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| Storage | Field name | Units | Description | Default | All | Provenance field name | File | HDU |
|---|---|---|---|---|---|---|---|---|
| A | cz | None | z of Normal unit vector in J2000 | False | True | CZ | specObj-dr16 | 1 |
| A | special_target2 | None | Secondary (calibration) target flags for SDSS-I and SDSS-II special program targets | False | True | SPECIAL_TARGET2 | specObj-dr16 | 1 |
| A | eboss_target_id | None | EBOSS unique target identifier for every spectroscopic target | False | True | EBOSS_TARGET_ID | specObj-dr16 | 1 |
| A | thing_id | None | Resolve THING_ID in SDSS imaging for best positional match | False | True | THING_ID | specObj-dr16 | 1 |
| A | run1d | None | Spectroscopic 1D reduction (redshift and classification) name | False | True | RUN1D | specObj-dr16 | 1 |
| A | targetobjid | None | Unique database ID of targeting object based on RUN, RERUN, CAMCOl, FIELD, ID (same as SkyServer version) | False | True | TARGETOBJID | specObj-dr16 | 1 |
| A | targettype | None | General type of target (SCIENCE, STANDARD, or SKY) | False | True | TARGETTYPE | specObj-dr16 | 1 |
| A | legacy_target2 | None | Secondary (calibration) target flags for SDSS-I and SDSS-II Legacy survey | False | True | LEGACY_TARGET2 | specObj-dr16 | 1 |
| A | spectrographid | None | Which spectrograph (1 or 2) | False | True | SPECTROGRAPHID | specObj-dr16 | 1 |
| A | vdispz_err | None | Error in redshift associated with best-fit velocity dispersion | False | True | VDISPZ_ERR | specObj-dr16 | 1 |
| A | zoffset | micron | Washer thickness used for backstopping BOSS quasar targets, so they are closer to 4000 Angstrom focal plan | False | True | ZOFFSET | specObj-dr16 | 1 |
| A | eboss_target1 | None | eBOSS, TDSS and SPIDERS target selection flags for main eBOSS survey | False | True | EBOSS_TARGET1 | specObj-dr16 | 1 |
| A | chi68p | None | 68-th percentile value of abs(chi) of the best-fit synthetic spectrum to the actual spectrum (around 1.0 for a good fit) | False | True | CHI68P | specObj-dr16 | 1 |
| A | segue2_target1 | None | Primary (science) target flags for SEGUE-2 targets | False | True | SEGUE2_TARGET1 | specObj-dr16 | 1 |
| A | firstrelease | None | Name of first release this PLATE, MJD, FIBERID, RUN2D was associated with | False | True | FIRSTRELEASE | specObj-dr16 | 1 |
| A | eboss_target0 | None | SEQUELS, TDSS and SPIDERS target selection flags | False | True | EBOSS_TARGET0 | specObj-dr16 | 1 |
| A | fiberid | None | Fiber number | False | True | FIBERID | specObj-dr16 | 1 |
| A | specboss | None | Set to 1 for primary BOSS spectrograph observation of object, 0 otherwise | False | True | SPECBOSS | specObj-dr16 | 1 |
| A | z_conf_person | None | Visual-inspection confidence (0=not inspected or no confidence, 1,2=low confidence, 3,4=high confidence) | False | True | Z_CONF_PERSON | specObj-dr16 | 1 |
| A | programname | None | Program within each survey that the plate was part of | False | True | PROGRAMNAME | specObj-dr16 | 1 |
| A | marvels_target2 | None | Secondary (calibration) target flags for MARVELS targets | False | True | MARVELS_TARGET2 | specObj-dr16 | 1 |
| A | yfocal | mm | Hole position on plate (+Y = +DEC) | False | True | YFOCAL | specObj-dr16 | 1 |
| A | elodie_feh | None | Metallicity [Fe/H] of ELODIE star | False | True | ELODIE_FEH | specObj-dr16 | 1 |
| A | segue1_target1 | None | Primary (science) target flags for SEGUE-1 targets | False | True | SEGUE1_TARGET1 | specObj-dr16 | 1 |
| A | elodie_z_modelerr | None | Standard deviation in redshift among the 12 best-fit ELODIE stars | False | True | ELODIE_Z_MODELERR | specObj-dr16 | 1 |
| A | specsegue | None | Set to 1 for primary SDSS SEGUE program observation of object (including SEGUE-1 and SEGUE-2), 0 otherwise | False | True | SPECSEGUE | specObj-dr16 | 1 |
| A | boss_target1 | None | Primary (science) target flags for BOSS targets | False | True | BOSS_TARGET1 | specObj-dr16 | 1 |
| A | elodie_dof | None | Degrees of freedom in fit to best ELODIE star | False | True | ELODIE_DOF | specObj-dr16 | 1 |
| A | specsegue1 | None | Set to 1 for primary SDSS SEGUE-1 program observation of object, 0 otherwise | False | True | SPECSEGUE1 | specObj-dr16 | 1 |
| A | spec2_i | None | Signal-to-noise squared for spectrograph #2, at i=19.90 for SDSS spectrograph spectra, i=20.20 for BOSS spectrograph spectra | False | True | SPEC2_I | specObj-dr16 | 1 |
| A | tile | None | Tile number (each tile can have several plates drilled for it) | False | True | TILE | specObj-dr16 | 1 |
| A | rchi2diff_noqso | None | Difference in reduced chi-squared between best and second best fit for Z_NOQSO redshift | False | True | RCHI2DIFF_NOQSO | specObj-dr16 | 1 |
| A | boss_target2 | None | Always set to zero (placeholder for BOSS target flags never used) | False | True | BOSS_TARGET2 | specObj-dr16 | 1 |
| A | class_noqso | None | Spectroscopic classification for Z_NOQSO redshift | False | True | CLASS_NOQSO | specObj-dr16 | 1 |
| A | rchi2diff | None | Difference in reduced chi-squared between best and second best fit | False | True | RCHI2DIFF | specObj-dr16 | 1 |
| A | elodie_logg | None | log10(gravity) of ELODIE star | False | True | ELODIE_LOGG | specObj-dr16 | 1 |
| A | elodie_bv | mag | (B-V) color index for ELODIE star | False | True | ELODIE_BV | specObj-dr16 | 1 |
| A | segue2_target2 | None | Secondary (calibration) target flags for SEGUE-2 targets | False | True | SEGUE2_TARGET2 | specObj-dr16 | 1 |
| A | snturnoff | None | Signal to noise measure for MS turnoff stars on plate (-9999 if not appropriate) | False | True | SNTURNOFF | specObj-dr16 | 1 |
| A | class_person | None | Visual-inspection classification (0=not inspected or unknown, 1=star, 2=narrow emission-line galaxy, 3=QSO, 4=galaxy) | False | True | CLASS_PERSON | specObj-dr16 | 1 |
| A | thing_id_targeting | None | Resolve THING_ID in SDSS imaging for targeted object | False | True | THING_ID_TARGETING | specObj-dr16 | 1 |
| A | npoly | None | Number of polynomial terms in fit | False | True | NPOLY | specObj-dr16 | 1 |
| A | elodie_teff | Kelvin | Effective temperature of ELODIE star | False | True | ELODIE_TEFF | specObj-dr16 | 1 |
| A | spec2_g | None | Signal-to-noise squared for spectrograph #2, at g=20.20 for SDSS spectrograph spectra, g=21.20 for BOSS spectrograph spectra | False | True | SPEC2_G | specObj-dr16 | 1 |
| A | fluxobjid | None | Unique database ID of flux-based photometric match based on RUN, RERUN, CAMCOl, FIELD, ID (same as SkyServer version) | False | True | FLUXOBJID | specObj-dr16 | 1 |
| A | vdispchi2 | None | Chi-squared for best-fit velocity dispersion | False | True | VDISPCHI2 | specObj-dr16 | 1 |
| A | anyormask | None | For each bit, records whether any pixel in the spectrum has that bit set in its ORMASK | False | True | ANYORMASK | specObj-dr16 | 1 |
| A | spectroflux_ivar | nanomaggy-2 | Inverse variance of spectrum projected onto ugriz filters | False | True | SPECTROFLUX_IVAR | specObj-dr16 | 1 |
| A | plate | None | Plate number (each plate corresponds to an actual plug plate) | False | True | PLATE | specObj-dr16 | 1 |
| A | marvels_target1 | None | Primary (science) target flags for MARVELS targets | False | True | MARVELS_TARGET1 | specObj-dr16 | 1 |
| A | boss_specobj_id | None | Identification number internal to BOSS for SPECBOSS=1 objects | False | True | BOSS_SPECOBJ_ID | specObj-dr16 | 1 |
| A | special_target1 | None | Primary (science) target flags for SDSS-I and SDSS-II special program targets | False | True | SPECIAL_TARGET1 | specObj-dr16 | 1 |
| A | objid | None | SDSS photometric object identification numbers (RUN, RERUN, CAMCOL, FIELD, ID) | False | True | OBJID | specObj-dr16 | 1 |
| A | dof | None | Number of degrees of freedom in best fit | False | True | DOF | specObj-dr16 | 1 |
| A | calibflux | nanomaggy | ugriz fluxes used for calibrations | False | True | CALIBFLUX | specObj-dr16 | 1 |
| A | lambda_eff | AA | Effective wavelength drilling position was optimized for | False | True | LAMBDA_EFF | specObj-dr16 | 1 |
| A | vdispnpix | None | Number of pixels overlapping the templates used in the velocity dispersion fit | False | True | VDISPNPIX | specObj-dr16 | 1 |
| A | z_person | None | Visual-inspection redshift | False | True | Z_PERSON | specObj-dr16 | 1 |
| A | spectroflux | nanomaggy | Spectrum projected onto ugriz filters | False | True | SPECTROFLUX | specObj-dr16 | 1 |
| A | xfocal | mm | Hole position on plate (+X = +RA) | False | True | XFOCAL | specObj-dr16 | 1 |
| A | fracnsiglo | None | Fraction of pixels low by more than N sigma relative to best-fit (for 1,2,..,10 sigma) | False | True | FRACNSIGLO | specObj-dr16 | 1 |
| A | sn_median | None | Median signal-to-noise per pixel within each of the ugriz bandpasses | False | True | SN_MEDIAN | specObj-dr16 | 1 |
| A | anyandmask | None | For each bit, records whether any pixel in the spectrum has that bit set in its ANDMASK | False | True | ANYANDMASK | specObj-dr16 | 1 |
| A | spec1_r | None | Signal-to-noise squared for spectrograph #1, at r=20.25 for SDSS spectrograph spectra, r=20.20 for BOSS spectrograph spectra | False | True | SPEC1_R | specObj-dr16 | 1 |
| A | elodie_object | None | Star name for ELODIE star | False | True | ELODIE_OBJECT | specObj-dr16 | 1 |
| A | segue1_target2 | None | Primary (science) target flags for SEGUE-1 targets | False | True | SEGUE1_TARGET2 | specObj-dr16 | 1 |
| A | speclegacy | None | Set to 1 for primary SDSS Legacy program observation of object, 0 otherwise | False | True | SPECLEGACY | specObj-dr16 | 1 |
| A | spectrosynflux_ivar | nanomaggy-2 | Inverse variance of best-fit template spectrum projected onto ugriz filters | False | True | SPECTROSYNFLUX_IVAR | specObj-dr16 | 1 |
| A | legacy_target1 | None | Primary (science) target flags for SDSS-I and SDSS-II Legacy survey | False | True | LEGACY_TARGET1 | specObj-dr16 | 1 |
| A | designid | None | Design identification number for plate | False | True | DESIGNID | specObj-dr16 | 1 |
| A | ancillary_target2 | None | BOSS ancillary target selection information at plate design | False | True | ANCILLARY_TARGET2 | specObj-dr16 | 1 |
| A | elodie_rchi2 | None | Reduced chi-squared of fit to best ELODIE star | False | True | ELODIE_RCHI2 | specObj-dr16 | 1 |
| A | eboss_target2 | None | eBOSS, TDSS and SPIDERS target selection flags for main eBOSS survey | False | True | EBOSS_TARGET2 | specObj-dr16 | 1 |
| A | platequality | None | Final quality of plate this spectrum came from (good, marginal, or bad) | False | True | PLATEQUALITY | specObj-dr16 | 1 |
| A | platesn2 | None | Overall signal-to-noise-squared measure for plate (only for SDSS spectrograph plates) | False | True | PLATESN2 | specObj-dr16 | 1 |
| A | spec1_i | None | Signal-to-noise squared for spectrograph #1, at i=19.90 for SDSS spectrograph spectra, i=20.20 for BOSS spectrograph spectra | False | True | SPEC1_I | specObj-dr16 | 1 |
| A | comments_person | None | Visual-inspection comments | False | True | COMMENTS_PERSON | specObj-dr16 | 1 |
| A | tcolumn | None | Columns of template files that correspond to each template | False | True | TCOLUMN | specObj-dr16 | 1 |
| A | z_err_noqso | None | Error in Z_NOQSO redshift | False | True | Z_ERR_NOQSO | specObj-dr16 | 1 |
| A | platerun | None | Drilling run that this plate was drilled in | False | True | PLATERUN | specObj-dr16 | 1 |
| A | run2d | None | Spectroscopic 2D reduction (extraction of spectra) name | False | True | RUN2D | specObj-dr16 | 1 |
| A | subclass | None | Best spectroscopic subclassification | False | True | SUBCLASS | specObj-dr16 | 1 |
| A | plateid | None | Unique database ID of plate based on PLATE, MJD, RUN2D (same as SkyServer version) | False | True | PLATEID | specObj-dr16 | 1 |
| A | vdispz | None | Redshift associated with best-fit velocity dispersion | False | True | VDISPZ | specObj-dr16 | 1 |
| A | mjd | days | Modified Julian Day of observation | False | True | MJD | specObj-dr16 | 1 |
| A | tfile | None | File that best fit template comes from in idlspec2d product | False | True | TFILE | specObj-dr16 | 1 |
| A | spec1_g | None | Signal-to-noise squared for spectrograph #1, at g=20.20 for SDSS spectrograph spectra, g=21.20 for BOSS spectrograph spectra | False | True | SPEC1_G | specObj-dr16 | 1 |
| A | cy | None | y of Normal unit vector in J2000 | False | True | CY | specObj-dr16 | 1 |
| A | sn_median_all | None | Median signal-to-noise per pixel across full spectrum | False | True | SN_MEDIAN_ALL | specObj-dr16 | 1 |
| A | vdispdof | None | Number of degrees of freedom in velocity dispersion fit | False | True | VDISPDOF | specObj-dr16 | 1 |
| A | nspecobs | None | Number of spectroscopic observations of this source | False | True | NSPECOBS | specObj-dr16 | 1 |
| A | bluefiber | None | Set to 1 if this hole was designated a blue fiber, 0 if designated a red fiber (high redshift LRGs are preferentially in red fibers) | False | True | BLUEFIBER | specObj-dr16 | 1 |
| A | sourcetype | None | String expressing type of source (similar to OBJTYPE in DR8 and earlier) | False | True | SOURCETYPE | specObj-dr16 | 1 |
| A | spec2_r | None | Signal-to-noise squared for spectrograph #2, at r=20.25 for SDSS spectrograph spectra, r=20.20 for BOSS spectrograph spectra | False | True | SPEC2_R | specObj-dr16 | 1 |
| A | elodie_z_err | None | Error in redshift fit to ELODIE star | False | True | ELODIE_Z_ERR | specObj-dr16 | 1 |
| A | ancillary_target1 | None | BOSS ancillary science target selection information at plate design | False | True | ANCILLARY_TARGET1 | specObj-dr16 | 1 |
| A | specsdss | None | Set to 1 for primary SDSS spectrograph observation of object, 0 otherwise | False | True | SPECSDSS | specObj-dr16 | 1 |
| A | wcoverage | None | Coverage in wavelength, in units of log10 wavelength | False | True | WCOVERAGE | specObj-dr16 | 1 |
| A | spectrosynflux | nanomaggy | Best-fit template spectrum projected onto ugriz filters | False | True | SPECTROSYNFLUX | specObj-dr16 | 1 |
| A | rchi2 | None | Reduced chi-squared of best fit | False | True | RCHI2 | specObj-dr16 | 1 |
| A | elodie_filename | None | File name for best-fit ELODIE star | False | True | ELODIE_FILENAME | specObj-dr16 | 1 |
| A | vdisp | km s-1 | Velocity dispersion | False | True | VDISP | specObj-dr16 | 1 |
| A | fracnsighi | None | Fraction of pixels high by more than N sigma relative to best-fit (for 1,2,..,10 sigma) | False | True | FRACNSIGHI | specObj-dr16 | 1 |
| A | z_noqso | None | Best redshift when ignoring QSO fits, recommended for BOSS CMASS and LOWZ targets; calculated only for survey=boss spectra, not for any SDSS spectrograph data | False | True | Z_NOQSO | specObj-dr16 | 1 |
| A | deredsn2 | None | Dereddened overall signal-to-noise-squared measure for plate (only for BOSS spectrograph plates) | False | True | DEREDSN2 | specObj-dr16 | 1 |
| A | elodie_z | None | Redshift fit to ELODIE star | False | True | ELODIE_Z | specObj-dr16 | 1 |
| A | vdisp_err | km s-1 | Error in velocity dispersion | False | True | VDISP_ERR | specObj-dr16 | 1 |
| A | elodie_sptype | None | ELODIE star spectral type | False | True | ELODIE_SPTYPE | specObj-dr16 | 1 |
| A | sectarget | None | Deprecated version of secondary (calibration) target flags (meanings highly overloaded) | False | True | SECTARGET | specObj-dr16 | 1 |
| A | specsegue2 | None | Set to 1 for primary SDSS SEGUE-2 program observation of object, 0 otherwise | False | True | SPECSEGUE2 | specObj-dr16 | 1 |
| A | subclass_noqso | None | Spectroscopic subclassification for Z_NOQSO redshift | False | True | SUBCLASS_NOQSO | specObj-dr16 | 1 |
| A | calibflux_ivar | nanomaggy-2 | Inverse variances of ugriz fluxes used for calibrations | False | True | CALIBFLUX_IVAR | specObj-dr16 | 1 |
| A | nturnoff | None | Number of stars used for SNTURNOFF determination | False | True | NTURNOFF | specObj-dr16 | 1 |
| A | fracnsigma | None | Fraction of pixels deviant by more than N sigma relative to best-fit (for 1,2,..,10 sigma) | False | True | FRACNSIGMA | specObj-dr16 | 1 |
| A | spectroskyflux | nanomaggy | Sky flux in each of the ugriz imaging filters | False | True | SPECTROSKYFLUX | specObj-dr16 | 1 |
| A | chunk | None | Name of tiling chunk that this spectrum was tiled in (boss1, boss2, etc), important for tracking large-scale structure samples | False | True | CHUNK | specObj-dr16 | 1 |
| A | cx | None | x of Normal unit vector in J2000 | False | True | CX | specObj-dr16 | 1 |
| A | theta | None | Template coefficients of best fit | False | True | THETA | specObj-dr16 | 1 |
| A | zwarning_noqso | None | Warnings in z_noqso redshift (BOSS spectra only) | False | True | ZWARNING_NOQSO | specObj-dr16 | 1 |
| A | primtarget | None | Target selection information at plate design, primary science selection (for backwards compatibility) | False | True | PRIMTARGET | specObj-dr16 | 1 |
| A | survey | None | Survey name | False | True | SURVEY | specObj-dr16 | 1 |
| C | ra | deg | Right Ascension in degrees | True | True | PLUG_RA | spZbest | 1 |
| C | dateobs | None | Range of observational dates for a given spectrum (single value for a single date) | False | True | DATE-OBS | spPlate | 0 |
| C | redshift_warning | None | Bitmask with warning on redshift result | False | True | ZWARNING | spZbest | 1 |
| C | dateobs_center | None | Central value of the dateobs range | False | True | DATE-OBS | spPlate | 0 |
| C | updated | None | Date and time when the record was created/updated | False | False | N/A | N/A | N/A |
| C | site | None | [Categorical] Site of observations | False | True | N/A | N/A | N/A |
| C | datasetgroup | None | [Categorical] Common name for a coherent set of spectra published as a single release (e.g., SDSS_BOSS) | False | True | N/A | N/A | N/A |
| C | specid | None | Dataset-specific spectrum identifier (may not be unique) | True | True | SPECOBJID | specObj-dr16 | 1 |
| C | instrument | None | [Categorical] Instrument used for observation | False | True | N/A | N/A | N/A |
| C | redshift | None | Measured redshift, or radial velocity in units of redshift | False | True | Z | spZbest | 1 |
| C | targetid | None | Dataset-specific photometric target identifier | False | True | BESTOBJID | specObj-dr16 | 1 |
| C | specprimary | None | Whether an entry is the primary spectrum for a given target object | False | True | SPECPRIMARY | specObj-dr16 | 1 |
| C | data_release | None | [Categorical] Data release of a given record (with a common data structure, e.g., SDSS-DR16, BOSS-DR16) | False | True | N/A | N/A | N/A |
| C | wavemin | AA | Minimum value of wavelength coverage in Angstroms | False | True | WAVEMIN | spZbest | 1 |
| C | spectype | None | [Categorical] Spectral type of the object (STAR, GALAXY, QSO) | False | True | CLASS | spZbest | 1 |
| C | dec | deg | Declination in degrees | True | True | PLUG_DEC | spZbest | 1 |
| C | telescope | None | [Categorical] Telescope used for the observation | False | True | N/A | N/A | N/A |
| C | redshift_err | None | Uncertainty on the measured redshift, or radial velocity in units of redshift | False | True | Z_ERR | spZbest | 1 |
| C | wavemax | AA | Maximum value of wavelength coverage in Angstroms | False | True | WAVEMAX | spZbest | 1 |
| C | sparcl_id | None | Universally Unique Identifier for spectrum in SPARCL | True | True | N/A | N/A | N/A |
| C | extra_files | None | Additional files read for ingest | False | False | N/A | N/A | N/A |
| C | exptime | second | Exposure time in seconds | False | True | EXPTIME | spPlate | 0 |
| C | file | None | File used for this record | False | False | N/A | N/A | N/A |
| S | model | 1e-17 erg cm-2 s-1 AA-1 | Pipeline best model fit used for classification and redshift | False | True | N/A | spZbest | 2 |
| S | sky | 1e-17 erg cm-2 s-1 AA-1 | Subtracted sky flux | False | True | N/A | spPlate | 6 |
| S | flux | 1e-17 erg cm-2 s-1 AA-1 | Coadded calibrated flux | True | True | N/A | spPlate | 0 |
| S | wave_sigma | pixel | Line-spread function width (sigma of approximating Gaussian) in units of number of pixel | False | True | N/A | spPlate | 4 |
| S | ivar | 1e+34 cm4 s2 AA2 erg-2 | Inverse variance of flux | False | True | N/A | spPlate | 1 |
| S | wavelength | AA | Wavelength in units of Angstroms | True | True | CRVAL1, COEFF1 | spPlate | 0 |
| S | mask | None | and_mask | False | True | N/A | spPlate | 2 |
| C | CORE field |
|---|---|
| S | SPECTRA field |
| A | AUX field |