| Keyword | HDU | Notes |
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| DATE-BEG | P or E | ISO-8601 formatted DateTime string for start of an observation (or, the start of the first observation of a combined product), in the time system specified by TIMESYS . May use MJD-BEG in addition or instead. For catalogs, this time should reflect the time of the earliest observation of the entries. |
| DATE-END | P or E | ISO-8601 formatted DateTime for end of an observation (or, the end of the last observation of a combined product), in the time system specified by TIMESYS . May use MJD-END in addition or instead. For catalogs, this time should reflect the time of the latest observation of the entries. |
| DOI | P | Digital Object Identifier for the HLSP data collection |
| EQUINOX | E | Equinox of the celestial coordinate system. This keyword must not be used if RADESYS = 'ICRS' |
| HLSPID | P | The identifier (acronym) for this HLSP collection |
| HLSPLEAD | P | Full name of HLSP project lead |
| HLSPNAME | P | Title for HLSP project, long form |
| HLSPTARG | P | Designation of the target(s) or field(s) for this HLSP |
| HLSPVER | P | Version identifier for this HLSP product |
| INSTRUME | P | Designation of instrument used for this observation |
| LICENSE | P | License for use of these data, with the value 'CC BY 4.0 ' |
| LICENURL | P | Data license URL, with the value 'https://creativecommons.org/licenses/by/4.0/' |
| MJD-BEG | P or E | Start time of observation (or, the start of the first observation of a combined product), expressed as MJD. May use DATE-BEG in addition or instead. For catalogs, this time should reflect the time of the earliest observation of the entries. |
| MJD-END | P or E | End time of exposure (or, the end of the last observation of a combined product), expressed as MJD, in the time system specified by TIMESYS . May use DATE-END in addition or instead. For catalogs, this time should reflect the time of the earliest observation of the entries. |
| MJD-MID | P or E | Mid-time of exposure (or, the mid-point of a series of observations), expressed as MJD, in the time system specified by TIMESYS . May use DATE-AVG in addition or instead. For catalogs, this time should reflect the time of the earliest observation of the entries. |
| OBSERVAT | P | Observatory used to obtain this observation. |
| PROPOSID | P | Observatory program/proposal identifier, if applicable |
| REFERENC | P | Bibliographic identifier (ADS bibcode) for reference where these data were published |
| TELAPSE | P or E | Time elapsed between start- and end-time of observation |
| TELESCOP | P | Designation of telescope used for this observation |
| TIMESYS | P or E | Character string code (see FITS Standard) for time scale of time-related keywords. Ex: 'UTC' |
| XPOSURE | P or E | Duration of exposure, exclusive of dead time |