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FITS Standard Document

The official reference document that defines the requirements for FITS format data files.


Current version 3.0 (July 2008):
Published version:     in Astronomy and Astrophysics, Volume 524 (December 2010)

Latest PDF document maintained by the IAU FITS Working Group (November 2010)

Other related documents:


Version 2.1b (December 2005):    PDF format,    Postscript format

Main changes in version 2.1b compared to the previous NOST 100-2.0 version are:

Other related documents:


Version NOST 100-2.0 (March 1999):    PDF format,    Postscript format

Latex source files: fits_standard20.tex, nost.sty, ieee1.eps, ieee2.eps, fits_standard20.ind

This version of the Standard was published in the Astronomy & Astrophysics scientific journal in September 2001. This published version was endorsed by the IAU FITS Working Group in October 2000 and is identical to the original NOST document except for the addition of 2 introductory sections on the history of FITS and on the process that lead to the creation of the NOST document. There were also 2 minor clarifications on a) the interpretation of the word "deprecated" and b) the usage of the TDIMn keyword with variable length array columns.


Version NOST 100-1.2 (April 1998):    PDF format,    Postscript format

This version adds the Image and Binary Table standard extensions. List of changes between v1.1 and v1.2.

Latex source files: fits_standard.tex, nost.sty, ieee1.eps, ieee2.eps, fits_standard.ind


Version NOST 100-1.1 (September 29 1995):    Postscript format,    latex source


Version NOST 100-1.0 (June 1993):    PDF format,    Postscript format,    NOST announcement



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