The main header, or HDU1, typically contains most of the information about
the file, while the headers for the extensions usually give
additional information about the data in each extension. The main headers are
parsed into sections, and all science data files (RAW, CAL, IDF, ALL, ANO, and NVO)
contain the same sections. However, for the RAW images, not all
of the fields are populated. Several of the ancillary files
contain similar information. The following sections describe these
standard header sections.
This chapter contains general information useful to the "Advanced" and "Intermediate" user. Its contents are not, however, of immediate relevance to the "Casual" user.
DATA DESCRIPTION KEYWORDS: This set of
keywords is fairly self-explanatory. For exposure level files,
OBS_STAT is replaced with EXP_STAT.
DATA DESCRIPTION KEYWORDS
TELESCOP= 'FUSE ' / Telescope used to acquire data
INSTRUME= 'FUV ' / Instrument in use (one of FUV, FESA, or FESB)
ROOTNAME= 'A1330147002 ' / Rootname of the observation set (ppppttooeee)
FILENAME= 'A13301470021bsic4ttagfcal.fit' / Name of file
FILETYPE= 'CALIBRATED EXTRACTED SPECTRUM' / Type of data found in data file
EXP_STAT= 0 / Science data processing status (0=good)
PROPOSAL INFORMATION: This section is populated from the Mission Planning Database (MPDB).
PROPOSAL INFORMATION
PRGRM_ID= 'A133 ' / Program ID from data header
TARG_ID = '01 ' / Target ID from data header
SCOBS_ID= '47 ' / Observation ID from data header
EXP_ID = '002 ' / Exposure ID from data header
OBS_ID = '47 ' / Observation ID from proposal database
PR_INV_L= 'Fullerton ' / Last name of principal investigator
PR_INV_F= 'Alex ' / First name of principal investigator
TARGET INFORMATION: These keywords are also populated from the MPDB and are not measured quantities. The expected fluxes and count rates come from the Phase 2 Proposal form submitted by the observer. A key to the numerical Object Classes are given in Section 8.4.5.
TARGET INFORMATION
TARGNAME= 'SK-67D166 ' / Target name on proposal
RA_TARG = 82.934625 / [deg] Right ascension of the target (J2000)
DEC_TARG= -67.6335 / [deg] Declination of the target (J2000)
APER_PA = 23.518158 / [deg] Position angle of Y axis (E of N)
EQUINOX = 2000.0 / Equinox of celestial coordinate system
ELAT = -8.705045834317E+01 / [deg] Ecliptic latitude
ELONG = 3.354528613035E+02 / [deg] Ecliptic longitude
GLAT = -3.248583704098E+01 / [deg] Galactic latitude
GLONG = 2.778388799536E+02 / [deg] Galactic longitude
OBJCLASS= 13 / Object class (modified IUE classification)
SP_TYPE = 'O4If+ ' / MK spectral type and luminosity class (or other
SRC_TYPE= 'PC ' / [P]oint or [E]xtended, [C]ontinuum, [E]mission
VMAG = 12.27 / Target V magnitude
EBV = 0.1 / Color excess E(B-V)
Z = 0.0 / Redshift
EFLX_950= 1.9E-12 / Expected flux at 950 A
EFLX1050= 2.7E-12 / Expected flux at 1050 A
EFLX1150= 2.6E-12 / Expected flux at 1150 A
HIGH_PM = 'F ' / High proper motion target (T or F)
MOV_TARG= 'F ' / [F]ixed or [M]oving target
PCNTRATE= 1592.9 / Expected count rate (sum of all channels)
SUMMARY EXPOSURE INFORMATION: This section contains the date and time of the observation, including the exposure start and end time, and the computed exposure time. Exposure start and end times are expressed in Modified Julian Date (MJD = JD-2400000.5). The EXPENDC keyword indicates the reason for the termination of the exposure - entry into South Atlantic Anomaly (SAA), occultation (OCC), end of night (NGHT), or the natural end of exposure (ENDE) or end of observation (ENDO). The Sun and Moon angles, and the minimum pointing angle above the Earth limb are computed by the calibration software, and are therefore 0 in the raw data files. For TTAG data, the calibration software also screens photon address data, and ignores bad data taken in, for instance, the SAA. There are a number of keywords reporting the actions taken by this screening step, and are shown below. The meanings of these codes are summarized in Table 4.10, 4.11, and 4.12 of Section 4.2.1.3. If data are screened out, then EXPTIME will be smaller than RAWTIME in the IDF and the calibrated files.
SUMMARY EXPOSURE INFORMATION
DATEOBS = '2000-10-12' / UT date of start of exposure (yyyy-mm-dd)
TIMEOBS = '14:38:30' / UT start time of exposure (hh:mm:ss)
EXPSTART= 5.182961006944E+04 / Exposure start time (Modified Julian Date)
EXPEND = 5.182962262750E+04 / Exposure end time (Modified Julian Date)
EXPTIME = 1085. / [s] Total time after screening
EXPENDC = 'ENDO ' / End condition (ENDO; SAA; OCC; NGHT; ENDE)
NEVENTS = 421399 / Number of events in raw data file
RAWTIME = 1.085015625000E+03 / [s] Exposure duration of raw data file
PLANTIME= 1020 / [s] Planned exposure time
SUNANGLE= 92.1169468703347 / [deg] Angle between sun and Z axis
MOONANGL= 83.0809764100487 / [deg] Angle between moon and Z axis
POLEANGL= 160.545069830942 / [deg] Angle between orbit pole and Z axis
GEO_LONG= 164.355774107397 / [deg] Geocentric longitude
GEO_LAT = 24.3003425210518 / [deg] Geocentric latitude
MAG_LAT = 30.5899872994262 / [deg] Geomagnetic latitude
MIN_LIMB= 11.9518247749345 / [deg] Minimum angle above Earth limb
NBADEVNT= 10910 / Number of events deleted in screening
NBADPHA = 919 / Number of events deleted in PHA screening
EXP_BAD = 0 / [s] Time lost to screening
EXP_BRST= 0 / [s] Time lost to event bursts
EXP_HV = 0 / [s] Time lost to low voltage/FIFO overflow
EXP_JITR= 0 / [s] Time lost to jitter
EXP_LIM = 0 / [s] Time with low limb angle
EXP_SAA = 0 / [s] Time while in SAA
EXPNIGHT= 1085 / [s] Night time after screening
V_GEOCEN= 2.38573645263126 / [km/s] Observed to geocentric velocity
V_HELIO = -1.08708418297615 / [km/s] Geocentric to heliocentric velocity
V_LSRDYN= -12.7521820068359 / [km/s] Heliocentric to dynamical LSR
V_LSRSTD= -15.775110244751 / [km/s] Heliocentric to standard solar LSR
Geocentric and helocentric conversions are applied by the
CALFUSE calibration pipeline. LSR conversion is not.
SCIENCE INSTRUMENT CONFIGURATION: These keywords contain planned as well as telemetered values for the instrument configuration. Most of the keywords shown below are self-explanatory. For the detector mask, DET_MASK, AIC1 is an open mask, i.e., none of the photon events are masked out. The focal plane assembly (FPA) X and Z positions from the telemetry are recorded in the header keywords. Note that the FES_FILT keyword is always set to CLR. The mirror focus MIR*FOC keywords are populated only for bright object defocus test exposures.
SCIENCE INSTRUMENT CONFIGURATION
INSTMODE= 'TTAG ' / Instrument mode (TTAG or HIST)
DETECTOR= '1B ' / Detector for data in this file (1A, 1B, 2A, 2B)
APERTURE= 'LWRS ' / Planned target aperture: HIRS, MDRS, LWRS, RFPT
BRIT_OBJ= 'NO ' / Special configuration for bright-object obs
APER_ACT= 'LWRS_SIC' / Extracted aperture in this file
DET_MASK= 'AIC1 ' / Detector mask used
NUM_APS = 1 / Number of apertures in use in the observation
INITBINX= 1 / Initial binning in X coordinate
INITBINY= 1 / Initial binning in Y coordinate
SPECBINX= 1 / Current binning in X coordinate
SPECBINY= 1 / Current binning in Y coordinate
SIA_TBL = ' ' / SIA Table name
NUM_HIST= 0 / Number of histograms in the observation
INT_CAL = ' ' / Internal Calibration (STIM, NONE)
FPSPLIT = 0 / Number of FP Split positions
FPASXPOS= 140.145 / [microns] FPA SiC X position
FPALXPOS= 116.107 / [microns] FPA LiF X position
FPASZPOS= -98.9776 / [microns] FPA SiC Z position
FPALZPOS= -34.4119 / [microns] FPA LiF Z position
MIRL1FOC= 0.000000 / [microns] LiF 1 mirror position
MIRL2FOC= 0.000000 / [microns] LiF 2 mirror position
MIRS1FOC= 0.000000 / [microns] SiC 1 mirror position
MIRS2FOC= 0.000000 / [microns] SiC 2 mirror position
TTPERIOD= 1.0 / [s] Time marker insertion period
ENGSNAPT= 300 / [s] Engineering snapshot period
TACQSEQ = 'ACQ-T-NOPKUP ' / Target acquisition sequence
ROLLOFF = 0.0 / [Deg] Roll offset
FES_BIN = 1 / FES binning factor (1;2;4;8)
FES_FILT= 'CLR ' / FES filter wheel position: CLR=Clear, COL=Color
FES_TPOS= 'OUT ' / FES target position: IN or OUT
DETECTOR HV BIAS RANGES: These keywords list the minimum and maximum high voltage level for all segments during the exposure. The minimum and maximum for a given segment should normally be the same. The nominal high voltage levels were adjusted periodically during the mission; see Table 7.4.
DETECTOR HV BIAS RANGES
DET1HVAL= 128 / Det1 MCP A HV bias minimum setting
DET1HVAH= 128 / Det1 MCP A HV bias maximum setting
DET1HVBL= 128 / Det1 MCP B HV bias minimum setting
DET1HVBH= 128 / Det1 MCP B HV bias maximum setting
DET2HVAL= 128 / Det2 MCP A HV bias minimum setting
DET2HVAH= 128 / Det2 MCP A HV bias maximum setting
DET2HVBL= 101 / Det2 MCP B HV bias minimum setting
DET2HVBH= 101 / Det2 MCP B HV bias maximum setting
HV_FLAG = 4 / Detector voltage full throughout exposure
ORBITAL EPHEMERIS: These keywords contain the Keplerian elements for the FUSE orbital ephemeris. Together with the time of observation, these values can be used to calculate where the satellite was in its orbit (although much of this information is already in the timeline table in the IDF files). The calibration software, for instance, uses these values to compute the Doppler correction to apply as it produces the calibrated data.
ORBITAL EPHEMERIS
EPCHTIMD= 51829. / Epoch time of parameters whole day (MJD)
EPCHTIMF= 0.943173899999238 / Epoch time of parameters fraction of day (MJD)
INCLINAT= 24.9842 / [deg] Inclination
ECCENTRY= 0.0011377 / Eccentricity
MEANANOM= 238.2636 / [deg] Mean anomaly
ARGPERIG= 121.8967 / [deg] Argument of perigee
RASCASCN= 301.572 / [deg] RA of ascending node
SEMIMAJR= 7137.84084370588 / [km] Semi-major axis
MEANMOTN= 14.39635355 / [revs/day] Mean motion
FDM2COEF= 9.37E-06 / First time derivative of mean motion / 2
SDM6COEF= 0. / Second time derivative of mean motion / 6
DRAGCOEF= 0.00023849 / B star drag coefficient
PROPMODL= 'SGP4 ' / Propagation model
SCIENCE DATA PROCESSING STEPS: These keywords indicate which steps of the calibration pipeline have been applied to the data. All processing steps are set to a value of INITIAL in the raw data files. The first pipeline module sets them to either PERFORM or OMIT, depending on whether the corresponding calibration step is to be performed or not. Once a step is completed, its keyword is changed to a value of COMPLETE. If a pipeline module decides not to perform a step labeled PERFORM, it changes the keyword to SKIPPED. Thus, COMPLETE, OMIT, and SKIPPED are all valid keywords in extracted spectral files (see Dixon et al. (2007)).
SCIENCE DATA PROCESSING STEPS
INIT_COR= 'COMPLETE' / Initialize processing
DIGI_COR= 'COMPLETE' / Check digitizer values
ELEC_COR= 'COMPLETE' / Detector dead-time correction
IDS__COR= 'COMPLETE' / IDS dead-time correction
FIFO_COR= 'COMPLETE' / FIFO overflow correction
DEAD_COR= 'COMPLETE' / Apply all dead-time corrections
THRM_COR= 'COMPLETE' / Thermal distortion correction
RATE_COR= 'COMPLETE' / Count-rate Y distortion
TMXY_COR= 'COMPLETE' / Temporal X and Y corrections
GEOM_COR= 'COMPLETE' / Geometric distortion
PHAH_COR= 'OMIT ' / Assign pulse heights to HIST data
PHAX_COR= 'COMPLETE' / Low pulse-height X distortion (walk)
ACTV_COR= 'COMPLETE' / Define detector active region
LIMB_COR= 'COMPLETE' / Limb-angle screening
SAA__COR= 'COMPLETE' / SAA screening
VOLT_COR= 'COMPLETE' / Confirm detector voltage
BRST_COR= 'COMPLETE' / Screen for bursts
APER_COR= 'COMPLETE' / Screen for target out of aperture
UGTI_COR= 'COMPLETE' / Set user good-time intervals
FLAG_COR= 'COMPLETE' / Set individual photon flags
GTI__COR= 'COMPLETE' / Determine good-time intervals
TIME_COR= 'OMIT ' / Modify photon arrival times (HIST only)
AIRG_COR= 'COMPLETE' / Flag events in airglow regions
BPIX_COR= 'COMPLETE' / Flag events in bad-pixel regions
PHA__COR= 'COMPLETE' / Pulse-height screening
FIND_COR= 'COMPLETE' / Find spectra on detector
YMOT_COR= 'COMPLETE' / Track motion of Y centroid
GRAT_COR= 'COMPLETE' / Grating motion correction
FPA__COR= 'COMPLETE' / FPA offset correction
MIRR_COR= 'COMPLETE' / Mirror motion correction
JITR_COR= 'COMPLETE' / Satellite jitter correction
YCNT_COR= 'COMPLETE' / Y centroid of corrected data
CHID_COR= 'COMPLETE' / Final channel assignment
TCRT_COR= 'COMPLETE' / Calculate target count rate
ASTG_COR= 'COMPLETE' / Astigmatism correction
WAVE_COR= 'COMPLETE' / Assign wavelength to photons
DOPP_COR= 'COMPLETE' / Heliocentric reference frame
FLAT_COR= 'OMIT ' / Flat-field correction
FLUX_COR= 'COMPLETE' / Flux-calibrate each photon
COMB_COR= 'PERFORM ' / Generate observation-level spectrum
SCIENCE DATA PROCESSING CALIBRATION FILES: These keywords indicate the names of the SDP calibration files and the ancillary files used by the calibration software. Knowing these filenames is important if one is considering reprocessing the data. Since no flat field or worm corrections were applied to the data these fields always remain empty.
SCIENCE DATA PROCESSING CALIBRATION FILES
AEFF1CAL= 'aeff1b103.fit ' / Effective-area curve #1
AEFF2CAL= 'aeff1b104.fit ' / Effective-area curve #2
AIRG_CAL= 'airg1b004.fit ' / Geocoronal line locations
ASTG_CAL= 'astg1b011.fit ' / Astigmatism correction
BCHR_CAL= 'bchr1b003.fit ' / Background characteristics
BKGD_CAL= 'bkgd1b011.fit ' / Background/scattered-light model
BPM_CAL = 'A13301470021bttagfbpm.fit' / Bad-pixel map for this exposure
CHID_CAL= 'chid1b014.fit ' / Windows for spectral extraction
DIGI_CAL= 'digi001.fit ' / Reference file for digitizer values
ELEC_CAL= 'elec005.fit ' / Detector parameters
FLAT1CAL= ' ' / Flat-field correction #1
FLAT2CAL= ' ' / Flat-field correction #2
GEOM_CAL= 'geom1b016.fit ' / X and Y geometric corrections
GRAT_CAL= 'grat005.fit ' / Grating motions
HSKP_CAL= 'A1330147002hskpf.fit' / Housekeeping data
JITR_CAL= 'A1330147002jitrf.fit' / Spacecraft jitter data
MIRR_CAL= 'mirr002.fit ' / Mirror motions
PARM_CAL= 'parm1b015.fit ' / Master parameter file
PHAH_CAL= 'phah1b001.fit ' / Pulse height map for HIST data
PHAX_CAL= 'phax1b005.fit ' / Low-pulse-height X distortion
QUAL_CAL= 'qual1b020.fit ' / Quality flag (bad pixel) map
RATE_CAL= 'rate1b002.fit ' / Y stretch with count rate
SAAC_CAL= 'saac004.fit ' / SAA contours for data screening
SCRN_CAL= 'scrn1b015.fit ' / Parameters for data screening
SPEC_CAL= 'spec002.fit ' / Spectrograph parameters
STIM_CAL= 'stim1b001.fit ' / Default thermal drift parameters
TMXY_CAL= 'tmxy1b002.fit ' / Temporal X and Y corrections
VOLT_CAL= 'volt1b009.fit ' / Detector bias voltages and dates
WAVE_CAL= 'wave1b023.fit ' / Wavelength calibration
WGTS_CAL= 'wgts1b011.fit ' / Pixel weights for extraction
WORM1CAL= ' ' / Worm correction #1
WORM2CAL= ' ' / Worm correction #2
SCIENCE DATA PROCESSING KEYWORDS: This section collects other data which are relevant to the calibration. These keywords are populated by OPUS and/or by CalFUSE. Some of these keywords (e.g., limb angle; pulse height) reflect screening limits used when CalFUSE was executed (see The CalFUSE Page).
SCIENCE DATA PROCESSING KEYWORDS
OPUSVERS= '2.7 ' / FUSE OPUS version number
CF_VERS = '3.2.1 ' / CALFUSE pipeline version number
HKEXISTS= 'yes ' / Housekeeping data file exists
DAYNIGHT= 'BOTH ' / Use only DAY, NIGHT, or BOTH
BRITLIMB= 15. / [deg] Bright limb avoidance angle
DARKLIMB= 10. / [deg] Dark limb avoidance angle
ORBPERID= 5998. / [s] Estimate of orbital period
PHALOW = 2 / Pulse height screening low limit
PHAHIGH = 24 / Pulse height screening high limit
OPT_EXTR= 10 / Number of optimal extraction iterations
STIM_L_X= 256.5767 / X centroid of left stim pulse
STIM_L_Y= 749.4218 / Y centroid of left stim pulse
STIM_R_X= 16144.58 / X centroid of right stim pulse
STIM_R_Y= 772.1562 / Y centroid of right stim pulse
FPADXLIF= -0.1579872 / [pixels] Correction for FPA position (LIF)
FPADXSIC= -5.317671 / [pixels] Correction for FPA position (SIC)
WPC = 0.013 / [A] Wavelength increment per pixel
W0 = 900. / [A] Wavelength of first pixel
DET_DEAD= 1.005887 / Mean detector deadtime correction factor
IDS_DEAD= 1. / Mean IDS deadtime correction factor
TOT_DEAD= 1.005887 / TOTAL deadtime correction factor
MEASURED SPECTRAL CENTROIDS: This section gives the position of the centroids of the spectra determined by CalFUSE. The quality keyword is set to HIGH if the centroid is measured from the target spectrum, MEDIUM if it is measured from airglow features, and LOW if it is taken from a reference file (see Dixon et al. (2007) for more details).
MEASURED SPECTRAL CENTROIDS
YCENT1 = 688.1578 / [pixels] Y centroid of LIF HIRS spectrum
YCENT2 = 809.5578 / [pixels] Y centroid of LIF MDRS spectrum
YCENT3 = 558.6619 / [pixels] Y centroid of LIF LWRS spectrum
YCENT5 = 193.9905 / [pixels] Y centroid of SIC HIRS spectrum
YCENT6 = 321.1906 / [pixels] Y centroid of SIC MDRS spectrum
YCENT7 = 60.5411 / [pixels] Y centroid of SIC LWRS spectrum
YQUAL1 = 'MEDIUM ' / Quality of Y centroid value (LIF HIRS)
YQUAL2 = 'MEDIUM ' / Quality of Y centroid value (LIF MDRS)
YQUAL3 = 'HIGH ' / Quality of Y centroid value (LIF LWRS)
YQUAL5 = 'MEDIUM ' / Quality of Y centroid value (SIC HIRS)
YQUAL6 = 'MEDIUM ' / Quality of Y centroid value (SIC MDRS)
YQUAL7 = 'HIGH ' / Quality of Y centroid value (SIC LWRS)
BACKGROUND SAMPLE REGIONS: This section provides the details of the regions on the detectors used to determine the backgrounds used by CalFUSE (see Chapter 7).
BACKGROUND SAMPLE REGIONS
BKGD_NUM= 3 / Number of background regions specified
BKG_MIN0= 160 / [pixels] bkgd sample region 0 - lower limit
BKG_MIN1= 665 / [pixels] bkgd sample region 1 - lower limit
BKG_MIN2= 891 / [pixels] bkgd sample region 2 - lower limit
BKG_MIN3= 0 / [pixels] bkgd sample region 3 - lower limit
BKG_MIN4= 0 / [pixels] bkgd sample region 4 - lower limit
BKG_MIN5= 0 / [pixels] bkgd sample region 5 - lower limit
BKG_MIN6= 0 / [pixels] bkgd sample region 6 - lower limit
BKG_MIN7= 0 / [pixels] bkgd sample region 7 - lower limit
BKG_MAX0= 450 / [pixels] bkgd sample region 0 - upper limit
BKG_MAX1= 890 / [pixels] bkgd sample region 1 - upper limit
BKG_MAX2= 930 / [pixels] bkgd sample region 2 - upper limit
BKG_MAX3= 0 / [pixels] bkgd sample region 3 - upper limit
BKG_MAX4= 0 / [pixels] bkgd sample region 4 - upper limit
BKG_MAX5= 0 / [pixels] bkgd sample region 5 - upper limit
BKG_MAX6= 0 / [pixels] bkgd sample region 6 - upper limit
BKG_MAX7= 0 / [pixels] bkgd sample region 7 - upper limit
ENGINEERING KEYWORDS: A fair amount of the detector engineering snapshot data (engineering telemetry) is included in the FITS headers. The values included are shown below. Except for the Active Image Counters, only those values from the relevant detector segment are inserted into the header. The example keywords below are for segment 1B. For a description of the counters and masks, see the Instrument Handbook (2009). The counter information is used by CalFUSE (see Dixon et al. (2007)).
ENGINEERING KEYWORDS
THERMCON= 'ON ' / Thermal control flag
FESSRC = 'FES A ' / Source of FES dump data
FESCENT = 'FES A ' / Source of FES centroid data
GMODE = 'IDENTIFIED_TRACKING ' / Guidance mode
TRACKON = 'OFF ' / Moving target tracking on
ATCMDATT= 'AT COMMANDED ATTITUD ' / At commanded attitude
Segment 1B Counters
C1BSIC_B= 14101192 / SIC counter at beginning of integration
C1BSIC_E= 14175036 / SIC counter at end of integration
C1BLIF_B= 11704586 / LIF counter at beginning of integration
C1BLIF_E= 12032091 / LIF counter at end of integration
C1BDE_B = 13969564 / Digitized events counter at beginning of integr
C1BDE_E = 14391379 / Digitized events counter at end of integration
C1BAS_B = 15180958 / Autonomous shutdown (SAA) counter at beginning
C1BAS_E = 15182787 / Autonomous shutdown (SAA) counter at end of int
C1BFE_B = 3527277 / Fast event counter at beginning of integration
C1BFE_E = 3954788 / Fast event counter at end of integration
C1BFE_CR= 394.019348 / Count rate from fast event counter
Active Image Counters
CTIME_B = 5.182961006944E+04 / [MJD] Time of first engineering snapshot
CTIME_E = 5.182962262731E+04 / [MJD] Time of last engineering snapshot
C1AAI_B = 10760595 / Seg 1A at beginning
C1AAI_E = 11259319 / Seg 1A at end of integration
C1BAI_B = 13894835 / Seg 1B at beginning
C1BAI_E = 14316651 / Seg 1B at end of integration
C2AAI_B = 1067178 / Seg 2A at beginning
C2AAI_E = 1679155 / Seg 2A at end of integration
C2BAI_B = 2067772 / Seg 2B at beginning
C2BAI_E = 2341339 / Seg 2B at end of integration
Detector 1 parameters
DET1ETMP= 25.9103 / DET1 electronics temperature
DET1PTMP= 18.1937 / DET1 Baseplate temperature
DET1ASCL= 17.0 / DET1 segment A Time (X) image scale factor
DET1BSCL= 91.0 / DET1 segment B Time (X) image scale factor
DET1AXOF= 183.0 / DET1 segment A Time (X) image position offset
DET1BXOF= 107.0 / DET1 segment B Time (X) image position offset
DET1TEMP= 18.4255 / DET1 Detector temperature
DET1HVMT= 24.5318 / DET1 High Voltage Module temperature
DET1HVFT= 20.9761 / DET1 High Voltage Filter temperature
DET1AMAT= 26.3947 / DET1 segment A Amplifier temperature
DET1AMBT= 26.3947 / DET1 segment B Amplifier temperature
DET1TDAT= 21.386000 / DET1 TDC A temperature
DET1TDBT= 21.792 / DET1 TDC B temperature
DET1HVA = 57.0 / DET1 MCP A Bias Current
DET1HVB = 48.0 / DET1 MCP B Bias Current
DET1AUCT= 227.0 / DET1 TDC-A Upper Charge Threshold setting
DET1BUCT= 228.0 / DET1 TDC-B Upper Charge Threshold setting
DET1ABWK= 165.0 / DET1 TDC-A Begin CFD Walk setting
DET1BBWK= 139.0 / DET1 TDC-B Begin CFD Walk setting
DET1AEWK= 165.0 / DET1 TDC-A End CFD Walk setting
DET1BEWK= 125.0 / DET1 TDC-B End CFD Walk setting
DET1ABSL= 227.0 / DET1 TDC-A charge Baseline threshold setting
DET1BBSL= 228.0 / DET1 TDC-B charge Baseline threshold setting
DET1ALCT= 7.0 / DET1 TDC-A Lower Charge Threshold setting
DET1BLCT= 6.0 / DET1 TDC-B Lower Charge Threshold setting
DET1ALTT= 169.0 / DET1 TDC-A Lower Time Threshold setting
DET1BLTT= 143.0 / DET1 TDC-B Lower Time Threshold setting
DET1HVGR= 1.0 / DET1 Grid High Voltage Status
DET1HVPW= 1.0 / DET1 Bias High Voltage Status
DET1STIM= 'OFF ' / DET1 Stimulation Lamp Status
ARCHIVE SEARCH KEYWORDS: Finally, keywords used by the archive, and those necessary to associate the exposures that make up an observation are included.
ARCHIVE SEARCH KEYWORDS
BANDWID = 99.99597 / [Angstroms] Bandwidth of the data
CENTRWV = 949.998 / [Angstroms] Central wavelength of the data
WAVEMIN = 900. / [Angstroms] Minimum wavelength of the data
WAVEMAX = 999.996 / [Angstroms] Maximum wavelength of the data
PLATESC = 1.163 / [arcsec/pixel] Plate scale
ASSOCIATION KEYWORDS
ASN_ID = 'A1330147000 ' / Unique identifier assigned to association
ASN_TAB = 'A1330147000asn.fit ' / Name of the association table
ASN_MTYP= 'EXPOSURE ' / Role of the exposure in the association
Subsets of the DATA DESCRIPTION keywords, PROPOSAL INFORMATION keywords, and TARGET INFORMATION keywords are also included in the housekeeping and jitter file headers. In addition, their headers contain unique keywords which are described in this section.
Housekeeping Keywords:
The HDU1 header for the housekeeping files contains some of the
keywords defined above plus a set of engineering housekeeping time
keywords (shown below). These specify the start time of the engineering
telemetry contained in the file, and are measured quantities. The
TIME_ENG keyword value is normally about one-half to one minute before
the actual start time of the science exposure.
ENGINEERING HOUSEKEEPING TIME
HSKPVERS= '3.2 ' / Housekeeping version number
DATE_ENG= '2000-09-27 ' / start date (yyyy-mm-dd)
TIME_ENG= '11:03:16 ' / start time (hh:mm:ss)
The HDU2 headers of the housekeeping files simply contain definitions of the housekeeping variables listed in Appendix D, so they are not repeated here.
Jitter Keywords:
The HDU1 headers for the jitter files contain the engineering
housekeeping time keywords described above, as well as a unique set of
jitter keywords. The jitter data are computed from the housekeeping data.
Most of the jitter keywords reflect the results of that analysis, and are
intended as indicators of the overall quality of the pointing during the
science exposure.
JITTER KEYWORDS
JIT_STAT= 0 / Status of jitter data is good
JIT_VERS= '3.5 ' / cf_jitter version number
QREF_SRC= 'TELEMETRY' / Source of reference quaternion
QREF_0 = -0.0168658437405577 / Reference quaternion
QREF_1 = 0.318041029256893
QREF_2 = 0.908345046651746
QREF_3 = 0.271062212872567
EXP_DUR = 668. / [s] duration of jitter data
KNOWNTRK= 1. / fraction of exp in known track
ACSTRK = 0. / fraction of exp in ACS track
NOGDEINF= 0. / fraction of exp with no guiding info
NGS_USED= 6 / number of guide stars used
GS1_USED= 1. / fraction of exp using known guide star 1
GS2_USED= 1. / fraction of exp using known guide star 2
GS3_USED= 1. / fraction of exp using known guide star 3
GS4_USED= 1. / fraction of exp using known guide star 4
GS5_USED= 1. / fraction of exp using known guide star 5
GS6_USED= 1. / fraction of exp using known guide star 6
KTRKFINE= 1. / exp fraction, err < 15 arcsec, known stars
ATRKFINE= 0. / exp fraction, err < 15 arcsec, ACS
TOTLFINE= 1. / exp fraction, err < 15 arcsec, total
GS_INUSE= 1. / fraction of exp tracking on guide stars
SLEWFLG = -1 / Slew commanded during obs (if > 0)
SLEWTIME= 0 / time spent slewing (sec)
POSAVG_X= 0.02662656 / [arcsec] mean DX during known track
POSAVG_Y= -0.01711245 / [arcsec] mean DY during known track
X_JITTER= 0.326723 / [arcsec] sigma of DX during known track
Y_JITTER= 0.136007 / [arcsec] sigma of DY during known track
XJIT_15 = 0.326723 / [arcsec] sigma of DX for err < 15 arcsec
YJIT_15 = 0.136007 / [arcsec] sigma of DY for err < 15 arcsec
X_JITLRG= 0.03892216 / frac of DX more than 2-sigma from POSAVE_X
Y_JITLRG= 0.05239521 / frac of DY more than 2-sigma from POSAVE_Y