Home | Browser | Access | Login | FreeSQL

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

O

P

Q

R

S

T

U

V

W

X

Y

Z

J
Name	Schema Table	Database	Description	Type	Length	Unit	Default Value	Unified Content Descriptor
j_2mrat	twomass_scn	TWOMASS	J-band average 2nd image moment ratio.	real	4			stat.fit.param
j_2mrat	twomass_sixx2_scn	TWOMASS	J band average 2nd image moment ratio for scan	real	4
j_5sig_ba	twomass_xsc	TWOMASS	J minor/major axis ratio fit to the 5-sigma isophote.	real	4			phys.size.axisRatio
j_5sig_phi	twomass_xsc	TWOMASS	J angle to 5-sigma major axis (E of N).	smallint	2	degrees		stat.error
j_5surf	twomass_xsc	TWOMASS	J central surface brightness (r<=5).	real	4	mag		phot.mag.sb
j_ba	twomass_xsc	TWOMASS	J minor/major axis ratio fit to the 3-sigma isophote.	real	4			phys.size.axisRatio
j_back	twomass_xsc	TWOMASS	J coadd median background.	real	4			meta.code
j_bisym_chi	twomass_xsc	TWOMASS	J bi-symmetric cross-correlation chi.	real	4			stat.fit.param
j_bisym_rat	twomass_xsc	TWOMASS	J bi-symmetric flux ratio.	real	4			phot.flux;arith.ratio
j_bndg_amp	twomass_xsc	TWOMASS	J banding maximum FT amplitude on this side of coadd.	real	4	DN		stat.fit.param
j_bndg_per	twomass_xsc	TWOMASS	J banding Fourier Transf. period on this side of coadd.	int	4	arcsec		stat.fit.param
j_chif_ellf	twomass_xsc	TWOMASS	J % chi-fraction for elliptical fit to 3-sig isophote.	real	4			stat.fit.param
j_cmsig	twomass_psc	TWOMASS	Corrected photometric uncertainty for the default J-band magnitude.	real	4	mag	J-band	phot.flux
j_con_indx	twomass_xsc	TWOMASS	J concentration index r_75%/r_25%.	real	4			phys.size;arith.ratio
j_d_area	twomass_xsc	TWOMASS	J 5-sigma to 3-sigma differential area.	smallint	2			stat.fit.residual
j_flg_10	twomass_xsc	TWOMASS	J confusion flag for 10 arcsec circular ap. mag.	smallint	2			meta.code
j_flg_15	twomass_xsc	TWOMASS	J confusion flag for 15 arcsec circular ap. mag.	smallint	2			meta.code
j_flg_20	twomass_xsc	TWOMASS	J confusion flag for 20 arcsec circular ap. mag.	smallint	2			meta.code
j_flg_25	twomass_xsc	TWOMASS	J confusion flag for 25 arcsec circular ap. mag.	smallint	2			meta.code
j_flg_30	twomass_xsc	TWOMASS	J confusion flag for 30 arcsec circular ap. mag.	smallint	2			meta.code
j_flg_40	twomass_xsc	TWOMASS	J confusion flag for 40 arcsec circular ap. mag.	smallint	2			meta.code
j_flg_5	twomass_xsc	TWOMASS	J confusion flag for 5 arcsec circular ap. mag.	smallint	2			meta.code
j_flg_50	twomass_xsc	TWOMASS	J confusion flag for 50 arcsec circular ap. mag.	smallint	2			meta.code
j_flg_60	twomass_xsc	TWOMASS	J confusion flag for 60 arcsec circular ap. mag.	smallint	2			meta.code
j_flg_7	twomass_sixx2_xsc	TWOMASS	J confusion flag for 7 arcsec circular ap. mag	smallint	2
j_flg_7	twomass_xsc	TWOMASS	J confusion flag for 7 arcsec circular ap. mag.	smallint	2			meta.code
j_flg_70	twomass_xsc	TWOMASS	J confusion flag for 70 arcsec circular ap. mag.	smallint	2			meta.code
j_flg_c	twomass_xsc	TWOMASS	J confusion flag for Kron circular mag.	smallint	2			meta.code
j_flg_e	twomass_xsc	TWOMASS	J confusion flag for Kron elliptical mag.	smallint	2			meta.code
j_flg_fc	twomass_xsc	TWOMASS	J confusion flag for fiducial Kron circ. mag.	smallint	2			meta.code
j_flg_fe	twomass_xsc	TWOMASS	J confusion flag for fiducial Kron ell. mag.	smallint	2			meta.code
j_flg_i20c	twomass_xsc	TWOMASS	J confusion flag for 20mag/sq." iso. circ. mag.	smallint	2			meta.code
j_flg_i20e	twomass_xsc	TWOMASS	J confusion flag for 20mag/sq." iso. ell. mag.	smallint	2			meta.code
j_flg_i21c	twomass_xsc	TWOMASS	J confusion flag for 21mag/sq." iso. circ. mag.	smallint	2			meta.code
j_flg_i21e	twomass_xsc	TWOMASS	J confusion flag for 21mag/sq." iso. ell. mag.	smallint	2			meta.code
j_flg_j21fc	twomass_xsc	TWOMASS	J confusion flag for 21mag/sq." iso. fid. circ. mag.	smallint	2			meta.code
j_flg_j21fe	twomass_xsc	TWOMASS	J confusion flag for 21mag/sq." iso. fid. ell. mag.	smallint	2			meta.code
j_flg_k20fc	twomass_xsc	TWOMASS	J confusion flag for 20mag/sq." iso. fid. circ. mag.	smallint	2			meta.code
j_flg_k20fe	twomass_sixx2_xsc	TWOMASS	J confusion flag for 20mag/sq.″ iso. fid. ell. mag	smallint	2
j_flg_k20fe	twomass_xsc	TWOMASS	J confusion flag for 20mag/sq." iso. fid. ell. mag.	smallint	2			meta.code
j_h	twomass_sixx2_psc	TWOMASS	The J-H color, computed from the J-band and H-band magnitudes (j_m and h_m, respectively) of the source. In cases where the first or second digit in rd_flg is equal to either "0", "4", "6", or "9", no color is computed because the photometry in one or both bands is of lower quality or the source is not detected.	real	4
j_k	twomass_sixx2_psc	TWOMASS	The J-Ks color, computed from the J-band and Ks-band magnitudes (j_m and k_m, respectively) of the source. In cases where the first or third digit in rd_flg is equal to either "0", "4", "6", or "9", no color is computed because the photometry in one or both bands is of lower quality or the source is not detected.	real	4
j_m	twomass_psc	TWOMASS	Default J-band magnitude	real	4	mag		phot.flux
j_m	twomass_sixx2_psc	TWOMASS	J selected "default" magnitude	real	4	mag
j_m_10	twomass_xsc	TWOMASS	J 10 arcsec radius circular aperture magnitude.	real	4	mag		phot.flux
j_m_15	twomass_xsc	TWOMASS	J 15 arcsec radius circular aperture magnitude.	real	4	mag		phot.flux
j_m_20	twomass_xsc	TWOMASS	J 20 arcsec radius circular aperture magnitude.	real	4	mag		phot.flux
j_m_25	twomass_xsc	TWOMASS	J 25 arcsec radius circular aperture magnitude.	real	4	mag		phot.flux
j_m_2mass	allwise_sc	WISE	2MASS J-band magnitude or magnitude upper limit of the associated 2MASS PSC source. This column is "null" if there is no associated 2MASS PSC source or if the 2MASS PSC J-band magnitude entry is "null".	float	8	mag
j_m_2mass	wise_allskysc	WISE	2MASS J-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 J-band magnitude entry is default.	real	4	mag	-0.9999995e9
j_m_2mass	wise_prelimsc	WISE	2MASS J-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 J-band magnitude entry is default	real	4	mag	-0.9999995e9
j_m_30	twomass_xsc	TWOMASS	J 30 arcsec radius circular aperture magnitude.	real	4	mag		phot.flux
j_m_40	twomass_xsc	TWOMASS	J 40 arcsec radius circular aperture magnitude.	real	4	mag		phot.flux
j_m_5	twomass_xsc	TWOMASS	J 5 arcsec radius circular aperture magnitude.	real	4	mag		phot.flux
j_m_50	twomass_xsc	TWOMASS	J 50 arcsec radius circular aperture magnitude.	real	4	mag		phot.flux
j_m_60	twomass_xsc	TWOMASS	J 60 arcsec radius circular aperture magnitude.	real	4	mag		phot.flux
j_m_7	twomass_sixx2_xsc	TWOMASS	J 7 arcsec radius circular aperture magnitude	real	4	mag
j_m_7	twomass_xsc	TWOMASS	J 7 arcsec radius circular aperture magnitude.	real	4	mag		phot.flux
j_m_70	twomass_xsc	TWOMASS	J 70 arcsec radius circular aperture magnitude.	real	4	mag		phot.flux
j_m_c	twomass_xsc	TWOMASS	J Kron circular aperture magnitude.	real	4	mag		phot.flux
j_m_e	twomass_xsc	TWOMASS	J Kron elliptical aperture magnitude.	real	4	mag		phot.flux
j_m_ext	twomass_sixx2_xsc	TWOMASS	J mag from fit extrapolation	real	4	mag
j_m_ext	twomass_xsc	TWOMASS	J mag from fit extrapolation.	real	4	mag		phot.flux
j_m_fc	twomass_xsc	TWOMASS	J fiducial Kron circular magnitude.	real	4	mag		phot.flux
j_m_fe	twomass_xsc	TWOMASS	J fiducial Kron ell. mag aperture magnitude.	real	4	mag		phot.flux
j_m_i20c	twomass_xsc	TWOMASS	J 20mag/sq." isophotal circular ap. magnitude.	real	4	mag		phot.flux
j_m_i20e	twomass_xsc	TWOMASS	J 20mag/sq." isophotal elliptical ap. magnitude.	real	4	mag		phot.flux
j_m_i21c	twomass_xsc	TWOMASS	J 21mag/sq." isophotal circular ap. magnitude.	real	4	mag		phot.flux
j_m_i21e	twomass_xsc	TWOMASS	J 21mag/sq." isophotal elliptical ap. magnitude.	real	4	mag		phot.flux
j_m_j21fc	twomass_xsc	TWOMASS	J 21mag/sq." isophotal fiducial circ. ap. mag.	real	4	mag		phot.flux
j_m_j21fe	twomass_xsc	TWOMASS	J 21mag/sq." isophotal fiducial ell. ap. magnitude.	real	4	mag		phot.flux
j_m_k20fc	twomass_xsc	TWOMASS	J 20mag/sq." isophotal fiducial circ. ap. mag.	real	4	mag		phot.flux
j_m_k20fe	twomass_sixx2_xsc	TWOMASS	J 20mag/sq.″ isophotal fiducial ell. ap. magnitude	real	4	mag
j_m_k20fe	twomass_xsc	TWOMASS	J 20mag/sq." isophotal fiducial ell. ap. magnitude.	real	4	mag		phot.flux
j_m_stdap	twomass_psc	TWOMASS	J-band "standard" aperture magnitude.	real	4	mag		phot.flux
j_m_sys	twomass_xsc	TWOMASS	J system photometry magnitude.	real	4	mag		phot.flux
j_mnsurfb_eff	twomass_xsc	TWOMASS	J mean surface brightness at the half-light radius.	real	4	mag		phot.mag.sb
j_msig	twomass_sixx2_psc	TWOMASS	J "default" mag uncertainty	real	4	mag
j_msig_10	twomass_xsc	TWOMASS	J 1-sigma uncertainty in 10 arcsec circular ap. mag.	real	4	mag		stat.error
j_msig_15	twomass_xsc	TWOMASS	J 1-sigma uncertainty in 15 arcsec circular ap. mag.	real	4	mag		stat.error
j_msig_20	twomass_xsc	TWOMASS	J 1-sigma uncertainty in 20 arcsec circular ap. mag.	real	4	mag		stat.error
j_msig_25	twomass_xsc	TWOMASS	J 1-sigma uncertainty in 25 arcsec circular ap. mag.	real	4	mag		stat.error
j_msig_2mass	allwise_sc	WISE	2MASS J-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 J-band uncertainty entry is "null".	float	8	mag
j_msig_2mass	wise_allskysc	WISE	2MASS J-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 J-band uncertainty entry is default.	real	4	mag	-0.9999995e9
j_msig_2mass	wise_prelimsc	WISE	2MASS J-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 J-band uncertainty entry is default	real	4	mag	-0.9999995e9
j_msig_30	twomass_xsc	TWOMASS	J 1-sigma uncertainty in 30 arcsec circular ap. mag.	real	4	mag		stat.error
j_msig_40	twomass_xsc	TWOMASS	J 1-sigma uncertainty in 40 arcsec circular ap. mag.	real	4	mag		stat.error
j_msig_5	twomass_xsc	TWOMASS	J 1-sigma uncertainty in 5 arcsec circular ap. mag.	real	4	mag		stat.error
j_msig_50	twomass_xsc	TWOMASS	J 1-sigma uncertainty in 50 arcsec circular ap. mag.	real	4	mag		stat.error
j_msig_60	twomass_xsc	TWOMASS	J 1-sigma uncertainty in 60 arcsec circular ap. mag.	real	4	mag		stat.error
j_msig_7	twomass_sixx2_xsc	TWOMASS	J 1-sigma uncertainty in 7 arcsec circular ap. mag	real	4	mag
j_msig_7	twomass_xsc	TWOMASS	J 1-sigma uncertainty in 7 arcsec circular ap. mag.	real	4	mag		stat.error
j_msig_70	twomass_xsc	TWOMASS	J 1-sigma uncertainty in 70 arcsec circular ap. mag.	real	4	mag		stat.error
j_msig_c	twomass_xsc	TWOMASS	J 1-sigma uncertainty in Kron circular mag.	real	4	mag		stat.error
j_msig_e	twomass_xsc	TWOMASS	J 1-sigma uncertainty in Kron elliptical mag.	real	4	mag		stat.error
j_msig_ext	twomass_sixx2_xsc	TWOMASS	J 1-sigma uncertainty in mag from fit extrapolation	real	4	mag
j_msig_ext	twomass_xsc	TWOMASS	J 1-sigma uncertainty in mag from fit extrapolation.	real	4	mag		stat.error
j_msig_fc	twomass_xsc	TWOMASS	J 1-sigma uncertainty in fiducial Kron circ. mag.	real	4	mag		stat.error
j_msig_fe	twomass_xsc	TWOMASS	J 1-sigma uncertainty in fiducial Kron ell. mag.	real	4	mag		stat.error
j_msig_i20c	twomass_xsc	TWOMASS	J 1-sigma uncertainty in 20mag/sq." iso. circ. mag.	real	4	mag		stat.error
j_msig_i20e	twomass_xsc	TWOMASS	J 1-sigma uncertainty in 20mag/sq." iso. ell. mag.	real	4	mag		stat.error
j_msig_i21c	twomass_xsc	TWOMASS	J 1-sigma uncertainty in 21mag/sq." iso. circ. mag.	real	4	mag		stat.error
j_msig_i21e	twomass_xsc	TWOMASS	J 1-sigma uncertainty in 21mag/sq." iso. ell. mag.	real	4	mag		stat.error
j_msig_j21fc	twomass_xsc	TWOMASS	J 1-sigma uncertainty in 21mag/sq." iso.fid.circ.mag.	real	4	mag		stat.error
j_msig_j21fe	twomass_xsc	TWOMASS	J 1-sigma uncertainty in 21mag/sq." iso.fid.ell.mag.	real	4	mag		stat.error
j_msig_k20fc	twomass_xsc	TWOMASS	J 1-sigma uncertainty in 20mag/sq." iso.fid.circ. mag.	real	4	mag		stat.error
j_msig_k20fe	twomass_xsc	TWOMASS	J 1-sigma uncertainty in 20mag/sq." iso.fid.ell.mag.	real	4	mag		stat.error
j_msig_stdap	twomass_psc	TWOMASS	Uncertainty in the J-band standard aperture magnitude.	real	4	mag		phot.flux
j_msig_sys	twomass_xsc	TWOMASS	J 1-sigma uncertainty in system photometry mag.	real	4	mag		stat.error
j_msigcom	twomass_psc	TWOMASS	Combined, or total photometric uncertainty for the default J-band magnitude.	real	4	mag	J-band	phot.flux
j_msigcom	twomass_sixx2_psc	TWOMASS	combined (total) J band photometric uncertainty	real	4	mag
j_msnr10	twomass_scn	TWOMASS	The estimated J-band magnitude at which SNR=10 is achieved for this scan.	real	4	mag		phot.flux
j_msnr10	twomass_sixx2_scn	TWOMASS	J mag at which SNR=10 is achieved, from j_psp and j_zp_ap	real	4	mag
j_n_snr10	twomass_scn	TWOMASS	Number of point sources at J-band with SNR>10 (instrumental mag <=15.8)	int	4			meta.number
j_n_snr10	twomass_sixx2_scn	TWOMASS	number of J point sources with SNR>10 (instrumental m<=15.8)	int	4
j_pchi	twomass_xsc	TWOMASS	J chi^2 of fit to rad. profile (LCSB: alpha scale len).	real	4			stat.fit.param
j_peak	twomass_xsc	TWOMASS	J peak pixel brightness.	real	4	mag		phot.mag.sb
j_perc_darea	twomass_xsc	TWOMASS	J 5-sigma to 3-sigma percent area change.	smallint	2			FIT_PARAM
j_phi	twomass_xsc	TWOMASS	J angle to 3-sigma major axis (E of N).	smallint	2	degrees		pos.posAng
j_psfchi	twomass_psc	TWOMASS	Reduced chi-squared goodness-of-fit value for the J-band profile-fit photometry made on the 1.3 s "Read_2" exposures.	real	4			stat.fit.param
j_psp	twomass_scn	TWOMASS	J-band photometric sensitivity paramater (PSP).	real	4			instr.sensitivity
j_psp	twomass_sixx2_scn	TWOMASS	J photometric sensitivity param: j_shape_avg*(j_fbg_avg^.29)	real	4
j_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 J-band photometric errors and is expressed in units of mJy.	real	4			instr.det.noise
j_pts_noise	twomass_sixx2_scn	TWOMASS	log10 of J band modal point src noise estimate	real	4	logmJy
j_r_c	twomass_xsc	TWOMASS	J Kron circular aperture radius.	real	4	arcsec		phys.angSize;src
j_r_e	twomass_xsc	TWOMASS	J Kron elliptical aperture semi-major axis.	real	4	arcsec		phys.angSize;src
j_r_eff	twomass_xsc	TWOMASS	J half-light (integrated half-flux point) radius.	real	4	arcsec		phys.angSize;src
j_r_i20c	twomass_xsc	TWOMASS	J 20mag/sq." isophotal circular aperture radius.	real	4	arcsec		phys.angSize;src
j_r_i20e	twomass_xsc	TWOMASS	J 20mag/sq." isophotal elliptical ap. semi-major axis.	real	4	arcsec		phys.angSize;src
j_r_i21c	twomass_xsc	TWOMASS	J 21mag/sq." isophotal circular aperture radius.	real	4	arcsec		phys.angSize;src
j_r_i21e	twomass_xsc	TWOMASS	J 21mag/sq." isophotal elliptical ap. semi-major axis.	real	4	arcsec		phys.angSize;src
j_resid_ann	twomass_xsc	TWOMASS	J residual annulus background median.	real	4	DN		meta.code
j_sc_1mm	twomass_xsc	TWOMASS	J 1st moment (score) (LCSB: super blk 2,4,8 SNR).	real	4			meta.code
j_sc_2mm	twomass_xsc	TWOMASS	J 2nd moment (score) (LCSB: SNRMAX - super SNR max).	real	4			meta.code
j_sc_msh	twomass_xsc	TWOMASS	J median shape score.	real	4			meta.code
j_sc_mxdn	twomass_xsc	TWOMASS	J mxdn (score) (LCSB: BSNR - block/smoothed SNR).	real	4			meta.code
j_sc_r1	twomass_xsc	TWOMASS	J r1 (score).	real	4			meta.code
j_sc_r23	twomass_xsc	TWOMASS	J r23 (score) (LCSB: TSNR - integrated SNR for r=15).	real	4			meta.code
j_sc_sh	twomass_xsc	TWOMASS	J shape (score).	real	4			meta.code
j_sc_vint	twomass_xsc	TWOMASS	J vint (score).	real	4			meta.code
j_sc_wsh	twomass_xsc	TWOMASS	J wsh (score) (LCSB: PSNR - peak raw SNR).	real	4			meta.code
j_seetrack	twomass_xsc	TWOMASS	J band seetracking score.	real	4			meta.code
j_sh0	twomass_xsc	TWOMASS	J ridge shape (LCSB: BSNR limit).	real	4			FIT_PARAM
j_shape_avg	twomass_scn	TWOMASS	J-band average seeing shape for scan.	real	4			instr.obsty.seeing
j_shape_avg	twomass_sixx2_scn	TWOMASS	J band average seeing shape for scan	real	4
j_shape_rms	twomass_scn	TWOMASS	RMS-error of J-band average seeing shape.	real	4			instr.obsty.seeing
j_shape_rms	twomass_sixx2_scn	TWOMASS	rms of J band avg seeing shape for scan	real	4
j_sig_sh0	twomass_xsc	TWOMASS	J ridge shape sigma (LCSB: B2SNR limit).	real	4			FIT_PARAM
j_snr	twomass_psc	TWOMASS	J-band "scan" signal-to-noise ratio.	real	4	mag		instr.det.noise
j_snr	twomass_sixx2_psc	TWOMASS	J band "scan" signal-to-noise ratio	real	4
j_subst2	twomass_xsc	TWOMASS	J residual background #2 (score).	real	4			meta.code
j_zp_ap	twomass_scn	TWOMASS	Photometric zero-point for J-band aperture photometry.	real	4	mag		phot.mag;arith.zp
j_zp_ap	twomass_sixx2_scn	TWOMASS	J band ap. calibration photometric zero-point for scan	real	4	mag
jABMagLim	allSkyNIRFrameSetInfo	VULCANiDR	AB magnitude limit of pointing in Y band	float	8	mag
jAllAperMag3	allSkyNIRSource	VULCANiDR	Default point source J 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&
jAllAperMag3Err	allSkyNIRSource	VULCANiDR	Error in default point/extended source J mag (2.0 arcsec aperture diameter) using All Sky calibration	real	4	mag	-0.9999995e9	stat.error;phot.mag&MagUCD&
jAllAperMag4	allSkyNIRSource	VULCANiDR	Point source J aperture corrected mag (2.8 arcsec aperture diameter) using All Sky calibration	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
jAllAperMag4Err	allSkyNIRSource	VULCANiDR	Error in point/extended source J mag (2.8 arcsec aperture diameter) using All Sky calibration	real	4	mag	-0.9999995e9	stat.error;phot.mag&MagUCD&
jAllAperMag6	allSkyNIRSource	VULCANiDR	Point source J aperture corrected mag (5.7 arcsec aperture diameter) using All Sky calibration	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
jAllAperMag6Err	allSkyNIRSource	VULCANiDR	Error in point/extended source J mag (5.7 arcsec aperture diameter) using All Sky calibration	real	4	mag	-0.9999995e9	stat.error;phot.mag&MagUCD&
jAllAperMagNoAperCorr3	allSkyNIRSource	VULCANiDR	Default extended source J 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&
jAllAperMagNoAperCorr4	allSkyNIRSource	VULCANiDR	Extended source J aperture mag (2.8 arcsec aperture diameter) using All Sky calibration	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
jAllAperMagNoAperCorr6	allSkyNIRSource	VULCANiDR	Extended source J aperture mag (5.7 arcsec aperture diameter) using All Sky calibration	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
jAllPetroMag	allSkyNIRSource	VULCANiDR	Extended source J mag (Petrosian) using All Sky calibration	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
jAllPetroMagErr	allSkyNIRSource	VULCANiDR	Error in extended source J mag (Petrosian) using All Sky calibration	real	4	mag	-0.9999995e9	stat.error;phot.mag&MagUCD&
jClass	allSkyNIRSource	VULCANiDR	discrete image classification flag in J	smallint	2		-9999	src.class&MagUCD&
jClassStat	allSkyNIRSource	VULCANiDR	N(0,1) stellarness-of-profile statistic/SExtractor STAR_CLASS in J	real	4		-0.9999995e9	stat&MagUCD&
jdate	twomass_psc	TWOMASS	The Julian Date of the source measurement accurate to +-30 seconds.	float	8	Julian days		time.epoch
jdate	twomass_scn	TWOMASS	Julian Date at beginning of scan.	float	8	Julian days		time.epoch
jdate	twomass_sixx2_psc	TWOMASS	julian date of source measurement to +/- 30 sec	float	8	jdate
jdate	twomass_sixx2_scn	TWOMASS	Julian date beginning UT of scan data	float	8	jdate
jdate	twomass_xsc	TWOMASS	Julian date of the source measurement accurate to +-3 minutes.	float	8	Julian days		time.epoch
jEll	allSkyNIRSource	VULCANiDR	1-b/a, where a/b=semi-major/minor axes in J	real	4		-0.9999995e9	src.ellipticity&MagUCD&
jeNum	allSkyNIRFrameSetInfo	VULCANiDR	the extension number of this J frame	tinyint	1			meta.number;em.IR.K
jErrBits	allSkyNIRSource	VULCANiDR	processing warning/error bitwise flags in J	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.
jEta	allSkyNIRSource	VULCANiDR	Offset of J 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.
jGausig	allSkyNIRSource	VULCANiDR	RMS of axes of ellipse fit in J	real	4	pixels	-0.9999995e9	src.morph.param&MagUCD&
jHlCorSMjRadAs	allSkyNIRSource	VULCANiDR	Seeing corrected half-light, semi-major axis in J band	real	4	arcsec	-0.9999995e9	phys.angSize;em.opt.I
jmfID	allSkyNIRFrameSetInfo	VULCANiDR	the UID of the relevant J multiframe	bigint	8			meta.id;obs.field;em.IR.K
jmhAllExt	allSkyNIRSource	VULCANiDR	Extended source colour J-H (using aperMagNoAperCorr3) for All Sky calibration	real	4	mag	-0.9999995e9	phot.color&ColorUCD&
			Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.
jmhAllExtErr	allSkyNIRSource	VULCANiDR	Error on extended source colour J-H for All Sky calibration	real	4	mag	-0.9999995e9	stat.error&ColorUCD&
			Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.
jmhAllPnt	allSkyNIRSource	VULCANiDR	Point source colour J-H (using aperMag3) for All Sky calibration	real	4	mag	-0.9999995e9	phot.color&ColorUCD&
			Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.
jmhAllPntErr	allSkyNIRSource	VULCANiDR	Error on point source colour J-H for All Sky calibration	real	4	mag	-0.9999995e9	stat.error&ColorUCD&
			Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.
jmhTelExt	allSkyNIRSource	VULCANiDR	Extended source colour J-H (using aperMagNoAperCorr3) for original calibration	real	4	mag	-0.9999995e9	phot.color&ColorUCD&
			Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.
jmhTelExtErr	allSkyNIRSource	VULCANiDR	Error on extended source colour J-H for original calibration	real	4	mag	-0.9999995e9	stat.error&ColorUCD&
			Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.
jmhTelPnt	allSkyNIRSource	VULCANiDR	Point source colour J-H (using aperMag3) for original calibration	real	4	mag	-0.9999995e9	phot.color&ColorUCD&
			Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.
jmhTelPntErr	allSkyNIRSource	VULCANiDR	Error on point source colour J-H for original calibration	real	4	mag	-0.9999995e9	stat.error&ColorUCD&
			Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.
jMjd	allSkyNIRSource	VULCANiDR	Modified Julian Day in J band	float	8	days	-0.9999995e9	time.epoch&MagUCD&
jmkAllExt	allSkyNIRSource	VULCANiDR	Extended source colour J-K/Ks (using aperMagNoAperCorr3) for All Sky calibration	real	4	mag	-0.9999995e9	phot.color&ColorUCD&
			Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.
jmkAllExtErr	allSkyNIRSource	VULCANiDR	Error on extended source colour J-K/Ks for All Sky calibration	real	4	mag	-0.9999995e9	stat.error&ColorUCD&
			Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.
jmkAllPnt	allSkyNIRSource	VULCANiDR	Point source colour J-K/Ks (using aperMag3) for All Sky calibration	real	4	mag	-0.9999995e9	phot.color&ColorUCD&
			Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.
jmkAllPntErr	allSkyNIRSource	VULCANiDR	Error on point source colour J-K/Ks for All Sky calibration	real	4	mag	-0.9999995e9	stat.error&ColorUCD&
			Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.
jmkTelExt	allSkyNIRSource	VULCANiDR	Extended source colour J-K/Ks (using aperMagNoAperCorr3) for original calibration	real	4	mag	-0.9999995e9	phot.color&ColorUCD&
			Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.
jmkTelExtErr	allSkyNIRSource	VULCANiDR	Error on extended source colour J-K/Ks for original calibration	real	4	mag	-0.9999995e9	stat.error&ColorUCD&
			Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.
jmkTelPnt	allSkyNIRSource	VULCANiDR	Point source colour J-K/Ks (using aperMag3) for original calibration	real	4	mag	-0.9999995e9	phot.color&ColorUCD&
			Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.
jmkTelPntErr	allSkyNIRSource	VULCANiDR	Error on point source colour J-K/Ks for original calibration	real	4	mag	-0.9999995e9	stat.error&ColorUCD&
			Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.
jNEpochs	allSkyNIRFrameSetInfo	VULCANiDR	Number of epochs in J band (0 if no measurements)	int	4
jObs	allSkyNIRSource	VULCANiDR	There pixels at this position in the J-band	tinyint	1		0	meta.flag
joinCriterion	RequiredNeighbours	VULCANiDR	the join criterion (search radius for matches)	real	4	degrees		??
jPA	allSkyNIRSource	VULCANiDR	ellipse fit celestial orientation in J	real	4	Degrees	-0.9999995e9	pos.posAng&MagUCD&
jppErrBits	allSkyNIRSource	VULCANiDR	additional WFAU post-processing error bits in J	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.
jSeeing	allSkyNIRFrameSetInfo	VULCANiDR	J band seeing	float	8	arcsec
jSeqNum	allSkyNIRSource	VULCANiDR	the running number of the J detection	int	4		-99999999	meta.number&MagUCD&
jTelAperMag3	allSkyNIRSource	VULCANiDR	Default point source J 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&
jTelAperMag3Err	allSkyNIRSource	VULCANiDR	Error in default point/extended source J mag (2.0 arcsec aperture diameter) using original calibration	real	4	mag	-0.9999995e9	stat.error;phot.mag&MagUCD&
jTelAperMag4	allSkyNIRSource	VULCANiDR	Point source J aperture corrected mag (2.8 arcsec aperture diameter) using original calibration	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
jTelAperMag4Err	allSkyNIRSource	VULCANiDR	Error in point/extended source J mag (2.8 arcsec aperture diameter) using original calibration	real	4	mag	-0.9999995e9	stat.error;phot.mag&MagUCD&
jTelAperMag6	allSkyNIRSource	VULCANiDR	Point source J aperture corrected mag (5.7 arcsec aperture diameter) using original calibration	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
jTelAperMag6Err	allSkyNIRSource	VULCANiDR	Error in point/extended source J mag (5.7 arcsec aperture diameter) using original calibration	real	4	mag	-0.9999995e9	stat.error;phot.mag&MagUCD&
jTelAperMagNoAperCorr3	allSkyNIRSource	VULCANiDR	Default extended source J 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&
jTelAperMagNoAperCorr4	allSkyNIRSource	VULCANiDR	Extended source J aperture mag (2.8 arcsec aperture diameter) using original calibration	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
jTelAperMagNoAperCorr6	allSkyNIRSource	VULCANiDR	Extended source J aperture mag (5.7 arcsec aperture diameter) using original calibration	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
jTelPetroMag	allSkyNIRSource	VULCANiDR	Extended source J mag (Petrosian) using original calibration	real	4	mag	-0.9999995e9	phot.mag&MagUCD&
jTelPetroMagErr	allSkyNIRSource	VULCANiDR	Error in extended source J mag (Petrosian) using original calibration	real	4	mag	-0.9999995e9	stat.error;phot.mag&MagUCD&
jXi	allSkyNIRSource	VULCANiDR	Offset of J 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.