Most of the metadata in catalogs is often in the definition of the database
fields, or table column names, units, and numeric types. Below are the
recommended fields for source catalogs, where text in brackets is entirely
||Alphanumeric identifier of source
||Right ascension coordinate of source
||Declination coordinate of source
||Brightness of source in the passband named <Filt>,
with NULL value (NaN) indicating no measurement
||Uncertainty in source brightness.
||Applicable, encoded flags that apply to the brightness in the named
passband, with the convention that zero indicates no pathologies.
- Deprecated FITS keywords (such as EPOCH)
must not be used.