Choose a database in the left panel then select the table you want!

Table: sdss_dr16.dr16q
(The bold columns are indexed columns)
Column NameDescriptionDatatype
ai_civAbsorption index for C IV Lambda1549 regionDOUBLE
ai_siivAbsorption index for Si IV Lambda1396 regionDOUBLE
ancillary_target1BOSS target selection flag for ancillary programsBIGINT
ancillary_target2BOSS target selection flag for ancillary programsBIGINT
autoclass_dr14qObject classification based only on the DR14Q algorithmCHAR
autoclass_pqnObject classification post-QuasarNETCHAR
bal_probBAL probabilityDOUBLE
bi_civBALnicity index for C IV Lambda1549 regionDOUBLE
bi_siivBALnicity index for Si IV Lambda1396 regionDOUBLE
boss_target1BOSS target selection for main surveyBIGINT
chunkName of tiling chunk (from platelist product)CHAR
class_personObject classification from visual inspectionINTEGER
conf_dla_1Confidence of detection for damped LyAlpha featuresDOUBLE
conf_dla_2Confidence of detection for damped LyAlpha featuresDOUBLE
conf_dla_3Confidence of detection for damped LyAlpha featuresDOUBLE
conf_dla_4Confidence of detection for damped LyAlpha featuresDOUBLE
conf_dla_5Confidence of detection for damped LyAlpha featuresDOUBLE
decDeclination in decimal degrees (J2000)DOUBLE
deltachi2_ciiiDelta Chi^2 for C III] Lambda1908 line redshift vs. cubic continuum fitDOUBLE
deltachi2_civDelta Chi^2 for C IV Lambda1549 line redshift vs. cubic continuum fitDOUBLE
deltachi2_halphaDelta Chi^2 for HAlpha line redshift vs. cubic continuum fitDOUBLE
deltachi2_hbetaDelta Chi^2 for HBetha line redshift vs. cubic continuum fitDOUBLE
deltachi2_lyaDelta Chi^2 for LyAlpha line redshift vs. cubic continuum fitDOUBLE
deltachi2_mgiiDelta Chi^2 for Mg II Lambda2799 line redshift vs. cubic continuum fitDOUBLE
deltachi2_pcaDelta Chi^2 for PCA redshift vs. cubic continuum fitDOUBLE
disk_onlyTRUE if the object is not listed in specobjallCHAR
eboss_target0Target selection flag for the eBOSS pilot survey (SEQUELS)BIGINT
eboss_target1eBOSS target selection flagBIGINT
eboss_target2eBOSS target selection flagBIGINT
elatEcliptic LatitudeDOUBLE
elonEcliptic LongitudeDOUBLE
err_ai_civUncertainty of absorption index for C IV Lambda1549 regionDOUBLE
err_ai_siivUncertainty of absorption index for Si IV Lambda1396 regionDOUBLE
err_bi_civUncertainty of BI for C IV Lambda1549 regionDOUBLE
err_bi_siivUncertainty of BI for Si IV Lambda1396 regionDOUBLE
extinction_gGalactic extinction in u, g, r, i, z bandsDOUBLE
extinction_iGalactic extinction in u, g, r, i, z bandsDOUBLE
extinction_rGalactic extinction in u, g, r, i, z bandsDOUBLE
extinction_uGalactic extinction in u, g, r, i, z bandsDOUBLE
extinction_zGalactic extinction in u, g, r, i, z bandsDOUBLE
fiberidFiber ID numberSMALLINT
first_fluxFIRST peak flux density at 20 cm in mJyDOUBLE
first_matchedMatching flag for FIRSTINTEGER
first_snrFIRST flux density S/NDOUBLE
fuvFUV flux from GALEXDOUBLE
fuv_ivarInverse variance of FUV flux from GALEXDOUBLE
gaia_bp_flux_snrMean flux over standard deviation in BP-band (Vega)DOUBLE
gaia_bp_magMean magnitude in BP-band (Vega)DOUBLE
gaia_decGaia barycentric declination in decimal degrees (J2015.5)DOUBLE
gaia_designationGaia designation, includes data release and source ID in that releaseCHAR
gaia_g_flux_snrMean flux over standard deviation in G-band (Vega)DOUBLE
gaia_g_magMean magnitude in G-band (Vega)DOUBLE
gaia_matchedGaia matching flagINTEGER
gaia_parallaxAbsolute stellar parallax (J2015.5)DOUBLE
gaia_parallax_errInverse variance of the stellar parallax (J2015.5)DOUBLE
gaia_pm_decProper motion in declination (mas yr-1, J2015.5)DOUBLE
gaia_pm_dec_errInverse variance of the proper motion in declination (yr2 mas-2, J2015.5)DOUBLE
gaia_pm_raProper motion in right ascension (mas yr-1, J2015.5)DOUBLE
gaia_pm_ra_errInverse variance of the proper motion in right ascension (yr2 mas-2, J2015.5)DOUBLE
gaia_raGaia barycentric right ascension in decimal degrees (J2015.5)DOUBLE
gaia_rp_flux_snrMean flux over standard deviation in RP-band (Vega)DOUBLE
gaia_rp_magMean magnitude in RP-band (Vega)DOUBLE
galex_matchedMatching flag for GALEXINTEGER
glatGalactic LatitudeDOUBLE
glonGalactic LongitudeDOUBLE
hfluxH-band flux density from UKIDSS in W m-2 Hz-1DOUBLE
hflux_errError in H-band flux density from UKIDSS in W m-2 Hz-1DOUBLE
hmag2MASS H-band magnitude (Vega)DOUBLE
hmag_err2MASS Error in H-band magnitudeDOUBLE
hrdflag2MASS H-band photometry flagSMALLINT
hsnr2MASS H-band S/NDOUBLE
htm9HTM index (order 9 => ~10 arcmin size)INTEGER
is_qso_10kBinary flag for random set quasar identificationINTEGER
is_qso_dr12qFlag indicating if an object was a quasar in DR12QINTEGER
is_qso_dr7qFlag indicating if an object was a quasar in DR7QINTEGER
is_qso_finalFlag indicating quasars to be included in final catalogINTEGER
is_qso_qnBinary flag for QuasarNET quasar identificationINTEGER
jfluxJ-band flux density from UKIDSS in W m-2 Hz-1DOUBLE
jflux_errError in J-band flux density from UKIDSS in W m-2 Hz-1DOUBLE
jmag2MASS J-band magnitude (Vega)DOUBLE
jmag_err2MASS Error in J-band magnitudeDOUBLE
jrdflag2MASS J-band photometry flagSMALLINT
jsnr2MASS J-band S/NDOUBLE
kfluxK-band flux density from UKIDSS in W m-2 Hz-1DOUBLE
kflux_errError in K-band flux density from UKIDSS in W m-2 Hz-1DOUBLE
kmag2MASS Ks-band magnitude (Vega)DOUBLE
kmag_err2MASS Error in Ks-band magnitudeDOUBLE
krdflag2MASS Ks-band photometry flagSMALLINT
ksnr2MASS Ks-band S/NDOUBLE
lambda_effWavelength to optimize hold location for, in AngstromsDOUBLE
miAbsolute i-band magnitude, H0 = 67.6 km s-1 Mpc-1, OMEGAM = 0.31, OMEGAL = 0.69, OMEGAR = 9.11x10-5. K-corrections taken from Table 4 of Richards et al. (2006). Z_PCA used for redshiftsDOUBLE
mjdModified Julian day of the spectroscopic observationINTEGER
nest4096HEALPIX index (Nsides 4096, Nest scheme => ~52 arcsec sizeINTEGER
nhi_dla_1Absorber column density for damped LyAlpha featuresDOUBLE
nhi_dla_2Absorber column density for damped LyAlpha featuresDOUBLE
nhi_dla_3Absorber column density for damped LyAlpha featuresDOUBLE
nhi_dla_4Absorber column density for damped LyAlpha featuresDOUBLE
nhi_dla_5Absorber column density for damped LyAlpha featuresDOUBLE
nspecTotal number of additional observationsSMALLINT
nspec_bossNumber of additional observations from BOSS/eBOSSSMALLINT
nspec_sdssNumber of additional observations from SDSS-I/IISMALLINT
nuvNUV flux from GALEXDOUBLE
nuv_ivarInverse variance of NUV flux from GALEXDOUBLE
objidSDSS object identification numberCHAR
pipe_corr_10kBinary flag indicating if the automated pipeline classification and redshift were correct in the random setINTEGER
plateSpectroscopic plate numberSMALLINT
platesn2Overall (S/N)2 measure for plate, minimum of all 4 camerasDOUBLE
psfflux_gFlux in u, g, r, i, z bandsDOUBLE
psfflux_iFlux in u, g, r, i, z bandsDOUBLE
psfflux_ivar_gInverse variance of u, g, r, i, z fluxesDOUBLE
psfflux_ivar_iInverse variance of u, g, r, i, z fluxesDOUBLE
psfflux_ivar_rInverse variance of u, g, r, i, z fluxesDOUBLE
psfflux_ivar_uInverse variance of u, g, r, i, z fluxesDOUBLE
psfflux_ivar_zInverse variance of u, g, r, i, z fluxesDOUBLE
psfflux_rFlux in u, g, r, i, z bandsDOUBLE
psfflux_uFlux in u, g, r, i, z bandsDOUBLE
psfflux_zFlux in u, g, r, i, z bandsDOUBLE
psfmag_gPSF magnitudes in u, g, r, i, z bandsDOUBLE
psfmag_iPSF magnitudes in u, g, r, i, z bandsDOUBLE
psfmag_rPSF magnitudes in u, g, r, i, z bandsDOUBLE
psfmag_uPSF magnitudes in u, g, r, i, z bandsDOUBLE
psfmag_zPSF magnitudes in u, g, r, i, z bandsDOUBLE
psfmagerr_gError of PSF magnitudes in u, g, r, i, z bandsDOUBLE
psfmagerr_iError of PSF magnitudes in u, g, r, i, z bandsDOUBLE
psfmagerr_rError of PSF magnitudes in u, g, r, i, z bandsDOUBLE
psfmagerr_uError of PSF magnitudes in u, g, r, i, z bandsDOUBLE
psfmagerr_zError of PSF magnitudes in u, g, r, i, z bandsDOUBLE
raRight ascension in decimal degrees (J2000)DOUBLE
random_idRandom ID in the range 0.0 => 100.0REAL
random_selectBinary flag indicating objects selected for random visual inspectionINTEGER
ring256HEALPIX index (Nsides 256, Ring scheme => ~14 arcmin size)INTEGER
rosat_decDeclination of the ROSAT source in decimal degrees (J2000)DOUBLE
rosat_idROSAT IDCHAR
rosat_raRight ascension of the ROSAT source in decimal degrees (J2000)DOUBLE
rosat_src_fluxROSAT source flux in 0.5-2.0 keV band in erg s-1 cm-2 (G = 2.4, dered)DOUBLE
rosat_src_flux_errROSAT source flux error in 0.5-2.0 keV band in erg s-1 cm-2 (G = 2.4, dered)DOUBLE
run2dSpectroscopic reduction versionCHAR
sdss2first_sepSDSS-FIRST separation in arcsecDOUBLE
sdss2gaia_sepSDSS-Gaia separation in arcsecDOUBLE
sdss2mass_sepSDSS-2MASS separation in arcsecDOUBLE
sdss2rosat_sepSDSS-ROSAT separation in arcsecDOUBLE
sdss2xmm_sepSDSS-XMM-Newton separation in arcsecDOUBLE
sdss_joinidUnique ID based on PLATE, MJD, FIBERID for joining across data releasesBIGINT
sdss_nameSDSS-DR16 designation (hhmmss.ss+/-ddmmss.s, J2000)CHAR
sn_median_allMedian S/N value of all good spectroscopic pixelsDOUBLE
specobjidUnique database ID based on PLATE, MJD, FIBERID, RUN2DBIGINT
thing_idSDSS identifierBIGINT
tileTile numberSMALLINT
ukidss_matchedMatching flag for UKIDSSINTEGER
w1_chi2Profile-weighed Chi^2DOUBLE
w1_ext_fluxProfile-weighted flux from other sourcesDOUBLE
w1_ext_fracProfile-weighted fraction of flux from other sources (blendedness measure)DOUBLE
w1_fluxWISE flux in W1-band (Vega, nanomaggies)DOUBLE
w1_flux_ivarInverse variance in W1-band (Vega, nanomaggies-2)DOUBLE
w1_flux_snrS/N from flux and inverse varianceDOUBLE
w1_magW1-band magnitude (Vega)DOUBLE
w1_mag_errW1-band uncertainty in magnitude (Vega)DOUBLE
w1_npixNumber of pixels in fitINTEGER
w1_src_fracProfile-weighted number of exposures in coaddDOUBLE
w2_chi2Profile-weighed Chi^2DOUBLE
w2_ext_fluxProfile-weighted flux from other sourcesDOUBLE
w2_ext_fracProfile-weighted fraction of flux from other sources (blendedness measure)DOUBLE
w2_fluxWISE flux in W2-band (Vega, nanomaggies)DOUBLE
w2_flux_ivarInverse variance in W2-band (Vega, nanomaggies-2)DOUBLE
w2_flux_snrS/N from flux and inverse varianceDOUBLE
w2_magW2-band magnitude (Vega)DOUBLE
w2_mag_errW2-band uncertainty in magnitude (Vega)DOUBLE
w2_npixNumber of pixels in fitINTEGER
w2_src_fracProfile-weighted number of exposures in coaddDOUBLE
xfocalHole x-axis position in focal plane, in mmDOUBLE
xmm_decDeclination for XMM source in decimal degrees (J2000)DOUBLE
xmm_hard_fluxHard (2.0-12.0 keV) X-ray flux from XMM-Newton in erg s-1 cm-2DOUBLE
xmm_hard_flux_errError on hard X-ray flux from XMM-Newton in erg s-1 cm-2DOUBLE
xmm_raRight ascension for XMM source in decimal degrees (J2000)DOUBLE
xmm_soft_fluxSoft (0.2-2.0 keV) X-ray flux from XMM-Newton in erg s-1 cm-2DOUBLE
xmm_soft_flux_errError on soft X-ray flux from XMM-Newton in erg s-1 cm-2DOUBLE
xmm_src_idXMM source IDBIGINT
xmm_total_fluxTotal (0.2-12.0 keV) X-ray flux from XMM-Newton in erg s-1 cm-2DOUBLE
xmm_total_flux_errError on total X-ray flux from XMM-Newton in erg s-1 cm-2DOUBLE
xmm_total_lumTotal (0.2-12.0 keV) X-ray luminosity from XMM-Newton in erg s-1DOUBLE
yfluxY-band flux density from UKIDSS in W m-2 Hz-1DOUBLE
yflux_errError in Y-band flux density from UKIDSS in W m-2 Hz-1DOUBLE
yfocalHole y-axis position in focal plane, in mmDOUBLE
zBest available redshift taken from Z_VI, Z_PIPE, Z_DR12Q, Z_DR7Q_SCH, Z_DR6Q_HW, and Z_10KDOUBLE
z_10kRedshift from visual inspection in random setDOUBLE
z_ciiiPCA line redshift for C III] Lambda1908 from redvsblueDOUBLE
z_civPCA line redshift for C IV Lambda1549 from redvsblueDOUBLE
z_confConfidence rating for visual inspection redshiftINTEGER
z_conf_10kConfidence rating for visual inspection redshift in random setINTEGER
z_dla_1Redshift for damped LyAlpha featuresDOUBLE
z_dla_2Redshift for damped LyAlpha featuresDOUBLE
z_dla_3Redshift for damped LyAlpha featuresDOUBLE
z_dla_4Redshift for damped LyAlpha featuresDOUBLE
z_dla_5Redshift for damped LyAlpha featuresDOUBLE
z_dr12qRedshift taken from DR12Q visual inspectionDOUBLE
z_dr6q_hwRedshift taken from DR6-based Hewett and Wild (2010) catalogDOUBLE
z_dr7q_hwRedshift using Hewett and Wild (2010) updates for DR7Q sources from the Shen et al. (2011) catalogDOUBLE
z_dr7q_schRedshift taken from DR7Q Schneider et al (2010) catalogDOUBLE
z_halphaPCA line redshift for HAlpha from redvsblueDOUBLE
z_hbetaPCA line redshift for HBetha from redvsblueDOUBLE
z_lyaPCA line redshift for LyAlpha from redvsblueDOUBLE
z_lyawgPCA systemic redshift from redvsblue with a masked LyAlpha emission line and forestDOUBLE
z_mgiiPCA line redshift for Mg II Lambda2799 from redvsblueDOUBLE
z_pcaPCA-derived systemic redshift from redvsblueDOUBLE
z_pipeSDSS automated pipeline redshiftDOUBLE
z_qnSystemic redshift from QuasarNETDOUBLE
z_viVisual inspection redshiftDOUBLE
zoffsetBackstopping offset distance, in micromDOUBLE
zsourceOrigin of the reported redshift in ZCHAR
zwarn_ciiiWarning flag for C III] Lambda1908 redshiftBIGINT
zwarn_civWarning flag for C IV Lambda1549 redshiftBIGINT
zwarn_halphaWarning flag for HAlpha redshiftBIGINT
zwarn_hbetaWarning flag for HBetha redshiftBIGINT
zwarn_lyaWarning flag for LyAlpha redshiftBIGINT
zwarn_mgiiWarning flag for Mg II Lambda2799 redshiftBIGINT
zwarn_pcaWarning flag for redvsblue redshiftBIGINT
zwarningQuality flag on the pipeline redshift estimateINTEGER