#FITS Keyword | Description | Proposed UCD1+ #Andrea, 10/10/2003 | Rev.17/05/2004 | # | | AIRMASS | air mass | obs.air.mass AIRT_EOS | air temperature at End of Scan | phys.temperature;obs.air AIRT_SOS | air temperature at Start of Scan | phys.temperature;obs.air AMASS_FC | approximate air mass at image center | obs.air.mass AM_EOS | air mass at End of Scan | obs.air.mass AM_SOS | air mass at Start of Scan | obs.air.mass APERTURE | name of field of view aperture | meta.id;instr.fov ARCFILE | archive file name | meta.id;meta.file ARYT_EOS | array temperature at End of Scan | phys.temperature;instr AUTHOR | author of the data | meta.bib.author BANDPASS | GSSS bandpass code | instr.bandpass BANDW | total bandwidth of observation | instr.bandwidth BAR_EOS | barometric pressure at End of Scan | phys.pressure;obs.air BAR_SOS | barometric pressure at Start of Scan | phys.pressure;obs.air BASE | pixel dwell time | time;instr.pixel BITPIX | bits per data value | meta.fits.bitpix BLANK | value used for undefined array elements | meta.code;meta.table BLOCKED | is physical blocksize a multiple of 2880? | meta.code;meta.fits BSCALE | linear factor in scaling equation | arith.factor BUNIT | physical units of the array values | meta.unit BZERO | zero point in scaling equation | arith.zp CALID | calibration identifiers for image | meta.id;phot.calib CDELTia | coordinate increment along axis ia | pos.wcs CDi_ja | linear transformation matrix (with scale) | pos.wcs CHECKSUM | checksum for the current HDU | meta.fits.software CHECKVER | version of checksum algorithm | meta.fits.software COMMENT | descriptive comment | meta.note CONFIGUR | s/w configuration used to process the data | meta.fits.software CONTINUE | denotes the CONTINUE long string keyword convention | meta.note CREATOR | name of software task that created the file | meta.id;meta.fits.software CROTAn | coordinate system rotation angle | pos.wcs CRPIXja | pixel coordinate of the reference point | pos.wcs CRVALia | coordinate system value at reference point | pos.wcs CTYPEa | axis type | pos.wcs CUNITia | units of CRVALia and CDELTia | pos.wcs DATAMAX | maximum data value | stat.max DATAMEAN | mean data value | stat.mean DATAMED | median data value | stat.median DATAMIN | minimum data value | stat.min DATAMODE | pre-processor dat mode | meta.fits.software DATARMS | RMS of data values | stat.stdev DATASUM | checksum of the dat records | meta.fits.software DATE | date of file creation | time.epoch;meta.fits DATE-END | date of the end of observation | time.end DATE-OBS | date of the observation | time.epoch DATE_EOS | U.T. date at End of Scan | time.end DATE_SOS | U.T. date at Start of Scan | time.start DAYNUM | sequential survey day number | time.epoch DEC | declination of the observed object | pos.eq.dec DEC_EOS | scan reference declination J2000 | pos.eq.dec DEC_NOM | nominal declination of the observation | pos.eq.dec DEC_OBJ | declination of the observed object | pos.eq.dec DEC_PNT | dec of the pointed direction of the instrument | pos.eq.dec DEC_SCX | declination of the X spacecraft axis | pos.eq.dec;instr DEC_SCY | declination of the Y spacecraft axis | pos.eq.dec;instr DEC_SCZ | declination of the Z spacecraft axis | pos.eq.dec;instr DEC_SOS | scan reference declination J2000 | pos.eq.dec DETNAM | name of detector used to make the observation | meta.id;instr.det DXFS | cross-scan frame step for image | # DYFS | in-scan frame step for image | # ELAPTIME | elapsed time of the observation | time.expo END | marks the end of the header keywords | meta.note EPOCH | equinox of celestial coordinate system | time.equinox EQUINOX | equinox of celestial coordinate system | time.equinox EXPOSURE | exposure time | time.expo EXPTIME | exposure time | time.expo EXTEND | may the FITS file contain extensions? | meta.code EXTLEVEL | hierarchical level of the extension | meta.code EXTNAME | name of the extension | meta.id;meta.code EXTVER | version of the extension | meta.id;meta.code FILENAME | name of the file | meta.id;meta.file FILETYPE | type of file | meta.code;meta.file FILTER | name of filter used during the observation | meta.id;instr.filter FILTERn | name of filters used during the observation | meta.id;instr.filter FLXSCALE | relative flux scale | arith.factor;phot.flux FN_PRNX | observatory filename prefix | meta.id;meta.file FOCUS | telescope focus setting | meta.code;instr.tel.focus FREQ0 | rest frequency | em.freq FREQR | reference frequency | em.freq GCOUNT | group count | meta.number;meta.fits GRATING | name of the grating used during observation | meta.id;instr.grating GRATINGn | name of the grating used during observation | meta.id;instr.grating GROUPS | indicates random groups structure | meta.note HA_EOS | hour angle at End of Scan | pos.az.ha HA_SOS | hour angle at Start of Scan | pos.az.ha HDUCLASS | general identifier for the classification of the data | meta.fits.hdu HDUCLASn | hierarchical classification of the data | meta.fits.hdu HDUDOC | reference to document describing the data format | meta.fits.hdu HDULEVEL | hierarchical level of the HDU | meta.fits.hdu HDUNAME | descriptive name of the HDU | meta.fits.hdu HDUVER | version number of the HDU | meta.fits.hdu HDUVERS | specific version of the document referenced by "HDUDOC" | meta.fits.hdu HIERARCH | denotes the HIERARCH keyword convention at ESO | meta.fits.eso HISTORY | processing history of the data | meta.note;meta.fits ICSVERSN | "ics" script version | meta.fits.software INHERIT | denotes the INHERIT keyword convention | meta.note;meta.fits INSTRUME | name of instrument | meta.id;instr IS_OFF1 | in-scan offset - SOS to frame 1 | # IS_OFF2 | in-scan offset - SOS to end frame | # JD-END | Julian Day at end | time.end JD-START | Julian Day at start | time.start JDAY | Julian Day of observation | time.epoch LATITUDE | geographic latitude of the observation | pos.earth.lat LIVETIME | exposure time after deadtime correction | time.expo MAGZP | calibrated zero point for image (magnitudes) | arith.zp;phot.calib MAPLAB | label of the map | meta.id;obs.field MISSION | mission name | meta.id;instr.obsty MJD-OBS | modified Julian Day at start | time.start MJDREF | modified Julian Day zero point for times | time.epoch MOONANGL | angle between the observation and the moon | pos.posAng NAXIS | number of axes | phys.dimens;meta.table NAXISn | size of the axis n | phys.size;meta.table.axis NEXTEND | Number of standard extensions | meta.number NOISE | noise value in map | instr.det.noise NORM | normalization factor in "fast fourier transform" | arith.factor;stat.Fourier NUMFRMS | number of frames in scan | meta.number OBJECT | name of observed object | meta.id;src OBJNAME | IAU name of observed object | meta.id;src OBSERVER | observer who acquired the data | obs.observer OBS_ID | unique observation ID | meta.id;obs OBS_MODE | instrumental mode of the observation | meta.code;instr.setup ONTIME | integration time during the observation | time.expo ORDATE | observation reference date | time.epoch ORIENTAT | position angle of image y axis (deg. E of N) | pos.posAng ORIGFILE | original file name | meta.id;meta.file ORIGIN | organization responsible for the data | meta.id;instr.obsty PA_PNT | position angle of the pointing | pos.posAng PCDEC | pointing center declination | pos.eq.dec;obs PCOUNT | parameter count | meta.number PCRA | pointing center R.A. | pos.eq.ra;obs PCi_ja | linear transformation matrix | pos.wcs PIXNAM | "pixphot" processing namelist configuration id | meta.fits.software PLATEID | GSSS plate id | meta.id;instr.plate PLTDECD | Dec (degrees) of plate center | pos.eq.dec.degrees;instr.plate PLTDECM | Dec (arcmin) of plate center | pos.eq.dec.arcmin;instr.plate PLTDECS | Dec (arcsec) of plate center | pos.eq.dec.arcsec;instr.plate PLTDECSN | Dec (sign) of plate center | pos.eq.dec.sign;instr.plate PLTGRADE | plate quality grade | meta.code;instr.plate PLTLABEL | observatory plate label | meta.id;instr.plate PLTRAH | R.A. (hours) of plate center | pos.eq.ra.hours;instr.plate PLTRAM | R.A. (minutes) of plate center | pos.eq.ra.minutes;instr.plate PLTRAS | R.A. (seconds) of plate center | pos.eq.ra.seconds;instr.plate PLTSCALE | plate scale (arcsec per mm) | instr.scale POSITNID | observatory scan position identifier | meta.id;pos,obs.field PROGRAM | the name of the s/w task that created the file | meta.id;meta.fits.software PSCALn | parameter scaling factor axis n | arith.factor PSi_ma | coordinate parameter m (char) | pos.wcs PTYPEn | name of random groups parameter | #meta.id PVi_ma | coordinate parameter m (float) | pos.wcs PZEROn | parameter scaling zero point | arith.zp RA | R.A. of the observation | pos.eq.ra;obs RADECSYS | coordinate reference frame | pos.frame RA_EOS | scan reference R.A. J2000 | pos.eq.ra;obs RA_NOM | nominal R.A. of the observation | pos.eq.ra;obs RA_OBJ | R.A. of the observed object | pos.eq.ra RA_PNT | R.A. of the pointed direction of the instrument | pos.eq.ra;instr RA_SCX | R.A. of the X spacecraft axis | pos.eq.ra;instr RA_SCY | R.A. of the Y spacecraft axis | pos.eq.ra;instr RA_SCZ | R.A. of the Z spacecraft axis | pos.eq.ra;instr RA_SOS | scan reference R.A. J2000 | pos.eq.ra;obs REFERENC | bibliographic reference | meta.bib REGION | GSSS region name | meta.id;instr.plate ROOTNAME | rootname of the file | meta.id;meta.file SATURATE | Data value at which saturation occurs | # SCANDIR | scan direction | # SCANIMG | name of original scan | meta.id;obs SCANNO | nightly scan number | meta.number;obs SCANNUM | identifies scan of the plate | meta.id;instr.plate SCHEDVER | scan scheduled version | meta.code;obs SCRPTFN | script template file name | meta.fits.software SCRPTVER | script template version | meta.fits.software SEESH | seeing shape parameter for image | instr.obsty.site.seeing SEE_EOS | seeing at End of Scan | instr.obsty.site.seeing SEE_SOS | seeing at Start of Scan | instr.obsty.site.seeing SIMPLE | does file conform to the Standard? | meta.code;meta.fits SITELAT | latitude of observatory | pos.earth.lat SITELONG | longitude of observatory | pos.earth.lon SKIPRDOS | number of frames skipped at start of scan | meta.number SKYSIG | point source filtered noise estimate for image | instr.det.noise SKYVAL | modal sky estimate for image | instr.det.noise STRIP_ID | 2MASS tile number | meta.id;obs.field ST_EOS | sidereal time at End of Scan | time.end ST_SOS | sidereal time at Start of Scan | time.start SUNANGLE | angle between the observation and the sun | pos.posAng TBCOLn | beginning column number | meta.id;meta.table.column TDBINn | default histogram bin size for the column | # TDIMn | dimensionality of the array | phys.dimens;meta.table.column TDISPn | display format | meta.code;meta.fits TDMAXn | maximum physical value in the column | stat.max TDMINn | minimum physical value in the column | stat.min TELAPSE | elapsed time of the observation | time.expo TELESCOP | name of telescope | meta.id;instr.tel TELNAME | telescope location (name of site) | instr.obsty.site TELT_EOS | telescope temperature at End of Scan | phys.temperature;instr.tel TELT_SOS | telescope temperature at Start of Scan | phys.temperature;instr.tel TFIELDS | number of columns in the table | meta.number;meta.table.column TFORMn | column data format | meta.code;meta.table.column THEAP | offset to starting data heap address | arith.diff;phys.size;meta.fits TIME-END | time at the end of the observation | time.end TIME-OBS | time at the start of the observation | time.start TIMEDEL | time resolution of data | time.resolution TIMER0 | read1 time | time;instr.setup TIMER1 | read2-read1 time | time;instr.setup TIMER2 | secondary settling time | time;instr.setup TIMEREF | time reference (barycenter/local) | meta.ref;time TIMESYS | time system | meta.ref;time TIMEUNIT | time unit | meta.unit;time TIMEZERO | clock correction | arith.factor;time TIMVERSN | timing system definition | meta.ref;time TITLE | title for the observation or data | meta.id;obs TLMAXn | maximum legal value in the column | stat.max TLMINn | minimum legal value in the column | stat.min TNULLn | value used to indicate undefined table element | meta.code;meta.table TOT-EXPT | total cumulative exposure time | time.expo TOT-IMAG | total number of images | meta.number;obs.image TSCALn | linear data scaling factor | arith.factor TSORTKEY | defines the sort order of a table | # TSTART | start time of observation | time.start TSTOP | end time of observation | time.end TTYPEn | column name | meta.id;meta.table.column TUNITn | column units | meta.unit;meta.table.column TYPE | scan type | meta.code;obs TYPEn | name of random groups parameter | # TZEROn | column scaling zero point | arith.zp;meta.table.column USXREF | 2MASS U-scan X coordinate at image center | # USYREF | 2MASS U-scan Y coordinate at image center | # UT | U.T. time at start | time.start UT_DATE | U.T. date of scan | time.epoch UT_EOS | U.T. at End of Scan | time.end UT_OFF1 | U.T. offset - Start Of Scan to frame 1 | arith.diff;time.start UT_SOS | U.T. at Start of Scan | time.start VEL | center velocity | src.veloc VELCODE | code for center velocity | meta.code;src.veloc VELR | reference velocity | src.veloc WAVEF_P | secondary waveform data file | meta.id;meta.file WCSAXESa | number of axes in WCS description | pos.wcs WDIR_EOS | wind direction at End of Scan | obs.air.wind WDIR_SOS | wind direction at Start of Scan | obs.air.wind WSPD_EOS | wind speed at End of Scan | obs.air.wind WSPD_SOS | wind speed at Start of Scan | obs.air.wind XPIXELSZ | x pixel size | phys.size;instr.pixel XS_OFF1 | x-scan offet - SOS to frame 1 | # XS_OFF2 | x-scan offet - SOS to end frame | # XTENSION | marks beginning of new HDU | meta.note;meta.fits.hdu YPIXELSZ | y pixel size | phys.size;instr.pixel ZD_EOS | zenith distance at End of Scan | pos.az.zd ZD_SOS | zenith distance at Start of Scan | pos.az.zd ZP | zero point calibration | arith.zp;phot.calib ZP_ERR | error in zero point | stat.error;arith.zp;phot.calib