| access_url | | meta.ref.url | A URL that can be used to download the raw file; if the file is under proprietary period, only authenticated users with the necessary access rights will be given access to it. |
| datalink_url | | meta.ref.url | A URL that can be used to find the access points of the raw file itself, and of all its related files. Related files are: the calibration files necessary to reduce a science raw frame (see calSelector entries), and, if available, a (list of) calibrated product(s) generated out of it.) |
| date_obs | | time.start;obs.exposure | The content of the DATE_OBS keyword exposed as a string and not a datetime field (ESO_DATEADD_SEC does not work on this column, use exp_start instead). |
| dec | deg | pos.eq.dec;meta.main | Declination FK5 J2000 |
| dec_pnt | deg | pos.eq.dec;instr.tel | Pointing Declination FK5 J2000 of the telescope |
| det_chip1id | | | Detector chip identification. Read from keyword DET CHIP1 ID (alias DET CHIP ID). Example: HASCI03 |
| det_chop_ncycles | | | Number of cycles for chopping. Read from keyword DET CHOP NCYCLES. Example: 1 |
| det_dit | s | | Detector Integration Time (Infrared instruments). |
| det_expid | | | Unique exposure ID number. Read from keyword DET EXP ID (aliases DET EXPO NO, DET EXP NO). |
| det_ndit | | | Number of exposures, each with det_dit integration time (Infrared instruments). |
| dp_cat | | meta.code.class;obs | Observation category: SCIENCE,CALIB,ACQUISITION,TECHNICAL,TEST,SIMULATION,OTHER |
| dp_id | | meta.id;meta.dataset | The main unique ESO archive file identifier |
| dp_tech | | meta.code.class;instr.setup | Mode/technique used for the observation |
| dp_type | | meta.code.class;obs | Type of observation/exposure |
| ecl_lat | deg | pos.ecliptic.lat | Ecliptic latitude of the observation. |
| ecl_lon | deg | pos.ecliptic.lon | Ecliptic longitude of the observation. |
| exp_start | | time.start;obs.exposure | The start time of the observation (format: ISO-8601). |
| exposure | s | time.duration;obs.exposure | Total exposure time on target. |
| filter_path | | instr.setup;instr.filter | All filters. The string is in the format <value>,<value>,... where <value> is the value of one of the keywords INS.FILT*.NAME |
| gal_lat | deg | pos.galactic.lat | Galactic latitude of the observation. |
| gal_lon | deg | pos.galactic.lon | Galactic longitude of the observation. |
| grat_path | | instr.setup | All gratings. The string is in the format <value>, <value>,... where <value> is the value of one of the keywords INS.GRAT*.NAME. |
| gris_path | | instr.setup | All grisms. The string is in the format <value>, <value>,... where <value> is the value of one of the keywords INS.GRIS*.NAME. Example: GRIS_600B |
| ins_mode | | instr.setup | Instrument mode |
| instrument | | meta.id;instr | Instrument name |
| last_mod_date | | time | The last modification date of this record (format: ISO-8601). |
| mjd_obs | d | time.start;obs | Modified Julian Date (JD - 2400000.5) of the start of the observation. |
| ob_id | | meta.id;obs;meta.main | The identifier of the ESO Observation Block, a unique numeric ID assigned by the Observation Handling System |
| ob_name | | meta.id;obs | The name of the ESO Observation Block |
| object | | meta.id;src | Target designation as given by the astronomer, though at times overwritten by the obeservatory, especially for CALIB observations. Compare with the similar field called "target".) |
| obs_mode | | obs.param | Service or Visitor mode |
| origfile | | meta.id;meta.file | The original file name as used on the instrument workstation at the telescope. Read from keyword ORIGFILE. Example: HD75289_0012.fits |
| period | | obs.proposal.cycle | ESO proposal cycle |
| pi_coi | | meta.curation;obs.observer | Names of the Principal and Co-Investigators |
| prog_id | | meta.code;obs | ESO program run identification code |
| prog_title | | meta.title;obs.proposal | Title of the observing programme |
| prog_type | | meta.code.class;obs.proposal | Program type: 0=Normal, 1=GTO, 2=DDT, 3=ToO, 4=Large, 5=Short, 6=Calibration, 7=Monitoring MAPPING |
| ra | deg | pos.eq.ra;meta.main | Right Ascension FK5 J2000 |
| ra_pnt | deg | pos.eq.ra;instr.tel | Pointing Right Ascension FK5 J2000 of the telescope |
| release_date | | time.release;obs | The date at which the data become publicly available at the end of the proprietary period |
| slit_path | | instr.setup | All slits. The string is in the format <value>, <value>,... where <value> is the value of one of the keywords INS.SLIT*.NAME. |
| target | | meta.id;src | Target designation (as given by the astronomer) |
| tel_airm_end | | obs.airMass;time.end | The airmass at the end of the observation. |
| tel_airm_start | | obs.airMass;time.start | The airmass at the start of the observation. |
| tel_alt | deg | pos.az.alt;time.start | The Altitude angle (deg) at the start of the observation. |
| tel_ambi_fwhm_end | arcsec | instr.obsty.seeing;time.end | The seeing measured by XXX at the end of the observation. |
| tel_ambi_fwhm_start | arcsec | instr.obsty.seeing;time.start | The seeing measured by XXX at the start of the observation. |
| tel_ambi_pres_end | hPa | phys.pressure;obs.atmos;instr.obsty;time.end | The atmospheric pressure measured by XXX at the end of the observation. |
| tel_ambi_pres_start | hPa | phys.pressure;obs.atmos;instr.obsty;time.start | The atmospheric pressure measured by XXX at the start of the observation. |
| tel_ambi_rhum | | | The atmospheric relative humidity measured by XXX at the time of the observation. |
| tel_az | deg | pos.az.azi;time.start | The Azimuth angle (deg) S=0,W=90 at the start of the observation. |
| telescope | | meta.id;instr.tel | The name of the telescope. |
| tpl_expno | | meta.number;obs | The exposure number within its template execution. |
| tpl_id | | meta.id;obs | The observing template identifier, a unique ID assigned to a template, that is, to a pre-defined sequence of operations involving any combination of telescope, instrument and detector actions |
| tpl_name | | meta.title;obs | The name of the observing template. |
| tpl_nexp | | meta.number;obs;stat.max | The total number of exposures for the given template. |
| tpl_seqno | | meta.code.member;obs.sequence | The template sequence number within the Observing Block |
| tpl_start | | meta.id;obs;time.start | The start time of the execution of the observing template, exposed as a string and not as a datetime field as this is used as an identifier (ESO_DATEADD_SEC does not work on this column). |