TABLE  FieldSystem

Contains information about the systems of field centres used in the SSA.

The Schmidt photographic surveys were based around predefined systems of
field centres. This table lists the ones employed in the photographic
surveys used to generate the SSA.

NameTypeLengthUnitDescriptionDefault ValueUnified Content Descriptor
systemIDtinyint1 The system of survey fields used for the survey  ID_MAIN
namevarchar32 The name of the system, eg. "ESO/SRC", "POSS-I" etc.  NOTE
centrePitchreal4degrees The pitch of the field centres  OBS_DIFF
Total length37

TABLE  Survey

Contains information about the Schmidt photographic surveys in the SSA.

The SuperCOSMOS Science Archive was created from machine scans of
the UK, ESO and Palomar Oschin Schmidt telescope surveys undertaken
from 1949 to 2003. Each individual passband survey (eg. SERC-J/EJ,
POSS-I E etc.) is described in this table.

NameTypeLengthUnitDescriptionDefault ValueUnified Content Descriptor
surveyIDtinyint1 Unique survey identifier in the SSA  ID_SURVEY
surveyNamevarchar16 Survey name, eg. SERC-J/EJ  ID_CATALOG
systemIDtinyint1 The system of survey fields used for the survey  NOTE
fieldOfViewreal4degrees The nominal field of view of each survey plate  INST_DET_SIZE
decMinfloat8degrees Southern (Dec) limit of survey  POS_EQ_DEC
decMaxfloat8degrees Northern (Dec) limit of survey  POS_EQ_DEC
numFieldsint4 No. of fields in the survey  NUMBER
telescopevarchar64 UK, ESO or Palomar Oschin Schmidt  TEL_ID
telAperturefloat8metres Telescope aperture  TEL_SIZE
telLongfloat8degrees Telescope longitude  POS_EARTH_LON_MAIN
telLatfloat8degress Telescope latitude  POS_EARTH_LAT_MAIN
telHeightreal4metres Telescope altitude  OBSTY_ALTITUDE
plateScalereal4arcsec/mm Nominal plate scale  INST_SCALE
colourvarchar16 Survey colour, eg. blue, red or near-infrared  OBS_BAND
waveMinint4nanometres Approximate minimum wavelength  INST_WAVELENGTH_VALUE
waveMaxint4nanometres Approximate maximum wavelength  INST_WAVELENGTH_VALUE
waveEffint4nanometres Approximate effective wavelength  INST_WAVELENGTH_EFFECTIVE
magLimitreal4 Nominal mag limit of survey, eg. 22.5 for Bj  PHOT_MAG_LIMIT
epochMinreal4year Minimum epoch of observations  TIME_EPOCH
epochMaxreal4year Maximum epoch of observations  TIME_EPOCH
epTsysvarchar16 Time system for epoch values in SurveyCatalog  NOTE
equinoxreal4year Equinox for positions in SurveyCatalog  TIME_EQUINOX
eqTsysvarchar16 Time system for equinox in SurveyCatalog  NOTE
surveyRefvarchar256 Literature reference for survey  REFER_CODE
Total length470

TABLE  Plate

Contains information about each survey plate measurement used in the SSA.

The details of each plate (eg. emulsion, filter, epoch etc.) and the
measurement (eg. date, time, machine etc.) are stored in this
table, along with image map processing parameters (eg. detection
threshold, astrometric solution, etc.)

NameTypeLengthUnitDescriptionDefault ValueUnified Content Descriptor
plateIDint4 Unique identifier of the plate: surveyID plus field number combo  ID_PLATE
surveyIDtinyint1 Every plate comes from a survey  ID_SURVEY
fieldIDint4 Unique survey field identifier  ID_FIELD
plateNumsmallint2 Plate number assigned by observatory  ID_PLATE
dateMeasdatetime16MM-DD-YYYY Measurement date 12-31-9999 TIME_DATE
timeMeasvarchar8 Measurement time (local), eg. 15:33:47  TIME_MISC
instrumentvarchar16 Name of scanning machine  INST_ID
softVersionvarchar18 Software version, eg. /home/scosdev/v033  ID_VERSION
operatorvarchar3 Machine operator's username  ID_HUMAN
scanMaterialvarchar16 Photographic medium, eg. Original glass, Copy film, Copy glass  REMARKS
emulsionvarchar8 Kodak emulsion type, eg. 103a-E, IIIa-J, IV-N  INST_PLATE_EMULSION
filterIDvarchar8 Filter identifier, eg. OG590, RG715, 2444...  INST_FILTER_CODE
filterCommvarchar16 Filter type, eg. "Schott glass", "Red plexiglass"...  INST_FILTER_CODE
raPntreal4degrees Mean plate centre RA  POS_EQ_RA_MAIN
decPntreal4degrees Mean plate centre Dec  POS_EQ_DEC_MAIN
radecSysvarchar4 Co-ordinate system of raPnt/decPnt, eg. FK4  POS_REFERENCE-SYSTEM
equinoxreal4year Equinox of raPnt and decPnt  TIME_EQUINOX
eqTsysvarchar12 Time system of equinox, eg. BESSELIAN  NOTE
utDateObsdatetime16MM-DD-YYYY UT date of observation 12-31-9999 TIME_DATE
lstObsvarchar424-hour Local sidereal time at start of exposure, eg. 2336  TIME_MISC
expLengthreal4minutes Exposure time  TIME_EXPTIME
epochreal4years Epoch of observation  TIME_EPOCH
domeTempreal4Kelvin Dome temp at observation  OBS_CONDITIONS
domePressurereal4mBar Dome pressure at observation  OBS_CONDITIONS
domeHumidreal4 Dome relative humidity at obsevation time  OBS_CONDITIONS
waveEffectsmallint2Angstrom Effective wavelength  INST_WAVELENGTH_EFFECTIVE
troplreal4K/m Tropospheric lapse rate  MODEL_PARAM
mjdfloat8Julian days Modified Julian Date at mid exposure  TIME_DATE
focusNXtinyint1 No. of scan focus points in X  INST_PARAM
focusNYtinyint1 No. of scan focus points in Y  INST_PARAM
calTypevarchar16 Intensity calibration wedge fit type, eg. SPLINE  INST_PARAM
stepWdgvarchar16 Intensity calibration step-wedge type, eg. kpno  INST_PARAM
nStepstinyint1 No. of intensity calibration wedge steps  INST_PARAM
orientationvarchar4 SuperCOSMOS plate orientation, eg. news  INST_PARAM
emulposvarchar4 SuperCOSMOS emulsion position, eg. up  INST_PARAM
sospsmallint2 SuperCOSMOS start of scan CCD pixel number  INST_PARAM
stepsizereal4microns SuperCOSMOS nominal pixel size  INST_PIXSIZE
scanlensmallint2pixels SuperCOSMOS CCD lane scan length  INST_PARAM
aXminreal4microns SuperCOSMOS XMIN of measured area  POS_PLATE_X
aXmaxreal4microns SuperCOSMOS XMAX of measured area  POS_PLATE_X
aYminreal4microns SuperCOSMOS YMIN of measured area  POS_PLATE_Y
aYmaxreal4microns SuperCOSMOS YMAX of measured area  POS_PLATE_Y
xPntreal4microns Centre of scan area in X  POS_PLATE_Y
yPntreal4microns Centre of scan area in Y  POS_PLATE_Y
areaCuttinyint1pixels Minimum area of detected object  NUMBER
apParamreal4 Areal profile parameter  REDUCT_PARAM
dbParamreal4 Deblending parameter  REDUCT_PARAM
dbAmintinyint1pixels Minimum area of parent image that can be deblended  REDUCT_PARAM
dbAmaxint4pixels Maximum area of parent image that can be deblended  REDUCT_PARAM
dbAcuttinyint1pixels Minimum area of deblended object detection  REDUCT_PARAM
dbLeveltinyint1 No. of rethresholding levels for deblending  REDUCT_PARAM
skySquaresmallint2pixels Blocksize (one side) of sky background  REDUCT_PARAM
skyDefnvarchar16 Method of defining sky, eg. "median"  REDUCT_METHOD
skyFiltervarchar16 Box filter weights for sky determination  REDUCT_PARAM
fThreshtinyint1 Sky filtering parameter  REDUCT_PARAM
fSclentinyint1 Scale size for iterative filter application  REDUCT_PARAM
pCutreal4percent Threshold "percentage cut" for pixel analysis  STAT_%REJECT
starCatvarchar80 Name of reference star catalogue used for astrometric fit  ID_CATALOG
brightLimreal4 Bright mag limit for selected astrometric refstars  PHOT_MAG_LIMIT
faintLimreal4 Faint limit for selected refstars  PHOT_MAG_LIMIT
equinRefreal4 Equinox of refstar positions  TIME_EQUINOX
tSysRefvarchar12 Time system of equinox of refstar positions, eg. JULIAN  NOTE
maxIterint4 Maximum no. of iterations for non-linear astrometric fit  NUMBER
rCritInireal4microns Initial matching tolerance for refstars  REDUCT_PARAM
rCritAbsreal4microns Absolute object rejection criterion  REDUCT_PARAM
rCritRelreal4 Relative object rejection criterion  REDUCT_PARAM
rCritFinreal4sigma Final residual tolerance  REDUCT_PARAM
distTypevarchar80 Radial distortion term in solution, eg. R/TAN(R)  MODEL_CORRECTION
scdGridvarchar80 Non-linear distortion mask filename  ID_FILE
raColvarchar16 Name of RA column in reference catalogue  REMARKS
decColvarchar16 Name of Dec column in reference catalogue  REMARKS
raPMColvarchar16 Name of RA proper motion column in reference catalogue  REMARKS
decPMColvarchar16 Name of Dec proper motion column in reference catalogue  REMARKS
plxColvarchar16 Name of parallax column in reference catalogue  REMARKS
rvColvarchar16 Name of radial velocity column in reference catalogue  REMARKS
magColvarchar16 Name of magnitude column in reference catalogue  REMARKS
cEquinoxreal4year Catalogue equinox  TIME_EQUINOX
cEqTSysvarchar16 Catalogue equinox time system, eg. JULIAN  NOTE
cEpochreal4year Catalogue epoch  TIME_EPOCH
cEpTSysvarchar16 Catalogue epoch time system, eg. JULIAN  NOTE
starsInitint4 No. of refstars in initial astrometric solution  NUMBER
starsSelecint4 No. of refstars initially selected  NUMBER
starsUsedint4 No. of refstars in final astrometric solution  NUMBER
coeffs1float8 1st coefficient of astrometric fit for XY to obs. xi,eta  FIT_PARAM_VALUE
coeffs2float8 2nd coefficient of astrometric fit for XY to obs. xi,eta  FIT_PARAM_VALUE
coeffs3float8 3rd coefficient of astrometric fit for XY to obs. xi,eta  FIT_PARAM_VALUE
coeffs4float8 4th coefficient of astrometric fit for XY to obs. xi,eta  FIT_PARAM_VALUE
coeffs5float8 5th coefficient of astrometric fit for XY to obs. xi,eta  FIT_PARAM_VALUE
coeffs6float8 6th coefficient of astrometric fit for XY to obs. xi,eta  FIT_PARAM_VALUE
cubicDistfloat8 Cubic coefficient of radial distortion  FIT_PARAM_VALUE
obsRaPntfloat8radians Observed plate centre RA  POS_EQ_RA_MAIN
obsDecPntfloat8radians Observed plate centre Dec  POS_EQ_DEC_MAIN
shiftPntfloat8radians Shift of from nominal to fitted plate centre  POS_OFFSET
areaMinint4pixels Minimum object area in IAM file  EXTENSION_AREA
areaMaxint4pixels Maximum object area in IAM file EXTENSION_AREA
magMinreal4 Minimum instrumental mag in IAM file  PHOT_MAG_LIMIT
magMaxreal4 Maximum instrumental mag in IAM file  PHOT_MAG_LIMIT
ellipMinreal4 Minimum object ellipticity in IAM file  PHYS_ELLIPTICITY
ellipMaxreal4 Maximum object ellipticity in IAM file  PHYS_ELLIPTICITY
ellipModereal4 Modal object ellipticity in IAM file  PHYS_ELLIPTICITY
orientModereal4degrees Modal orientation in IAM file  POS_POS-ANG
ellipMedreal4 Median ellipticity in IAM file  PHYS_ELLIPTICITY
orientMedreal4degrees Median orientation in IAM file  POS_POS-ANG
ellipMeanreal4 Mean object ellipticity in IAM file  PHYS_ELLIPTICITY
orientMeanreal4degrees Mean orientation in IAM file  POS_POS-ANG
objNumint4 No. of objects detected on plate  NUMBER
nParentsint4 No. of parent objects detected on plate  NUMBER
lane1Countint4 No. of objects in lane 1 of plate scan  NUMBER
lane2Countint4 No. of objects in lane 2 of plate scan  NUMBER
lane3Countint4 No. of objects in lane 3 of plate scan  NUMBER
lane4Countint4 No. of objects in lane 4 of plate scan  NUMBER
lane5Countint4 No. of objects in lane 5 of plate scan  NUMBER
lane6Countint4 No. of objects in lane 6 of plate scan  NUMBER
lane7Countint4 No. of objects in lane 7 of plate scan  NUMBER
lane8Countint4 No. of objects in lane 8 of plate scan  NUMBER
lane9Countint4 No. of objects in lane 9 of plate scan  NUMBER
lane10Countint4 No. of objects in lane 10 of plate scan  NUMBER
lane11Countint4 No. of objects in lane 11 of plate scan  NUMBER
lane12Countint4 No. of objects in lane 12 of plate scan  NUMBER
lane13Countint4 No. of objects in lane 13 of plate scan  NUMBER
lane14Countint4 No. of objects in lane 14 of plate scan  NUMBER
lane15Countint4 No. of objects in lane 15 of plate scan  NUMBER
lane16Countint4 No. of objects in lane 16 of plate scan  NUMBER
lane17Countint4 No. of objects in lane 17 of plate scan  NUMBER
lane18Countint4 No. of objects in lane 18 of plate scan  NUMBER
lane19Countint4 No. of objects in lane 19 of plate scan  NUMBER
lane20Countint4 No. of objects in lane 20 of plate scan  NUMBER
lane21Countint4 No. of objects in lane 21 of plate scan  NUMBER
lane22Countint4 No. of objects in lane 22 of plate scan  NUMBER
lane23Countint4 No. of objects in lane 23 of plate scan  NUMBER
lane24Countint4 No. of objects in lane 24 of plate scan  NUMBER
lane25Countint4 No. of objects in lane 25 of plate scan  NUMBER
lane26Countint4 No. of objects in lane 26 of plate scan  NUMBER
lane27Countint4 No. of objects in lane 27 of plate scan  NUMBER
lane28Countint4 No. of objects in lane 28 of plate scan  NUMBER
lane29Countint4 No. of objects in lane 29 of plate scan  NUMBER
lane30Countint4 No. of objects in lane 30 of plate scan  NUMBER
astResidXreal4arcsec Residual of astrometric fit in X  FIT_RESIDUAL
astResidYreal4arcsec Residual of astrometric fit in Y  FIT_RESIDUAL
nCalCoeffstinyint1 No. of photometric calibration coefficients  FIT_PARAM_VALUE
CalXKreal4inst. profile mag Stationary point in profile cal. curve  FIT_PARAM_VALUE
gradientreal4 Gradient of linear portion of profile cal. curve  FIT_PARAM_VALUE
getCal1float8 1st profile calibration polynomial coefficient  FIT_PARAM_VALUE
getCal2float8 2nd profile calibration polynomial coefficient  FIT_PARAM_VALUE
getCal3float8 3rd profile calibration polynomial coefficient  FIT_PARAM_VALUE
getCal4float8 4th profile calibration polynomial coefficient  FIT_PARAM_VALUE
getCal5float8 5th profile calibration polynomial coefficient  FIT_PARAM_VALUE
getCal6float8 6th profile calibration polynomial coefficient  FIT_PARAM_VALUE
ffZpreal4mag Field-to-field zeropoint  PHOT_ZPT
galZpfloat8mag Zeropoint of galaxy instrumental scale  PHOT_ZPT
galGradfloat8mags per instrumental mag Gradient of galaxy instrumental mag scale  FIT_PARAM_VALUE
directoryvarchar80 Name of directory in flat-file system of source data.  ID_FILE
Total length1202

TABLE  Detection

Contains individual plate detections for every plate in the SSA.

Each scanned plate in the SSA results in a pixel map. This map
was processed using standard software (known as Image Analysis Mode,
or IAM, software) to produce a list of parameterised detections on each
plate. This table contains all the attributes for each detected object.
The attribute set consists of the standard 32 IAM parameters plus
calibrated photometry and spatial index quantities.

NameTypeLengthUnitDescriptionDefault ValueUnified Content Descriptor
objIDbigint8 Unique object identification number  ID_MAIN
surveyIDtinyint1 The survey that collected the data  ID_SURVEY
plateIDint4 Plate ID of the plate that this detection came from  ID_PLATE
parentIDbigint8 objID of parent object, = objID for parent/undeblended (ie. not child) object  ID_PARENT
sourceIDbigint8 objID for corresponding merged record in Source  ID_ASSOCIATED
recNumint4 The record number in the original IAM file  RECORD
rafloat8degrees Celestial Right Ascension  POS_EQ_RA_MAIN
decfloat8degrees Celestial Declination  POS_EQ_DEC_MAIN
htmIdbigint8 Hierarchical Triangular Mesh (20-deep) of centroid  POS_GENERAL
cxfloat8 Cartesian x of unit (ra,dec) vector on celestial sphere  POS_EQ_X
cyfloat8 Cartesian y of unit (ra,dec) vector on celestial sphere  POS_EQ_Y
czfloat8 Cartesian z of unit (ra,dec) vector on celestial sphere  POS_EQ_Z
xminfloat8microns Leftmost extent of image on plate  POS_PLATE_X
xmaxfloat8microns Rightmost extent of image on plate  POS_PLATE_X
yminfloat8microns Bottommost extent of image on plate  POS_PLATE_Y
ymaxfloat8microns Topmost extent of image on plate  POS_PLATE_Y
areaint4pixels Area within detection isophote  EXTENSION_AREA
ipeakreal4instrumental units Intensity of brightest pixel above sky  PHOT_INTENSITY_MISC
cosmagreal4instrumental units Isophotal magnitude  PHOT_PHG_MAG
iskyreal4 Estimate of sky intensity at (xCen, yCen)  PHOT_SB_SKY
xCenfloat8microns Intensity-weighted X-centroid of image  POS_PLATE_X
yCenfloat8microns Intensity-weighted Y-centroid of image  POS_PLATE_Y
aUreal4microns Semi-major axis of unweighted fitted ellipse  EXTENSION_RAD
bUreal4microns Semi-minor axis of unweighted fitted ellipse  EXTENSION_SMIN
thetaUsmallint2degrees Position angle (wrt x-axis) of unweighted fitted ellipse  POS_POS-ANG
aIreal4microns Semi-major axis of intensity-weighted fitted ellip.  EXTENSION_RAD
bIreal4microns Semi-minor axis of intensity-weighted fitted ellip.  EXTENSION_SMIN
thetaIsmallint2degrees Position angle (wrt x-axis) of intensity-weighted fitted ellipse  POS_POS-ANG
classtinyint1 Classification flag  CLASS_OBJECT
pasmallint2degrees Celestial position angle (E of N)  POS_POS-ANG
ap1int4pixels Area above 1st areal profile threshold  EXTENSION_AREA
ap2int4pixels Area above 2nd areal profile threshold  EXTENSION_AREA
ap3int4pixels Area above 3rd areal profile threshold  EXTENSION_AREA
ap4int4pixels Area above 4th areal profile threshold  EXTENSION_AREA
ap5int4pixels Area above 5th areal profile threshold  EXTENSION_AREA
ap6int4pixels Area above 6th areal profile threshold  EXTENSION_AREA
ap7int4pixels Area above 7th areal profile threshold  EXTENSION_AREA
ap8int4pixels Area above 8th areal profile threshold  EXTENSION_AREA
blendint4 Deblend flag: -n=parent of n children; +n = nth child of a parent  CODE_MULT_INDEX
qualityint4 Bitwise quality flag  CODE_QUALITY
prfStatreal4N(0,1) Profile statistic  CLASS_STAR/GALAXY
prfMagreal4instrumental units Profile magnitude  PHOT_PHG_MAG
gMagreal4mag Magnitude calculated on assumption object is galaxy  MODEL_MAG_VALUE
sMagreal4mag Magnitude calculated on assumption object is star  MODEL_MAG_VALUE
SSAfieldsmallint2 SSS field number (ESO/SRC system) that this detection falls in.  ID_FIELD
seamsmallint2 Seam index: = zero or SSAfield for seamless selection  ID_FIELD
Total length228

TABLE  JunkDetection

Contains a subset of the entries in Detection that are flagged as junk

Each set of plate detections in the SSA has been run through an automated
junk detection algorithm (Storkey et al., 2003) to flag any objects that
are a result of curvi-linear lines, circular or halo-type artifacts on the
source photographic material. These junk identifications are done with a
high degree of accuracy and attributes describing the junk detections are
recorded in this table.

NameTypeLengthUnitDescriptionDefault ValueUnified Content Descriptor
objIDbigint8 Unique object identification number from Detection  ID_MAIN
junkSourcetinyint1 Source of junk: 1=satellite track; 2=diffraction spike; 3=bright stellar halo  CLASS_CODE
invSGDensint4 Local inverse star/galaxy density  PHYS_DENSITY_SURFACE
trackAnglereal4degrees Angle of track or diffraction spike -999.995 POS_POS-ANG
brightObjIDbigint8 The Detection.objID of the artifact-inducing bright star 0 ID_ASSOCIATED
haloRadiusreal4arcsec Vertical half-major axis of halo ellipse 0.0 EXTENSION_RAD
postProbreal4 Posterior probability of detection being junk  STAT_PROBABILITY
Total length33

TABLE  Source

Contains merged sources for every field in the SSA.

Each field within the SSA is covered by four plates in passbands B, R and
I with R being covered twice at different times. This results in
four-plate multi-colour, multi-epoch data which are merged into a single
source catalogue for general science exploitation. This table contains the
associated merged records created from the records in table Detection,
along with a full astrometric solution (including proper motions) computed
from the available position measures. The most useful subset of image
morphological descriptors are also propagated into this table for ease of
use.

NameTypeLengthUnitDescriptionDefault ValueUnified Content Descriptor
objIDbigint8 Unique identifier of merged source  ID_MAIN
objIDBbigint8 objID for B band detection merged into this object 0 ID_ASSOCIATED
objIDR1bigint8 objID for R1 band detection merged into this object 0 ID_ASSOCIATED
objIDR2bigint8 objID for R2 band detection merged into this object 0 ID_ASSOCIATED
objIDIbigint8 objID for I band detection merged into this object 0 ID_ASSOCIATED
htmIdbigint8 Hierarchical Triangular Mesh (20-deep) of centroid  POS_GENERAL
epochreal4year Epoch of position (variance weighted mean epoch of available measures)  TIME_EPOCH
rafloat8degrees Mean RA, computed from detections merged in this catalogue  POS_EQ_RA_MAIN
decfloat8degrees Mean Dec, computed from detections merged in this catalogue  POS_EQ_DEC_MAIN
sigRAfloat8degrees Uncertainty in RA (formal random error not inc. systematic errors)  ERROR
sigDecfloat8degrees Uncertainty in Dec (formal random error not inc. systematic errors)  ERROR
cxfloat8 Cartesian x of unit (ra,dec) vector on celestial sphere  POS_EQ_X
cyfloat8 Cartesian y of unit (ra,dec) vector on celestial sphere  POS_EQ_Y
czfloat8 Cartesian z of unit (ra,dec) vector on celestial sphere  POS_EQ_Z
muAcosDreal4mas/yr Proper motion in RA direction -0.99999995e9 POS_EQ_PMRA
muDreal4mas/yr Proper motion in Dec direction -0.99999995e9 POS_EQ_PMDEC
sigMuAcosDreal4mas/yr Error on proper motion in RA direction -0.99999995e9 ERROR
sigMuDreal4mas/yr Error on proper motion in Dec direction -0.99999995e9 ERROR
chi2real4 Chi-squared value of proper motion solution -0.99999995e9 FIT_CHI2
Nplatestinyint1 No. of plates used for this proper motion measurement  NUMBER
classMagBreal4mag B band magnitude selected by B image class -99.999995 PHOT_PHG_BJ
classMagR1real4mag R1 band magnitude selected by R1 image class -99.999995 PHOT_PHG_R
classMagR2real4mag R2 band magnitude selected by R2 image class -99.999995 PHOT_PHG_R
classMagIreal4mag I band magnitude selected by I image class -99.999995 PHOT_PHG_I
gCorMagBreal4mag B band magnitude assuming object is galaxy -99.999995 PHOT_PHG_BJ
gCorMagR1real4mag R1 band magnitude assuming object is galaxy -99.999995 PHOT_PHG_R
gCorMagR2real4mag R2 band magnitude assuming object is galaxy -99.999995 PHOT_PHG_R
gCorMagIreal4mag I band magnitude assuming object is galaxy -99.999995 PHOT_PHG_I
sCorMagBreal4mag B band magnitude assuming object is star -99.999995 PHOT_PHG_BJ
sCorMagR1real4mag R1 band magnitude assuming object is star -99.999995 PHOT_PHG_R
sCorMagR2real4mag R2 band magnitude assuming object is star -99.999995 PHOT_PHG_R
sCorMagIreal4mag I band magnitude assuming object is star -99.999995 PHOT_PHG_I
meanClasstinyint1 Estimate of image class based on unit-weighted mean of individual classes  CLASS_OBJECT
classBtinyint1 Image classification from B band detection 0 CLASS_OBJECT
classR1tinyint1 Image classification from R1 band detection 0 CLASS_OBJECT
classR2tinyint1 Image classification from R2 band detection 0 CLASS_OBJECT
classItinyint1 Image classification from I band detection 0 CLASS_OBJECT
ellipBreal4 Ellipticity of B band detection -0.99999995e9 PHYS_ELLIPTICITY
ellipR1real4 Ellipticity of R1 band detection -0.99999995e9 PHYS_ELLIPTICITY
ellipR2real4 Ellipticity of R2 band detection -0.99999995e9 PHYS_ELLIPTICITY
ellipIreal4 Ellipticity of I band detection -0.99999995e9 PHYS_ELLIPTICITY
qualBint4 Bitwise quality flag from B band detection -1 CODE_QUALITY
qualR1int4 Bitwise quality flag from R1 band detection -1 CODE_QUALITY
qualR2int4 Bitwise quality flag from R2 band detection -1 CODE_QUALITY
qualIint4 Bitwise quality flag from I band detection -1 CODE_QUALITY
blendBint4 Blend flag from B band detection -99999999 CODE_MULT_INDEX
blendR1int4 Blend flag from R1 band detection -99999999 CODE_MULT_INDEX
blendR2int4 Blend flag from R2 band detection -99999999 CODE_MULT_INDEX
blendIint4 Blend flag from I band detection -99999999 CODE_MULT_INDEX
prfStatBreal4N(0,1) Profile statistic from B band detection -0.99999995e9 CLASS_STAR/GALAXY
prfStatR1real4N(0,1) Profile statistic from R1 band detection -0.99999995e9 CLASS_STAR/GALAXY
prfStatR2real4N(0,1) Profile statistic from R2 band detection -0.99999995e9 CLASS_STAR/GALAXY
prfStatIreal4N(0,1) Profile statistic from I band detection -0.99999995e9 CLASS_STAR/GALAXY
lreal4degrees The Galactic longitude of the source  POS_GAL_LON
breal4degrees The Galactic latitude of the source  POS_GAL_LAT
dreal4degrees The great-circle distance of the source from the Galactic centre  POS_ANG_DIST_REL
Ebmvreal4mag The estimated foreground reddening at this position from Schlegel et al. (1998)  PHOT_EXTINCTION_GAL
Total length262

TABLE  Field

Survey field information for the SSA.

The whole-sky Schmidt photographic surveys were implemented using a system
of field centres defined over the surveyed areas. This table contains the
survey (SSA) and field number (eg. ESO/SRC, POSS-I) designations along
with the nominal field centre, size and spatial indexing attributes.

NameTypeLengthUnitDescriptionDefault ValueUnified Content Descriptor
systemIDtinyint1 Unique identifier of the system of survey field centres  ID_MAIN
fieldIDint4 Unique identifier of survey field (fieldNum and systemID combo)  ID_FIELD
fieldNumsmallint2 ESO/SRC or Palomar survey system field number  ID_FIELD
nominalRAfloat8degrees Nominal field centre RA  POS_EQ_RA_MAIN
nominalDecfloat8degrees Nominal field centre Dec  POS_EQ_DEC_MAIN
htmIdbigint8 Hierarchical Triangular Mesh (20-deep) of nominal field centre  POS_GENERAL
cxfloat8 Cartesian x of unit (ra,dec) vector on celestial sphere  POS_EQ_X
cyfloat8 Cartesian y of unit (ra,dec) vector on celestial sphere  POS_EQ_Y
czfloat8 Cartesian z of unit (ra,dec) vector on celestial sphere  POS_EQ_Z
Total length55

TABLE  IsoCalVersion

Information concerning all isophotal photometric calibrations in the SSA

Over the course of several implementations of the SuperCOSMOS Sky Survey,
several revised calibrations of the isophotal photometry have been done.
This table stores the calibration version numbers, start and end dates
relevant for those calibrations, and a short description for each version
of the isophotal photometry scale (note that this is not applicable to
point-like sources brighter than around 3 magnitudes above the respective
plate limits; in any case, the profile magnitude scale should be used for
point sources).

NameTypeLengthUnitDescriptionDefault ValueUnified Content Descriptor
versionIDtinyint1 Unique identifier for the calibration version  ID_VERSION
startDatedatetime16MM-DD-YYYY Start date at which the calibration was released 12-31-9999 TIME_DATE
endDatedatetime16MM-DD-YYYY End date at which the calibration was superseded 12-31-9999 TIME_DATE
descriptionvarchar256 Short description of the calibration version  REMARKS
Total length289

TABLE  PrevIsoCal

Previous isophotal photometric calibration coefficients for all plates

This table contains the gradient, zeropoint, "slump" (field-radius
dependent term) and colour offset (0.0 for Bj) coefficients for all
previous isophotal magnitude calibrations of each plate in the SSA.

NameTypeLengthUnitDescriptionDefault ValueUnified Content Descriptor
versionIDtinyint1 Unique identifier for the calibration version  ID_MAIN
plateIDint4 Unique identifier of the plate  ID_PLATE
gradientreal4mags per instrumental mag Gradient of the isophotal scale  MODEL_PARAM
zeropointreal4mags Zeropoint of the isophotal scale  PHOT_ZP
slumpreal4mags per (2.5 degrees)^4 Fourth-order radial term in calibration 0.0 MODEL_PARAM
colourZPreal4mags Colour zeropoint (wrt Bj) of calibration 0.0 MODEL_PARAM
Total length21

TABLE  CurrIsoCal

Current isophotal photometric calibration coefficients for all plates

This table contains the gradient, zeropoint, "slump" (field-radius
dependent term) and colour offset (0.0 for Bj) coefficients for all
current isophotal magnitude calibrations of each plate in the SSA.

NameTypeLengthUnitDescriptionDefault ValueUnified Content Descriptor
plateIDint4 Unique identifier of the plate  ID_PLATE
gradientreal4mags per instrumental mag Gradient of the isophotal scale  MODEL_PARAM
zeropointreal4mags Zeropoint of the isophotal scale  PHOT_ZP
slumpreal4mags per (2.5 degrees)^4 Fourth-order radial term in calibration 0.0 MODEL_PARAM
colourZPreal4mags Colour zeropoint (wrt Bj) of calibration 0.0 MODEL_PARAM
Total length20
Table of Galactic co-ordinates for the merged table Source.

This table contains a record for every row in the merged Source table.
Attributes are the source ID, followed by IAU 1958 Galactic co-ordinates
transformed from the J2000.0 RA & Dec (ie. the Galactic co-ordinates are
"l2" and "b2") and finally the great-circle distance from the Galactic
centre.