Standard Column Descriptions¶
This file is an autogenerated version of column_descriptions.csv, which contains the descriptions of table column names regardless of what file(s) they appear in.
Name 
Type 
Units 
Description 

ABSMAG_R 
float64 
Absolute magnitude in the rband after kcorrection 

AIRMASS 
float32 
Average airmass during this exposure 

AIRMASS_GFA 
float64 
Average airmass during this exposure as measured by GFA 

APFLUX_G 
float32 
nanomaggy 
Total flux in nanomaggies extracted in a 0.75 arcsec radius in the g band at this location 
APFLUX_IVAR_G 
float32 
nanomaggy^2 
Inverse variance of APFLUX_G 
APFLUX_IVAR_R 
float32 
nanomaggy^2 
Inverse variance of APFLUX_R 
APFLUX_IVAR_Z 
float32 
nanomaggy^2 
Inverse variance of APFLUX_Z 
APFLUX_R 
float32 
nanomaggy 
Total flux in nanomaggies extracted in a 0.75 arcsec radius in the r band at this location 
APFLUX_Z 
float32 
nanomaggy 
Total flux in nanomaggies extracted in a 0.75 arcsec radius in the z band at this location 
A_MGII 
float32 
Fitted parameter A (amplitude) by MgII fitter 

BGS_TARGET 
int64 
BGS (Bright Galaxy Survey) target selection bitmask 

BITWEIGHTS 
int64[2] 
A size of two 64 bit masks that encodes which of the alternative assignment histories that the target was assigned in 

BLOBDIST 
float32 
pix 
Maximum distance from a detected Legacy Surveys source 
BRICKID 
int32 
Brick ID from tractor input 

BRICKNAME 
char[8] 
Brick name from tractor input 

BRICK_OBJID 
int32 
Imaging Surveys OBJID on that brick 

B_MGII 
float32 
Fitted parameter B (constant) by MgII fitter 

CAMERA 
char[2] 
Camera identifier. Passband and SPECGRPH ([brz][09]). 

CHECKER 
char[5] 
Initials of researcher who vetted the target 

CHI2 
float64 
Best fit chi squared 

CMX_TARGET 
int64 
Target selection bitmask for commissioning 

COADD_EXPTIME 
float32 
s 
Summed exposure time for coadd 
COADD_FIBERSTATUS 
int32 
bitwiseAND of input FIBERSTATUS 

COADD_NUMEXP 
int16 
Number of exposures in coadd 

COADD_NUMNIGHT 
int16 
Number of nights in coadd 

COADD_NUMTILE 
int16 
Number of tiles in coadd 

COEFF 
float64[10] 
Redrock template coefficients 

COMP_TILE 
float64 
Assignment completeness for all targets of this type with the same value for TILES 

C_CIII 
float32 
Confidence for CIII line 

C_CIV 
float32 
Confidence for CIV line 

C_Halpha 
float32 
Confidence for Halpha line 

C_Hbeta 
float32 
Confidence for Hbeta line 

C_LYA 
float32 
Confidence for LyA line, i.e. ~probability to be a QSO 

C_MgII 
float32 
Confidence for MgII line 

DCHISQ 
float32[5] 
Difference in chisquared between Tractor model fits 

DEC 
float64 
deg 
Barycentric declination in ICRS 
DEC_IVAR 
float32 
deg^2 
Inverse variance of DEC, excluding astrometric calibration errors 
DELTACHI2 
float64 
chi2 difference between first and secondbest redrock template fits 

DELTA_CHI2 
float32 
Difference of chi2 between redrock fit and MgII fitter over the lambda interval considered during the fit 

DELTA_X 
float64 
mm 
CS5 X requested minus actual position 
DELTA_Y 
float64 
mm 
CS5 Y requested minus actual position 
DESI_TARGET 
int64 
DESI (dark time program) target selection bitmask 

DESINAME 
char[22] 
Human readable identifier of a sky location precise to ~0.36 arcseconds. Note multiple objects can map to a single DESINAME if very close on the sky. 

DEVICE_LOC 
int32 
Device location on focal plane [0523] 

DEVICE_TYPE 
char[3] 
Device type 

EBV 
float32 
mag 
Galactic extinction E(BV) reddening from SFD98 
EFFTIME_ETC 
float64 
s 
Effective exposure time for nominal conditions inferred from ETC data 
EFFTIME_SPEC 
float64 
s 
Effective exposure time for nominal conditions derived from the TSNR2 fits to the spectroscopy 
EQ_ALL_0P0 
float64 
ecorrection at redshift=0.0 

EQ_ALL_0P1 
float64 
ecorrection at redshift=0.1 

EXPID 
int32 
DESI Exposure ID number 

EXPTIME 
float64 
s 
Length of time shutter was open 
FAFLAVOR 
char[*] 
Fiberassign flavor name 

FAPRGRM 
char[*] 
Fiberassign program name 

FA_TARGET 
int64 
Targeting bit internally used by fiberassign (linked with FA_TYPE) 

FA_TYPE 
binary 
Fiberassign internal target type (science, standard, sky, safe, suppsky) 

FIBER 
int32 
Fiber ID on the CCDs [04999] 

FIBERASSIGN_X 
float32 
mm 
Fiberassign expected CS5 X location on focal plane 
FIBERASSIGN_Y 
float32 
mm 
Fiberassign expected CS5 Y location on focal plane 
FIBERFLUX_G 
float32 
nanomaggy 
Predicted gband flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing 
FIBERFLUX_R 
float32 
nanomaggy 
Predicted rband flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing 
FIBERFLUX_Z 
float32 
nanomaggy 
Predicted zband flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing 
FIBERFLUX_IVAR_G 
float32 
nanomaggy^2 
Inverse variance of 
FIBERFLUX_IVAR_R 
float32 
nanomaggy^2 
Inverse variance of 
FIBERFLUX_IVAR_Z 
float32 
nanomaggy^2 
Inverse variance of 
FIBERSTATUS 
int32 
Fiber status mask. 0=good 

FIBERTOTFLUX_G 
float32 
nanomaggy 
Predicted gband flux within a fiber of diameter 1.5 arcsec from all sources at this location in 1 arcsec Gaussian seeing 
FIBERTOTFLUX_R 
float32 
nanomaggy 
Predicted rband flux within a fiber of diameter 1.5 arcsec from all sources at this location in 1 arcsec Gaussian seeing 
FIBERTOTFLUX_W1 
float32 
nanomaggy 
Predicted WISE W1band flux within a fiber of diameter 1.5 arcsec from all sources at this location in 1 arcsec Gaussian seeing 
FIBERTOTFLUX_W2 
float32 
nanomaggy 
Predicted WISE W2band flux within a fiber of diameter 1.5 arcsec from all sources at this location in 1 arcsec Gaussian seeing 
FIBERTOTFLUX_Z 
float32 
nanomaggy 
Predicted zband flux within a fiber of diameter 1.5 arcsec from all sources at this location in 1 arcsec Gaussian seeing 
FIBER_DEC 
float64 
deg 
DEC of actual fiber position 
FIBER_RA 
float64 
deg 
RA of actual fiber position 
FIBER_X 
float64 
mm 
CS5 X location requested by PlateMaker 
FIBER_Y 
float64 
mm 
CS5 Y location requested by PlateMaker 
FLUX_G 
float32 
nanomaggy 
Flux in the Legacy Survey gband (AB) 
FLUX_G_DERED 
float32 
nanomaggy 
Flux in the gband after correcting for Galactic extinction (AB system) 
FLUX_IVAR_G 
float32 
nanomaggy^2 
Inverse variance of FLUX_G (AB) 
FLUX_IVAR_R 
float32 
nanomaggy^2 
Inverse variance of FLUX_R (AB) 
FLUX_IVAR_W1 
float32 
nanomaggy^2 
Inverse variance of FLUX_W1 (AB) 
FLUX_IVAR_W2 
float32 
nanomaggy^2 
Inverse variance of FLUX_W2 (AB) 
FLUX_IVAR_Z 
float32 
nanomaggy^2 
Inverse variance of FLUX_Z (AB) 
FLUX_R 
float32 
nanomaggy 
Flux in the Legacy Survey rband (AB) 
FLUX_R_DERED 
float32 
nanomaggy 
Flux in the rband after correcting for Galactic extinction (AB system) 
FLUX_W1 
float32 
nanomaggy 
WISE flux in W1 (AB) 
FLUX_W1_DERED 
float32 
nanomaggy 
Flux in the WISE W1band after correcting for Galactic extinction (AB system) 
FLUX_W2 
float32 
nanomaggy 
WISE flux in W2 (AB) 
FLUX_W2_DERED 
float32 
nanomaggy 
Flux in the WISE W2band after correcting for Galactic extinction (AB system) 
FLUX_Z 
float32 
nanomaggy 
Flux in the Legacy Survey zband (AB) 
FLUX_Z_DERED 
float32 
nanomaggy 
Flux in the zband after correcting for Galactic extinction (AB system) 
FRACZ_TILELOCID 
float64 
The fraction of targets of this type at this TILELOCID that received an observation (after forcing each target to a unique TILELOCID) 

GAIA_ASTROMETRIC_EXCESS_NOISE 
float32 
Gaia astrometric excess noise 

GAIA_ASTROMETRIC_PARAMS_SOLVED 
int64 
which astrometric parameters were estimated for a Gaia source 

GAIA_ASTROMETRIC_SIGMA5D_MAX 
float32 
mas 
Gaia longest semimajor axis of the 5d error ellipsoid 
GAIA_DEC 
float64 
deg 
Gaia ICRS declination 
GAIA_DUPLICATED_SOURCE 
bool 
Gaia duplicated source flag 

GAIA_PHOT_BP_MEAN_FLUX_OVER_ERROR 
float32 
Gaia BP band signaltonoise 

GAIA_PHOT_BP_MEAN_MAG 
float32 
mag 
Gaia BP band magnitude 
GAIA_PHOT_BP_N_OBS 
int32 
Gaia BP band number of observations 

GAIA_PHOT_BP_RP_EXCESS_FACTOR 
float32 
Gaia BP/RP excess factor 

GAIA_PHOT_G_MEAN_FLUX_OVER_ERROR 
float32 
Gaia G band signaltonoise 

GAIA_PHOT_G_MEAN_MAG 
float32 
mag 
Gaia G band magnitude 
GAIA_PHOT_G_N_OBS 
int32 
Gaia G band number of observations 

GAIA_PHOT_RP_MEAN_FLUX_OVER_ERROR 
float32 
Gaia RP band signaltonoise 

GAIA_PHOT_RP_MEAN_MAG 
float32 
mag 
Gaia RP band magnitude 
GAIA_PHOT_RP_N_OBS 
int32 
Gaia RP band number of observations 

GAIA_RA 
float64 
deg 
Gaia ICRS right ascension 
GALDEPTH_G 
float32 
nanomaggy^2 
Galaxy modelbased depth in LS gband 
GALDEPTH_R 
float32 
nanomaggy^2 
Galaxy modelbased depth in LS rband 
GALDEPTH_Z 
float32 
nanomaggy^2 
Galaxy modelbased depth in LS zband 
GOODHARDLOC 
bool 
True/False whether the fiber had good hardware 

GOODPRI 
bool 
True/False whether the priority of what was assigned to the location was <= the base priority of the given target class 

GOODTSNR 
bool 
True/False whether the TSNR_<class> value used was above the minimum threshold for the given target class 

HALPHA_CHI2 
float32 
Reduced chi2 of the fit for the HALPHA line 

HALPHA_CONT 
float32 
10**17 erg/(s cm2 Angstrom) 
Continuum used for the fitting (fixed value) for the HALPHA line 
HALPHA_CONT_IVAR 
float32 
10**+34 (s2 cm4 Angstrom2) / erg2 
Inverse variance of the continuum for the HALPHA line 
HALPHA_EW 
float32 
Angstrom 
Fitted restframe equivalent width for the HALPHA line 
HALPHA_EW_IVAR 
float32 
Angstrom^2 
Inverse variance of the fitted restframe equivalent width for the HALPHA line 
HALPHA_FLUX 
float32 
10**17 erg/(s cm2) 
Fitted flux for the HALPHA line 
HALPHA_FLUX_IVAR 
float32 
10**+34 (s2 cm4) / erg2 
Inverse variance of the fitted flux for the HALPHA line 
HALPHA_NDOF 
int32 
Number of degrees of freedom of the fit for the HALPHA line 

HALPHA_SHARE 
float32 
NaN (SHARE not relevant for HALPHA line) 

HALPHA_SHARE_IVAR 
float32 
NaN (SHARE not relevant for HALPHA line) 

HALPHA_SIGMA 
float32 
Angstrom 
Fitted line width (in the observed frame) for the HALPHA line 
HALPHA_SIGMA_IVAR 
float32 
Angstrom^2 
Inverse variance of the fitted line width (in the observed frame) for the HALPHA line 
HBETA_CHI2 
float32 
Reduced chi2 of the fit for the HBETA line 

HBETA_CONT 
float32 
10**17 erg/(s cm2 Angstrom) 
Continuum used for the fitting (fixed value) for the HBETA line 
HBETA_CONT_IVAR 
float32 
10**+34 (s2 cm4 Angstrom2) / erg2 
Inverse variance of the continuum for the HBETA line 
HBETA_EW 
float32 
Angstrom 
Fitted restframe equivalent width for the HBETA line 
HBETA_EW_IVAR 
float32 
Angstrom^2 
Inverse variance of the fitted restframe equivalent width for the HBETA line 
HBETA_FLUX 
float32 
10**17 erg/(s cm2) 
Fitted flux for the HBETA line 
HBETA_FLUX_IVAR 
float32 
10**+34 (s2 cm4) / erg2 
Inverse variance of the fitted flux for the HBETA line 
HBETA_NDOF 
int32 
Number of degrees of freedom of the fit for the HBETA line 

HBETA_SHARE 
float32 
NaN (SHARE not relevant for HBETA line) 

HBETA_SHARE_IVAR 
float32 
NaN (SHARE not relevant for HBETA line) 

HBETA_SIGMA 
float32 
Angstrom 
Fitted line width (in the observed frame) for the HBETA line 
HBETA_SIGMA_IVAR 
float32 
Angstrom^2 
Inverse variance of the fitted line width (in the observed frame) for the HBETA line 
HDELTA_CHI2 
float32 
Reduced chi2 of the fit for the HDELTA line 

HDELTA_CONT 
float32 
10**17 erg/(s cm2 Angstrom) 
Continuum used for the fitting (fixed value) for the HDELTA line 
HDELTA_CONT_IVAR 
float32 
10**+34 (s2 cm4 Angstrom2) / erg2 
Inverse variance of the continuum for the HDELTA line 
HDELTA_EW 
float32 
Angstrom 
Fitted restframe equivalent width for the HDELTA line 
HDELTA_EW_IVAR 
float32 
Angstrom^2 
Inverse variance of the fitted restframe equivalent width for the HDELTA line 
HDELTA_FLUX 
float32 
10**17 erg/(s cm2) 
Fitted flux for the HDELTA line 
HDELTA_FLUX_IVAR 
float32 
10**+34 (s2 cm4) / erg2 
Inverse variance of the fitted flux for the HDELTA line 
HDELTA_NDOF 
int32 
Number of degrees of freedom of the fit for the HDELTA line 

HDELTA_SHARE 
float32 
NaN (SHARE not relevant for HDELTA line) 

HDELTA_SHARE_IVAR 
float32 
NaN (SHARE not relevant for HDELTA line) 

HDELTA_SIGMA 
float32 
Angstrom 
Fitted line width (in the observed frame) for the HDELTA line 
HDELTA_SIGMA_IVAR 
float32 
Angstrom^2 
Inverse variance of the fitted line width (in the observed frame) for the HDELTA line 
HEALPIX 
int32 
HEALPixel containing this location at NSIDE=64 in the NESTED scheme 

HGAMMA_CHI2 
float32 
Reduced chi2 of the fit for the HGAMMA line 

HGAMMA_CONT 
float32 
10**17 erg/(s cm2 Angstrom) 
Continuum used for the fitting (fixed value) for the HGAMMA line 
HGAMMA_CONT_IVAR 
float32 
10**+34 (s2 cm4 Angstrom2) / erg2 
Inverse variance of the continuum for the HGAMMA line 
HGAMMA_EW 
float32 
Angstrom 
Fitted restframe equivalent width for the HGAMMA line 
HGAMMA_EW_IVAR 
float32 
Angstrom^2 
Inverse variance of the fitted restframe equivalent width for the HGAMMA line 
HGAMMA_FLUX 
float32 
10**17 erg/(s cm2) 
Fitted flux for the HGAMMA line 
HGAMMA_FLUX_IVAR 
float32 
10**+34 (s2 cm4) / erg2 
Inverse variance of the fitted flux for the HGAMMA line 
HGAMMA_NDOF 
int32 
Number of degrees of freedom of the fit for the HGAMMA line 

HGAMMA_SHARE 
float32 
NaN (SHARE not relevant for HGAMMA line) 

HGAMMA_SHARE_IVAR 
float32 
NaN (SHARE not relevant for HGAMMA line) 

HGAMMA_SIGMA 
float32 
Angstrom 
Fitted line width (in the observed frame) for the HGAMMA line 
HGAMMA_SIGMA_IVAR 
float32 
Angstrom^2 
Inverse variance of the fitted line width (in the observed frame) for the HGAMMA line 
HPXPIXEL 
int64 
HEALPixel containing this location at NSIDE=64 in the NESTED scheme 

IN_DESI 
int16 
Used by fiberassign to make a tile in the DESI footprint; always set to 1 

IN_RADIUS 
float32 
arcsec 
Radius used to set the 
IS_QSO_MGII 
bool 
Boolean: True if the object passes the MgII selection 

IS_QSO_QN 
int16 
Spectroscopic classification from QuasarNET (1 for a quasar) 

KCORR_G0P0 
float64 
gband kcorrection at redshift=0.0 

KCORR_G0P1 
float64 
gband kcorrection at redshift=0.1 

KCORR_R0P0 
float64 
rband kcorrection at redshift=0.0 

KCORR_R0P1 
float64 
rband kcorrection at redshift=0.1 

LAMBDA_REF 
float32 
Angstrom 
Requested wavelength at which targets should be centered on fibers 
LASTNIGHT 
int32 
Final night of observation included in a series of coadds 

LC_FLUX_IVAR_W1 
float32[15] 
nanomaggy^2 
Inverse variance of LC_FLUX_W1 (AB system; defaults to zero for unused entries) 
LC_FLUX_IVAR_W2 
float32[15] 
nanomaggy^2 
Inverse variance of LC_FLUX_W2 (AB system; defaults to zero for unused entries) 
LC_FLUX_W1 
float32[15] 
nanomaggy 
FLUX_W1 in each of up to fifteen unWISE coadd epochs (AB system; defaults to zero for unused entries) 
LC_FLUX_W2 
float32[15] 
nanomaggy 
FLUX_W2 in each of up to fifteen unWISE coadd epochs (AB system; defaults to zero for unused entries) 
LC_MJD_W1 
float64[15] 
MJD_W1 in each of up to fifteen unWISE coadd epochs (defaults to zero for unused entries) 

LC_MJD_W2 
float64[15] 
MJD_W2 in each of up to fifteen unWISE coadd epochs (defaults to zero for unused entries) 

LC_NOBS_W1 
int16[15] 
NOBS_W1 in each of up to fifteen unWISE coadd epochs 

LC_NOBS_W2 
int16[15] 
NOBS_W2 in each of up to fifteen unWISE coadd epochs 

LOCATION 
int64 
Location on the focal plane PETAL_LOC*1000 + DEVICE_LOC 

LOCATION_ASSIGNED 
bool 
True/False for assigned/unassigned for the target in question 

LRG_MASK 
binary 
Imaging mask bits relevant to LRG targets 

MAIN_NSPEC 
int32 
Number of coadded spectra for this TARGETID in Main survey 

MAIN_PRIMARY 
bool 
Boolean flag (True/False) for the primary coadded spectrum in Main survey 

MASKBITS 
int16 
Bitwise mask from the imaging indicating potential issue or blending 

MEAN_DELTA_X 
float32 
mm 
Mean (over exposures) fiber difference requested  actual CS5 X location on focal plane 
MEAN_DELTA_Y 
float32 
mm 
Mean (over exposures) fiber difference requested  actual CS5 Y location on focal plane 
MEAN_FIBER_DEC 
float64 
deg 
Mean (over exposures) DEC of actual fiber position 
MEAN_FIBER_RA 
float64 
deg 
Mean (over exposures) RA of actual fiber position 
MEAN_FIBER_X 
float32 
mm 
Mean (over exposures) fiber CS5 X location on focal plane 
MEAN_FIBER_Y 
float32 
mm 
Mean (over exposures) fiber CS5 Y location on focal plane 
MEAN_PSF_TO_FIBER_SPECFLUX 
float32 
Mean of input exposures fraction of light from pointlike source captured by 1.5 arcsec diameter fiber given atmospheric seeing 

MEDIAN_CALIB_COUNT_B 
float64 
Median of calibrated flux in B camera 

MEDIAN_CALIB_COUNT_R 
float64 
Median of calibrated flux in R camera 

MEDIAN_CALIB_COUNT_Z 
float64 
Median of calibrated flux in Z camera 

MEDIAN_CALIB_SNR_B 
float64 
Median(S/N) of calibrated flux in B camera 

MEDIAN_CALIB_SNR_R 
float64 
Median(S/N) of calibrated flux in R camera 

MEDIAN_CALIB_SNR_Z 
float64 
Median(S/N) of calibrated flux in Z camera 

MEDIAN_FFLAT_COUNT_B 
float64 
Median of fiberflatfielded counts in B camera 

MEDIAN_FFLAT_COUNT_R 
float64 
Median of fiberflatfielded counts in R camera 

MEDIAN_FFLAT_COUNT_Z 
float64 
Median of fiberflatfielded counts in Z camera 

MEDIAN_FFLAT_SNR_B 
float64 
Median(S/N) of fiberflatfielded counts in B camera 

MEDIAN_FFLAT_SNR_R 
float64 
Median(S/N) of fiberflatfielded counts in R camera 

MEDIAN_FFLAT_SNR_Z 
float64 
Median(S/N) of fiberflatfielded counts in Z camera 

MEDIAN_RAW_COUNT_B 
float64 
Median of raw counts in B camera 

MEDIAN_RAW_COUNT_R 
float64 
Median of raw counts in R camera 

MEDIAN_RAW_COUNT_Z 
float64 
Median of raw counts in Z camera 

MEDIAN_RAW_SNR_B 
float64 
Median(raw signal/noise) in B camera 

MEDIAN_RAW_SNR_R 
float64 
Median(raw signal/noise) in R camera 

MEDIAN_RAW_SNR_Z 
float64 
Median(raw signal/noise) in Z camera 

MEDIAN_SKYSUB_COUNT_B 
float64 
Median of skysubtracted counts in B camera 

MEDIAN_SKYSUB_COUNT_R 
float64 
Median of skysubtracted counts in R camera 

MEDIAN_SKYSUB_COUNT_Z 
float64 
Median of skysubtracted counts in Z camera 

MEDIAN_SKYSUB_SNR_B 
float64 
Median(S/N) of skysubtracted counts in B camera 

MEDIAN_SKYSUB_SNR_R 
float64 
Median(S/N) of skysubtracted counts in R camera 

MEDIAN_SKYSUB_SNR_Z 
float64 
Median(S/N) of skysubtracted counts in Z camera 

MJD 
float64 
d 
Modified Julian Date when shutter was opened for this exposure 
MJD_BEGIN 
float64 
d 
Start of the allowed observing window for this target (Modified Julian Date) 
MJD_END 
float64 
d 
End of the allowed observing window for this target (Modified Julian Date) 
MORPHTYPE 
char[4] 
Imaging Surveys morphological type from Tractor 

MWS_TARGET 
int64 
Milky Way Survey targeting bits 

MW_TRANSMISSION_G 
float32 
Milky Way dust transmission in LS gband 

MW_TRANSMISSION_R 
float32 
Milky Way dust transmission in LS rband 

MW_TRANSMISSION_W1 
float32 
Milky Way dust transmission in WISE W1 

MW_TRANSMISSION_W2 
float32 
Milky Way dust transmission in WISE W2 

MW_TRANSMISSION_W3 
float32 
Milky Way dust transmission in WISE W3 

MW_TRANSMISSION_W4 
float32 
Milky Way dust transmission in WISE W4 

MW_TRANSMISSION_Z 
float32 
Milky Way dust transmission in LS zband 

NCOEFF 
int64 
Number of Redrock template coefficients 

NEAR_RADIUS 
float32 
arcsec 
Radius used to set the 
NIGHT 
int32 
Night of observation (YYYYMMDD) starting at local noon before observations start 

NOBS_G 
int16 
Number of images for central pixel in gband 

NOBS_R 
int16 
Number of images for central pixel in rband 

NOBS_Z 
int16 
Number of images for central pixel in zband 

NPIXELS 
int64 
Number of unmasked pixels contributing to the Redrock fit 

NTILE 
int64 
Number of tiles target was available on 

NUMOBS 
int64 
Number of spectroscopic observations (on this specific, single tile) 

NUMOBS_INIT 
int64 
Initial number of observations for target calculated across target selection bitmasks and OBSCONDITIONS 

NUMOBS_MORE 
int64 
Number of additional observations needed 

NUMTARGET 
int16 
Total number of targets that this positioner covered 

NUM_ITER 
int64 
Number of positioner iterations 

NZ 
float64 
h^3 Mpc^3 
The comoving number density of the tracer at the given redshift, assuming complete sample 
O2C 
float64 
The criteria for assessing strength of OII emission for ELG observations 

OBJID 
int32 
Imaging Surveys OBJID on that brick (renamed BRICK_OBJID) 

OBJTYPE 
char[3] 
Object type: TGT, SKY, NON, BAD 

OBSCONDITIONS 
int32 
Bitmask of allowed observing conditions 

OCLAYER 
char[6] 
Either ‘DARK’ for darktime or ‘BRIGHT’ to observe in either bright or darktime 

OIII_CHI2 
float32 
Reduced chi2 of the fit for the [OIII] doublet 

OIII_CONT 
float32 
10**17 erg/(s cm2 Angstrom) 
Continuum used for the fitting (fixed value) for the [OIII] doublet 
OIII_CONT_IVAR 
float32 
10**+34 (s2 cm4 Angstrom2) / erg2 
Inverse variance of the continuum for the [OIII] doublet 
OIII_EW 
float32 
Angstrom 
Fitted restframe equivalent width for the [OIII] doublet 
OIII_EW_IVAR 
float32 
Angstrom^2 
Inverse variance of the fitted restframe equivalent width for the [OIII] doublet 
OIII_FLUX 
float32 
10**17 erg/(s cm2) 
Fitted flux for the [OIII] doublet 
OIII_FLUX_IVAR 
float32 
10**+34 (s2 cm4) / erg2 
Inverse variance of the fitted flux for the [OIII] doublet 
OIII_NDOF 
int32 
Number of degrees of freedom of the fit for the [OIII] doublet 

OIII_SHARE 
float32 
F1/(F0+F1) for the [OIII] doublet, where F0 and F1 are the individual line fluxes (SHARE value fixed during the fit) 

OIII_SHARE_IVAR 
float32 
Infinite value, as SHARE is fixed during the fit 

OIII_SIGMA 
float32 
Angstrom 
Fitted line width (in the observed frame) for the [OIII] doublet 
OIII_SIGMA_IVAR 
float32 
Angstrom^2 
Inverse variance of the fitted line width (in the observed frame) for the [OIII] doublet 
OII_CHI2 
float32 
Reduced chi2 of the fit for the [OII] doublet 

OII_CONT 
float32 
10**17 erg/(s cm2 Angstrom) 
Continuum used for the fitting (fixed value) for the [OII] doublet 
OII_CONT_IVAR 
float32 
10**+34 (s2 cm4 Angstrom2) / erg2 
Inverse variance of the continuum for the [OII] doublet 
OII_EW 
float32 
Angstrom 
Fitted restframe equivalent width for the [OII] doublet 
OII_EW_IVAR 
float32 
Angstrom^2 
Inverse variance of the fitted restframe equivalent width for the [OII] doublet 
OII_FLUX 
float32 
10**17 erg/(s cm2) 
Fitted flux for the [OII] doublet 
OII_FLUX_IVAR 
float32 
10**+34 (s2 cm4) / erg2 
Inverse variance of the fitted flux for the [OII] doublet 
OII_NDOF 
int32 
Number of degrees of freedom of the fit for the [OII] doublet 

OII_SHARE 
float32 
Fitted F1/(F0+F1) for the [OII] doublet, where F0 and F1 are the individual line fluxes 

OII_SHARE_IVAR 
float32 
Inverse variance of the fitted F1/(F0+F1) for the [OII] doublet 

OII_SIGMA 
float32 
Angstrom 
Fitted line width (in the observed frame) for the [OII] doublet 
OII_SIGMA_IVAR 
float32 
Angstrom^2 
Inverse variance of the fitted line width (in the observed frame) for the [OII] doublet 
PARALLAX 
float32 
mas 
Reference catalog parallax 
PARALLAX_IVAR 
float32 
mas^2 
Inverse variance of PARALLAX 
PETAL_LOC 
int16 
Petal location [09] 

PHOTSYS 
char[1] 
‘N’ for the MzLS/BASS photometric system, ‘S’ for DECaLS 

PLATE_DEC 
float64 
deg 
Barycentric Declination in ICRS to be used by PlateMaker 
PLATE_RA 
float64 
deg 
Barycentric Right Ascension in ICRS to be used by PlateMaker 
PLATE_REF_EPOCH 
float64 
yr 
Copy of REF_EPOCH to be used by PlateMaker 
PMDEC 
float32 
mas yr^1 
Proper motion in the +Dec direction 
PMDEC_IVAR 
float32 
yr^2 mas^2 
Inverse variance of PMDEC 
PMRA 
float32 
mas yr^1 
proper motion in the +RA direction (already including cos(dec)) 
PMRA_IVAR 
float32 
yr^2 mas^2 
Inverse variance of PMRA 
PRIORITY 
int32 
Target current priority 

PRIORITY_INIT 
int64 
Target initial priority from target selection bitmasks and OBSCONDITIONS 

PROBA_RF 
float32 
Probability of being a quasar generated by the quasar Random Forest targeting algorithm. 

PROB_OBS 
float64 
The number alternative assignment histories that the target was assigned in divided by 128 

PROGRAM 
char[6] 
DESI program type  BRIGHT, DARK, BACKUP, OTHER 

PSFDEPTH_G 
float32 
nanomaggy^2 
PSFbased depth in gband 
PSFDEPTH_R 
float32 
nanomaggy^2 
PSFbased depth in rband 
PSFDEPTH_W1 
float32 
nanomaggy^2 
PSFbased depth in WISE W1 
PSFDEPTH_W2 
float32 
nanomaggy^2 
PSFbased depth in WISE W2 
PSFDEPTH_Z 
float32 
nanomaggy^2 
PSFbased depth in zband 
PSFSIZE_G 
float32 
arcsec 
Median PSF size evaluated at the BRICK_PRIMARY objects in this brick in gband 
PSFSIZE_R 
float32 
arcsec 
Median PSF size evaluated at the BRICK_PRIMARY objects in this brick in rband 
PSFSIZE_Z 
float32 
arcsec 
Median PSF size evaluated at the BRICK_PRIMARY objects in this brick in zband 
PSF_TO_FIBER_SPECFLUX 
float64 
fraction of light from pointlike source captured by 1.5 arcsec diameter fiber given atmospheric seeing 

RA 
float64 
deg 
Barycentric Right Ascension in ICRS 
RA_IVAR 
float32 
deg^2 
Inverse variance of RA (no cosine term!), excluding astrometric calibration errors 
REF_CAT 
char[2] 
Reference catalog source for star: ‘T2’ for Tycho2, ‘G2’ for Gaia DR2, ‘L2’ for the SGA, empty otherwise 

REF_EPOCH 
float32 
yr 
Reference epoch for Gaia/Tycho astrometry. Typically 2015.5 for Gaia 
REF_ID 
int64 
Tyc1*1,000,000+Tyc2*10+Tyc3 for Tycho2; 

REF_MAG 
float32 
mag 
Magnitude used to calculate 
RELEASE 
int16 
Imaging surveys release ID 

REST_GMR_0P0 
float64 
Restframe gr colour at redshift=0.0 

REST_GMR_0P1 
float64 
Restframe gr colour at redshift=0.1 

RMS_DELTA_X 
float32 
mm 
RMS (over exposures) of the fiber difference between measured and requested CS5 X location on focal plane 
RMS_DELTA_Y 
float32 
mm 
RMS (over exposures) of the fiber difference between measured and requested CS5 Y location on focal plane 
ROSETTE_NUMBER 
int32 
Rosette number ID [019] 

ROSETTE_R 
float64 
deg 
Radius from the center of the rosette to the target 
SCND_TARGET 
int64 
Target selection bitmask for secondary programs 

SCND_ORDER 
int32 
Number of row for target entry in secondary file (placeholder; needed by fiberassign) 

SEEING_ETC 
float64 
arcsec 
Average FWHM atmospheric seeing during this exposure as measured by ETC 
SEEING_GFA 
float64 
arcsec 
Average FWHM atmospheric seeing during this exposure as measured by GFA 
SERSIC 
float32 
Powerlaw index for the Sersic profile model (MORPHTYPE=’SER’) 

SERSIC_IVAR 
float32 
Inverse variance of SERSIC 

SHAPEDEV_E1 
float32 
deVaucouleurs shape fit elipticity parameter e1 

SHAPEDEV_E1_IVAR 
float32 
Inverse variance of SHAPEDEV_E1 

SHAPEDEV_E2 
float32 
deVaucouleurs shape fit elipticity parameter e2 

SHAPEDEV_E2_IVAR 
float32 
Inverse variance of SHAPEDEV_E2 

SHAPEDEV_R 
float32 
arcsec 
deVaucouleurs shape halflight radius 
SHAPEDEV_R_IVAR 
float32 
arcsec^2 
Inverse variance of SHAPEDEV_R 
SHAPEEXP_E1 
float32 
Imaging exponential shape fit elipticity parameter e1 

SHAPEEXP_E1_IVAR 
float32 
Inverse variance of SHAPEEXP_E1 

SHAPEEXP_E2 
float32 
Imaging exponential shape fit elipticity parameter e2 

SHAPEEXP_E2_IVAR 
float32 
Inverse variance of SHAPEEXP_E2 

SHAPEEXP_R 
float32 
arcsec 
Imaging exponential shape halflight radius 
SHAPEEXP_R_IVAR 
float32 
arcsec^2 
Inverse variance of SHAPEEXP_R 
SHAPE_E1 
float32 
Ellipticity component 1 of galaxy model for galaxy type MORPHTYPE 

SHAPE_E1_IVAR 
float32 
Inverse variance of SHAPE_E1 

SHAPE_E2 
float32 
Ellipticity component 2 of galaxy model for galaxy type MORPHTYPE 

SHAPE_E2_IVAR 
float32 
Inverse variance of SHAPE_E2 

SHAPE_R 
float32 
arcsec 
Halflight radius of galaxy model (>0) 
SHAPE_R_IVAR 
float32 
arcsec^2 
Inverse variance of SHAPE_R 
SIGMA_MGII 
float32 
Angstrom 
Fitted parameter SIGMA (linewidth) by MgII fitter (in angstrom?) 
SPECTRO 
int16 
Spectrograph number [09] 

SPECTROID 
int32 
Hardware ID of spectrograph (not used) 

SPECTYPE 
char[6] 
Spectral type of Redrock best fit template (e.g. GALAXY, QSO, STAR) 

SPGRPVAL 
int32 
Value by which spectra are grouped for a coadd (e.g. a YEARMMDD night) 

STD_FIBER_DEC 
float32 
arcsec 
Standard deviation (over exposures) of DEC of actual fiber position 
STD_FIBER_RA 
float32 
arcsec 
Standard deviation (over exposures) of RA of actual fiber position 
SUBPRIORITY 
float64 
Random subpriority [01) to break assignment ties 

SUBTYPE 
char[20] 
Spectral subtype 

SUM_CALIB_COUNT_B 
float64 
Sum of calibrated flux in B camera 

SUM_CALIB_COUNT_R 
float64 
Sum of calibrated flux in R camera 

SUM_CALIB_COUNT_Z 
float64 
Sum of calibrated flux in Z camera 

SUM_FFLAT_COUNT_B 
float64 
Sum of fiberflatfielded counts B camera 

SUM_FFLAT_COUNT_R 
float64 
Sum of fiberflatfielded counts R camera 

SUM_FFLAT_COUNT_Z 
float64 
Sum of fiberflatfielded counts Z camera 

SUM_RAW_COUNT_B 
float64 
Sum of raw counts in B camera 

SUM_RAW_COUNT_R 
float64 
Sum of raw counts in R camera 

SUM_RAW_COUNT_Z 
float64 
Sum of raw counts in Z camera 

SUM_SKYSUB_COUNT_B 
float64 
Sum of skysubtracted counts in B camera 

SUM_SKYSUB_COUNT_R 
float64 
Sum of skysubtracted counts in R camera 

SUM_SKYSUB_COUNT_Z 
float64 
Sum of skysubtracted counts in Z camera 

SURVEY 
char[7] 
Survey name 

SV1_BGS_TARGET 
int64 
BGS (bright time program) target selection bitmask for SV1 

SV1_DESI_TARGET 
int64 
DESI (dark time program) target selection bitmask for SV1 

SV1_MWS_TARGET 
int64 
MWS (bright time program) target selection bitmask for SV1 

SV1_SCND_TARGET 
int64 
Secondary target selection bitmask for SV1 

SV2_BGS_TARGET 
int64 
BGS (bright time program) target selection bitmask for SV2 

SV2_DESI_TARGET 
int64 
DESI (dark time program) target selection bitmask for SV2 

SV2_MWS_TARGET 
int64 
MWS (bright time program) target selection bitmask for SV2 

SV2_SCND_TARGET 
int64 
Secondary target selection bitmask for SV2 

SV3_BGS_TARGET 
int64 
BGS (bright time program) target selection bitmask for SV3 

SV3_DESI_TARGET 
int64 
DESI (dark time program) target selection bitmask for SV3 

SV3_MWS_TARGET 
int64 
MWS (bright time program) target selection bitmask for SV3 

SV3_SCND_TARGET 
int64 
Secondary target selection bitmask for SV3 

SV_NSPEC 
int32 
Number of coadded spectra for this TARGETID in SV (SV1+2+3) 

SV_PRIMARY 
bool 
Boolean flag (True/False) for the primary coadded spectrum in SV (SV1+2+3) 

TARGETID 
int64 
Unique DESI target ID 

TARGET_DEC 
float64 
deg 
Barycentric declination in ICRS 
TARGET_RA 
float64 
deg 
Barycentric right ascension in ICRS 
TARGET_STATE 
char[*] 
Combination of target class and its current observational state 

TILEDEC 
float64 
deg 
Barycentric declination of tile center in ICRS 
TILEID 
int32 
Unique DESI tile ID 

TILELOCID 
int64 
Is 10000*TILEID+LOCATION 

TILELOCIDS 
char[*] 
TILELOCIDs that the target was available for, separated by ‘’ 

TILELOCID_ASSIGNED 
int64 
0/1 for unassigned/assigned for TILELOCID in question (it could have been assigned to a different target) 

TILERA 
float64 
deg 
Barycentric Right Ascension of tile center in ICRS 
TILES 
char[*] 
TILEIDs of those tile, in string form separated by ‘’ 

TIMESTAMP 
str 
s 
UTC/ISO time at which the target state was updated 
TOOID 
int64 
ID for this target assigned by the 

TOO_PRIO 
char[2] 
Either ‘HI’ for a veryhighpriority target or ‘LO’ for a verylowpriority target 

TOO_TYPE 
char[5] 
Either ‘TILE’ for a special tile or ‘FIBER’ for a fiberoverride ToO 

TSNR2_BGS 
float32 
BGS template (S/N)^2 summed over B,R,Z 

TSNR2_BGS_B 
float32 
BGS B template (S/N)^2 

TSNR2_BGS_R 
float32 
BGS R template (S/N)^2 

TSNR2_BGS_Z 
float32 
BGS Z template (S/N)^2 

TSNR2_ELG 
float32 
ELG template (S/N)^2 summed over B,R,Z 

TSNR2_ELG_B 
float32 
ELG B template (S/N)^2 

TSNR2_ELG_R 
float32 
ELG R template (S/N)^2 

TSNR2_ELG_Z 
float32 
ELG Z template (S/N)^2 

TSNR2_GPBBACKUP 
float64 
template (S/N)^2 for backup targets in guider pass band 

TSNR2_GPBBACKUP_B 
float64 
template (S/N)^2 for backup targets in guider pass band on B 

TSNR2_GPBBACKUP_R 
float64 
template (S/N)^2 for backup targets in guider pass band on R 

TSNR2_GPBBACKUP_Z 
float64 
template (S/N)^2 for backup targets in guider pass band on Z 

TSNR2_GPBBRIGHT 
float64 
template (S/N)^2 for bright targets in guider pass band 

TSNR2_GPBBRIGHT_B 
float64 
template (S/N)^2 for bright targets in guider pass band on B 

TSNR2_GPBBRIGHT_R 
float64 
template (S/N)^2 for bright targets in guider pass band on R 

TSNR2_GPBBRIGHT_Z 
float64 
template (S/N)^2 for bright targets in guider pass band on Z 

TSNR2_GPBDARK 
float64 
template (S/N)^2 for dark targets in guider pass band 

TSNR2_GPBDARK_B 
float64 
template (S/N)^2 for dark targets in guider pass band on B 

TSNR2_GPBDARK_R 
float64 
template (S/N)^2 for dark targets in guider pass band on R 

TSNR2_GPBDARK_Z 
float64 
template (S/N)^2 for dark targets in guider pass band on Z 

TSNR2_LRG 
float32 
LRG template (S/N)^2 summed over B,R,Z 

TSNR2_LRG_B 
float32 
LRG B template (S/N)^2 

TSNR2_LRG_R 
float32 
LRG R template (S/N)^2 

TSNR2_LRG_Z 
float32 
LRG Z template (S/N)^2 

TSNR2_LYA 
float32 
LYA template (S/N)^2 summed over B,R,Z 

TSNR2_LYA_B 
float32 
LYA B template (S/N)^2 

TSNR2_LYA_R 
float32 
LYA R template (S/N)^2 

TSNR2_LYA_Z 
float32 
LYA Z template (S/N)^2 

TSNR2_QSO 
float32 
QSO template (S/N)^2 summed over B,R,Z 

TSNR2_QSO_B 
float32 
QSO B template (S/N)^2 

TSNR2_QSO_R 
float32 
QSO R template (S/N)^2 

TSNR2_QSO_Z 
float32 
QSO Z template (S/N)^2 

TYPE 
char[4] 
Morphological Model type from Tractor; renamed MORPHTYPE in most files 

URAT_ID 
int64 
ID in the URAT catalog for sources where URAT supplemented missing Gaia astrometric information 

URAT_SEP 
float32 
arcsec 
Separation between URAT and Gaia sources where URAT supplemented missing Gaia astrometric information 
VAR_A_MGII 
float32 
Variance of MgII fit amplitude parameter A 

VAR_B_MGII 
float32 
Variance of MgII fit offset parameter B 

VAR_SIGMA_MGII 
float32 
Variance of MgII fit width parameter sigma 

VERSION 
char[14] 
Tag of desitarget used to create the target catalog 

WEIGHT 
float64 
The combination of all weights to use 

WEIGHT_COMP 
float64 
1/FRACZ_TILELOCID 

WEIGHT_FKP 
float64 
1/(1+NZ*P0), with P0 different for each tracer 

WEIGHT_SYS 
float64 
Correction for fluctuations in projected density with imaging conditions, from random forrest method 

WEIGHT_SYSEB 
float64 
Correction for fluctuations in projected density with imaging conditions, from linear regression method applied to eBOSS 

WEIGHT_ZFAIL 
float64 
Should be all 1 at this point for main survey 

WISEMASK_W1 
byte 
Bitwise mask for WISE W1 data 

WISEMASK_W2 
byte 
Bitwise mask for WISE W2 data 

Z 
float64 
Redshift measured by Redrock 

ZCAT_NSPEC 
int32 
Number of times this TARGETID appears in this catalog 

ZCAT_PRIMARY 
bool 
Boolean flag (True/False) for the primary coadded spectrum in this zcatalog 

ZERR 
float64 
Redshift error from redrock 

ZPOSSLOC 
bool 
True/False whether the location could have been assigned to the given target class 

ZTILEID 
int32 
ID of tile that most recently updated target’s state 

ZWARN 
int64 
Redshift warning bitmask from Redrock 

ZWARN_MTL 
int64 
The ZWARN from the zmtl file (contains extra bits) 

Z_CIII 
float64 
Redshift estimated by QuasarNET with CIII line 

Z_CIV 
float64 
Redshift estimated by QuasarNET with CIV line 

Z_Halpha 
float64 
Redshift estimated by QuasarNET with Halpha line 

Z_Hbeta 
float64 
Redshift estimated by QuasarNET with Hbeta line 

Z_HP 
float64 
Redshift from Healpix coadd 

Z_LYA 
float64 
Redshift estimated by QuasarNET with LyA line 

Z_MgII 
float64 
Redshift estimated by QuasarNET with MgII line 

Z_QN 
float64 
Redshift measured by QuasarNET using line with highest confidence 

Z_QN_CONF 
float64 
Redshift confidence from QuasarNET 

Z_RR 
float64 
Redshift collected from redrock file 