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Glossary of WSA attributes
This Glossary alphabetically lists all attributes used in the UKIDSSDR5 database(s) held in the WSA. If you would like to have more information about the schema tables please use the UKIDSSDR5 Schema Browser (other Browser versions).

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D

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X
Name	Schema Table	Database	Description	Type	Length	Unit	Default Value	Unified Content Descriptor
x	UKIDSSDetection	WSA	X coordinate of detection	real	4	pixels		POS_PLATE_X
x	dxsDetection, dxsListRemeasurement, gcsDetection, gcsListRemeasurement, gpsDetection, gpsListRemeasurement, lasDetection, lasListRemeasurement, udsListRemeasurement	WSA	X coordinate of detection {catalogue TType keyword: X_coordinate} Intensity-weighted isophotal centre-of-gravity in X.	real	4	pixels		POS_PLATE_X
x	ptsDetection	WSATransit	X coordinate of detection {catalogue TType keyword: X_coordinate} Intensity-weighted isophotal centre-of-gravity in X.	real	4	pixels		POS_PLATE_X
x	udsDetection	WSA	X coordinate of detection (SE: X_IMAGE) {catalogue TType keyword: X_coordinate} Intensity-weighted isophotal centre-of-gravity in X.	real	4	pixels		POS_PLATE_X
x_coadd	twomass_xsc	2MASS	x (cross-scan) position (coadd coord.).	real	4	arcsec		INST_POS
X_IMAGE	mgcDetection	MGC	Object x position	real	4	pixel
X_OFF	mgcGalaxyStruct	MGC	X offset of Galaxy Centre	real	4		99.99
X_OFFm	mgcGalaxyStruct	MGC	X offset error (-)	real	4		99.99
X_OFFp	mgcGalaxyStruct	MGC	X offset error (+)	real	4		99.99
x_scan	twomass_psc	2MASS	Mean cross-scan focal plane position of the source in the Universal scan (U-scan) coordinate system.	real	4	arcsec		INST_POS
xCen	Detection	SSA	Intensity-weighted X-centroid of image	float	8	microns		POS_PLATE_X
xErr	UKIDSSDetection	WSA	Error in X coordinate	real	4	pixels		ERROR
xErr	dxsDetection, dxsListRemeasurement, gcsDetection, gcsListRemeasurement, gpsDetection, gpsListRemeasurement, lasDetection, lasListRemeasurement, udsListRemeasurement	WSA	Error in X coordinate {catalogue TType keyword: X_coordinate_err} Estimate of centroid error.	real	4	pixels		ERROR
xErr	ptsDetection	WSATransit	Error in X coordinate {catalogue TType keyword: X_coordinate_err} Estimate of centroid error.	real	4	pixels		ERROR
xErr	udsDetection	WSA	Error in X coordinate (SE: ERRX2_IMAGE½) {catalogue TType keyword: X_coordinate_err} Estimate of centroid error.	real	4	pixels		ERROR
xmax	Detection	SSA	Rightmost extent of image on plate	float	8	microns		POS_PLATE_X
xmin	Detection	SSA	Leftmost extent of image on plate	float	8	microns		POS_PLATE_X
xph	twomass_scn	2MASS	Special flag indicating whether or not another photometric problem, not obviously cloud related, was found in the scan after comparing its photometry to that of overlapping scans.	smallint	2			CODE_MISC
xPixSize	CurrentAstrometry	WSATransit	Angular size of pixels in X	real	4	Arcseconds	-0.9999995e9	POS_ANG_DIST_GENERAL
xPixSize	CurrentAstrometry, PreviousAstrometry	WSA	Angular size of pixels in X	real	4	Arcseconds	-0.9999995e9	POS_ANG_DIST_GENERAL
xPnt	Plate	SSA	Centre of scan area in X	real	4	microns		POS_PLATE_Y
xPos	nvssSource	NVSS	X position (RA direction) of the radio source	real	4	pixels		POS_CCD_X
xSize	MultiframeDetector	WSA	Corresponding image size (X); value only available if catalogue file exists {catalogue extension keyword:  NXOUT}	int	4		-99999999	NUMBER
xSize	MultiframeDetector	WSATransit	Corresponding image size (X); value only available if catalogue file exists {catalogue extension keyword:  NXOUT}	int	4		-99999999	NUMBER
xTalkFlag	MultiframeDetector	WSA	Xtalk flag, set if xtalk check has been done. {image extension keyword: XTALK}	varchar	32		NONE
xTalkFlag	MultiframeDetector	WSATransit	Xtalk flag, set if xtalk check has been done. {image extension keyword: XTALK}	varchar	32		NONE