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Glossary of VULCAN attributes
This Glossary alphabetically lists all attributes used in the VULCANv20260525 database(s) held in the ASNIR. If you would like to have more information about the schema tables please use the VULCANv20260525 Schema Browser (other Browser versions).

A

B

C

D

E

F

G

H

I

J

K

L

M

N

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Z

K
Name	Schema Table	Database	Description	Type	Length	Unit	Default Value	Unified Content Descriptor
k1	catwise_2020, catwise_prelim	WISE	W1 photometry usage code (0: neither the ascending nor the descending scan provided a solution; 1: only the ascending scan provided a solution; 2: only the descending scan provided a solution; 3: both scans provided solutions which were combined in the relevant way)	int	4
k2	catwise_2020, catwise_prelim	WISE	W2 photometry usage code (0: neither the ascending nor the descending scan provided a solution; 1: only the ascending scan provided a solution; 2: only the descending scan provided a solution; 3: both scans provided solutions which were combined in the relevant way)	int	4
k_2mrat	twomass_scn	TWOMASS	Ks-band average 2nd image moment ratio.	real	4			stat.fit.param
k_2mrat	twomass_sixx2_scn	TWOMASS	K band average 2nd image moment ratio for scan	real	4
k_5sig_ba	twomass_xsc	TWOMASS	K minor/major axis ratio fit to the 5-sigma isophote.	real	4			phys.size.axisRatio
k_5sig_phi	twomass_xsc	TWOMASS	K angle to 5-sigma major axis (E of N).	smallint	2	degrees		stat.error
k_5surf	twomass_xsc	TWOMASS	K central surface brightness (r<=5).	real	4	mag		phot.mag.sb
k_ba	twomass_sixx2_xsc	TWOMASS	K minor/major axis ratio fit to the 3-sigma isophote	real	4
k_ba	twomass_xsc	TWOMASS	K minor/major axis ratio fit to the 3-sigma isophote.	real	4			phys.size.axisRatio
k_back	twomass_xsc	TWOMASS	K coadd median background.	real	4			meta.code
k_bisym_chi	twomass_xsc	TWOMASS	K bi-symmetric cross-correlation chi.	real	4			stat.fit.param
k_bisym_rat	twomass_xsc	TWOMASS	K bi-symmetric flux ratio.	real	4			phot.flux;arith.ratio
k_bndg_amp	twomass_xsc	TWOMASS	K banding maximum FT amplitude on this side of coadd.	real	4	DN		stat.fit.param
k_bndg_per	twomass_xsc	TWOMASS	K banding Fourier Transf. period on this side of coadd.	int	4	arcsec		stat.fit.param
k_chif_ellf	twomass_xsc	TWOMASS	K % chi-fraction for elliptical fit to 3-sig isophote.	real	4			stat.fit.param
k_cmsig	twomass_psc	TWOMASS	Corrected photometric uncertainty for the default Ks-band magnitude.	real	4	mag	Ks-band	phot.flux
k_con_indx	twomass_xsc	TWOMASS	K concentration index r_75%/r_25%.	real	4			phys.size;arith.ratio
k_d_area	twomass_xsc	TWOMASS	K 5-sigma to 3-sigma differential area.	smallint	2			stat.fit.residual
k_flg_10	twomass_xsc	TWOMASS	K confusion flag for 10 arcsec circular ap. mag.	smallint	2			meta.code
k_flg_15	twomass_xsc	TWOMASS	K confusion flag for 15 arcsec circular ap. mag.	smallint	2			meta.code
k_flg_20	twomass_xsc	TWOMASS	K confusion flag for 20 arcsec circular ap. mag.	smallint	2			meta.code
k_flg_25	twomass_xsc	TWOMASS	K confusion flag for 25 arcsec circular ap. mag.	smallint	2			meta.code
k_flg_30	twomass_xsc	TWOMASS	K confusion flag for 30 arcsec circular ap. mag.	smallint	2			meta.code
k_flg_40	twomass_xsc	TWOMASS	K confusion flag for 40 arcsec circular ap. mag.	smallint	2			meta.code
k_flg_5	twomass_xsc	TWOMASS	K confusion flag for 5 arcsec circular ap. mag.	smallint	2			meta.code
k_flg_50	twomass_xsc	TWOMASS	K confusion flag for 50 arcsec circular ap. mag.	smallint	2			meta.code
k_flg_60	twomass_xsc	TWOMASS	K confusion flag for 60 arcsec circular ap. mag.	smallint	2			meta.code
k_flg_7	twomass_sixx2_xsc	TWOMASS	K confusion flag for 7 arcsec circular ap. mag	smallint	2
k_flg_7	twomass_xsc	TWOMASS	K confusion flag for 7 arcsec circular ap. mag.	smallint	2			meta.code
k_flg_70	twomass_xsc	TWOMASS	K confusion flag for 70 arcsec circular ap. mag.	smallint	2			meta.code
k_flg_c	twomass_xsc	TWOMASS	K confusion flag for Kron circular mag.	smallint	2			meta.code
k_flg_e	twomass_xsc	TWOMASS	K confusion flag for Kron elliptical mag.	smallint	2			meta.code
k_flg_fc	twomass_xsc	TWOMASS	K confusion flag for fiducial Kron circ. mag.	smallint	2			meta.code
k_flg_fe	twomass_xsc	TWOMASS	K confusion flag for fiducial Kron ell. mag.	smallint	2			meta.code
k_flg_i20c	twomass_xsc	TWOMASS	K confusion flag for 20mag/sq." iso. circ. mag.	smallint	2			meta.code
k_flg_i20e	twomass_xsc	TWOMASS	K confusion flag for 20mag/sq." iso. ell. mag.	smallint	2			meta.code
k_flg_i21c	twomass_xsc	TWOMASS	K confusion flag for 21mag/sq." iso. circ. mag.	smallint	2			meta.code
k_flg_i21e	twomass_xsc	TWOMASS	K confusion flag for 21mag/sq." iso. ell. mag.	smallint	2			meta.code
k_flg_j21fc	twomass_xsc	TWOMASS	K confusion flag for 21mag/sq." iso. fid. circ. mag.	smallint	2			meta.code
k_flg_j21fe	twomass_xsc	TWOMASS	K confusion flag for 21mag/sq." iso. fid. ell. mag.	smallint	2			meta.code
k_flg_k20fc	twomass_xsc	TWOMASS	K confusion flag for 20mag/sq." iso. fid. circ. mag.	smallint	2			meta.code
k_flg_k20fe	twomass_sixx2_xsc	TWOMASS	K confusion flag for 20mag/sq.″ iso. fid. ell. mag	smallint	2
k_flg_k20fe	twomass_xsc	TWOMASS	K confusion flag for 20mag/sq." iso. fid. ell. mag.	smallint	2			meta.code
k_m	twomass_psc	TWOMASS	Default Ks-band magnitude	real	4	mag		phot.flux
k_m	twomass_sixx2_psc	TWOMASS	K selected "default" magnitude	real	4	mag
k_m_10	twomass_xsc	TWOMASS	K 10 arcsec radius circular aperture magnitude.	real	4	mag		phot.flux
k_m_15	twomass_xsc	TWOMASS	K 15 arcsec radius circular aperture magnitude.	real	4	mag		phot.flux
k_m_20	twomass_xsc	TWOMASS	K 20 arcsec radius circular aperture magnitude.	real	4	mag		phot.flux
k_m_25	twomass_xsc	TWOMASS	K 25 arcsec radius circular aperture magnitude.	real	4	mag		phot.flux
k_m_2mass	allwise_sc	WISE	2MASS Ks-band magnitude of the associated 2MASS PSC source. This column is "null" if there is no associated 2MASS PSC source or if the 2MASS PSC Ks-band magnitude entry is "null".	float	8	mag
k_m_2mass	wise_allskysc	WISE	2MASS Ks-band magnitude or magnitude upper limit of the associated 2MASS PSC source. This column is default if there is no associated 2MASS PSC source or if the 2MASS PSC Ks-band magnitude entry is default.	real	4	mag	-0.9999995e9
k_m_2mass	wise_prelimsc	WISE	2MASS Ks-band magnitude or magnitude upper limit of the associated 2MASS PSC source This column is default if there is no associated 2MASS PSC source or if the 2MASS PSC Ks-band magnitude entry is default	real	4	mag	-0.9999995e9
k_m_30	twomass_xsc	TWOMASS	K 30 arcsec radius circular aperture magnitude.	real	4	mag		phot.flux
k_m_40	twomass_xsc	TWOMASS	K 40 arcsec radius circular aperture magnitude.	real	4	mag		phot.flux
k_m_5	twomass_xsc	TWOMASS	K 5 arcsec radius circular aperture magnitude.	real	4	mag		phot.flux
k_m_50	twomass_xsc	TWOMASS	K 50 arcsec radius circular aperture magnitude.	real	4	mag		phot.flux
k_m_60	twomass_xsc	TWOMASS	K 60 arcsec radius circular aperture magnitude.	real	4	mag		phot.flux
k_m_7	twomass_sixx2_xsc	TWOMASS	K 7 arcsec radius circular aperture magnitude	real	4	mag
k_m_7	twomass_xsc	TWOMASS	K 7 arcsec radius circular aperture magnitude.	real	4	mag		phot.flux
k_m_70	twomass_xsc	TWOMASS	K 70 arcsec radius circular aperture magnitude.	real	4	mag		phot.flux
k_m_c	twomass_xsc	TWOMASS	K Kron circular aperture magnitude.	real	4	mag		phot.flux
k_m_e	twomass_xsc	TWOMASS	K Kron elliptical aperture magnitude.	real	4	mag		phot.flux
k_m_ext	twomass_sixx2_xsc	TWOMASS	K mag from fit extrapolation	real	4	mag
k_m_ext	twomass_xsc	TWOMASS	K mag from fit extrapolation.	real	4	mag		phot.flux
k_m_fc	twomass_xsc	TWOMASS	K fiducial Kron circular magnitude.	real	4	mag		phot.flux
k_m_fe	twomass_xsc	TWOMASS	K fiducial Kron ell. mag aperture magnitude.	real	4	mag		phot.flux
k_m_i20c	twomass_xsc	TWOMASS	K 20mag/sq." isophotal circular ap. magnitude.	real	4	mag		phot.flux
k_m_i20e	twomass_xsc	TWOMASS	K 20mag/sq." isophotal elliptical ap. magnitude.	real	4	mag		phot.flux
k_m_i21c	twomass_xsc	TWOMASS	K 21mag/sq." isophotal circular ap. magnitude.	real	4	mag		phot.flux
k_m_i21e	twomass_xsc	TWOMASS	K 21mag/sq." isophotal elliptical ap. magnitude.	real	4	mag		phot.flux
k_m_j21fc	twomass_xsc	TWOMASS	K 21mag/sq." isophotal fiducial circ. ap. mag.	real	4	mag		phot.flux
k_m_j21fe	twomass_xsc	TWOMASS	K 21mag/sq." isophotal fiducial ell. ap. magnitude.	real	4	mag		phot.flux
k_m_k20fc	twomass_xsc	TWOMASS	K 20mag/sq." isophotal fiducial circ. ap. mag.	real	4	mag		phot.flux
k_m_k20fe	twomass_sixx2_xsc	TWOMASS	K 20mag/sq.″ isophotal fiducial ell. ap. magnitude	real	4	mag
k_m_k20fe	twomass_xsc	TWOMASS	K 20mag/sq." isophotal fiducial ell. ap. magnitude.	real	4	mag		phot.flux
k_m_stdap	twomass_psc	TWOMASS	Ks-band "standard" aperture magnitude.	real	4	mag		phot.flux
k_m_sys	twomass_xsc	TWOMASS	K system photometry magnitude.	real	4	mag		phot.flux
k_mnsurfb_eff	twomass_xsc	TWOMASS	K mean surface brightness at the half-light radius.	real	4	mag		phot.mag.sb
k_msig	twomass_sixx2_psc	TWOMASS	K "default" mag uncertainty	real	4	mag
k_msig_10	twomass_xsc	TWOMASS	K 1-sigma uncertainty in 10 arcsec circular ap. mag.	real	4	mag		stat.error
k_msig_15	twomass_xsc	TWOMASS	K 1-sigma uncertainty in 15 arcsec circular ap. mag.	real	4	mag		stat.error
k_msig_20	twomass_xsc	TWOMASS	K 1-sigma uncertainty in 20 arcsec circular ap. mag.	real	4	mag		stat.error
k_msig_25	twomass_xsc	TWOMASS	K 1-sigma uncertainty in 25 arcsec circular ap. mag.	real	4	mag		stat.error
k_msig_2mass	allwise_sc	WISE	2MASS Ks-band corrected photometric uncertainty of the associated 2MASS PSC source. This column is "null" if there is no associated 2MASS PSC source or if the 2MASS PSC Ks-band uncertainty entry is "null".	float	8	mag
k_msig_2mass	wise_allskysc	WISE	2MASS Ks-band corrected photometric uncertainty of the associated 2MASS PSC source. This column is default if there is no associated 2MASS PSC source or if the 2MASS PSC Ks-band uncertainty entry is default.	real	4	mag	-0.9999995e9
k_msig_2mass	wise_prelimsc	WISE	2MASS Ks-band corrected photometric uncertainty of the associated 2MASS PSC source This column is default if there is no associated 2MASS PSC source or if the 2MASS PSC Ks-band uncertainty entry is default	real	4	mag	-0.9999995e9
k_msig_30	twomass_xsc	TWOMASS	K 1-sigma uncertainty in 30 arcsec circular ap. mag.	real	4	mag		stat.error
k_msig_40	twomass_xsc	TWOMASS	K 1-sigma uncertainty in 40 arcsec circular ap. mag.	real	4	mag		stat.error
k_msig_5	twomass_xsc	TWOMASS	K 1-sigma uncertainty in 5 arcsec circular ap. mag.	real	4	mag		stat.error
k_msig_50	twomass_xsc	TWOMASS	K 1-sigma uncertainty in 50 arcsec circular ap. mag.	real	4	mag		stat.error
k_msig_60	twomass_xsc	TWOMASS	K 1-sigma uncertainty in 60 arcsec circular ap. mag.	real	4	mag		stat.error
k_msig_7	twomass_sixx2_xsc	TWOMASS	K 1-sigma uncertainty in 7 arcsec circular ap. mag	real	4	mag
k_msig_7	twomass_xsc	TWOMASS	K 1-sigma uncertainty in 7 arcsec circular ap. mag.	real	4	mag		stat.error
k_msig_70	twomass_xsc	TWOMASS	K 1-sigma uncertainty in 70 arcsec circular ap. mag.	real	4	mag		stat.error
k_msig_c	twomass_xsc	TWOMASS	K 1-sigma uncertainty in Kron circular mag.	real	4	mag		stat.error
k_msig_e	twomass_xsc	TWOMASS	K 1-sigma uncertainty in Kron elliptical mag.	real	4	mag		stat.error
k_msig_ext	twomass_sixx2_xsc	TWOMASS	K 1-sigma uncertainty in mag from fit extrapolation	real	4	mag
k_msig_ext	twomass_xsc	TWOMASS	K 1-sigma uncertainty in mag from fit extrapolation.	real	4	mag		stat.error
k_msig_fc	twomass_xsc	TWOMASS	K 1-sigma uncertainty in fiducial Kron circ. mag.	real	4	mag		stat.error
k_msig_fe	twomass_xsc	TWOMASS	K 1-sigma uncertainty in fiducial Kron ell. mag.	real	4	mag		stat.error
k_msig_i20c	twomass_xsc	TWOMASS	K 1-sigma uncertainty in 20mag/sq." iso. circ. mag.	real	4	mag		stat.error
k_msig_i20e	twomass_xsc	TWOMASS	K 1-sigma uncertainty in 20mag/sq." iso. ell. mag.	real	4	mag		stat.error
k_msig_i21c	twomass_xsc	TWOMASS	K 1-sigma uncertainty in 21mag/sq." iso. circ. mag.	real	4	mag		stat.error
k_msig_i21e	twomass_xsc	TWOMASS	K 1-sigma uncertainty in 21mag/sq." iso. ell. mag.	real	4	mag		stat.error
k_msig_j21fc	twomass_xsc	TWOMASS	K 1-sigma uncertainty in 21mag/sq." iso.fid.circ.mag.	real	4	mag		stat.error
k_msig_j21fe	twomass_xsc	TWOMASS	K 1-sigma uncertainty in 21mag/sq." iso.fid.ell.mag.	real	4	mag		stat.error
k_msig_k20fc	twomass_xsc	TWOMASS	K 1-sigma uncertainty in 20mag/sq." iso.fid.circ. mag.	real	4	mag		stat.error
k_msig_k20fe	twomass_sixx2_xsc	TWOMASS	K 1-sigma uncertainty in 20mag/sq.″ iso.fid.ell.mag	real	4	mag
k_msig_k20fe	twomass_xsc	TWOMASS	K 1-sigma uncertainty in 20mag/sq." iso.fid.ell.mag.	real	4	mag		stat.error
k_msig_stdap	twomass_psc	TWOMASS	Uncertainty in the Ks-band standard aperture magnitude.	real	4	mag		phot.flux
k_msig_sys	twomass_xsc	TWOMASS	K 1-sigma uncertainty in system photometry mag.	real	4	mag		stat.error
k_msigcom	twomass_psc	TWOMASS	Combined, or total photometric uncertainty for the default Ks-band magnitude.	real	4	mag	Ks-band	phot.flux
k_msigcom	twomass_sixx2_psc	TWOMASS	combined (total) K band photometric uncertainty	real	4	mag
k_msnr10	twomass_scn	TWOMASS	The estimated Ks-band magnitude at which SNR=10 is achieved for this scan.	real	4	mag		phot.flux
k_msnr10	twomass_sixx2_scn	TWOMASS	K mag at which SNR=10 is achieved, from k_psp and k_zp_ap	real	4	mag
k_n_snr10	twomass_scn	TWOMASS	Number of point sources at Ks-band with SNR>10 (instrumental mag <=14.3)	int	4			meta.number
k_n_snr10	twomass_sixx2_scn	TWOMASS	number of K point sources with SNR>10 (instrumental m<=14.3)	int	4
k_pchi	twomass_xsc	TWOMASS	K chi^2 of fit to rad. profile (LCSB: alpha scale len).	real	4			stat.fit.param
k_peak	twomass_xsc	TWOMASS	K peak pixel brightness.	real	4	mag		phot.mag.sb
k_perc_darea	twomass_xsc	TWOMASS	K 5-sigma to 3-sigma percent area change.	smallint	2			FIT_PARAM
k_phi	twomass_sixx2_xsc	TWOMASS	K angle to 3-sigma major axis (E of N)	smallint	2	deg
k_phi	twomass_xsc	TWOMASS	K angle to 3-sigma major axis (E of N).	smallint	2	degrees		pos.posAng
k_psfchi	twomass_psc	TWOMASS	Reduced chi-squared goodness-of-fit value for the Ks-band profile-fit photometry made on the 1.3 s "Read_2" exposures.	real	4			stat.fit.param
k_psp	twomass_scn	TWOMASS	Ks-band photometric sensitivity paramater (PSP).	real	4			instr.sensitivity
k_psp	twomass_sixx2_scn	TWOMASS	K photometric sensitivity param: k_shape_avg*(k_fbg_avg^.29)	real	4
k_pts_noise	twomass_scn	TWOMASS	Base-10 logarithm of the mode of the noise distribution for all point source detections in the scan, where the noise is estimated from the measured Ks-band photometric errors and is expressed in units of mJy.	real	4			instr.det.noise
k_pts_noise	twomass_sixx2_scn	TWOMASS	log10 of K band modal point src noise estimate	real	4	logmJy
k_r_c	twomass_xsc	TWOMASS	K Kron circular aperture radius.	real	4	arcsec		phys.angSize;src
k_r_e	twomass_xsc	TWOMASS	K Kron elliptical aperture semi-major axis.	real	4	arcsec		phys.angSize;src
k_r_eff	twomass_xsc	TWOMASS	K half-light (integrated half-flux point) radius.	real	4	arcsec		phys.angSize;src
k_r_i20c	twomass_xsc	TWOMASS	K 20mag/sq." isophotal circular aperture radius.	real	4	arcsec		phys.angSize;src
k_r_i20e	twomass_xsc	TWOMASS	K 20mag/sq." isophotal elliptical ap. semi-major axis.	real	4	arcsec		phys.angSize;src
k_r_i21c	twomass_xsc	TWOMASS	K 21mag/sq." isophotal circular aperture radius.	real	4	arcsec		phys.angSize;src
k_r_i21e	twomass_xsc	TWOMASS	K 21mag/sq." isophotal elliptical ap. semi-major axis.	real	4	arcsec		phys.angSize;src
k_resid_ann	twomass_xsc	TWOMASS	K residual annulus background median.	real	4	DN		meta.code
k_sc_1mm	twomass_xsc	TWOMASS	K 1st moment (score) (LCSB: super blk 2,4,8 SNR).	real	4			meta.code
k_sc_2mm	twomass_xsc	TWOMASS	K 2nd moment (score) (LCSB: SNRMAX - super SNR max).	real	4			meta.code
k_sc_msh	twomass_xsc	TWOMASS	K median shape score.	real	4			meta.code
k_sc_mxdn	twomass_xsc	TWOMASS	K mxdn (score) (LCSB: BSNR - block/smoothed SNR).	real	4			meta.code
k_sc_r1	twomass_xsc	TWOMASS	K r1 (score).	real	4			meta.code
k_sc_r23	twomass_xsc	TWOMASS	K r23 (score) (LCSB: TSNR - integrated SNR for r=15).	real	4			meta.code
k_sc_sh	twomass_xsc	TWOMASS	K shape (score).	real	4			meta.code
k_sc_vint	twomass_xsc	TWOMASS	K vint (score).	real	4			meta.code
k_sc_wsh	twomass_xsc	TWOMASS	K wsh (score) (LCSB: PSNR - peak raw SNR).	real	4			meta.code
k_seetrack	twomass_xsc	TWOMASS	K band seetracking score.	real	4			meta.code
k_sh0	twomass_xsc	TWOMASS	K ridge shape (LCSB: BSNR limit).	real	4			FIT_PARAM
k_shape_avg	twomass_scn	TWOMASS	Ks-band average seeing shape for scan.	real	4			instr.obsty.seeing
k_shape_avg	twomass_sixx2_scn	TWOMASS	K band average seeing shape for scan	real	4
k_shape_rms	twomass_scn	TWOMASS	RMS-error of Ks-band average seeing shape.	real	4			instr.obsty.seeing
k_shape_rms	twomass_sixx2_scn	TWOMASS	rms of K band avg seeing shape for scan	real	4
k_sig_sh0	twomass_xsc	TWOMASS	K ridge shape sigma (LCSB: B2SNR limit).	real	4			FIT_PARAM
k_snr	twomass_psc	TWOMASS	Ks-band "scan" signal-to-noise ratio.	real	4	mag		instr.det.noise
k_snr	twomass_sixx2_psc	TWOMASS	K band "scan" signal-to-noise ratio	real	4
k_subst2	twomass_xsc	TWOMASS	K residual background #2 (score).	real	4			meta.code
k_zp_ap	twomass_scn	TWOMASS	Photometric zero-point for Ks-band aperture photometry.	real	4	mag		phot.mag;arith.zp
k_zp_ap	twomass_sixx2_scn	TWOMASS	K band ap. calibration photometric zero-point for scan	real	4	mag
k_zperr_ap	twomass_scn	TWOMASS	RMS-error of zero-point for Ks-band aperture photometry	real	4	mag		stat.error
k_zperr_ap	twomass_sixx2_scn	TWOMASS	K band ap. calibration rms error of zero-point for scan	real	4	mag
ka	catwise_2020, catwise_prelim	WISE	astrometry usage code (0: neither the ascending nor the descending scan provided a solution; 1: only the ascending scan provided a solution; 2: only the descending scan provided a solution; 3: both scans provided solutions which were combined in the relevant way)	int	4
kABMagLim	allSkyNIRFrameSetInfo	VULCANiDR	AB magnitude limit of pointing in K/Ks band	float	8	mag
kAllAperMag3	allSkyNIRSource	VULCANiDR	Default point source K/Ks aperture corrected mag (2.0 arcsec aperture diameter) using All Sky calibration If in doubt use this flux estimator	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
kAllAperMag3Err	allSkyNIRSource	VULCANiDR	Error in default point/extended source K/Ks mag (2.0 arcsec aperture diameter) using All Sky calibration	real	4	mag	-0.9999995e9	stat.error;phot.mag&MagUCD&
kAllAperMag4	allSkyNIRSource	VULCANiDR	Point source K/Ks aperture corrected mag (2.8 arcsec aperture diameter) using All Sky calibration	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
kAllAperMag4Err	allSkyNIRSource	VULCANiDR	Error in point/extended source K/Ks mag (2.8 arcsec aperture diameter) using All Sky calibration	real	4	mag	-0.9999995e9	stat.error;phot.mag&MagUCD&
kAllAperMag6	allSkyNIRSource	VULCANiDR	Point source K/Ks aperture corrected mag (5.7 arcsec aperture diameter) using All Sky calibration	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
kAllAperMag6Err	allSkyNIRSource	VULCANiDR	Error in point/extended source K/Ks mag (5.7 arcsec aperture diameter) using All Sky calibration	real	4	mag	-0.9999995e9	stat.error;phot.mag&MagUCD&
kAllAperMagNoAperCorr3	allSkyNIRSource	VULCANiDR	Default extended source K/Ks aperture mag (2.0 arcsec aperture diameter) using All Sky calibration If in doubt use this flux estimator	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
kAllAperMagNoAperCorr4	allSkyNIRSource	VULCANiDR	Extended source K/Ks aperture mag (2.8 arcsec aperture diameter) using All Sky calibration	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
kAllAperMagNoAperCorr6	allSkyNIRSource	VULCANiDR	Extended source K/Ks aperture mag (5.7 arcsec aperture diameter) using All Sky calibration	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
kAllPetroMag	allSkyNIRSource	VULCANiDR	Extended source K/Ks mag (Petrosian) using All Sky calibration	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
kAllPetroMagErr	allSkyNIRSource	VULCANiDR	Error in extended source K/Ks mag (Petrosian) using All Sky calibration	real	4	mag	-0.9999995e9	stat.error;phot.mag&MagUCD&
kClass	allSkyNIRSource	VULCANiDR	discrete image classification flag in K/Ks	smallint	2		-9999	src.class&MagUCD&
kClassStat	allSkyNIRSource	VULCANiDR	N(0,1) stellarness-of-profile statistic/SExtractor STAR_CLASS in K/Ks	real	4		-0.9999995e9	stat&MagUCD&
kEll	allSkyNIRSource	VULCANiDR	1-b/a, where a/b=semi-major/minor axes in K/Ks	real	4		-0.9999995e9	src.ellipticity&MagUCD&
keNum	allSkyNIRFrameSetInfo	VULCANiDR	the extension number of this K/Ks frame	tinyint	1			meta.number;em.IR.K
kErrBits	allSkyNIRSource	VULCANiDR	processing warning/error bitwise flags in K/Ks	int	4		-99999999	meta.code&MagUCD&
			Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.
kEta	allSkyNIRSource	VULCANiDR	Offset of K/Ks detection from master position (+north/-south)	real	4	arcsec	-0.9999995e9	pos.eq.dec;arith.diff&MagUCD&
			When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 2.0 (UKIDSS LAS and GPS; UHS; also non-survey programmes) or 1.0 (UKIDSS GPS, DXS and UDS) arcseconds is used, the higher value enabling pairing of moving sources when epoch separations may be several years. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the LAS, you might wish to insist that the offsets in the selected sample are all below 1 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.
kGausig	allSkyNIRSource	VULCANiDR	RMS of axes of ellipse fit in K/Ks	real	4	pixels	-0.9999995e9	src.morph.param&MagUCD&
kHlCorSMjRadAs	allSkyNIRSource	VULCANiDR	Seeing corrected half-light, semi-major axis in K/Ks band	real	4	arcsec	-0.9999995e9	phys.angSize;em.opt.I
km	catwise_2020, catwise_prelim	WISE	proper motion usage code (0: neither the ascending nor the descending scan provided a solution; 1: only the ascending scan provided a solution; 2: only the descending scan provided a solution; 3: both scans provided solutions which were combined in the relevant way)	int	4
kmfID	allSkyNIRFrameSetInfo	VULCANiDR	the UID of the relevant K/Ks multiframe	bigint	8			meta.id;obs.field;em.IR.K
kMjd	allSkyNIRSource	VULCANiDR	Modified Julian Day in K/Ks band	float	8	days	-0.9999995e9	time.epoch&MagUCD&
kNEpochs	allSkyNIRFrameSetInfo	VULCANiDR	Number of epochs in K/Ks band (0 if no measurements)	int	4
kObs	allSkyNIRSource	VULCANiDR	There are pixels at this position in the K/Ks-band	tinyint	1		0	meta.flag
kPA	allSkyNIRSource	VULCANiDR	ellipse fit celestial orientation in K/Ks	real	4	Degrees	-0.9999995e9	pos.posAng&MagUCD&
kppErrBits	allSkyNIRSource	VULCANiDR	additional WFAU post-processing error bits in K/Ks	int	4		0	meta.code&MagUCD&
			Post-processing error quality bit flags assigned (NB: from UKIDSS DR2 release onwards) in the WSA curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings: Byte Bit Detection quality issue Threshold or bit mask Applies to Decimal Hexadecimal 0 4 Deblended 16 0x00000010 All VDFS catalogues 0 6 Bad pixel(s) in default aperture 64 0x00000040 All VDFS catalogues 1 15 Source in poor flat field region 32768 0x00008000 All but mosaics 2 16 Close to saturated 65536 0x00010000 All VDFS catalogues (though deeps excluded prior to DR8) 2 17 Photometric calibration probably subject to systematic error 131072 0x00020000 GPS only 2 19 Possible crosstalk artefact/contamination 524288 0x00080000 All but GPS 2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 All but mosaics In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all K band sources in the LAS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.
kronFlux	Detection	PS1DR2	Kron (1980) flux.	real	4	Janskys	-999
kronFluxErr	Detection	PS1DR2	Error on Kron (1980) flux.	real	4	Janskys	-999
kronRad	Detection	PS1DR2	Kron (1980) radius.	real	4	arcsec	-999
kSeeing	allSkyNIRFrameSetInfo	VULCANiDR	Ks band seeing	float	8	arcsec
kSeqNum	allSkyNIRSource	VULCANiDR	the running number of the K/Ks detection	int	4		-99999999	meta.number&MagUCD&
kTelAperMag3	allSkyNIRSource	VULCANiDR	Default point source K/Ks aperture corrected mag (2.0 arcsec aperture diameter) using original calibration If in doubt use this flux estimator	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
kTelAperMag3Err	allSkyNIRSource	VULCANiDR	Error in default point/extended source K/Ks mag (2.0 arcsec aperture diameter) using original calibration	real	4	mag	-0.9999995e9	stat.error;phot.mag&MagUCD&
kTelAperMag4	allSkyNIRSource	VULCANiDR	Point source K/Ks aperture corrected mag (2.8 arcsec aperture diameter) using original calibration	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
kTelAperMag4Err	allSkyNIRSource	VULCANiDR	Error in point/extended source K/Ks mag (2.8 arcsec aperture diameter) using original calibration	real	4	mag	-0.9999995e9	stat.error;phot.mag&MagUCD&
kTelAperMag6	allSkyNIRSource	VULCANiDR	Point source K/Ks aperture corrected mag (5.7 arcsec aperture diameter) using original calibration	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
kTelAperMag6Err	allSkyNIRSource	VULCANiDR	Error in point/extended source K/Ks mag (5.7 arcsec aperture diameter) using original calibration	real	4	mag	-0.9999995e9	stat.error;phot.mag&MagUCD&
kTelAperMagNoAperCorr3	allSkyNIRSource	VULCANiDR	Default extended source K/Ks aperture mag (2.0 arcsec aperture diameter) using original calibration If in doubt use this flux estimator	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
kTelAperMagNoAperCorr4	allSkyNIRSource	VULCANiDR	Extended source K/Ks aperture mag (2.8 arcsec aperture diameter) using original calibration	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
kTelAperMagNoAperCorr6	allSkyNIRSource	VULCANiDR	Extended source K/Ks aperture mag (5.7 arcsec aperture diameter) using original calibration	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
kTelPetroMag	allSkyNIRSource	VULCANiDR	Extended source K/Ks mag (Petrosian) using original calibration	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
kTelPetroMagErr	allSkyNIRSource	VULCANiDR	Error in extended source K/Ks mag (Petrosian) using original calibration	real	4	mag	-0.9999995e9	stat.error;phot.mag&MagUCD&
kXi	allSkyNIRSource	VULCANiDR	Offset of K/Ks detection from master position (+east/-west)	real	4	arcsec	-0.9999995e9	pos.eq.ra;arith.diff&MagUCD&
			When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 2.0 (UKIDSS LAS and GPS; UHS; also non-survey programmes) or 1.0 (UKIDSS GPS, DXS and UDS) arcseconds is used, the higher value enabling pairing of moving sources when epoch separations may be several years. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the LAS, you might wish to insist that the offsets in the selected sample are all below 1 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. NB: the master position is the position of the detection in the shortest passband in the set, rather than the ra/dec of the source as stored in source attributes of the same name. The former is used in the pairing process, while the latter is generally the optimally weighted mean position from an astrometric solution or other combinatorial process of all individual detection positions across the available passbands.