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 vers ...

'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

Hubble Sees a Horsehead of a Different Color

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 a ...

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, 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 Advanced Camera for Surveys (ACS) is a third-generation axial instrument aboard the Hubble Space Telescope (HST). The initial design and scientific capabilities of ACS were defined by a team based at Johns Hopkins University. ACS was assembl ...

. 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. 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 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 The Wide Field/Planetary Camera (WFPC) (pronounced as wiffpick (Operators of the WFPC1 were known as "whiff-pickers")) was a camera installed on the Hubble Space Telescope launched in April 1990 and operated until December 1993. It was one of ...

as well as the filter assembly. These were switched for the Wide Field and Planetary Camera 2 by the servicing mission

STS-61 STS-61 was the first NASA Hubble Space Telescope servicing mission, and the fifth flight of the Space Shuttle ''Endeavour''. The mission launched on 2 December 1993 from Kennedy Space Center (KSC) in Florida. The mission restored the spacebor ...

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 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 in

Maryland Maryland ( ) is a state in the 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; and Delaware and the Atlantic Ocean to ...

. 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 agencies of the United States government, independent agency of the US federal government responsible for the civil List of government space agencies, space program ...

to launch with

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 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 ''Mystic Mountain'' is a photograph and a term for a region in the Carina Nebula imaged by the Hubble Space Telescope. The view was captured by the then-new Wide Field Camera 3, though the region was also viewed by the previous generation inst ...

in the Carina Nebula 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

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