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| Wide Field Camera 2 | |
|---|---|
| Name | Wide Field Camera 2 |
| Other names | WFPC2 |
| Operator | National Aeronautics and Space Administration (NASA) |
| Manufacturer | Ball Aerospace; Jet Propulsion Laboratory |
| Mission | Hubble Space Telescope |
| Launched | 1993 |
| Deactivated | 2009 |
| Wavelength | Ultraviolet, visible, near-infrared |
Wide Field Camera 2 Wide Field Camera 2 was a second-generation imaging instrument installed on the Hubble Space Telescope in 1993 to replace the original camera after the STS-61 servicing mission. Designed to improve imaging in the ultraviolet and visible bands, it served alongside instruments such as the Space Telescope Imaging Spectrograph and later the Advanced Camera for Surveys until its removal during STS-125. The instrument enabled high-resolution studies that influenced programs at the European Space Agency, Smithsonian Institution, and numerous university observatories.
The design incorporated a four-chip mosaic to provide a wide field of view while delivering near-diffraction-limited imaging for studies comparable to those undertaken by Keck Observatory, Palomar Observatory, Very Large Telescope, and Subaru Telescope. Optical elements were optimized for compatibility with the Hubble Space Telescope optics, the Corrective Optics Space Telescope Axial Replacement program, and lessons from the Wide Field and Planetary Camera heritage. Mechanical design drew on experience from contractors including Ball Aerospace and the Jet Propulsion Laboratory, balancing thermal control against structural requirements similar to considerations faced by the Chandra X-ray Observatory and James Webb Space Telescope teams. The instrument supported an array of filters and a shutter mechanism developed in coordination with Marshall Space Flight Center and Goddard Space Flight Center engineering groups.
WFPC2 employed four charge-coupled device detectors arranged in a chevron to produce a composite field, an architecture informed by CCD developments used at Mount Wilson Observatory, European Southern Observatory, and in missions like Galaxy Evolution Explorer. The CCDs were thinned, backside-illuminated devices with anti-reflective coatings akin to those used by the Sloan Digital Sky Survey and matched to filter sets analogous to photometric systems used by the Two Micron All Sky Survey and Pan-STARRS. Instrument electronics interfaced with NASA telemetry standards, command and data handling derived from Space Shuttle-era avionics, and calibration lamps similar to systems aboard the International Ultraviolet Explorer.
Installed during the STS-61 servicing mission in December 1993, the camera began routine science operations coordinated by the Space Telescope Science Institute and supported by teams at Goddard Space Flight Center. WFPC2 operated through numerous observation cycles that included programs led by principal investigators based at institutions such as Harvard University, California Institute of Technology, University of California, Berkeley, and Max Planck Society institutes. The instrument experienced degradation from proton radiation in low Earth orbit, prompting periodic annealing procedures and operational adjustments documented alongside servicing efforts like STS-109 and STS-125. WFPC2 was removed during the final servicing mission, STS-125, in May 2009.
WFPC2 produced a trove of images that directly contributed to landmark results associated with teams at Princeton University, University of Chicago, Space Telescope Science Institute, and international consortia including European Southern Observatory partners. Its data underpinned measurements of the Hubble constant that complemented work by teams using the Hubble Space Telescope Key Project and later refinements by groups at Carnegie Institution for Science and Johns Hopkins University. The camera captured high-resolution observations of targets such as NGC 4038 (the Antennae Galaxies), NGC 1300, and star-forming regions comparable to studies by Spitzer Space Telescope and Chandra X-ray Observatory. WFPC2 imaging contributed to research on Type Ia supernovae progenitors pursued by collaborators at Space Telescope Science Institute and Harvard-Smithsonian Center for Astrophysics, supported morphological classification work related to catalogs assembled by the Sloan Digital Sky Survey teams, and informed stellar population analyses by researchers at Max Planck Society institutes and University of Cambridge groups.
Calibration of WFPC2 exploited on-board lamps and ground-based standards coordinated with calibration programs at Space Telescope Science Institute and the National Optical Astronomy Observatory. Data processing pipelines evolved to remove instrumental signatures such as charge transfer inefficiency and flat-field variations, leveraging algorithms and software developed in collaboration with teams at STScI, European Space Agency, and academic groups from University of California, Santa Cruz and University of Arizona. Calibrated products were archived in the Mikulski Archive for Space Telescopes and used in cross-instrument analyses with datasets from Advanced Camera for Surveys, Near Infrared Camera and Multi-Object Spectrometer, and external surveys like Two Micron All Sky Survey and Hubble Deep Field follow-ups.
Following its removal during STS-125, WFPC2 was returned to Earth and retired, while its scientific legacy persisted through archival data widely cited by institutions including NASA, European Space Agency, Space Telescope Science Institute, and universities worldwide. The instrument's extensive image archive influenced the design and calibration strategies of successor instruments such as the Wide Field Camera 3 and served as a benchmark for imaging performance compared with facilities like James Webb Space Telescope and ground-based adaptive optics systems at Keck Observatory and Very Large Telescope. WFPC2 outputs remain integral to long-term studies at research centers including Carnegie Institution for Science, Harvard University, and Max Planck Society, and the instrument is featured in museum and outreach collections curated by entities such as the Smithsonian Institution.
Category:Space telescope instruments