VizieR

CfA VizieR . ADAC VizieR . CADC VizieR . Cambridge (UK) VizieR . IUCAA VizieR . Beijing (Ch) VizieR .

VizieR

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VII/289/dr16q SDSS quasar catalog, sixteenth data release (DR16Q) (Lyke+, 2020)
The SDSS quasar-only catalog from DR16 (DR16Q) (original column names in green) (750414 rows)
  recno=74936
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ColumnValue  Explain   (UCD)
_RAJ200001 21 56.85840 "h:m:s" Right ascension (FK5, Equinox=J2000.0) at Epoch=J2000, proper motions taken into account (pos.eq.ra)
_DEJ2000+04 22 24.8450 "d:m:s" Declination (FK5, Equinox=J2000.0) at Epoch=J2000, proper motions taken into account (pos.eq.dec)
_RAB195001 19 21.39213 "h:m:s" Right ascension (FK4, Equinox=B1950.0) at Epoch=J1950, proper motions taken into account (pos.eq.ra)
_DEB1950+04 06 43.9720 "d:m:s" Declination (FK4, Equinox=B1950.0) at Epoch=J1950, proper motions taken into account (pos.eq.dec)
_Glon137.25055813 deg Galactic longitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lon)
_Glat-57.64751456 deg Galactic latitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lat)
74936recno 74936  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

SDSS_NAME012156.85+042224.8  (i) SDSS-DR16 designation (HHMMSS.ss+DDMMSS.s; J2000) (SDSS_NAME) (meta.id;meta.main)
RA020.486910 deg (i) Right Ascension (J2000) (RA) (pos.eq.ra;meta.main)
DEC+04.373568 deg (i) [-17.53/84.44] Declination (J2000) (DEC) (pos.eq.dec;meta.main)
Plate 8760  Spectroscopic plate number (Note G1)   (obs.field)
MJD57672  (i) [51608/58543] Spectroscopic Modified Julian Date (Note G1)   (time.epoch)
FIBERID 993  Spectroscopic fiber number (FIBERID) (Note G1)   (meta.number;pos.parallax.spect)
AUTOCLASS_PQNQSO  Object classification post-QuasarNET (Busca & Balland 2018arXiv180809955B) (AUTOCLASS_PQN) (Note 1)   (meta.code)
AUTOCLASS_DR14QQSO  Object classification based only on the DR14Q algorithm (AUTOCLASS_DR14Q) (meta.code.class;src.class)
IS_QSO_QN 1  Binary flag for QuasarNET quasar identification (1=QSO; -1=not processed by QuasarNET) (IS_QSO_QN) (meta.code)
Z_QN 0.634617   [-0.4/6.51] Redshift derived by QuasarNET (Z_QN) (src.redshift;pos.heliocentric)
RANDOM_SELECT0   [0/1] Binary flag indicating objects selected for random visual inspection (0=not selected) (RANDOM_SELECT) (Note G2)   (meta.code)
Z_10K    [0.1/4.3] Redshift from visual inspection of random set (Z_10K) (src.redshift;pos.heliocentric)
Z_CONF_10K-1   [-1/3] Confidence rating for visual inspection redshift of random set (3:highest confidence) (Z_CONF_10K) (Note G3)   (meta.code)
PIPE_CORR_10K-1  Binary flag indicating if the automated pipeline classification and redshift were correct in the random set (PIPE_CORR_10K) (Note G4)   (meta.code)
IS_QSO_10K-1  Binary flag for random set quasar identification (1=QSO; -1=not randomly selected) (IS_QSO_10K) (meta.code)
THING_ID148950339   SDSS identifier mainly for BOSS and eBOSS objects (THING_ID) (meta.id)
Z_VI    [0.001/7.02] Redshift from visual inspection (Z_VI) (src.redshift;pos.heliocentric)
Z_CONF 0   [-1/3] Confidence rating for visual inspection redshift (3: highest confidence) (Z_CONF) (meta.code)
CLASS_PERSON 0   [0/50] Object classification from visual inspection (CLASS_PERSON) (Note 2)   (meta.code.class;src.class)
Z_DR12Q    [0.04/6.5] Redshift taken from DR12Q (Cat. VII/279) visual inspection (Z_DR12Q) (src.redshift;pos.heliocentric)
IS_QSO_DR12Q 0  Flag indicating if an object was a quasar in DR12Q (1=QSO) (IS_QSO_DR12Q) (meta.code)
Z_DR7Q_SCH    [0.06/5.47] Redshift taken from DR7Q (Cat. VII/260) catalog (Z_DR7Q_SCH) (src.redshift;pos.heliocentric)
IS_QSO_DR7Q-1  Flag indicating if an object was a quasar in DR7Q (IS_QSO_DR7Q) (meta.code)
Z_DR6Q_HW    [0.07/5.5] Redshift taken from DR6 (Hewett & Wild, 2010, J/MNRAS/405/2302) (Z_DR6Q_HW) (src.redshift;pos.heliocentric)
Z_DR7Q_HW    [0.06/5.5] Redshift taken from DR7 (Shen+ 2011, J/ApJS/194/45) catalog ancillary columns (Z_DR7Q_HW) (Note G5)   (src.redshift;pos.heliocentric)
IS_QSO_FINAL1   [1/2] Flag indicating quasars included in final catalog (1=QSO; 2=questionable – see Section 3.6) (IS_QSO_FINAL) (meta.code)
z 0.636479   [-0.0027/7.03] Best available redshift (src.redshift;pos.heliocentric)
SOURCE_ZPIPE  Source for redshift z (SOURCE_Z) (Note 3)   (meta.ref;pos.frame)
Z_PIPE 0.636479   [-0.0084/7.05] Redshift from SDSS pipeline version v5130 (Z_PIPE) (src.redshift;pos.heliocentric)
ZWARNING 0   [-1/68] Quality flag on SDSS pipeline redshift estimate (ZWARNING) (G6) Binary flag (Note)   (meta.code.qual)
objID1237678622236279028  SDSS object identification number (sky version, run, rerun, camera column, field number, and ID) (Note G7)   (meta.id)
Z_PCA 0.636538   [-1008/7.3] PCA redshift derived by the redvsblue algorithm (Z_PCA) (src.redshift;pos.heliocentric)
ZWARN_PCA 0   [0/1056] Warning flag for redvsblue redshift (ZWARN_PCA) (G6) Binary flag (Note)   (meta.code.qual)
DELTACHI2_PCA 1.37021e+04   [7/3.31e+7] Δχ2 for PCA redshift versus cubic continuum fit (DELTACHI2_PCA) (stat.fit.chi2)
Z_HALPHA    [-0.015/0.53] PCA line redshift for Hα from redvsblue (Z_HALPHA) (src.redshift;pos.heliocentric)
ZWARN_HALPHA7682   [0/7682] Warning flag for Hα (ZWARN_HALPHA) (G6) Binary flag (Note)   (meta.code.qual)
DELTACHI2_HALPHA 0.00000e+00   [0/2.2e+6] Δχ2 for Hα line redshift versus cubic continuum fit (DELTACHI2_HALPHA) (stat.fit.chi2)
Z_HBETA 0.636787   [-0.02/1.1] PCA line redshift for Hβ from redvsblue (Z_HBETA) (src.redshift;pos.heliocentric)
ZWARN_HBETA 0   [0/7682] Warning flag for Hβ (ZWARN_HBETA) (G6) Binary flag (Note)   (meta.code.qual)
DELTACHI2_HBETA 3.94986e+02   [0/525536] Δχ2 for Hβ line versus cubic continuum fit (DELTACHI2_HBETA) (stat.fit.chi2)
Z_MGII 0.636406   [0.28/2.6] PCA line redshift for MgII from redvsblue (Z_MGII) (src.redshift;pos.heliocentric)
ZWARN_MGII 0   [0/7682] Warning flag for MgII (ZWARN_MGII) (G6) Binary flag (Note)   (meta.code.qual)
DELTACHI2_MGII 2.00749e+03   [0/384079] Δχ2 for MgII line redshift versus cubic continuum fit (DELTACHI2_MGII) (stat.fit.chi2)
Z_CIII    [0.8/4.3] PCA line redshift for CIII] from redvsblue (Z_CIII) (src.redshift;pos.heliocentric)
ZWARN_CIII7682   [0/7682] Warning flag for CIII] (ZWARN_CIII) (G6) Binary flag (Note)   (meta.code.qual)
DELTACHI2_CIII 0.00000e+00   [0/547655] Δχ2 for CIII] line redshift versus cubic continuum fit (DELTACHI2_CIII) (stat.fit.chi2)
Z_CIV    [1.3/5.5] PCA line redshift for CIV from redvsblue (Z_CIV) (src.redshift;pos.heliocentric)
ZWARN_CIV7682   [0/7682] Warning flag for CIV (ZWARN_CIV) (G6) Binary flag (Note)   (meta.code.qual)
DELTACHI2_CIV 0.00000e+00   [0/5.5e+6] Δχ2 for CIV line redshift versus cubic continuum fit (DELTACHI2_CIV) (stat.fit.chi2)
Z_LYA    [1.9/7.3] PCA line redshift for Lyα from redvsblue (Z_LYA) (src.redshift;pos.heliocentric)
ZWARN_LYA7682   [0/7682] Warning flag for Lyα (ZWARN_LYA) (G6) Binary flag (Note)   (meta.code.qual)
DELTACHI2_LYA 0.00000e+00   [0/4.5e+6] Δχ2 for Lyα line redshift versus cubic continuum fit (DELTACHI2_LYA) (stat.fit.chi2)
Z_LYAWG 0.636539   [0.03/4] PCA redshift derived from spectra masked blueward of Lyα (Z_LYAWG) (src.redshift;pos.heliocentric)
Z_DLA1    [1.9/6.2] Redshift for damped Lyα feature 1 (Z_DLA1) (src.redshift;pos.heliocentric)
Z_DLA2    [2/5.2] Redshift for damped Lyα feature 2 (Z_DLA2) (src.redshift;pos.heliocentric)
Z_DLA3    [2.1/4.9] Redshift for damped Lyα feature 3 (Z_DLA3) (src.redshift;pos.heliocentric)
Z_DLA4    [2.4/3.7] Redshift for damped Lyα feature 4 (Z_DLA4) (src.redshift;pos.heliocentric)
Z_DLA5    [2.8/3.3] Redshift for damped Lyα feature 5 (Z_DLA5) (src.redshift;pos.heliocentric)
NHI_DLA1  [-] [20.3/22] Absorber column density for damped Lyα feature 1 (NHI_DLA1) (phys.columnDensity)
NHI_DLA2  [-] [20.3/21.8] Absorber column density for damped Lyα feature 2 (NHI_DLA2) (phys.columnDensity)
NHI_DLA3  [-] [20.3/21.4] Absorber column density for damped Lyα feature 3 (NHI_DLA3) (phys.columnDensity)
NHI_DLA4  [-] [20.3/21.1] Absorber column density for damped Lyα feature 4 (NHI_DLA4) (phys.columnDensity)
NHI_DLA5  [-] [20.5/20.6] Absorber column density for damped Lyα feature 5 (NHI_DLA5) (phys.columnDensity)
CONF_DLA1-1.0000  Confidence of detection for damped Lyα feature 1 (CONF_DLA1) (meta.code)
CONF_DLA2-1.0000  Confidence of detection for damped Lyα features (CONF_DLA2) (meta.code)
CONF_DLA3-1.0000  Confidence of detection for damped Lyα features (CONF_DLA3) (meta.code)
CONF_DLA4-1.0000  Confidence of detection for damped Lyα features (CONF_DLA4) (meta.code)
CONF_DLA5-1.0000  Confidence of detection for damped Lyα features (CONF_DLA5) (meta.code)
BAL_PROB-1.000000   [-1/1] BAL probability (BAL_PROB) (Note G8)   (stat.fit.goodness)
BI_CIV  km/s [/109061] BALnicity index for the CIV region (BI_CIV) (spect.line.eqWidth)
ERR_BI_CIV  km/s [0/3.1e+38] BI(CIV) uncertainty (ERR_BI_CIV) (stat.error)
AI_CIV  km/s [-618/121609] Absorption index for the CIV region (AI_CIV) (spect.index)
ERR_AI_CIV  km/s [0/10897] AI(CIV) uncertainty (ERR_AI_CIV) (stat.error)
BI_SIIV  km/s [/85220] BALnicity index for the SiIV region (BI_SIIV) (spect.line.eqWidth)
ERR_BI_SIIV  km/s [0/1985] BI(SIIV) uncertainty (ERR_BI_SIIV) (stat.error)
AI_SIIV  km/s [/45671] Absorption index for the SiIV region (AI_SIIV) (spect.index)
ERR_AI_SIIV  km/s [0/1622] AI(SIIV) uncertainty (ERR_AI_SIIV) (stat.error)
BOSS_TARGET1 0  BOSS target selection flag for the main survey (BOSS_TARGET1) Binary flag (meta.code)
EBOSS_TARGET0 0  eBOSS target selection flag for the pilot survey (SEQUELS) (EBOSS_TARGET0) Binary flag (meta.code)
EBOSS_TARGET1 3221241856  eBOSS target selection flag for the main survey (EBOSS_TARGET1) Binary flag (meta.code)
EBOSS_TARGET2 2147483665  eBOSS target 2 selection flag for the main survey (EBOSS_TARGET2) Binary flag (meta.code)
ANCILLARY_TARGET1 0  BOSS target selection flag for the ancillary surveys (ANCILLARY_TARGET1) Binary flag (meta.code)
ANCILLARY_TARGET2 0  BOSS target 2 selection flag for the ancillary surveys (ANCILLARY_TARGET2) (meta.code)
NSPEC_SDSS0   [0/1] Number of additional spectra from SDSS-I/II (NSPEC_SDSS) (Note G9)   (meta.number)
NSPEC_BOSS 0   [0/73] Number of additional spectra from BOSS/eBOSS (NSPEC_BOSS) (Note G9)   (meta.number)
NSPEC 0   [0/73] Total number of additional spectra (NSPEC) (Note G9)   (meta.number)
SKYVERSION2   [2] SDSS photometric sky version number (SKYVERSION) (meta.number)
RUN_NUMBER7718   [94/8162] SDSS imaging run number of photometric measurements (RUN_NUMBER) (meta.id)
RERUN_NUMBER301   [157/301] SDSS photometric processing rerun number (RERUN_NUMBER) (meta.id)
CAMCOL_NUMBER2   [1/6] SDSS camera column number (CAMCOL_NUMBER) (meta.id)
FIELD_NUMBER125   [11/872] SDSS field number (FIELD_NUMBER) (meta.id;obs.field)
ID_NUMBER 244   [2/4093] SDSS photometric ID (ID_NUMBER) (meta.id;phot)
LAMBDA_EFF5400 0.1nm [4000/7500] Wavelength for which the fiber placement was optimized to account for atmospheric differential refraction (Dawson+ 2013AJ....145...10D), in Å (LAMBDA_EFF) (em.wl)
ZOFFSET 0.000000 um [0/300] Backstopping offset distance (ZOFFSET) (pos.distance;instr.offset;arith.diff)
Xfocal 279.213623 mm [-325/325] Hole x-axis position in focal plane (pos.cartesian.x;instr.plate)
Yfocal 78.283928 mm [-325/326] Hole y-axis position in focal plane (pos.cartesian.y;instr.plate)
Chunkeboss9  Name of tiling chunk (from the plate-list product) (obs.field)
Tile 16098   [-3/17691] Tile number (obs.field)
PLATESN2 13.477900   [0/334] Overall (S/N)2 measure for plate, minimum of all four cameras (PLATESN2) (stat.snr)
PSFFLUXu 5.471925 3.63uJy [-45/2001] PSF flux in u-band in nMgy (not corrected for Galactic extinction) (PSFFLUXu) (phot.mag;em.opt.U)
PSFFLUXg 9.764647 3.63uJy [-0.3/1756] PSF flux in g-band in nMgy (not corrected for Galactic extinction) (PSFFLUXg) (phot.mag;em.opt.B)
PSFFLUXr 9.869002 3.63uJy [-0.6/1646] PSF flux in r-band in nMgy (not corrected for Galactic extinction) (PSFFLUXr) (phot.mag;em.opt.R)
PSFFLUXi 13.110202 3.63uJy [-31/2324] PSF flux in i-band in nMgy (not corrected for Galactic extinction) (PSFFLUXi) (phot.mag;em.opt.I)
PSFFLUXz 14.771604 3.63uJy [-3.2/1777] PSF flux in z-band in nMgy (not corrected for Galactic extinction) (PSFFLUXz) (phot.mag;em.opt.I)
PSFFLUX_IVARu 7.505538 3.63uJy [0/233] Inverse variance of Fu in nMgy (PSFFLUX_IVARu) (phot.mag;em.opt.U)
PSFFLUX_IVARg 15.583539 3.63uJy [0/643] Inverse variance of Fg in nMgy (PSFFLUX_IVARg) (phot.mag;em.opt.B)
PSFFLUX_IVARr 28.344624 3.63uJy [0/160] Inverse variance of Fr in nMgy (PSFFLUX_IVARr) (phot.mag;em.opt.R)
PSFFLUX_IVARi 6.898448 3.63uJy [0/74] Inverse variance of Fi in nMgy (PSFFLUX_IVARi) (phot.mag;em.opt.I)
PSFFLUX_IVARz 1.108588 3.63uJy [0/9] Inverse variance of Fz in nMgy (PSFFLUX_IVARz) (phot.mag;em.opt.I)
PSFMAGu 20.6539 mag [14.2/31] PSF (AB) magnitude in u band (not corrected for Galactic extinction) (PSFMAGu) (phot.mag;em.opt.U)
PSFMAGg 20.0258 mag [14.3/26.4] PSF (AB) magnitude in g band (not corrected for Galactic extinction) (PSFMAGg) (phot.mag;em.opt.B)
PSFMAGr 20.0142 mag [14.4/26.6] PSF (AB) magnitude in r band (not corrected for Galactic extinction) (PSFMAGr) (phot.mag;em.opt.R)
PSFMAGi 19.7058 mag [14/30] PSF (AB) magnitude in i band (not corrected for Galactic extinction) (PSFMAGi) (phot.mag;em.opt.I)
PSFMAGz 19.5737 mag [14.3/24.5] PSF (AB) magnitude in z band (not corrected for Galactic extinction) (PSFMAGz) (src.redshift;pos.heliocentric)
PSFMAGERRu 7.23312e-02 mag [0.007/2.7e+6] umag uncertainty (PSFMAGERRu) (stat.error;phot.mag)
PSFMAGERRg 2.81618e-02 mag [0.007/38] gmag uncertainty (PSFMAGERRg) (stat.error;phot.mag)
PSFMAGERRr 2.06580e-02 mag [0.005/26] rmag uncertainty (PSFMAGERRr) (stat.error;phot.mag)
PSFMAGERRi 3.15192e-02 mag [0.006/2.4e+6] imag uncertainty (PSFMAGERRi) (stat.error;phot.mag)
PSFMAGERRz 6.94612e-02 mag [0.008/114] zmag uncertainty (PSFMAGERRz) (stat.error;phot.mag)
EXTINCTIONu 0.156755 mag [0.009/3.8] Galactic extinction in the u-band from Schlafly & Finkbeiner (2011ApJ...737..103S) (EXTINCTIONu) (phys.absorption)
EXTINCTIONg 0.122143 mag [0.007/2.8] Galactic extinction in the g-band from Schlafly & Finkbeiner (2011ApJ...737..103S) (EXTINCTIONg) (phys.absorption)
EXTINCTIONr 0.084498 mag [0.005/2.1] Galactic extinction in the r-band from Schlafly & Finkbeiner (2011ApJ...737..103S) (EXTINCTIONr) (phys.absorption)
EXTINCTIONi 0.062791 mag [0.003/1.6] Galactic extinction in the i-band from Schlafly & Finkbeiner (2011ApJ...737..103S) (EXTINCTIONi) (phys.absorption)
EXTINCTIONz 0.046705 mag [0.002/1.1] Galactic extinction in the z-band from Schlafly & Finkbeiner (2011ApJ...737..103S) (EXTINCTIONz) (phys.absorption)
M_I-23.5145 mag [-31.4/2] Absolute i-band magnitude, Mi[z=2] using zPCA redshift, corrected for extinction (M_I) (Note 4)   (phys.magAbs)
SN_MEDIAN_ALL 5.7646   [-1.6/77] S/N median value for all good pixels in the five bands (SN_MEDIAN_ALL) (stat.snr)
GALEX_MATCHED1  GALEX matching flag (1=match) (GALEX_MATCHED) (meta.code)
FUV 1.6921 3.63uJy [-1.4/1318] FUV flux for GALEX in nMgy (FUV) (phot.flux;em.UV)
FUV_IVAR 90.8610 3.63uJy [-1/68408] Inverse variance of FFUV in nMgy (FUV_IVAR) (phot.flux;em.UV)
NUV 8.4192 3.63uJy [-1.3/1235] NUV flux for GALEX in nMgy (NUV) (phot.flux;em.UV)
NUV_IVAR 1.7218 3.63uJy Inverse variance of the NUV flux in nMgy (NUV_IVAR) (phot.flux;em.UV)
UKIDSS_MATCHED1  UKIDSS DR8 matching flag (UKIDSS_MATCHED) (meta.code)
YFLUX 1.59394e-30 W/m2/Hz [-5e-30/1.2e-29] Y-band flux density from UKIDSS (YFLUX) (phot.flux.density;em.IR)
YFLUX_ERR 2.75879e-32 W/m2/Hz [5.8e-33/6.7e-30] FY uncertainty (YFLUX_ERR) (stat.error)
JFLUX 1.26371e-30 W/m2/Hz J-band flux density from UKIDSS (JFLUX) (phot.flux.density;em.IR.J)
JFLUX_ERR 2.97212e-32 W/m2/Hz FJ uncertainty (JFLUX_ERR) (stat.error)
HFLUX 1.89375e-30 W/m2/Hz H-band flux density from UKIDSS (HFLUX) (phot.flux.density;em.IR.H)
HFLUX_ERR 5.50479e-32 W/m2/Hz FH uncertainty (HFLUX_ERR) (stat.error)
KFLUX 2.87136e-30 W/m2/Hz K-band flux density from UKIDSS (KFLUX) (phot.mag;em.IR.K)
KFLUX_ERR 5.03467e-32 W/m2/Hz FK uncertainty (KFLUX_ERR) (stat.error)
W1_FLUX 1.86380e+03 309.05nJy [-84770/197356] WISE flux in the W1 band (3.4um; Vega, nanomaggies) (W1_FLUX) (Note 5)   (phot.mag;em.IR.3-4um)
W1_FLUX_IVAR 5.75880e-03 309.05nJy-2 [4.5e-6/0.14] Inverse variance of FW1 (Vega, nanomaggies–2) (W1_FLUX_IVAR) (phot.mag;em.IR.3-4um)
W1_MAG14.3240 mag [9.2/31.2] WISE W1-band magnitude (Vega) (W1_MAG) (phot.mag;em.IR.3-4um)
W1_MAG_ERR 0.0077 mag [0.0001/52540] W1mag uncertainty (W1_MAG_ERR) (stat.error;phot.mag)
W1_CHI2 7.95874e+00   [-1/1.2e+6] Profile-weighted ξ2 for the W1 band (W1_CHI2) (stat.fit.chi2)
W1_FLUX_SNR 141.4377   [-5564/14926] Signal-to-noise ratio for the W1 band from the flux and inverse variance (W1_FLUX_SNR) (stat.snr)
W1_SRC_FRAC 0.945370   [-1/1] Fraction of source in profile-weighted fit (W1_SRC_FRAC) (stat.fit.omc)
W1_EXT_FLUX 5.04210e-01   [-12060/6841] Amount of flux added to the profile by nearby sources (W1_EXT_FLUX) (stat.fit.omc)
W1_EXT_FRAC 0.000271   [-205/2488] Fraction of profile flux from nearby sources (W1_EXT_FRAC) (stat.fit.omc)
W1_NPIX 220   [-1/3817] Number of pixels included in the profile fit (W1_NPIX) (meta.number)
W2_FLUX 5.50398e+03 167.66nJy [-127664/527681] WISE flux in the W2 band (4.6um; Vega, nanomaggies) (W2_FLUX) (phot.mag;em.IR.4-8um)
W2_FLUX_IVAR 0.000431 167.66nJy-2 [0/0.011] Inverse variance of FW2 (Vega, nanomaggies–2) (W2_FLUX_IVAR) (phot.mag;em.IR.4-8um)
W2_MAG13.1483 mag [8.1/31.4] WISE W2-band magnitude (Vega) (W2_MAG) (phot.mag;em.IR.4-8um)
W2_MAG_ERR 0.0095 mag [0.0002/245404] W2mag uncertainty (W2_MAG_ERR) (stat.error;phot.mag)
W2_CHI2 2.16458e+00   [-1/114995] Profile-weighted ξ2 for the W2 band (W2_CHI2) (stat.fit.chi2)
W2_FLUX_SNR 114.2553   [-2241/6734] Signal-to-noise ratio for the W2 band from flux and inverse variance (W2_FLUX_SNR) (stat.snr)
W2_SRC_FRAC 0.953342   [-1/1] Fraction of source in the profile-weighted fit (W2_SRC_FRAC) (stat.fit.omc)
W2_EXT_FLUX 1.84453e-01   [-9089/6580] Amount of flux added to the profile by nearby sources (W2_EXT_FLUX) (stat.fit.omc)
W2_EXT_FRAC 0.000034   [-9.7/12145] Fraction of profile flux from nearby sources (W2_EXT_FRAC) (stat.fit.omc)
W2_NPIX 206   [-1/3306] Number of pixels included in the profile fit (W2_NPIX) (meta.number)
FIRST_MATCHED1  Matching flag for FIRST (FIRST_MATCHED) (meta.code)
FIRST_FLUX 896.5400 mJy [0.75/14775] FIRST peak flux density at 20cm (FIRST_FLUX) (phot.flux.density;em.radio.750-1500MHz)
FIRST_SNR 3500.8513   [5/21190] FIRST flux density S/N (FIRST_SNR) (stat.snr)
SDSS2FIRST_SEP 0.3847 arcsec [/2] SDSS-FIRST separation (SDSS2FIRST_SEP) (pos;arith.diff)
Jmag  mag [13/19] 2MASS (Vega) J-band magnitude (phot.mag;em.IR.J)
JMAG_ERR  mag [0.018/3] Jmag uncertainty (JMAG_ERR) (stat.error;phot.mag)
JSNR    [2.9/215] 2MASS J-band S/N (JSNR) (stat.snr)
JRDFLAG-1   [-1/6] 2MASS J-band photometry flag (JRDFLAG) (meta.code)
Hmag  mag [12.2/18.2] 2MASS (Vega) H-band magnitude (phot.mag;em.IR.H)
HMAG_ERR  mag [0.015/0.6] Hmag uncertainty (HMAG_ERR) (stat.error;phot.mag)
HSNR    [1.9/213] 2MASS H-band S/N (HSNR) (stat.snr)
HRDFLAG-1  2MASS H-band photometry flag (HRDFLAG) (meta.code)
Kmag  mag [11.3/17.7] 2MASS (Vega) K-band magnitude (phot.mag;em.IR.K)
KMAG_ERR  mag [0.017/1] Kmag uncertainty (KMAG_ERR) (stat.error;phot.mag)
KSNR    [2.2/259] 2MASS K-band S/N (KSNR) (stat.snr)
KRDFLAG-1  2MASS K-band photometry flag (KRDFLAG) (meta.code)
SDSS2MASS_SEP  arcsec [0.002/2] SDSS-2MASS separation (SDSS2MASS_SEP) (pos;arith.diff)
2RXSJ012155.4+042242  2nd ROSAT identifier ( 2RXS_ID) (meta.id.cross)
RARdeg 20.48117 deg Right ascension of the ROSAT source (J2000) ( 2RXS_RA) (pos.eq.ra)
DERdeg 4.37843 deg Declination of the ROSAT source (J2000) ( 2RXS_DEC) (pos.eq.dec)
F0.5-2 8.32576e-13 mW/m2 [1e-13/5.6e-11] ROSAT source flux in the 0.5-2.0keV band in erg/s/cm2 ( 2RXSSRCFLUX) (phot.flux;em.X-ray.soft)
e_F0.5-2 2.48274e-13 mW/m2 [0/3.6e-12] F0.5-2 uncertainty ( 2RXSSRCFLUX_ERR) (stat.error)
SDSS2ROSAT_SEP27.0359 arcsec [0.12/97.4] SDSS-ROSAT separation (SDSS2ROSAT_SEP) (pos;arith.diff)
XMM_SRC_ID    XMM source number (XMM_SRC_ID) (meta.id.cross)
XMM_RA  deg XMM right ascension (J2000) (XMM_RA) (pos.eq.ra)
XMM_DEC  deg XMM declination (J2000) (XMM_DEC) (pos.eq.dec)
XMM_SOFT_FLUX  mW/m2 [0/6.4e-12] XMM soft (0.2-2.0keV) X-ray flux in erg/s/cm2 (XMM_SOFT_FLUX) (phot.flux;em.X-ray)
XMM_SOFT_FLUX_ERR  mW/m2 [5.2e-17/5e-14] F0.2-2 uncertainty (XMM_SOFT_FLUX_ERR) (stat.error)
XMM_HARD_FLUX  mW/m2 [0/8.6e-12] XMM hard (2.0-12.0keV) X-ray flux in erg/s/cm2 (XMM_HARD_FLUX) (phot.flux;em.X-ray)
XMM_HARD_FLUX_ERR  mW/m2 [3.5e-16/3.3e-13] F2-12 uncertainty (XMM_HARD_FLUX_ERR) (stat.error)
XMM_TOTAL_FLUX  mW/m2 [1.8e-15/1.5e-11] XMM total (0.2-12.0keV) X-ray flux in erg/s/cm2 (XMM_TOTAL_FLUX) (phot.flux;em.X-ray)
XMM_TOTAL_FLUX_ERR  mW/m2 [5.5e-16/4.7e-13] F0.2-12 uncertainty (XMM_TOTAL_FLUX_ERR) (stat.error)
SDSS2XMM_SEP  arcsec [0.0026/12] SDSS-XMM-Newton separation (SDSS2XMM_SEP) (pos;arith.diff)
GAIA_MATCHED1   [0/1] Gaia matching flag (GAIA_MATCHED) (meta.code)
GAIA_DESIGNATION2563396667354026496   Gaia DR2 identifier (GAIA_DESIGNATION) (meta.id.cross)
GAIA_RA 20.4869236 deg Gaia barycentric right ascension (J2015.5) (GAIA_RA) (pos.eq.ra)
GAIA_DEC 4.3735374 deg Gaia barycentric declination (J2015.5) (GAIA_DEC) (pos.eq.dec)
GAIA_PARALLAX -1.3201 mas [-25.2/14] Gaia absolute stellar parallax (J2015.5) (GAIA_PARALLAX) (pos.parallax)
GAIA_PARALLAX_ERR 2.1750 mas [0/1415] Plx uncertainty (GAIA_PARALLAX_ERR) (stat.error;pos.parallax)
GAIA_PM_RA 0.547 mas/yr [-42/38.3] Gaia proper motion in RA (J2015.5) (GAIA_PM_RA) (pos.pm;pos.eq.ra)
GAIA_PM_RA_ERR 1.186 mas/yr [0/763] pmRA uncertainty (GAIA_PM_RA_ERR) (stat.error;pos.pm;pos.eq.ra)
GAIA_PM_DEC 0.777 mas/yr [-40.1/43.3] Gaia proper motion in DEC (J2015.5) (GAIA_PM_DEC) (pos.pm;pos.eq.dec)
GAIA_PM_DEC_ERR 2.549 mas/yr [0/725] pmDE uncertainty (GAIA_PM_DEC_ERR) (stat.error;pos.pm;pos.eq.dec)
GAIA_G_MAG19.6271 mag [14.6/22] Gaia mean magnitude in the G band (Vega) (GAIA_G_MAG) (phot.mag;em.opt)
GAIA_G_FLUX_SNR 49.3814   [5/1805] Mean flux over the standard deviation in the (Vega) G band (GAIA_G_FLUX_SNR) (stat.snr)
GAIA_BP_MAG19.6789 mag [0/23.6] Gaia mean magnitude in the (Vega) BP band (GAIA_BP_MAG) (phot.mag;em.opt.B)
GAIA_BP_FLUX_SNR 12.1600   [0/9423] Mean flux over the standard deviation in the (Vega) BP band (GAIA_BP_FLUX_SNR) (stat.snr)
GAIA_RP_MAG19.0288 mag [0/23.2] Gaia mean magnitude in the (Vega) RP band (GAIA_RP_MAG) (phot.mag;em.opt.R)
GAIA_RP_FLUX_SNR 11.7303   [0/39131] Mean flux over the standard deviation in the (Vega) RP band (GAIA_RP_FLUX_SNR) (stat.snr)
SDSS2GAIA_SEP 0.1197 arcsec [0.0001/0.5] SDSS-Gaia separation (SDSS2GAIA_SEP) (pos;arith.diff)

SpSp  Display the SDSS data for this quasar (meta.ref.url)
SimbadSDSS J012156.85+042224.8  ask the Simbad data-base about this object (meta.ref.url)
  
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