
at th
Space Telescope Science Institute
which includes a description of the instrument and a link that compares the capabilities of various Hubble instruments.




NASA.gov WF3
{{Hubble Space Telescope Hubble Space Telescope instruments Space imagers