This article was accepted into the corpus but its outbound wikilinks were never NER-processed — typical at the deepest BFS hop or when the run's entity cap was reached. No expansion funnel to show.
| FITS (file format) | |
|---|---|
| Name | FITS |
| Extension | .fits, .fit, .fts |
| Owner | International Astronomical Union (IAU) |
| Released | 1981 |
| Genre | Image format, Scientific data |
FITS (file format) The Flexible Image Transport System is a digital file format widely used for storing, transporting, and archiving scientific data, especially astronomical images, spectra, and multi-dimensional datasets. It was designed to ensure long-term readability, interoperable exchange among observatories and space missions, and preservation by scientific archives such as those managed by NASA, the European Space Agency, and national observatories. The format emphasizes human-readable headers, platform independence, and extensibility for heterogeneous instruments and missions.
FITS originated from collaborations among astronomers and institutions in the late 1970s and early 1980s, influenced by individuals and organizations like the National Aeronautics and Space Administration, the European Space Agency, the Smithsonian Astrophysical Observatory, and contributors affiliated with the International Astronomical Union. Key early implementations and endorsements came from observatories such as the Palomar Observatory, the Kitt Peak National Observatory, and projects at the Jet Propulsion Laboratory. Over time, standards work involved committees and working groups in bodies such as the IAU, the International Organization for Standardization, and mission teams from the Hubble Space Telescope, the Chandra X-ray Observatory, and the Sloan Digital Sky Survey. Revisions and clarifications were shaped by technical needs highlighted by archives at institutions like the Space Telescope Science Institute, the European Southern Observatory, and national data centers.
A FITS file is organized into a sequence of Header Data Units adopted by space missions and ground facilities including the Hubble Space Telescope, the James Webb Space Telescope, and the Very Large Telescope. Each unit begins with an ASCII header comprising 80-character card images derived from practices at observatories such as Mount Wilson Observatory and instrument teams from the National Radio Astronomy Observatory and the Atacama Large Millimeter/submillimeter Array. Headers encode metadata fields used by archives at the European Space Agency, the NASA/IPAC Infrared Science Archive, and the Mikulski Archive for Space Telescopes. Data blocks follow the header and can represent images, tables, or arbitrary binary streams compatible with processing systems developed at institutions like Caltech, MIT, the Max Planck Society, and the Harvard-Smithsonian Center for Astrophysics.
FITS supports multiple data types and numeric representations standardized with input from projects like the Wilkinson Microwave Anisotropy Probe, the Planck mission, and the Kepler space telescope. Supported types include integer, floating point, and complex numbers used by instrument teams at the European Southern Observatory, the National Optical Astronomy Observatory, and the Naval Research Laboratory. Compression schemes and tile-compression conventions have been adopted and refined through software work at organizations such as the Space Telescope Science Institute, the Arizona Radio Observatory, and the Canadian Astronomy Data Centre. Algorithms and libraries contributed by groups at Johns Hopkins University, the University of Chicago, and the Carnegie Institution have enabled lossless and lossy compression tailored for missions like the Transiting Exoplanet Survey Satellite and the Wide-field Infrared Survey Explorer.
FITS metadata conventions reflect community-driven agreements involving the International Astronomical Union, the International Virtual Observatory Alliance, and archives at the European Space Astronomy Centre. Keywords and world coordinate system conventions were developed through collaborations that included the Astrometry.net project, the Sloan Digital Sky Survey consortium, and the Two Micron All Sky Survey teams. Provenance, history, and observation logs often cite mission identifiers from the Hubble Space Telescope, the Chandra X-ray Observatory, and the Spitzer Space Telescope, while calibration frameworks reference standards established by agencies like the National Institute of Standards and Technology and observatories such as Mauna Kea and La Silla.
A broad ecosystem of software supports FITS, with libraries and applications developed by entities such as the Space Telescope Science Institute, the Astropy community, the European Southern Observatory, and the National Radio Astronomy Observatory. Prominent packages include tools maintained by teams at the Smithsonian Astrophysical Observatory, the California Institute of Technology, the Max Planck Institute for Astronomy, and the University of Washington. Visualization and analysis programs used at institutions like the Harvard-Smithsonian Center for Astrophysics, the University of Toronto, and the Johns Hopkins University interoperate with archive services at the Canadian Astronomy Data Centre and the NASA/IPAC Infrared Science Archive.
FITS is ubiquitous across observational platforms and missions, employed by projects including the Hubble Space Telescope, the James Webb Space Telescope, the Chandra X-ray Observatory, the Sloan Digital Sky Survey, the Gaia mission, and ground facilities like the Atacama Large Millimeter/submillimeter Array and the Very Large Telescope. Solar physics, planetary science, and radio astronomy groups at institutions such as the National Solar Observatory, the Jet Propulsion Laboratory, and the National Radio Astronomy Observatory use FITS for imaging and spectral data exchange. Multidisciplinary use extends to fields supported by organizations like the United States Geological Survey and climate research centers that collaborate with space agencies and university consortia.
While FITS has proven durable, limitations noted by developers and archives at the International Astronomical Union, the International Virtual Observatory Alliance, and major observatories include constraints of the 80-character header card format, challenges for large-scale parallel I/O demanded by facilities like the Square Kilometre Array, and integration with modern data models advocated by groups at CERN, the European Southern Observatory, and leading universities. Future directions debated by mission teams from the European Space Agency, NASA, and community consortia involve enhanced metadata schemas, adoption of alternative serialization formats used in projects at the Large Synoptic Survey Telescope, integration with Virtual Observatory standards, and software contributions from academic centers such as Princeton University, the University of California system, and the Max Planck Society.
Category:File formats