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Light-curve Metadata

The keywords listed below are required or suggested for all FITS files that contain light curves. Since at present light curves are only supported in tabluar format, all keywords must appear in the extension (E) header. Recommended keywords, if absent, will be computed and inserted prior to ingest; suggested keywords would be beneficial to archival users if present. Headers must also include the basic structural FITS keywords and the list of common keywords.

Keyword HDU Notes
Required Keywords
BUNIT E Brightness unit for array values
DEC_TARG E Declination coordinate of the target or field, in degrees
FILTER E Name of filter used, or 'MULTI' if more than one defined the passband.
FILTERnn E Name(s) of filter(s) used to define the passband, if more than one was used, with nn incrementing from 1.
RADESYS E Mnemonic for celestial coordinate reference system (typically 'FK5' or the preferred 'ICRS').
RA_TARG E Right Ascension coordinate of the target or field, in degrees
Recommended Keywords
APERTURE E Name of aperture used for exposure (if any)
DETECTOR E ID of detector used for exposure


  • Keyword records are listed in the above table alphabetically by name for ease of reference; contributor teams may choose the order of most keywords.
  • Deprecated FITS keywords (such as EPOCH) must not be used.