TABLE  PreviousAstrometry

Contains previous astrometric calibration coefficients.

This table contains previous astrometric calibration coefficients for
each science detector frame that is a part of a multiframe.

Required constraints:
  • Primary key is (multiframeID,extNum,versNum)
  • (multiframeID,extNum) references MultiframeDetector(multiframeID,extNum)
  • (versNum,cuEventID) references AstrCalVers(versNum,cuEventID)

NameTypeLengthUnitDescriptionDefault ValueUnified Content Descriptor
multiframeIDbigint8 the UID of the relevant multiframe obs.field
extNumtinyint1 the extension number of this frame meta.number
versNumint4 Version number of current astrometric solution meta.software
cuEventIDint4 UID of curation event giving rise to this record meta.bib
cTypeXvarchar8 G&C WCS type, eg 'RA---ZPN' {image extension keyword: CTYPE1} pos.eq.ra;meta.main
cTypeYvarchar8 G&C WCS type, eg 'DEC--ZPN' {image extension keyword: CTYPE2} pos.eq.dec;meta.main
crValXfloat8 Coordinate value at reference point on axis 1 {image extension keyword: CRVAL1}-0.9999995e9pos.cartesian.x;instr.det
crValYfloat8 Coordinate value at reference point on axis 2 {image extension keyword: CRVAL2}-0.9999995e9pos.cartesian.y;instr.det
crUnit1varchar8 Unit of right ascension co-ordinates {image extension keyword: CRUNIT1}NONE 
crUnit2varchar8 Unit of declination co-ordinates {image extension keyword: CRUNIT2}NONE 
crPixXfloat8pixelsPixel coordinate of the reference point on axis 1 {image extension keyword: CRPIX1} pos.cartesian.x;instr.det
crPixYfloat8pixelsPixel coordinate of the reference point on axis 2 {image extension keyword: CRPIX2} pos.cartesian.y;instr.det
cd11float8 Element of the linear transformation matrix (with scale) {image extension keyword: CD1_1} pos.wcs.cdmatrix
cd21float8 Element of the linear transformation matrix (with scale) {image extension keyword: CD2_1} pos.wcs.cdmatrix
cd12float8 Element of the linear transformation matrix (with scale) {image extension keyword: CD1_2} pos.wcs.cdmatrix
cd22float8 Element of the linear transformation matrix (with scale) {image extension keyword: CD2_2} pos.wcs.cdmatrix
pv21 tooltipfloat8 Coefficient for r term (use only with ZPN projection) {image extension keyword: PV2_1}-0.9999995e9stat.fit.param
pv22 tooltipfloat8 Coefficient for r**2 term (use only with ZPN projection) {image extension keyword: PV2_2}-0.9999995e9stat.fit.param
pv23 tooltipfloat8 Coefficient for r**3 term (use only with ZPN projection) {image extension keyword: PV2_3}-0.9999995e9stat.fit.param
wcsPasstinyint1 Pass level of WCS {image extension keyword: WCSPASS}0pos.wcs
numRmsint4 No. of astrometric standards used in fit {image extension keyword: NUMBRMS}-99999999stat.fit.param
stdCRmsfloat8 RMS residual of fit to astrometric standards {image extension keyword: STDCRMS}-0.9999995e9stat.fit.residual
distortMapvarchar256 filename of 2d non-linear distortion mapNONEmeta.id;meta.file
centralRafloat8DegreesRA (J2000) at device centre-0.9999995e9pos.eq.ra;meta.main
centralDecfloat8DegreesDec (J2000) at device centre-0.9999995e9pos.eq.dec;meta.main
cxfloat8 unit vector of spherical co-ordinates of device centre pos.distance;pos.cartesian.x
cyfloat8 unit vector of spherical co-ordinates of device centre pos.distance;pos.cartesian.y
czfloat8 unit vector of spherical co-ordinates of device centre pos.distance;pos.cartesian.z
htmIDbigint8 Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates of device centre-99999999pos.eq
posAnglefloat8Degreesorientation of image x-axis to N-S-0.9999995e9pos.posAng
lfloat8DegreesGalactic longitude of device centre pos.galactic.lon
bfloat8DegreesGalactic latitude of device centre pos.galactic.lat
lambdafloat8DegreesSDSS system spherical co-ordinate 1 of device centre pos
etafloat8DegreesSDSS system spherical co-ordinate 2 of device centre pos
imageExtentreal4ArcminutesThe maximum angular extent from the central position-0.9999995e9pos.angDistance
minRafloat8DegreesThe minimum RA (J2000) on the device-0.9999995e9pos.eq.ra
minDecfloat8DegreesThe minimum Dec (J2000) on the device-0.9999995e9pos.eq.dec;meta.main
maxRafloat8DegreesThe maximum RA (J2000) on the device-0.9999995e9pos.eq.ra
maxDecfloat8DegreesThe maximum Dec (J2000) on the device-0.9999995e9pos.eq.dec;meta.main
xPixSizereal4ArcsecondsAngular size of pixels in X-0.9999995e9pos.angDistance
yPixSizereal4ArcsecondsAngular size of pixels in Y-0.9999995e9pos.angDistance
Total length538