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OSIRIS FITS Headers

A sample OSIRIS FITS header is given below. The inline comments should provide adequate definition of the various header parameters. Not all cards will appear in all FITS headers (some are included during engineering checkout, or are optional cards that enter the header only when requested by certain configurations).

SIMPLE  =                    T /
BITPIX  =                  -32 /
NAXIS   =                    2 /
NAXIS1  =                 1024 /
NAXIS2  =                 1024 /
COMMENT   DATA FORMAT
FORMAT  = 'DELACED '           / Data interlacing & coadding info
DATATYPE= 'DIF     '           / Data description; prereads,postreads or dif
BSCALE  =                    1 / PHYSICAL=INTEGER*BSCALE+BZERO
BZERO   =                    0 /
COMMENT   ARRAY CONTROLLER PARAMETERS
NSAMPLES=                    1 / Number of samples
READMODE= 'RESET-PRE-POST'     / Readout type: Post-Reset-Pre or Reset-Pre-Post
SAMPLED = 'FRAMES  '           / Sample type: frame, line or column
GAINDL  =                   20 / Pixel integration time, sequencer clocks
PIXITIME=            6.3000E-6 / Pixel integration time, seconds
RESETDL =                   10 / Line reset time, sequencer clocks
RSTPAUSE=                   13 / Pause after reset, sequencer clocks * 65536
ERASE   =                    0 / Number of prep cycles before acquisition
PRPRSTDL=                   10 / Prep cycle line reset time, sequencer clocks
PRPRSTPS=                   25 / Prep cycle pause after reset, clocks * 65536
PRPGANDL=                   35 / Prep cycle integration time, seq. clocks
COMMENT   OBSERVATION DESCRIPTION
IMAGETYP= 'OBJECT  '           / Image Type Code
OBJECT  = 'Orion XDisp Spectrum' / Object Name
TIMESYS = 'UT      '           / Coordinated Universal Time
UT      = '01:31:08.1'         / UTC time [hhmmss.s]
TIME-OBS= '01:31:08.1'         / UTC time at start of exposure [hhmmss.s]
DATE-OBS= '1999-02-24'         / UTC date at start of exposure [ccyy-mm-dd]
EXPTIME =                60.03 / exposure time [seconds]
NCOADDS =                    1 / Number of coadded frames
FILENAME= 'orion.001'          / Filename
UNIQNAME= '990223N4.08x'       / System unique filename for image
OBSERVER= 'Blum, DePoy, & Pogge' / Observer name(s)
INSTRUME= 'OSIRIS  '           / Instrument name
DETECTOR= 'NICMOS 4'           / Detector name
OBSERVAT= 'CTIO    '           / Observatory name
TELESCOP= 'ct4m    '           / CTIO 4-m Blanco Telescope
FOCUS   = 'f15     '           / f15 tip-tilt Cassegrain focus
LATITUDE= '-30:09:55.5'        / Telescope Latitude [degrees]
LONGITUD= '70:48:52.7'         / Telescope Longitude [degrees W]
ELEVATIO=                 2200 / Telescope Elevation [meters]
DISPAXIS=                    1 / Dispersion axis on the array
COMMENT   Space for an observer comment...
COMMENT   INSTRUMENT CONFIGURATION
MODE    = 'SP      '           / Mode [IMaging,SPectra,ACQuisition]
FILTER  =                    9 / Main Filter Wheel position
FILTERID= 'Grism'              / Filter ID
CAMERA  =                    0 / Camera Turret Position
CAMERAID= 'f2.8    '           / Camera ID
CAMFOCUS=                  245 / Camera focus (encoder position)
XPUPIL  =               -32767 / Pupil mask X-Axis position
YPUPIL  =                   40 / Pupil mask Y-Axis position
SLIDER  =                    0 / Prefilter and pupil slider position
SLIDERID= 'Out of Beam'        / Prefilter and pupil location
PREFILT =                    1 / Prefilter Wheel Position
PREFLTID= 'Open    '           / Prefilter ID
SLIT    =                    1 / Slit Mask Position
SLITID  = 'X-Disp + Filter'    / Slit ID
GRATING =                    1 / 0=Grating, 1=Imaging Flat
GRATNGID= 'In Beam '           / Grating location
GRATTILT=                  292 / Grating tilt [encoder units]
COMMENT   TELESCOPE DATA
RA      = '05:35:17.61'        / Telescope Right Ascension [hhmmss.ss]
DEC     = '-05:22:40.6'        / Telescope Declination [ddmmss.s]
EQUINOX =               2000.0 / Equinox of RA and DEC
ST      = '07:01:53.5'         / Local Sidereal Time [hhmmss.s]
HA      = '01:26:38.4'         / Hour Angle [hhmmss.s]
ZD      =                 32.1 / Zenith distance [degrees]
AIRMASS =                1.180 / Airmass [Sec ZD]
DOMEAZ  =                 15.0 / Dome Azimuth [degrees]
TELFOCUS                       / Telescope focus
RECID   = 'ct4m.990224.010551' / NOAO Archive record ID
END

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Updated: 1999 May 10 [osiris@astronomy.ohio-state.edu]