The following tables define the mapping (in version 5.3 of the JCMT storage task) from item names that will be found in the data files (the “NRAO” name) to the JCMT name. Also included is the nominal FITS header equivalent, emphasis indicating a JCMT-specific variant, and a text description of the field.
NRAO | JCMT | FITS | Description |
CELL_V2Y | CELL_V2Y | YPOSANG | Position angle of cell y axis (CCW) |
UAZ | SDIS(36) | UXPNT | User az correction |
UEL | SDIS(37) | UYPNT | User el correction |
C1BKE | BACKEND | BACKEND | Name of the backend |
C1BTYP | BE_TYPE | BACKTYPE | Type of backend |
C1DP | DATA_PRECISION | PRECIS | Precision of the data from the backend |
C1FTYP | FE_TYPE | FRONTYPE | Type of frontend |
C1HGT | TEL_HEIGHT | HEIGHT | Height of telescope above sea level |
C1IFS | IF_DEVICE | IFDEVICE | Name of the IF device |
C1LAT | TEL_LATITUDE | LATITUDE | Geodetic latitude of telescope (North +ve) |
C1LONG | TEL_LONGITUDE | LONGITUD | Geographical longitude of telescope (West +ve) |
C1OBS | PROJECT_OBS_1 | OBSID | Name of the primary observer |
C1ONA | PROJECT_OBS_1 | OBSERVER | Name of the primary observer |
C1ONA1 | PROJECT_OBS_2 | OBSERVER | Name of the support scientist |
C1ONA2 | PROJECT_OBS_3 | OPERATOR | Name of the telescope operator |
C1PID | PROJECT | PROJID | Identifies the observing program |
C1RCV | FRONTEND | FRONTEND | Name of the frontend |
C1SNA1 | CENTRE_NAME_1 | OBJECT | Source name part 1 |
C1SNA2 | CENTRE_NAME_2 | OBJECT2 | Source name part 2 or altern. name |
C1SNO | NOBS | SCAN | Observation number |
C1STC | OBS_TYPE | OBSTYPE | Type of observation |
C1TEL | TEL_NAME | TELESCOP | Telescope name |
C2FL | DY | FOCUSL | Secondary mirror y displacement from nominal at observation start |
C2FR | DZ | FOCUSR | Secondary mirror z displacement from nominal at observation start |
C2FV | DX | FOCUSV | Secondary mirror x displacement from nominal at observation start |
C2ORI | SECONDARY_ORI | ORIENT | Rotation or polarization angle orientation of the frontend/reflector |
C2PC1 | TEL_PC_LAN | PTCON1 | Angle by which lower axis is north of ideal |
C2PC2 | TEL_PC_LAE | PTCON2 | Angle by which lower axis is east of ideal |
C2PC3 | TEL_PC_UANP | PTCON3 | Angle by which upper axis is not perpendicular to lower |
C2PC4 | TEL_PC_BNP | PTCON4 | Angle by which beam is not perpendicular to upper axis |
C2XPC | TEL_PC_LAZ | AXPOINT | Azimuth/RA enc.zero; enc.reading = az + pc_laz |
C2YPC | TEL_PC_UAZ | AYPOINT | Altitude/DEC enc.zero; enc.reading = az + pc_uaz |
C3BEFENULO | BES_FE_NULO | BEFENULO | Copy of frontend LO frequency per backend section |
C3BEFESB | BES_FE_SB_SIGN | BEFESB | Copy of frontend sideband sign per backend section |
C3BEINCON | BE_IN_CONN | BEINCON | IF output channels connected to BE input channels |
C3BESCONN | BES_CONN | BESCON | BE input channels connected to this section |
C3BESSPEC | BES_SPECTRUM | BESSPEC | Subsystem nr to which each backend section belongs. |
C3BETOTIF | BES_TOT_IF | BETOTIF | Total IF per backend section |
C3CAL | OBS_CALIBRATION | OBSCAL | Calibration observation? |
C3CEN | OBS_CENTRE | OBSCEN | Centre moves between scans? |
C3CL | CYCLE_TIME | CYCLLEN | Duration of each cycle |
C3CONFIGNR | DAS_CONF_NR | CONFIG | Backend configuration |
C3DASCALSRC | DAS_CAL_SOURCE | CALSRC | DAS calibration source for backend calibration (POWER or DATA) |
C3DASOUTPUT | DAS_OUTPUT | OUTPUT | Description of output in DAS DATA (SPECTRUM, T_REC, T_SYS, etc.) |
C3DASSHFTFRAC | DAS_SHIFT_FRAC | SHFTFRAC | DAS calibration source for backend calibration (POWER or DATA) |
C3DAT | OBS_UT1D | UTDATE | UT1 date of observation |
C3FLY | OBS_CONTINUOUS | OBSFLY | Data taken on the fly or in discrete mode? |
C3FOCUS | OBS_FOCUS | OBSFOCUS | Focus observation? |
C3INTT | INTGRN_TIME | INTGR | Scan integration time |
C3LSPC | NO_BES_O_CH | NOBESDCH | Number of channels per backend section |
C3LST | OBS_LST | LST | Local sidereal time at the start of the observation |
C3MAP | OBS_MAP | OBSMAP | Map observation? |
C3MXP | NO_SCAN_PNTS | NOSCNPTS | Maximum number of map points done in a phase |
C3NCH | NO_BE_O_CH | NOBEOCH | No.backend output channels |
C3NCI | NO_CYCLES | NOCYCLES | Maximum number of cycles in the scan |
C3NCP | NO_CYCLE_PNTS | NOCYCPTS | Total number of xy positions observed during a cycle |
C3NCYCLE | NCYCLE | NCYCLE | Number of cycles done in the scan |
C3NFOC | NO_FE_O_CH | NOFCHAN | NO_FE_O_CH:No. of frontend output channels |
C3NIS | NO_SCANS | NOSCANS | Number of scans |
C3NLOOPS | NO_SCANS | NSCANS | Number of scans per observation commanded at observation start |
C3NMAP | NO_MAP_PNTS | NOPTS | Number of map points |
C3NOIFPBES | NO_IF_PER_BES | NOIFPBES | Number of IF inputs to each section (2 for correlator, 1 for AOS) |
C3NO_SCAN_VARS1 | NO_SCAN_VARS1 | NOSCNVR1 | Number of scan table 1 variables |
C3NO_SCAN_VARS2 | NO_SCAN_VARS2 | NOSCNVR2 | Number of scan table 2 variables |
C3NPP | NO_MAP_DIMS | NOMAPDIM | Number of dimension in the map table |
C3NRC | NRC | NORCHAN | NO_BE_I_CH:No.backend input channels |
C3NRS | NO_BES | NORSECT | Number of backend sections |
C3NSAMPLE | NSCAN | NSCAN | Number of scans done |
C3NSV | NO_PHASE_VARS | NOSWVAR | Number of phase table variables |
C3OVERLAP | BES_OVERLAP | OVERLAP | Subband overlap |
C3PPC | NO_PHASES | NOPHASE | Number of phases per cycle |
C3SRT | SCAN_TIME | SAMPRAT | Total time of scan (=total integration time if OBS_CONTINUOUS = .FALSE.) |
C3UT | OBS_UT1H | UT | UT1 hour of observation |
C3UT1C | OBS_UT1C | UT1C | UT1-UTC correction interpolated from time service telex (in days) |
C4AMPL_EW | AMPL_EW | CHOPAZ | Secondary mirror chopping amplitude parallel to lower axis |
C4AMPL_NS | AMPL_NS | CHOPEL | Secondary mirror chopping amplitude parallel to upper axis |
C4AXY | CELL_X2Y | XYANGLE | Angle between cell y axis and x-axis (CCW) |
C4AZ | CENTRE_AZ | AZ | Azimuth at observation date |
C4AZERR | SDIS(7) | XPOINT | DAZ:Net Az offset at start (inc.tracker ball setting and user correction) |
C4CECO | CENTRE_CODE | COORDCD2 | centre coords. AZ= 1;EQ=3;RD=4;RB=6;RJ=7;GA=8 |
C4CSC | CENTRE_COORDS | COORDCD | Character code of commanded centre or source coordinate system |
C4DAZ | DAZ_SM | XPOINT | Telescope lower axis correction for secondary mirror XYZ |
C4DECDATE | CENTRE_DEC | DECDATE | Declination of date |
C4DEL | DEL_SM | YPOINT | Telescope upper axis correction for secondary mirror XYZ |
C4DO1 | CELL_X | DESORG1 | Cell x dimension; descriptive origin item 1 |
C4DO2 | CELL_Y | DESORG2 | Cell y dimension; descriptive origin item 2 |
C4DO3 | CELL_V2X | DESORG3 | Angle by which the cell x axis is oriented with respect to local vertical |
C4EDC | CENTRE_DEC | EPOCDEC | Declination of date |
C4EDEC | CENTRE_DEC1950 | EPOCDEC | Declination of source for EPOCH |
C4EDEC2000 | CENTRE_DEC2000 | DECJ2000 | Declination J2000 |
C4EL | CENTRE_EL | EL | Elevation at observation date |
C4ELERR | SDIS(8) | YPOINT | DEL:Net El offset at start (inc.tracker ball setting and user correction) |
C4EPH | CENTRE_EPOCH | EPOCH | Date of the RA/DEC coordinates (1950) |
C4EPT | EPOCH_TYPE | EPOCHTYP | Type of epoch, JULIAN, BESSELIAN or APPARENT |
C4ERA | CENTRE_RA1950 | EPOCRA | Right ascension of source for EPOCH |
C4EW_ENCODER | AMPL_E_SET | EW_ENCOD | Secondary mirror ew encoder value |
C4EW_SCALE | EW_AMPL_SCALE | EW_SCALE | Secondary mirror ew chop scale |
C4FRQ | FREQUENCY | CHOPFREQ | Secondary mirror chopping period |
C4FUN | WAVEFORM | WAVEFORM | Secondary mirror chopping waveform |
C4GB | CENTRE_GB | GALLAT | Galactic latitude |
C4GL | CENTRE_GL | GALLONG | Galactic longitude |
C4LSC | CELL_COORDS | FRAME | Char. code for local x-y coord.system |
C4MCF | CENTRE_MOVING | CENMOVE | Centre moving flag (solar system object) |
C4MOCO | TEL_COORDS | MOUNTING | Mounting of telescope; defined as LOWER/UPPER axes, e.g; AZ/ALT |
C4NS_ENCODER | AMPL_N_SET | NS_ENCOD | Secondary mirror ns encoder value |
C4NS_SCALE | NS_AMPL_SCALE | NS_SCALE | Secondary mirror ns chop scale |
C4ODCO | CELL_UNIT | MAPUNIT | Units of cell and mapping coordinates;offset definition code |
C4OFFS_EW | OFFS_EW | EWTILT | Secondary mirror offset parallel to lower axis (East-West Tilt) |
C4OFFS_NS | OFFS_NS | NSTILT | Secondary mirror offset parallel to upper axis (North-South Tilt) |
C4PER | PERIOD | CHOPTIME | Secondary mirror chopping period |
C4POSANG | POSANG | CHOPDIRN | Secondary mirror chop position angle |
C4RA2000 | CENTRE_RA2000 | RAJ2000 | Right ascension J2000 |
C4RADATE | CENTRE_RA | RADATE | Right Ascension of date |
C4RX | REFERENCE_X | XREF | Reference x position (JCMT cells wrt to centre; NRAO abs. degrees) |
C4RY | REFERENCE_Y | YREF | Reference y position (JCMT cells wrt to centre; NRAO abs. degrees) |
C4SM | CHOPPING | CHOPPING | Secondary mirror is chopping |
C4SMCO | COORDS | CHOPCOOR | Secondary mirror chopping coordinate system |
C4SX | CENTRE_OFFSET_X | XSOURCE | Commanded x centre position (JCMT cells wrt to centre; NRAO abs. degrees) |
C4SY | CENTRE_OFFSET_Y | YSOURCE | Commanded y centre position (JCMT cells wrt to centre; NRAO abs. degrees) |
C4THROW | THROW | CHOPTHRW | Secondary mirror chop throw |
C4X | X | AFOCUSV | Secondary mirror absolute X position at observation start |
C4Y | Y | AFOCUSH | Secondary mirror absolute Y position at observation start |
C4Z | Z | AFOCUSR | Secondary mirror absolute Z position at observation start |
C5AT | TAMB | TAMB | Ambient temperature |
C5DP | DEW_POINT | DEW_PT | Mean atmospheric dew point |
C5IR | REF_INDEX | REFRAC | Mean atmospheric refractive index (alternative) |
C5IR1 | TEL_REFR_A | REFRAC1 | Refraction constant A (see MTIN026) |
C5IR2 | TEL_REFR_B | REFRAC2 | Refraction constant B (see MTIN026) |
C5IR3 | TEL_REFR_C | REFRAC3 | Refraction constant C (see MTIN026) |
C5MM | VAP_PRESSURE | MMH2O | Mean atmospheric vapour pressure |
C5PRS | PAMB | PRESSURE | Mean atmospheric pressure |
C5RH | HAMB | HUMIDITY | Mean atmospheric relative humidity |
C6CYCLREV | CYCLE_REVERSAL | CYCLREV | Cycle reversal flag |
C6DX | CELL_X | DELTAX | Cell x dim,; descriptive origin item 1 |
C6DY | CELL_Y | DELTAY | Cell y dimension; descriptive origin item 2 |
C6FC | CELL_CODE | FRAME2 | Local x-y AZ= 1;EQ=3;RD=4;RB=6;RJ=7;GA=8 |
C6MODE | SWITCH_MODE | SWMODE | Observation mode |
C6MSA | CELL_V2X | SCANANG | Scanning angle - angle from local vertical to x axis measured CW |
C6NP | NCYCLE_PNTS | NCYCPTS | Number of sky points completed in the observation |
C6REV | SCAN_REVERSAL | REVERSAL | Map rows scanned in alternate directions? |
C6SD | OBS_DIRECTION | DIRECTN | Map rows are in X (horizontal) or Y(vertical) direction |
C6ST | OBS_TYPE | OBSMODE | Type of observation |
C6XGC | X_MAP_START | XCELL0 | X coordinate of the first map point |
C6XNP | NO_X_MAP_PNTS | NOXPTS | X map dimension; number of points in the x-direction |
C6XPOS | X_MAP_POSITIVE | XSIGN | In first row x increases (TRUE) or decreases (FALSE) |
C6YGC | Y_MAP_START | YCELL0 | Y coordinate of the first map point |
C6YNP | NO_Y_MAP_PNTS | NOYPTS | Y map dimension; number of points in the y-direction |
C6YPOS | Y_MAP_POSITIVE | YSIGN | In first row y increases (TRUE) or decreases (FALSE) |
C7AP | APERTURE | APERTURE | Aperture |
C7BCV | BAD_CHANNEL | BADCHV | Bad channel value |
C7CAL | CAL_TYPE | TYPECAL | Calibration type (standard or direct, chopperwheel) |
C7FIL | FILTER | FILTER | Filter |
C7HP | FWHM | FWHM of the beam profile (mean) |
|
C7NIF | NO_IF_CH | NOIFCHAN | Number of IF channels |
C7OSN | OBS_REF_SCAN | OFFSCAN | Calibration observation number (in which a standard was observed) |
C7PHASE | PHASE | PHASE | Lockin phase |
C7SEEING | SAO_SEEING | SEEING | Seeing at JCMT |
C7SEETIME | SAO_YYMMDDHHMM | SEETIME | SAO seeing time (YYMMDDHHMM) |
C7SNSTVTY | SENSITIVITY | SNSTVTY | Lockin sensitivity in scale range units |
C7SNTVTYRG | RANGE | SNTVTYRG | Sensitivity range of lockin |
C7SZVRAD | SZVRAD | SZVRAD | Number of elements of vradial array |
C7TAU225 | CSO_TAU | TAU225 | CSO tau at 225GHz |
C7TAURMS | CSO_TAU_RMS | TAURMS | CSO tau rms |
C7TAUTIME | CSO_YYMMDDHHMM | TAUTIME | CSO tau time (YYMMDDHHMM) |
C7TIMECNST | TIME_CONSTANT | TIMECNST | Lockin time constant |
C7VC | VEL_COR | RVSYS | Velocity correction |
C7VR | VELOCITY | VELOCITY | Radial velocity of the source |
C7VRD | VEL_DEF | VELDEF | Velocity definition code; method of computing the velocity |
C7VREF | VEL_REF | VELREF | Velocity reference code; reference point for telescope & source velocity |
C8AAE | APERTURE_EFF | APPEFF | Ratio total power observed/incident on the telescope |
C8ABE | BEAM_EFF | BEAMEFF | Fraction of beam in diffraction limited main beam |
C8EF | ETAFSS | ETAFSS | Forward spillover and scattering efficiency |
C8EL | ETAL | ETAL | Rear spillover and scattering efficiency |
C8GN | ANTENNA_GAIN | ANTGAIN | Antenna gain |
C9OT | TEL_TOLERANCE | OBSTOL | Observing tolerance |
C11PHA | PHASE_TABLE | PHASTB | Phase table: switching scheme dependent |
C11VD | PHASE_VARS | VARDES | Names of the cols. of phase table |
C12ALPHA | BES_ALPHA | ALPHA | Ratio of signal sideband to image sideband sky transmission |
C12BM | BES_BITMODE | BM | Correlation bit mode |
C12BW | BANDWIDTH | BW | Bandwidth |
C12CAL | DATA_UNITS | DATAUNIT | Units of spectrum data |
C12CALTASK | BE_CAL_TASK | CALTASK | Calibration instrument used (FE, BE, or USER) |
C12CALTYPE | BE_CAL_TYPE | CALTYPE | Type of calibration (THREELOADS or TWOLOADS) |
C12CF | FE_NUOBS | OBSFREQ | Centre frequency |
C12CM | BES_CORR_MODE | CM | Correlation function mode |
C12CT | TCAL | TCAL | Calibration temperature |
C12ETASKY | BES_ETA_SKY | ETA_SKY | Sky transmission from last calibration |
C12ETASKYIM | BES_ETA_SKY_IM | ETA_SKY_ | Frontend-derived sky transmission |
C12ETATEL | BES_ETA_TEL | ETA_TEL | Telescope transmission |
C12FR | DELTANU | FREQRES | Frequency resolution [MHz] |
C12GAINS | GAIN | GAINS | Gains |
C12GNORM | G_NORM | GNORM | Data normalisation factor |
C12GREC | GREC | Raw data units per Kelvin |
|
C12GS | BES_G_S | G_S | Normalizes signal sideband gain |
C12INFREQ | BE_NUIN | INFREQ | BE input frequencies [GHz] |
C12NOI | NOISE | NOISE | Noise value |
C12REDMODE | BE_RED_MODE | REDMODE | Way of calibrating the data (RATIO or DIFFERENCE) |
C12RF | FE_NUREST | RESTFREQ | Rest frequency |
C12RST | TSYS_OFF | RTSYS | Reference system temperature |
C12RT | TREC | TRX | Receiver temperature |
C12SBRAT | BE_SB_RATIO | SBRATIO | Sideband ratio |
C12SCAN_TABLE_1 | SCAN_TABLE1 | SCANTAB1 | Begin scan table |
C12SCAN_TABLE_2 | SCAN_TABLE2 | SCANTAB2 | End scan table |
C12SCAN_VARS1 | SCAN_VARS1 | SCANVRS1 | Names of the cols. of scan table1 |
C12SCAN_VARS2 | SCAN_VARS2 | SCANVRS2 | Names of the cols. of scan table2 |
C12SST | TSYS_ON | STSYS | Source system temperature |
C12TAMB | T_HOT | THOT | Ambient load temperature |
C12TASKY | BES_TA_SKY | TA_SKY | Ratio of signal sideband to image sideband sky transmission |
C12TCOLD | T_COLD | TCOLD | Cold load temperature |
C12TSKY | TSKY | TSKY | Sky temperature at last calibration |
C12TSKYIM | BES_T_SKY_IM | T_SKY_IM | Frontend-derived Tsky, image sideband |
C12TSYSIM | BES_T_SYS_IM | T_SYS_IM | Frontend-derived Tsys, image sideband |
C12TTEL | TTEL | TTEL | Telescope temp. from last skydip |
C12VCOLD | IF_V_COLD | VCOLD |
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C12VDEF | VEL_DEFN | Velocity definition code - radio, optical, or relativistic |
|
C12VHOT | IF_V_HOT | VHOT |
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C12VREF | VEL_REF | Velocity frame of reference - LSR, Bary-, Helio-, or Geo- centric |
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C12VSKY | IF_V_SKY | VSKY |
|
C12WO | H2O_OPACITY | TAUH2O | Water opacity |
C13DAT | DATA | SPECT | Reduced data |
C13ERR | ERROR | TRMS | Standard error |
C13RAW_ERROR | DATA_ERROR | RAWERROR |
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C13RAW_ERROR_OP | RAW_ERROR_OP | RAWERROR | Raw (out of phase) error also to be stored at end scan |
C13RESP | RESP | RESP | array of responsivities |
C13SPV | SAMPLES | RAWSPECT |
|
C13SPV_OP | SAMPLES_OP | RAWSPECT | Raw out of phase data samples in each phase |
C13STD | STDEV | STDSPECT | Phase data standard deviation |
C14PHIST | MAP_TABLE | MAPTABLE | List of xy offsets for each scan |
C90T | TEL_TOLERANCE | OBSTOL | Observing tolerance |