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| WFPC2 | |
|---|---|
| Name | Wide Field and Planetary Camera 2 |
| Acronym | WFPC2 |
| Operator | NASA / European Space Agency |
| Launched | July 1993 |
| Decommissioned | 2009 |
| Telescope type | Imaging camera |
| Spacecraft | Hubble Space Telescope |
| Mass | 375 kg |
WFPC2 was a multispectral imaging instrument installed on the Hubble Space Telescope during the 1993 Hubble Servicing Mission to replace a failed original instrument and to introduce corrective optics. It produced transformative observations of Andromeda Galaxy, Orion Nebula, Pillars of Creation, Hubble Deep Field, and Comet Shoemaker–Levy 9, enabling work by teams associated with Space Telescope Science Institute, NASA Goddard Space Flight Center, European Space Agency, American Astronomical Society, and many university consortia.
WFPC2 served as a focal-plane camera aboard the Hubble Space Telescope after installation during the STS-61 servicing mission conducted by Space Shuttle Endeavour, providing wide-field and planetary-channel imaging to study objects such as Jupiter, Saturn, Mars, Venus, M51 (Whirlpool Galaxy), NGC 224, NGC 1976, NGC 1952 (Crab Nebula), and NGC 4038/4039 (Antennae Galaxies). The instrument supported programs from principal investigators at institutions like California Institute of Technology, Princeton University, Harvard–Smithsonian Center for Astrophysics, Johns Hopkins University, and University of Cambridge. Observing modes and pipelines interacted with archives at Mikulski Archive for Space Telescopes, data analysis groups at Space Telescope Science Institute, and calibration teams at Ball Aerospace and Lockheed Martin.
The optical design combined a set of four charge-coupled device arrays arranged in an L-shaped geometry, sharing heritage with instruments developed by Westinghouse, PerkinElmer, and RCA. Mechanical and thermal systems were integrated with HST interfaces designed by Lockheed Missiles and Space Company under management from NASA Goddard Space Flight Center and coordination with Marshall Space Flight Center. WFPC2 incorporated a corrective optical element devised in response to the Hubble aberration discovered after HST launch, following directions from panels led by figures from National Academy of Sciences and recommendations by the Independent Optical Review Committee.
WFPC2 used four 800×800 pixel charge-coupled devices with distinct plate scales for the wide-field and planetary channels, produced with manufacturing inputs from Goddard Space Flight Center and contractors such as Eastman Kodak Company. The filter complement included broadband and narrowband filters—named and characterized in coordination with astronomers at Carnegie Institution for Science, Max Planck Institute for Astronomy, Kitt Peak National Observatory, Mount Wilson Observatory, and Palomar Observatory—enabling targeted imaging of emission lines like Hα in Messier 42 and [O III] in NGC 6543 (Cat's Eye Nebula). Detector behavior (charge transfer efficiency, dark current, hot pixels) was monitored by teams at Space Telescope Science Institute, University of California, Berkeley, and Massachusetts Institute of Technology across campaigns including calibration programs led from Ball Aerospace.
Calibration efforts for WFPC2 involved flat-fielding, bias subtraction, cosmic-ray rejection, and geometric distortion correction using algorithms developed by groups at Space Telescope Science Institute, European Southern Observatory, National Optical Astronomy Observatory, and Johns Hopkins University. Pipeline software such as those maintained by STScI interfaced with community tools from SExtractor-using teams at Institut d'Astrophysique de Paris and photometric calibration programs tied to standards from Cerro Tololo Inter-American Observatory and Landolt standard star catalogs. Long-term monitoring addressed charge transfer inefficiency documented in studies led by researchers at University of Arizona and University College London.
WFPC2 enabled landmark results across stellar, galactic, and extragalactic astronomy: resolved stellar populations in Andromeda Galaxy and Large Magellanic Cloud, star formation structures in Orion Nebula and Pillars of Creation in Eagle Nebula, supernova progenitor studies including SN 1987A follow-ups and Supernova 1993J imaging, and deep-field surveys such as the Hubble Deep Field leading to constraints on galaxy formation models advanced by teams at Carnegie Mellon University, Yale University, University of Chicago, and University of California, Santa Cruz. Cosmological implications from WFPC2 data fed into work by researchers associated with Institute for Advanced Study, Princeton University, Harvard University, and Max Planck Society, influencing studies of star cluster evolution in 47 Tucanae, mass distribution in M87, and gravitational lensing analyses of systems like Einstein Cross.
Installed during the 1993 Hubble Servicing Mission by STS-61 astronauts, WFPC2 operated continuously through multiple scheduling cycles managed by Space Telescope Science Institute and was serviced in subsequent missions by teams from NASA and European Space Agency. Its operations spanned instrument performance monitoring, annealing cycles coordinated with engineers at Goddard Space Flight Center and data calibration updates published by STScI staff. As HST scheduling plans evolved with programs from Hubble Treasury Program and archive initiatives like the Hubble Legacy Archive, WFPC2 remained a workhorse instrument until replacement planning accelerated.
WFPC2’s scientific legacy influenced instrument design at institutions including Ball Aerospace, Jet Propulsion Laboratory, and the European Space Agency for later cameras such as Advanced Camera for Surveys, Wide Field Camera 3, and next-generation imagers on projects connected to James Webb Space Telescope teams. Its datasets continue to be used by researchers at Mikulski Archive for Space Telescopes, Sloan Digital Sky Survey collaborators, and university groups worldwide, informing archival reprocessing efforts by Space Telescope Science Institute and methodological studies from Harvard–Smithsonian Center for Astrophysics. Category:Space telescopes