Skydip

This is a typical SKYDIP FITS header:

ACCEPT  = 'NO      '           / accept update; PROMPT, YES or NO
ALIGN_AX= 'not used'           / Alignment measurements in X or Y axis
ALIGN_SH=                   -1 / Distance between successive alignment offsets (
ALT-OBS =                 4092 / Height of observatory above sea level (metres)
AMEND   =             3.863703 / Airmass at end of observation
AMSTART =             1.015427 / Airmass at start of observation
APEND   =              627.851 / Air pressure at end of observation (mbar)
APSTART =              627.851 / Air pressure at start of observation (mbar)
ATEND   =             5.604397 / Air temp. at end of observation (C)
ATSTART =             5.677658 / Air temp. at start of observation (C)
BOLOMS  = 'SHORT_DC,LONG_DC'   / Names of bolometers measured
CALIBRTR=                    F / Internal calibrator is on or off
CAL_FRQ =                   -1 / Calibrator frequency (Hz)
CENT_CRD= 'AZ      '           / Centre coordinate system
CHOP_CRD= 'not used'           / Chopper coordinate system
CHOP_FRQ=                    2 / Chopper frequency (Hz)
CHOP_FUN= 'not used'           / Chopper waveform
CHOP_PA =                   -1 / Chopper P.A., 0 = in lat, 90 = in long
CHOP_THR=                   -1 / Chopper throw (arcsec)
DATA_DIR= '19990808'           / Sub-directory where datafile was stored
DATA_KPT= 'DEMOD   '           / The type of data stored to disk
END_AZD =              219.183 / Azimuth at end of observation (deg)
END_EL  =                   80 / Elevation of last SKYDIP point (deg)
END_ELD =              79.9896 / Elevation at end of observation
EQUINOX =                 2000 / Equinox of mean coordinate system
EXPOSED =                    5 / Exposure per pixel (seconds)
EXP_NO  =                    1 / Exposure number at end of observation
EXP_TIME=                  0.5 / Exposure time for each basic measurement (sec)
E_PER_I =                    1 / Number of exposures per integration
FILTER  = '450N:850N'          / Filters used
FOCUS_SH=                   -1 / Shift between focus measurements (mm)
GAIN    =                    1 / Programmable gain
HSTEND  = '20:05:49.00131'     / HST at end of observation
HSTSTART= '20:00:56.00281'     / HST at start of observation
HUMEND  =                   15 / Humidity (%) at end of observation
HUMSTART=                   15 / Humidity (%) at start of observation
INSTRUME= 'SCUBA   '           / Name of instrument used
INT_NO  =                    1 / Integration number at end of observation
JIGL_CNT=                   -1 / Number of offsets in jiggle pattern
JIGL_NAM= 'not used'           / File containing jiggle offsets
J_PER_S =                   -1 / Number of jiggles per switch position
J_REPEAT=                   -1 / No. jiggle pattern repeats in a switch
LAT     = 'not used'           / Object latitude
LAT-OBS =        19.8258323669 / Latitude of observatory (degrees)
LAT2    = 'not used'           / Object latitude at MJD2
LOCL_CRD= 'no      '           / Local offset coordinate system
LONG    = '+219:11:26.64'      / Object longitude
LONG-OBS=        204.520278931 / East longitude of observatory (degrees)
LONG2   = 'not used'           / Object Longitude at MJD2
MAP_HGHT=                   -1 / Height of rectangle to be mapped (arcsec)
MAP_PA  =                   -1 / P.A. of map vertical, +ve towards +ve long
MAP_WDTH=                   -1 / Width of rectangle to be mapped (arcsec)
MAP_X   =                   -1 / Map X offset from telescope centre (arcsec)
MAP_Y   =                   -1 / Map Y offset from telescope centre (arcsec)
MAX_EL  =                   80 / Max elevation of sky-dip (deg)
MEANDEC =            -17.93834 / -17:56:18.01437 = approx. mean Dec. (deg)
MEANRA  =             222.1444 / 222:08:39.76318 = approx. mean R.A. (deg)
MEAS_NO =                   10 / Measurement number at end of observation
MIN_EL  =                   15 / Min elevation of sky-dip (deg)
MJD1    =                   -1 / Modified Julian day planet at RA,DEC
MJD2    =                   -1 / Modified Julian day planet at RA2,DEC2
MODE    = 'SKYDIP  '           / The type of observation
N_INT   =                   10 / No. integrations in the observation
N_MEASUR=                   10 / No. measurements in the observation
OBJECT  = 'not used'           / Name of object
OBJ_TYPE= 'not used'           / Type of object
OBSDEF  = 'ss:odfsxskydip_850.obs_193300' / The observation definition file
OBSERVER= 'jmk     '           / The name of the observer
PROJ_ID = 'SCUBA   '           / The project identification
RUN     =                   26 / Run number of observation
SAM_CRDS= 'no      '           / Coordinatesystem of sampling mesh
SAM_DX  =                   -1 / Sample spacing along scan direction (arcsec)
SAM_DY  =                   -1 / Sample spacing perp. to scan (arcsec)
SAM_MODE= 'not used'           / Sampling method
SAM_PA  =                   -1 / Scan P.A. rel. to lat. line; 0=lat, 90=long
SCAN_REV=                    F / .TRUE. if alternate scans reverse direction
SPK_NSIG=                   -1 / N sigmas from fit of spike threshold
SPK_RMVL=                    F / Automatic spike removal
SPK_WDTH=                   -1 / Assumed width of spike
START_EL=                   15 / Elevation of first SKYDIP point (deg)
STATE   = 'Terminating         :   RESET_DATA_SIZE' / SCUCD state
STEND   = '16:49:09.149323'    / ST at end of observation
STRT_AZD=              219.174 / Azimuth at observation start (deg)
STRT_ELD=              14.9868 / Elevation at observation start (deg)
STSTART = '16:44:15.34744'     / ST at start of observation
SWTCH_MD= 'not     '           / Switch mode of observation
SWTCH_NO=                    1 / Switch number at end of observation
S_PER_E =                    1 / Number of switch positions per exposure
TELESCOP= 'JCMT    '           / Name of telescope
TEL_OPER= 'kkp     '           / Telescope operator
UTDATE  = '1999:8:8'           / UT date of observation
UTEND   = '6:05:48.9996'       / UT at end of observation
UTSTART = '6:00:55.99937'      / UT at start of observation
VERSION =                  1.1 / SCUCD version
ALIGN_DX=             0.027268 / SMU tables X axis alignment offset
ALIGN_DY=             0.482489 / SMU tables Y axis alignment offset
ALIGN_X =             -0.96279 / SMU tables X axis
ALIGN_Y =              3.79108 / SMU tables Y axis
AZ_ERR  =                    0 / Error in the telescope azimuth
CHOPPING=                    F / SMU Chopper chopping state
EL_ERR  =             0.154495 / Error in the telescope elevation
FOCUS_DZ=            -0.361142 / SMU tables Z axis focus offset
FOCUS_Z =             -17.2453 / SMU tables Z axis
SEEING  =                0.525 / SAO atmospheric seeing
SEE_DATE= '9908061715'         / Date and time of SAO seeing
TAU_225 =                0.066 / CSO tau
TAU_DATE= '9908080555'         / Date and time of CSO tau
TAU_RMS =              5.0E-03 / CSO tau rms
UAZ     =            -0.528088 / User azimuth pointing offset
UEL     =              4.83289 / User elevation pointing offset
UT_DATE = ' 8 Aug 1999'        / UT date at start of observation
BAD_LIM =                   32 / No. spikes before quality set bad
CALIB_LG=                   -1 / Lag of internal calibrator in samples
CALIB_PD=                   -1 / Period of internal calibrator in samples
CHOP_LG =                    0 / Chop lag in samples
CHOP_PD =             64.03689 / Chop period in samples
CNTR_DU3=                    0 / Nasmyth dU3 coord of instrument centre
CNTR_DU4=                    0 / Nasmyth dU4 coord of instrument centre
ETATEL_1=                 0.75 / Transmission of telescope
ETATEL_2=                  0.9 / Transmission of telescope
ETATEL_3=                   -1 / Transmission of telescope
ETATEL_4=                   -1 / Transmission of telescope
ETATEL_5=                   -1 / Transmission of telescope
FILT_1  = '450     '           / Filter name
FILT_2  = '850     '           / Filter name
FILT_3  = 'not used'           / Filter name
FILT_4  = 'not used'           / Filter name
FILT_5  = 'not used'           / Filter name
FLAT    = 'jcmtdata_dir:lwswphot.dat' / Name of flat-field file
JIG_DSCD=                   -1 / No. samples discarded after jiggle movement
L_GD_BOL= 'not used'           / Bol. to whose value LW guard ring is set
L_GUARD =                    F / Long wave guard ring on or off
MEAS_BOL= 'not used'           / Bolometers  actually measured in observation
N_BOLS  =                    2 / Number of bolometers selected
N_SUBS  =                    2 / Number of sub-instruments used
PHOT_BBF= 'not_used       LL,C14,NULL' / The bolometers on the source
PRE_DSCD=                    0 / No. of samples discarded before chop movement
PST_DSCD=                    0 / No. samples discarded after chop movement
REBIN   = 'LINEAR  '           / Rebinning method used by SCUIP
REF_ADC =                   -1 / A/D card of FLATFIELD reference bolometer
REF_CHAN=                   -1 / Channel of FLATFIELD reference bolometer
SAM_TIME=                  122 / A/D sample period in ticks (64musec)
SIMULATE=                    F / True if data is simulated
SKY     = 'jcmtdata_dir:skydip_startup.dat' / Name of sky opacities file
SUB_1   = 'SHORT   '           / SCUBA instrument being used
SUB_2   = 'LONG    '           / SCUBA instrument being used
SUB_3   = 'not used'           / SCUBA instrument being used
SUB_4   = 'not used'           / SCUBA instrument being used
SUB_5   = 'not used'           / SCUBA instrument being used
S_GD_BOL= 'not used'           / Bol. to whose value SW guard ring is set
S_GUARD =                    F / Short wave guard ring on or off
TAUZ_1  =                   -1 / Zenith sky optical depth
TAUZ_2  =                   -1 / Zenith sky optical depth
TAUZ_3  =                   -1 / Zenith sky optical depth
TAUZ_4  =                   -1 / Zenith sky optical depth
TAUZ_5  =                   -1 / Zenith sky optical depth
T_AMB   =             278.6532 / The ambient air temperature (K)
T_COLD_1=                  120 / Effective temperature of cold load (K)
T_COLD_2=                  100 / Effective temperature of cold load (K)
T_COLD_3=                   -1 / Effective temperature of cold load (K)
T_COLD_4=                   -1 / Effective temperature of cold load (K)
T_COLD_5=                   -1 / Effective temperature of cold load (K)
T_HOT   =                282.6 / The temperature of the hot load (K)
T_TEL   =             282.2908 / The temperature of the telescope
USE_CAL =                    F / .TRUE. if dividing chop by cal before rebin
WAVE_1  =                  442 / Wavelength of map (microns)
WAVE_2  =                  862 / Wavelength of map (microns)
WAVE_3  =                    0 / Wavelength of map (microns)
WAVE_4  =                    0 / Wavelength of map (microns)
WAVE_5  =                    0 / Wavelength of map (microns)
END