| ARCFILE | str | Archive file name | | |
| DATE | datetime | UTC date the original data file was saved | | time.obs |
| DATE_OBS | datetime | UTC date at the start of the observation | | time.obs |
| EXPTIME | float | Total exposure time | sec | time.expo |
| filename | str | The name of the associated file | | meta.id meta.file |
| filter | Filter | Information about the filter | | instr.filter meta.id |
| globalname | str | The name used to store and retrieve file to and from Storage | | meta.id |
| instrument | Instrument | Information about the instrument | | instr.obsty |
| LST | float | Local sidereal time at the start of the observation expressed as the number of seconds (a float) since UTC midnight | sec | time |
| MJD_OBS | float | Modified Julian date at the start of the observation (JD-2400000.5) | day | time_obs |
| OBJECT | str | Object name | | meta.id |
| OBSERVER | str | The observer | | obs.observer |
| observing_block | ObservingBlock | Information about the observing block | | |
| template | Template | Information about the template | | |
| UTC | float | Universal Coordinated Time (UTC) at the start of the observation expressed as the number of seconds (a float) since UTC midnight | sec | time |
