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Extensible Image Serialization Format (XISF) is an image file format created by PixInsight. It is a free format open to contributions of anyone interested. For more detailed information about the format itself refer to

N.I.N.A. is capable of saving images in XISF format. The XISF format offers a variety of header meta information and N.I.N.A. will populate all available information into this header. A detailed list of all available Headers and their conditions is described below. Many applications can make use of these headers (e.g. PixInsight during processing).

Standard XISF Headers#

  • Version: 1.0
  • CreationTime: Time when the file is created
  • CreatorApplication: N.I.N.A. - Nighttime Imaging 'N' Astronomy

Observation Namespace#


  • Start: UTC time at exposure start


  • Elevation: Elevation (currently taken from a connected telescope)
  • Latitude: Latitude taken from the astrometry settings
  • Longitude: Longitude taken from the astrometry settings


Requires a telescope to be connected

  • RA: Current telescope's right ascension coordinates
  • Dec: Current telescope's declination coordinates


Available when a target is set inside a sequence.

  • Name: Name of object
  • RA: Right ascension of target
  • Dec: Declination of target


Requires a weather data source to be connected

  • RelativeHumidity: Relative humidity percentage
  • AtmosphericPressure: Air pressure in hPa
  • AmbientTemperature: Ambient air temperature in Celsius
  • WindDirection: Wind direction: 0=N, 180=S, 90=E, 270=W
  • WindGust: Wind gust in kph
  • WindSpeed: Wind speed in kph

Instrument Namespace#

  • ExposureTime: Expsure duration in seconds


Requires a camera to be connected

  • Name: Name of camera
  • Gain: Electrons per A/D unit (only available for some cameras)
  • XBinning: X binning factor
  • YBinning: Y binning factor


Requires a camera to be connected

  • Temperature: actual sensor temperature (requires a cooling unit)
  • XPixelSize: Pixelsize
  • YPixelSize: Pixelsize


Requires a telescope to be connected

  • Name: Name of telescope
  • FocalLength: Focal length (taken from equipment options)
  • Aperture: Focal length / Focal ratio (taken from equipment options)


Requires a filterwheel to be connected

  • Name: Current active filter


Requires a focuser to be connected

  • Position: Current step position


Additionally all information that is explained in the FITS description is stored using the FITSKeyword Core Element.