Data model: fpBIN

General description:

DR1 fpBIN files (photo v5_3) A 4x4 binned version of the corrected image after sky-subtraction. The counts in each binned pixel are the average of the counts in its associated 16 unbinned pixels after a global sky and scattering wings of stars have been subtracted (fpC and fpBIN header keyword SKY), scaled up a factor of BINFAC (== 2^SHIFTED), with SOFTBIAS added afterwards. All pixels that are in atlas images are replaced by the background level before binning and sky subtraction, with suitable noise added. All of the header parameters from the raw image are inherited as well.

EDR fpBIN files (photo v5_2) A 4x4 binned version of the corrected image. The counts in each binned pixel are the average of the counts in its associated 16 unbinned pixels, scaled up a factor of BINFAC (== 2^SHIFTED). All pixels that are in atlas images are replaced by the background level before binning, with suitable noise added. All of the header parameters from the raw image are inherited as well.

Naming convention: fpBIN-rrrrrr-bc-ffff.fit, where rrrrrr is the imaging run number, b is the filter used (u, g, r, i, or z), c is the column location in the Imaging Array of the CCD which acquired the data (1-6), and ffff is the field number within the run.

Approximate size: 357.120 Kb per file. 5 files per field. Total of 1,785.6 Mb for a single frames pipeline run with 1000 fields.

File type: FITS image

Read by products:

Written by products: frames

Primary header

DR1 version (photo v5_3)

SIMPLE  =                    T
BITPIX  =                   16
NAXIS   =                    2
NAXIS1  =                  512
NAXIS2  =                  372
BZERO   = 3.27680000000000E+04
BSCALE  = 1.00000000000000E+00
TAI     =        4461557881.39 / 1st row - Number of seconds since Nov 17 1858
RA      =            257.72569 / 1st row - Right ascension of telescope boresigh
DEC     =            59.298150 / 1st row - Declination of telescope boresight (d
SPA     =             160.117  / 1st row - Camera col position angle wrt north (
IPA     =             295.168  / 1st row - Instrument rotator position angle (de
IPARATE =             -0.0001  / 1st row - Instrument rotator angular velocity (
AZ      =            154.45981 / 1st row - Azimuth  (encoder) of tele (0=N?) (de
ALT     =            58.184500 / 1st row - Altitude (encoder) of tele        (de
FOCUS   = -999999999999.999999 / 1st row - Focus piston (microns?)
DATE-OBS= '2000-04-04'         / 1st row - TAI date
TAIHMS  = '09:38:01.39'        / 1st row - TAI time (HH:MM:SS.SS) (TAI-UT = appr
COMMENT  TAI,RA,DEC,SPA,IPA,IPARATE,AZ,ALT,FOCUS at reading of col 0, row 0
BUNITS  = 'ADUs    '
ORIGIN  = 'SDSS    '
TELESCOP= '2.5m    '
TIMESYS = 'TAI     '
RUN     =                 1336 / Run number
FRAME   =                   53 / Frame sequence number within the run
CCDLOC  =                   11 / Survey location of CCD (e.g., rowCol)
STRIPE  =                   42 / Stripe index number (23 <--> eta=0)
STRIP   = 'N       '           / Strip in the stripe being tracked.
FLAVOR  = 'science '           / Flavor of this run
SYS_SCN = 'mean    '           / System of the scan great circle (e.g., mean)
EQNX_SCN=           2000.00    / Equinox of the scan great circle. (years)
NODE    =           95.00000   / RA of the great circle's ascending node (deg)
INCL    =           80.00000   / Great circle's inclination wrt cel. eq. (deg)
XBORE   =           -22.74     / Boresight x offset from the array center (mm)
YBORE   =           0.00       / Boresight x offset from the array center (mm)
OBJECT  = '42 N    '           / e.g., 'stripe 50.6 degrees, north strip'
EXPTIME = '53.907456'          / Exposure time (seconds)
EQUINOX = '2000.0  '           / Equinox of the TCC coordinates (years)
SYSTEM  = 'FK5     '           / System of the TCC coordinates (e.g., mean)
CCDMODE = 'DRIFT   '           / 'STARING' or 'DRIFT'
C_OBS   =                26322 / CCD row clock rate (usec/row)
COLBIN  =                    1 / Binning factor perpendicular to the columns
ROWBIN  =                    1 / Binning factor perpendicular to the rows
DAVERS  = 'v14_20  '           / Version of DA software
COMMENT  CCD-specific parameters
CAMROW  =                    1 / Row in the imaging camera
BADLINES=                    0 / Number of bad lines in frame
FLUX20  = 2.07340000000000E+03 / Number of DN in 20th mag object
FLUX0   = -9.9990000000000E+03 / Number of DN in 0th mag object
FCALI_ID= 'None    '
SKY     = 1.23440000000000E+02 / Approx. sky level (DN)
BUNIT   = 'DNs     '
FILTER  = 'r       '           / filter used
CAMCOL  =                    1 / column in the imaging camera
BINFAC  =                    4 / Amount image is binned by
SHIFTED =                    2 / Number of bits image is scaled up
ROW0    =                    0 / Row origin of binned image
COL0    =                    0 / Column origin of binned image
CSIZE   =                 2048 / ncol for original image
RSIZE   =                 1489 / nrow for original image
SOFTBIAS=                 1000 / software "bias" added to all DN
VERSION = 'XXX     '           / Version of photo used.
DERV_VER= 'v8_15   '           / Version of dervish used
ASTR_VER= 'v5_13   '           / Version of astrotools used
ASTRO_ID= 'XXX     '           / Astrometric pipeline run identifier.
BIAS_ID = 'XXX     '           / Bias pipeline run identifier.
FRAME_ID= 'XXX     '           / Frames pipeline run identifier.
KO_VER  = 'XXX     '           / Version of known object catalog used.
PS_ID   = 'XXX     '           / Postage stamp pipeline run identifier.
EXTEND  =                    T
ATVSN   = 'v5_13   '           / ASTROTOOLS version tag
RADECSYS= 'ICRS    '           / International Celestial Reference Sys
CTYPE1  = 'DEC--TAN'           / X (Column) Axis Projection
CTYPE2  = 'RA---TAN'           / Y (Row) Axis Projection
CUNIT1  = 'deg     '           / Column Axis Units
CUNIT2  = 'deg     '           / Row Axis Units
CRPIX1  = 2.56500000000000E+02 / Column Pixel Coordinate of Reference
CRPIX2  = 1.86500000000000E+02 / Row Pixel Coordinate of Reference Pix
CRVAL1  = 5.84369373300000E+01 / DEC at Reference Pixel
CRVAL2  = 2.56399396510000E+02 / RA at Reference Pixel
CD1_1   = 1.57331035156250E-04 / DEC degrees per column pixel
CD1_2   = -4.1065817204300E-04 / DEC degrees per row pixel
CD2_1   = 4.10884085384116E-04 / RA  degrees per column pixel
CD2_2   = 1.57749907535816E-04 / RA  degrees per row pixel
END

Older version of the fpBIN header - not sure what it applies to


SIMPLE  =                    T
BITPIX  =                   16
NAXIS   =                    2
NAXIS1  =                  512
NAXIS2  =                  372
BSCALE  =                    1
BZERO   =                32768
BINFAC  =                    4 / Amount image is binned by
SHIFTED =                    2 / Number of bits image is scaled up
ROW0    =                   12 / Row origin of binned image
COL0    =                    3 / Column origin of binned image
CSIZE   =                 2048 / ncol for original image
RSIZE   =                 1489 / nrow for original image
SOFTBIAS=                  XXX / Software "bias" added to each pixel
VERSION = 'XXX     '           / Version of software used.
PS_ID   = 'XXX     '           / Postage stamp pipeline run identifier.
BIAS_ID = 'XXX     '           / Bias pipeline run identifier.
ASTRO_ID= 'XXX     '           / Astrometric pipeline run identifier.
FRAME_ID= 'XXX     '           / Frames pipeline run identifier.
KO_VER  = 'XXX     '           / Version of known object catalog used.
RUN     =                  XXX / Imaging run number.
FIELD   =                  XXX / Field sequence number within the run.
CAMCOL  =                  XXX / Column in the imaging camera.
FILTER  = 'XXX     '           / Filter (u, g, r, i, or z).
RADECSYS= 'ICRS    '           / International Celestial Reference Sys
CTYPE1  = 'DEC--TAN'           / X (Column) Axis Projection
CTYPE2  = 'RA---TAN'           / Y (Row) Axis Projection
CUNIT1  = 'deg     '           / Column Axis Units
CUNIT2  = 'deg     '           / Row Axis Units
CRPIX1  = 1.02400000000000E+03 / Column Pixel Coordinate of Reference
CRPIX2  = 6.80000000000000E+02 / Row Pixel Coordinate of Reference Pix
CRVAL1  = -3.1788873000000E-01 / DEC at Reference Pixel
CRVAL2  = 1.88473355950000E+02 / RA at Reference Pixel
CD1_1   = 1.10005818270640E-04 / DEC degrees per column pixel
CD1_2   = 1.31691176470661E-08 / DEC degrees per row pixel
CD2_1   = -4.1308597225549E-08 / RA  degrees per column pixel
CD2_2   = 1.09963954550070E-04 / RA  degrees per row pixel
END