The Copernicus FITS file header


SIMPLE  =                    T / file does conform to FITS standard
BITPIX  =                  -32 / number of bits per data pixel
NAXIS   =                    0 / number of data axes
COMMENT   FITS (Flexible Image Transport System) format defined in Astronomy and
COMMENT   Astrophysics Supplement Series v44/p363, v44/p371, v73/p359, v73/p365.
COMMENT   Contact the NASA Science Office of Standards and Technology for the
COMMENT   FITS Definition document #100 and other FITS information.
ORIGIN  = 'HEASARC/GSFC/NASA'  / origin of FITS file
DATE    = '1999-05-11T12:20:59' / file creation date (YYYY-MM-DDThh:mm:ss UTC)
TELESCOP= 'COPERNICUS'         / Telescope (mission) name
INSTRUME= 'UCLXE   '           / Instrument name
DATE-OBS= '02/02/74'           / Start date of observation (dd/mm/yy)
TIME-OBS= '07:03:28'           / Start time of observation (hh:mm:ss)
DATE-END= '02/02/74'           / End date of observation (dd/mm/yy)
TIME-END= '08:58:50'           / End time of observation (hh:mm:ss)
OBJECT  = 'X PERSEI'           / Original Copernicus source designation
CATID1  = 'X PER   '           / Source designation match, NONE if null
IDHEADER= 'HEAD    '           / Data Type
COMMENT   Catalog name : SIMBAD
RA_OBJ  =       5.80628500E+01 / Right Ascension from match, -999.0 if null
DEC_OBJ =       3.09001870E+01 / Declination from match, -999.0 if null
EQUINOX =               1950.0 / equinox of coordinate system
RADECSYS= 'FK4     '           / Coordinate system
CREATOR = 'copx2fits'          / s/w task which wrote this dataset
CHECKSUM= 'blj4ejg3bjg3bjg3'   / HDU checksum updated 1999-05-11T12:20:59
DATASUM = '         0'         / data unit checksum updated 1999-05-11T12:20:59
END

XTENSION= 'BINTABLE'           / binary table extension
BITPIX  =                    8 / 8-bit bytes
NAXIS   =                    2 / 2-dimensional binary table
NAXIS1  =                  208 / width of table in bytes
NAXIS2  =                   53 / number of rows in table
PCOUNT  =                    0 / size of special data area
GCOUNT  =                    1 / one data group (required keyword)
TFIELDS =                   45 / number of fields in each row
TTYPE1  = 'TIME    '           / Seconds since MJDREF
TFORM1  = 'D       '           / data format of field: 8-byte DOUBLE
TUNIT1  = 's       '           / physical unit of field
TTYPE2  = 'TDIFF   '           / Time difference between rows
TFORM2  = 'D       '           / data format of field: 8-byte DOUBLE
TUNIT2  = 's       '           / physical unit of field
TTYPE3  = 'HOURS   '           / UT hours of the data frame
TFORM3  = 'J       '           / data format of field: 4-byte INTEGER
TUNIT3  = 'h       '           / physical unit of field
TTYPE4  = 'MINUTES '           / UT minutes of the data frame
TFORM4  = 'J       '           / data format of field: 4-byte INTEGER
TUNIT4  = 'min     '           / physical unit of field
TTYPE5  = 'SECONDS '           / UT seconds of the data frame
TFORM5  = 'J       '           / data format of field: 4-byte INTEGER
TUNIT5  = 's       '           / physical unit of field
TTYPE6  = 'DAY     '           / Day of the year of the data frame
TFORM6  = 'J       '           / data format of field: 4-byte INTEGER
TUNIT6  = 'd       '           / physical unit of field
TTYPE7  = 'YEAR    '           / Year of the data frame
TFORM7  = 'J       '           / data format of field: 4-byte INTEGER
TUNIT7  = 'yr      '           / physical unit of field
TTYPE8  = 'ORBITADS'           / Orbital address
TFORM8  = 'J       '           / data format of field: 4-byte INTEGER
TTYPE9  = 'OBS_CNSTR'          / Code the observational constraints
TFORM9  = 'J       '           / data format of field: 4-byte INTEGER
TTYPE10 = 'TIME_ACPT'          / Time counter for dead-time
TFORM10 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE11 = 'CNT_1_3 '           / Counts in 1-3 A CPCounter detector
TFORM11 = 'J       '           / data format of field: 4-byte INTEGER
TUNIT11 = 'count   '           / physical unit of field
TTYPE12 = 'CNT_3_9 '           / Count in 3-9 A TPCounter detector
TFORM12 = 'J       '           / data format of field: 4-byte INTEGER
TUNIT12 = 'count   '           / physical unit of field
TTYPE13 = 'CNT_6_18'           / Count in 6-18 A TPCounter detector
TFORM13 = 'J       '           / data format of field: 4-byte INTEGER
TUNIT13 = 'count   '           / physical unit of field
TTYPE14 = 'CNT_CPM '           / Count in the channel photomultiplier
TFORM14 = 'J       '           / data format of field: 4-byte INTEGER
TUNIT14 = 'count   '           / physical unit of field
TTYPE15 = 'SHUTTER '           / Shutter flag : 0=bkg, 1=stellar
TFORM15 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE16 = 'PHA_DET '           / PHA discriminator for which detector
TFORM16 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE17 = 'PHA_CNT '           / Six channel spectrum
TFORM17 = '6J      '           / data format of field: 4-byte INTEGER
TUNIT17 = 'count   '           / physical unit of field
TTYPE18 = 'PHA_TOT '           / Total PHA count
TFORM18 = 'J       '           / data format of field: 4-byte INTEGER
TUNIT18 = 'count   '           / physical unit of field
TTYPE19 = 'GRD_1_3 '           / Guard Counts in the 1-3 A
TFORM19 = 'J       '           / data format of field: 4-byte INTEGER
TUNIT19 = 'count   '           / physical unit of field
TTYPE20 = 'GRD_3_9 '           / Guard Counts in the 3-9 A
TFORM20 = 'J       '           / data format of field: 4-byte INTEGER
TUNIT20 = 'count   '           / physical unit of field
TTYPE21 = 'GRD_6_18'           / Guard Counts in the 6-18 A
TFORM21 = 'J       '           / data format of field: 4-byte INTEGER
TUNIT21 = 'count   '           / physical unit of field
TTYPE22 = 'SEN_1_3 '           / Sensitivity flag in the 1-3 A
TFORM22 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE23 = 'SEN_3_9 '           / Sensitivity flag in the 3-9 A
TFORM23 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE24 = 'SEN_6_18'           / Sensitivity flag in the 6-18 A
TFORM24 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE25 = 'PSDS_1_3'           / Pulse shape discriminator speed
TFORM25 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE26 = 'PSDM_1_3'           / Pulse shape discriminator mode
TFORM26 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE27 = 'HTF_1_3 '           / High Tension flag 1-3 A
TFORM27 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE28 = 'HTF_3_9 '           / High tension flag 6-9 A
TFORM28 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE29 = 'HTF_6_18'           / High tension flag for 6-18 A
TFORM29 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE30 = 'HTF_CPM '           / High tension flag for CPM
TFORM30 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE31 = 'HEATFLAG'           / Experiment heater flag
TFORM31 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE32 = 'BKGDMODE'           / Background alternate flag
TFORM32 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE33 = 'LOWVLTFL'           / Low voltage (0=on 1=off)
TFORM33 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE34 = 'LOWVLTMD'           / Low voltage power supply (0=A, 1=B)
TFORM34 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE35 = 'IRIS    '           / Code size FOV (1=small 2=large 3=intermediate)
TFORM35 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE36 = 'FILTER  '           / Filter selected (value 1-4)
TFORM36 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE37 = 'ANTELGRP'           / Analog telemetry group (group B 1 = group A)
TFORM37 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE38 = 'OPMODE  '           / Operational mode 0=normal 1=calibration
TFORM38 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE39 = 'STYAXIS '           / Star tracker Y axis counter
TFORM39 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE40 = 'STZAXIS '           / Star tracker Z axis counter
TFORM40 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE41 = 'ANA_TEL1'           / Analog telemetry word 1
TFORM41 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE42 = 'ANA_TEL2'           / Analog telemetry word 2
TFORM42 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE43 = 'ANA_TEL3'           / Analog telemetry word 3
TFORM43 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE44 = 'ANA_TEL4'           / Analog telemetry word 4
TFORM44 = 'J       '           / data format of field: 4-byte INTEGER
TTYPE45 = 'ANA_TEL5'           / Analog telemetry word 5
TFORM45 = 'J       '           / data format of field: 4-byte INTEGER
EXTNAME = 'SPECTRA '           / name of this binary table extension
1CTYP17 = 'CHANNEL '           / Axis type
1CUNI17 = 'chan    '           / Physical Units of the Axis CTYP17
1CRVL17 =                    1 / Channel value for reference pixel
1CRPX17 =                    1 / Reference pixel
ORIGIN  = 'HEASARC/GSFC/NASA'  / Origin of FITS file
TELESCOP= 'COPERNICUS'         / Telescope (mission) name
INSTRUME= 'UCLXE   '           / Instrument name
HDUCLASS= 'OGIP    '           / Format conforms to OGIP standard
HDUCLAS1= 'TEMPORALDATA'       / Contains non-science data vs. time
HDUCLAS2= 'COMBINED'           / Contains HK and data
DATE-OBS= '02/02/74'           / Start date of observation (dd/mm/yy)
TIME-OBS= '07:03:28'           / Start time of observation (hh:mm:ss)
DATE-END= '02/02/74'           / End date of observation (dd/mm/yy)
TIME-END= '08:58:50'           / End time of observation (hh:mm:ss)
MJDREF  = 4.131600000000000E+04 / Reference time in MJD
TIMESYS = '1972 1 0 00:00:00'  / Ref. time in YYYY MM DD hh:mm:ss
TIMEREF = 'LOCAL   '           / Reference frame for the times
TASSIGN = 'SATELLITE'          / Place of time assignment
CLOCKAPP=                    F / True if clock correction applied
TIMEUNIT= 's       '           / Unit for TSTART,TSTOP,and TIMEZER
TSTART  = 6.603500800000000E+07 / Start time counted from TIMESYS
TSTOP   = 6.604193000000000E+07 / Stop time counted from TIMESYS
TELAPSE = 6.922000000000000E+03 / Elapsed time of observation
TIMEPIXR=                  0.0 / Time stamps refer to start of each pixel
TIMEDEL =               62.509 / Integration time in TIMEUNIT
OBS_MODE= 'POINTING'           / Observation mode
OBJECT  = 'X PERSEI'           / Original Copernicus source designation
CATID1  = 'X PER   '           / Source designation match, NONE if null
IDHEADER= 'HEAD    '           / Data Type
COMMENT   Catalog name : SIMBAD
RA_OBJ  =       5.80628500E+01 / Right Ascension from match, -999.0 if null
DEC_OBJ =       3.09001870E+01 / Declination from match, -999.0 if null
EQUINOX =               1950.0 / Equinox of coordinate system
RADECSYS= 'FK4     '           / Coordinate system
CREATOR = 'copx2fits'          / s/w task which wrote this dataset
TOTCN13 =                 2646 / Total 1 - 3 A detector counts
TOTCN39 =                  161 / Total 3 - 9 A detector counts
TOTCN618=                  116 / Total 6 - 18 A detector counts
TOTCNCPM=                    0 / Total CPM detector counts
AVECN13 =              49.9245 / Average 1 - 3 A detector counts
AVECN39 =               3.0377 / Average 3 - 9 A detector counts
AVECN618=               2.1887 / Average 6 - 18 A detector counts
AVECNCPM=               0.0000 / Average CPM detector counts
AVEGC13 =            1443.9623 / Average 1 - 3 A guard counts
AVEGC39 =            2311.0188 / Average 3 - 9 A guard counts
AVEGC618=            3726.3208 / Average 6 - 18 A guard counts
HISTORY   The UCL X-ray Experiment (UCLXE) package consisted of four telescopes
HISTORY   operating simultaneously. The main telescope used during the mission
HISTORY   was the 1-3 angstrom proportional counter which had a simple tube
HISTORY   for collimation. The field of view (FOV) was asymmetric with a full
HISTORY   width half maximum of 2.5 deg X 3.5 deg and an effective area of
HISTORY   17.8 cm**2. The other three telescopes were Wolter type 0 grazing
HISTORY   incidence telescopes with a dedicated detector.
HISTORY   Two were proportional counter (3-9 angstrom and 6-18 angstrom) and
HISTORY   the other a channel photomultiplier (CPM). The CPM suffers UV
HISTORY   contamination and provided no useful data.
HISTORY   The FOV (and the effective area) of the 3-9 and 6-18 angstrom
HISTORY   proportional counters could be set by using stops at the foci of
HISTORY   the telescopes. The 3-9 angstrom FOVs were 10 arcmin (large), 3.2
HISTORY   arcmin (intermediate) and 1.8 arcmin (small) corresponding to 3.7,
HISTORY   2.4 and 1 in cm**2 effective area respectively. The FOVs for the
HISTORY   6-18 angstrom detector were instead 10, 6 or 2 arcmin corresponding
HISTORY   to 12.3, 11.3 or 7.6 in cm**2 effective area. The 3-9 and 6-18
HISTORY   angstrom telescopes became inoperable in July 1973 following the
HISTORY   failure of the background shutter.
HISTORY   A six Pulse Height Analyzer (PHA) could be connected to any of the
HISTORY   three proportional counters and used to extract spectral information.
HISTORY   The basic time resolution was 62.509 seconds followed by 24 seconds
HISTORY   dead time. This resulted in a 86.509 sampling time. It was possible
HISTORY   to achieve higher time resolution, down to about 2 sec, with the
HISTORY   usage of the J20 mode. This mode was used only in few occasions and
HISTORY   was not scientifically useful.
HISTORY   ----------------------------------------------------------------------
HISTORY   This fits file contains data taken with all the telescopes.
HISTORY   All the fields found in the original data records were maintained in
HISTORY   the FITS file and three extra columns, TIME , PHA_SUM and TDIFF added.
HISTORY   The column description as given in the original documentation is
HISTORY   listed below. The TIMEDEL keyword value is always set to 62.509 sec
HISTORY   even when the J20 mode was operating. If J20 was in used the time
HISTORY   stamp is identical for many tens of rows. The usage of these are not
HISTORY   recommended.
HISTORY       TIME : seconds since the header keyword MJDREF
HISTORY       HOURS,MINUTES, SECONDS : store the UT time of the data frame
HISTORY                                start as was in the original file
HISTORY       DAY and YEAR : day of the year and year
HISTORY       ORBITADS: the orbital address (value 0-63)
HISTORY       OBS_CNSTR: orbital constrain (value 1-11)
HISTORY                  The values have the following meaning:
HISTORY                  1 = no constrain,
HISTORY                  2 = observation through earth atmosphere,
HISTORY                  3 = pointing sunlight earth,
HISTORY                  4 = pointing dark earth
HISTORY                  5 = South Atlantic Anomaly
HISTORY                6-8 = unknown
HISTORY                  9 = pointing near Sun
HISTORY                 10 = pointing near moon
HISTORY                 11 = observation during spacecraft night
HISTORY       TIME_ACPT: count acceptance period (value 0-127).  If not zero
HISTORY                  indicates the length in time (in spacecraft half
HISTORY                  seconds) the experiment was counting before one of
HISTORY                  the scalars filled (only for bright sources). It is
HISTORY                  a measurement of how quickly the counter saturate.
HISTORY       CNT_1_3, CNT_3_9, CNT_6_18, and CNT_CPM
HISTORY                record the counts in the four detectors (value 0-4095)
HISTORY       SHUTTER, background shutter flag 0 = background 1 = stellar
HISTORY       PHA_DET : indicates which proportional counters fed the PHA
HISTORY                   1 = 3-9  angstrom
HISTORY                   2 = 1-3  angstrom
HISTORY                   3 = 6-18 angstrom
HISTORY       PHA_CNT: six channel spectrum
HISTORY       PHA_SUM: total counts records in the PHA_CNT
HISTORY       GRD_1_3, GRD_3_9, GRD_6_18: records the guard counts
HISTORY                                  (value 0-4095) particle background
HISTORY       SEN_1_3: SEN_3_9, SEN_6_18 gain mode(0=low 1=high)
HISTORY       PSDS_1_3: pulse shape discriminator speed (rise time
HISTORY                 0=slow 1=fast)
HISTORY       PSDM_1_3: pulse shape discriminator mode (rise time
HISTORY                 0=on 1=off)
HISTORY       HTF_1_3, HTF_3_9, HTF_6_18 and HTF_CPM:  High tension flag
HISTORY                 for detector (0=off 1=on)
HISTORY       HEATFLAG: experiment  heater (0=on 1=off)
HISTORY       BKGMODE: background alternate mode (0=on 1=off)
HISTORY       LOWVLTFL: low voltage (0=on 1=off)
HISTORY       LOWVLTMD: low voltage power supply(0=supply A, 1=supply B)
HISTORY       IRIS: iris selected (value 1-4). This determinate the FOV
HISTORY             1= small 2= large 3 intermediate
HISTORY       FILTER: filter selected (value 1-4)
HISTORY       ANTELGRP: analog telemetry group (group B 1 = group A)
HISTORY       OPMODE: operation mode (0=normal 1=calibration)
HISTORY       STYAXIS: star-tracker Y axis count (value 0-31)
HISTORY       STZAXIS: star-tracker Z axis count (value 0-31)
HISTORY       ANA_TEL1, ANA_TEL2, ANA_TEL3, ANA_TEL4, and
HISTORY       ANA_TEL5: analog telemetry words
HISTORY       TDIFF: time difference in seconds between subsequent rows
HISTORY   ----------------------------------------------------------------------
HISTORY   The original file structure contained a header followed by data
HISTORY   records. Data and header records consisted of 47 words. Two types
HISTORY   of header record were present in the files storing different
HISTORY   parameters. A string set to HEAD or SL (kept in this fits file
HISTORY   in the keyword IDHEADER) identified the header type. The SL data
HISTORY   are raster scan around a source position set in the HEAD observation
HISTORY   immediately preceding (in time) the SL observation.
HISTORY   In the HEAD header only the first 12 words were used to store
HISTORY   word(1-2)=HEAD, word(3)= month, word(4)=day word(5)=year,
HISTORY   word(6)=day of year, word(7-12)=target name. The SL header the
HISTORY   words(6-14) and words(30-47) were unused, the others contain:
HISTORY   words(1-3) = hour min and sec; word(4)=SL; word(5)=constrain flag;
HISTORY   words(15-19), words(20-24) and words(25-29) contain the pitch yaw
HISTORY   and roll information respectively. Although the documentation
HISTORY   reports that no other words in either header type (HEAD and SL type)
HISTORY   were used, the content of the entire record are kept for
HISTORY   completeness in the HISTORY card listed below.
HISTORY   **********************************************************************
HISTORY            HEAD|     2|     2|  1974|    33|
HISTORY    X PERSEI    |    57|   108|   110|    75|    45|    29|  3449|  2809|
HISTORY     3813|     1|     1|     1|     0|     0|     1|     1|     1|     0|
HISTORY        0|     0|     0|     0|     2|     3|     1|     0|     2|     2|
HISTORY       88|   169|   172|   197|   147|    33|  1974|
HISTORY   **********************************************************************
HISTORY   The header of original HEAD data file did not contain coordinates,
HISTORY   but only the object name and the observation log was not available
HISTORY   in a suitable form when these FITS files were created. The coordinates
HISTORY   in the RA_OBJ and DEC_OBJ keywords, for the fits file with
HISTORY   IDHEADER=HEAD, were obtained by cross-correlating the object name
HISTORY   with various catalogs available from HEASARC and SIMBAD and with the
HISTORY   object name listed in the archive of the Copernicus "Princeton
HISTORY   Experiment Package" (COP_PEP). In a few cases coordinates were
HISTORY   assigned using the observation log.
HISTORY   The SL files instead did not contain either coordinates or object
HISTORY   name. The RA_OBJ, DEC_OBJ, OBJECT keywords, in fits file with
HISTORY   IDHEADER=SL, are retained from the HEAD observation immediately
HISTORY   preceding (in time) the current SL file.
CHECKSUM= 'kAiak7ZXkAfak7ZW'   / HDU checksum updated 1999-05-11T12:20:59
DATASUM = '2495952283'         / data unit checksum updated 1999-05-11T12:20:59
END

[About Copernicus] [Archive] [Software] [Gallery] [Publications]