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Metadata that apply to light-curves |
Light Curves in Tables
The keywords listed below are required, recommended, or suggested for all FITS files that contain light curves. Since at present light curves are only supported in tabular 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.
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Headers must also include the basic structural FITS keywords and the list of common keywords.
| Keyword | HDU | Notes | |
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APERTURE | E | Name of aperture used for exposure (if any) | |
BUNIT | E | Brightness unit for array values | |
DEC_TARG | E | Declination coordinate of the target or field, in degrees | |
DETECTOR | E | ID of detector used for exposure | |
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 (zero-padded) 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 |
Light Curves in ASCII Files
Light curves may alternatively be stored in ASCII-based formats (JWST uses ECSV). In this case it is important to include metadata as tagged attributes within the file, the details of which depend upon the specific format. Attributes in ECSV uses a YAML-based header with special mark-up, for example.