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Table: ls_dr9.tractor_n
(The bold columns are indexed columns)
| Column Name | Description | Datatype |
|---|---|---|
| allmask_g | Bitwise mask set if the central pixel from all images satisfy each condition in g as cataloged on the DR9 bitmasks page | SMALLINT |
| allmask_r | Bitwise mask set if the central pixel from all images satisfy each condition in r as cataloged on the DR9 bitmasks page | SMALLINT |
| allmask_z | Bitwise mask set if the central pixel from all images satisfy each condition in z as cataloged on the DR9 bitmasks page | SMALLINT |
| anymask_g | Bitwise mask set if the central pixel from any image satisfies each condition in g as cataloged on the DR9 bitmasks page | SMALLINT |
| anymask_r | Bitwise mask set if the central pixel from any image satisfies each condition in r as cataloged on the DR9 bitmasks page | SMALLINT |
| anymask_z | Bitwise mask set if the central pixel from any image satisfies each condition in z as cataloged on the DR9 bitmasks page | SMALLINT |
| blob_nea_g | Blob-masked noise equivalent area in g. | REAL |
| blob_nea_r | Blob-masked noise equivalent area in r. | REAL |
| blob_nea_z | Blob-masked noise equivalent area in z. | REAL |
| brick_primary | True if the object is within the brick boundar | SMALLINT |
| brickid | Brick ID [1,662174] | INTEGER |
| brickname | Name of brick, encoding the brick sky position, eg 1126p222 near RA=112.6, Dec=+22.2 | VARCHAR |
| bx | X position (0-indexed) of coordinates in the brick image stack (i.e. in the e.g. legacysurvey- | REAL |
| by | Y position (0-indexed) of coordinates in the brick image stack (i.e. in the e.g. legacysurvey- | REAL |
| dchisq_1 | Difference in chi^2 between successively more-complex model fits: PSF, REX, DEV, EXP, SER. The difference is versus no source. | REAL |
| dchisq_2 | Difference in chi^2 between successively more-complex model fits: PSF, REX, DEV, EXP, SER. The difference is versus no source. | REAL |
| dchisq_3 | Difference in chi^2 between successively more-complex model fits: PSF, REX, DEV, EXP, SER. The difference is versus no source. | REAL |
| dchisq_4 | Difference in chi^2 between successively more-complex model fits: PSF, REX, DEV, EXP, SER. The difference is versus no source. | REAL |
| dchisq_5 | Difference in chi^2 between successively more-complex model fits: PSF, REX, DEV, EXP, SER. The difference is versus no source. | REAL |
| dec | Declination at equinox J2000 | DOUBLE |
| dec_ivar | Inverse variance of DEC, excluding astrometric calibration errors | REAL |
| dered_flux_g | Dereddened g band flux | REAL |
| dered_flux_r | Dereddened r band flux | REAL |
| dered_flux_w1 | Dereddened w1 band flux | REAL |
| dered_flux_w2 | Dereddened w2 band flux | REAL |
| dered_flux_w3 | Dereddened w3 band flux | REAL |
| dered_flux_w4 | Dereddened w4 band flux | REAL |
| dered_flux_z | Dereddened z band flux | REAL |
| dered_mag_g | Dereddened g-band magnitude | REAL |
| dered_mag_r | Dereddened r-band magnitude | REAL |
| dered_mag_w1 | Dereddened w1-band magnitude | REAL |
| dered_mag_w2 | Dereddened w2-band magnitude | REAL |
| dered_mag_w3 | Dereddened w3-band magnitude | REAL |
| dered_mag_w4 | Dereddened w4-band magnitude | REAL |
| dered_mag_z | Dereddened z-band magnitude | REAL |
| ebv | Galactic extinction E(B-V) reddening from SFD98, used to compute the mw_transmission_ columns | REAL |
| elat | Ecliptic Latitude | DOUBLE |
| elon | Ecliptic Longitude | DOUBLE |
| fiberflux_g | Predicted g-band flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing | REAL |
| fiberflux_r | Predicted g-band flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing | REAL |
| fiberflux_z | Predicted g-band flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing | REAL |
| fibertotflux_g | Predicted g-band flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing | REAL |
| fibertotflux_r | Predicted r-band flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing | REAL |
| fibertotflux_z | Predicted z-band flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing | REAL |
| fitbits | Bitwise mask detailing pecularities of how an object was fit, as cataloged on the DR9 bitmasks page | SMALLINT |
| flux_g | Model flux in g | REAL |
| flux_ivar_g | Inverse variance of flux_g | REAL |
| flux_ivar_r | Inverse variance of flux_r | REAL |
| flux_ivar_w1 | Inverse variance of flux_w1 (AB system) | REAL |
| flux_ivar_w2 | Inverse variance of flux_w2 (AB system) | REAL |
| flux_ivar_w3 | Inverse variance of flux_w3 (AB system) | REAL |
| flux_ivar_w4 | Inverse variance of flux_w4 (AB system) | REAL |
| flux_ivar_z | Inverse variance of flux_z | REAL |
| flux_r | Model flux in r | REAL |
| flux_w1 | WISE model flux in W1 (AB system) | REAL |
| flux_w2 | WISE model flux in W2 (AB system) | REAL |
| flux_w3 | WISE model flux in W3 (AB system) | REAL |
| flux_w4 | WISE model flux in W4 (AB system) | REAL |
| flux_z | Model flux in z | REAL |
| fracflux_g | Profile-weighted fraction of the flux from other sources divided by the total flux in g (typically [0,1]) | REAL |
| fracflux_r | Profile-weighted fraction of the flux from other sources divided by the total flux in r (typically [0,1]) | REAL |
| fracflux_w1 | Profile-weighted fraction of the flux from other sources divided by the total flux in W1 (typically [0,1]) | REAL |
| fracflux_w2 | Profile-weighted fraction of the flux from other sources divided by the total flux in W2 (typically [0,1]) | REAL |
| fracflux_w3 | Profile-weighted fraction of the flux from other sources divided by the total flux in W3 (typically [0,1]) | REAL |
| fracflux_w4 | Profile-weighted fraction of the flux from other sources divided by the total flux in W4 (typically [0,1]) | REAL |
| fracflux_z | Profile-weighted fraction of the flux from other sources divided by the total flux in z (typically [0,1]) | REAL |
| fracin_g | Fraction of a sources flux within the blob in g, near unity for real sources | REAL |
| fracin_r | Fraction of a sources flux within the blob in r, near unity for real sources | REAL |
| fracin_z | Fraction of a sources flux within the blob in z, near unity for real sources | REAL |
| fracmasked_g | Profile-weighted fraction of pixels masked from all observations of this object in g, strictly between [0,1] | REAL |
| fracmasked_r | Profile-weighted fraction of pixels masked from all observations of this object in g, strictly between [0,1] | REAL |
| fracmasked_z | Profile-weighted fraction of pixels masked from all observations of this object in g, strictly between [0,1] | REAL |
| g_r | Computed (g-r) color | REAL |
| gaia_a_g_val | Gaia line-of-sight extinction in the G band | REAL |
| gaia_astrometric_excess_noise | Gaia astrometric excess noise | REAL |
| gaia_astrometric_excess_noise_sig | Gaia astrometric excess noise uncertainty | REAL |
| gaia_astrometric_n_good_obs_al | Gaia number of good astrometric observations along scan direction | SMALLINT |
| gaia_astrometric_n_obs_al | Gaia number of astrometric observations along scan direction | SMALLINT |
| gaia_astrometric_params_solved | Which astrometric parameters were estimated for a Gaia source | SMALLINT |
| gaia_astrometric_sigma5d_max | Gaia longest semi-major axis of the 5-d error ellipsoid | REAL |
| gaia_astrometric_weight_al | Gaia astrometric weight along scan direction | REAL |
| gaia_duplicated_source | Gaia duplicated source flag | SMALLINT |
| gaia_e_bp_min_rp_val | Gaia line-of-sight reddening E(BP-RP) | REAL |
| gaia_phot_bp_mean_flux_over_error | Gaia BP signal-to-noise | REAL |
| gaia_phot_bp_mean_mag | Gaia BP mag | REAL |
| gaia_phot_bp_n_obs | Gaia BP number of observations | SMALLINT |
| gaia_phot_bp_rp_excess_factor | Gaia BP/RP excess factor | REAL |
| gaia_phot_g_mean_flux_over_error | Gaia G band signal-to-noise | REAL |
| gaia_phot_g_mean_mag | Gaia G band mag | REAL |
| gaia_phot_g_n_obs | Gaia g band number of observations | SMALLINT |
| gaia_phot_rp_mean_flux_over_error | Gaia RP band signal-to-noise | REAL |
| gaia_phot_rp_mean_mag | Gaia RP mag | REAL |
| gaia_phot_rp_n_obs | Gaia RP band number of observations | SMALLINT |
| gaia_phot_variable_flag | Gaia photometric variable flag | SMALLINT |
| galdepth_g | As for psfdepth_g but for a galaxy (0.45 exp, round) detection sensitivity | REAL |
| galdepth_r | As for psfdepth_r but for a galaxy (0.45 exp, round) detection sensitivity | REAL |
| galdepth_z | As for psfdepth_z but for a galaxy (0.45 exp, round) detection sensitivity | REAL |
| glat | Galactic Latitude | DOUBLE |
| glon | Galactic Longitude | DOUBLE |
| htm9 | HTM index (order 9 => ~10 arcmin size) | INTEGER |
| ls_id | Unique LS object ID | BIGINT |
| mag_g | Converted g magnitude | REAL |
| mag_r | Converted r magnitude | REAL |
| mag_w1 | Converted W1 magnitude | REAL |
| mag_w2 | Converted W2 magnitude | REAL |
| mag_w3 | Converted W3 magnitude | REAL |
| mag_w4 | Converted W4 magnitude | REAL |
| mag_z | Converted z magnitude | REAL |
| maskbits | Bitwise mask indicating that an object touches a pixel in the coadd/*/*/*maskbits* maps, as cataloged on the DR9 bitmasks page | SMALLINT |
| mjd_max | Maximum Modified Julian Date of observations used to construct the model of this object | DOUBLE |
| mjd_min | Minimum Modified Julian Date of observations used to construct the model of this object | DOUBLE |
| mw_transmission_g | Galactic transmission in g filter in linear units [0, 1] | REAL |
| mw_transmission_r | Galactic transmission in r filter in linear units [0, 1] | REAL |
| mw_transmission_w1 | Galactic transmission in w1 filter in linear units [0, 1] | REAL |
| mw_transmission_w2 | Galactic transmission in w2 filter in linear units [0, 1] | REAL |
| mw_transmission_w3 | Galactic transmission in w3 filter in linear units [0, 1] | REAL |
| mw_transmission_w4 | Galactic transmission in w4 filter in linear units [0, 1] | REAL |
| mw_transmission_z | Galactic transmission in z filter in linear units [0, 1] | REAL |
| nea_g | Noise equivalent area in g | REAL |
| nea_r | Noise equivalent area in r | REAL |
| nea_z | Noise equivalent area in z | REAL |
| nest4096 | HEALPIX index (Nsides 4096, Nest scheme => ~52 arcsec size | INTEGER |
| nobs_g | Number of images that contribute to the central pixel in g: filter for this object (not profile-weighted) | SMALLINT |
| nobs_r | Number of images that contribute to the central pixel in r: filter for this object (not profile-weighted) | SMALLINT |
| nobs_w1 | Number of images that contribute to the central pixel in W1: filter for this object (not profile-weighted) | SMALLINT |
| nobs_w2 | Number of images that contribute to the central pixel in W2: filter for this object (not profile-weighted) | SMALLINT |
| nobs_w3 | Number of images that contribute to the central pixel in W3: filter for this object (not profile-weighted) | SMALLINT |
| nobs_w4 | Number of images that contribute to the central pixel in W4: filter for this object (not profile-weighted) | SMALLINT |
| nobs_z | Number of images that contribute to the central pixel in z: filter for this object (not profile-weighted) | SMALLINT |
| objid | Catalog object number within this brick; a unique identifier hash is release,brickid,objid; objid spans [0,N-1] and is contiguously enumerated within each brick | INTEGER |
| parallax | Reference catalog parallax | REAL |
| parallax_ivar | Reference catalog inverse-variance on parallax | REAL |
| pmdec | Reference catalog proper motion in the Dec direction | REAL |
| pmdec_ivar | Reference catalog inverse-variance on pmdec | REAL |
| pmra | Reference catalog proper motion in the RA direction | REAL |
| pmra_ivar | Reference catalog inverse-variance on pmra | REAL |
| psfdepth_g | For a 5 sigma point source detection limit in g, 5/(sqrt psfdepth_g) gives flux in nanomaggies and (-2.5[log10(5/(sqrt psfdepth_g))-9]) gives corresponding AB magnitude | REAL |
| psfdepth_r | For a 5 sigma point source detection limit in r, 5/(sqrt psfdepth_r) gives flux in nanomaggies and (-2.5[log10(5/(sqrt psfdepth_r))-9]) gives corresponding AB magnitude | REAL |
| psfdepth_w1 | As for psfdepth_g (and also on the AB system) but for WISE W1 | REAL |
| psfdepth_w2 | As for psfdepth_g (and also on the AB system) but for WISE W2 | REAL |
| psfdepth_w3 | As for psfdepth_g (and also on the AB system) but for WISE W3 | REAL |
| psfdepth_w4 | As for psfdepth_g (and also on the AB system) but for WISE W4 | REAL |
| psfdepth_z | For a 5 sigma point source detection limit in z, 5/(sqrt psfdepth_z) gives flux in nanomaggies and (-2.5[log10(5/(sqrt psfdepth_z))-9]) gives corresponding AB magnitude | REAL |
| psfsize_g | Weighted average PSF FWHM in the g band | REAL |
| psfsize_r | Weighted average PSF FWHM in the r band | REAL |
| psfsize_z | Weighted average PSF FWHM in the z band | REAL |
| r_z | Computed (r-z) color | REAL |
| ra | Right ascension at equinox J2000 | DOUBLE |
| ra_ivar | Inverse variance of RA (no cosine term!), excluding astrometric calibration errors | REAL |
| random_id | Random ID in the range 0.0 => 100.0 | REAL |
| rchisq_g | Profile-weighted chi^2 of model fit normalized by the number of pixels in g | REAL |
| rchisq_r | Profile-weighted chi^2 of model fit normalized by the number of pixels in r | REAL |
| rchisq_w1 | Profile-weighted chi^2 of model fit normalized by the number of pixels in W1 | REAL |
| rchisq_w2 | Profile-weighted chi^2 of model fit normalized by the number of pixels in W2 | REAL |
| rchisq_w3 | Profile-weighted chi^2 of model fit normalized by the number of pixels in W3 | REAL |
| rchisq_w4 | Profile-weighted chi^2 of model fit normalized by the number of pixels in W4 | REAL |
| rchisq_z | Profile-weighted chi^2 of model fit normalized by the number of pixels in z | REAL |
| ref_cat | Reference catalog source for this star: T2 for Tycho-2, G2 for Gaia DR2, L3 for the SGA, empty otherwise | VARCHAR |
| ref_epoch | Reference catalog reference epoch (eg, 2015.5 for Gaia DR2) | REAL |
| ref_id | Reference catalog identifier for this star; Tyc1*1,000,000+Tyc2*10+Tyc3 for Tycho2; sourceid for Gaia DR2 and SGA | BIGINT |
| release | Integer denoting the camera and filter set used, which will be unique for a given processing run of the data, as documented at https://www.legacysurvey.org/dr9/catalogs/ | SMALLINT |
| ring256 | HEALPIX index (Nsides 256, Ring scheme => ~14 arcmin size) | INTEGER |
| sersic | Power-law index for the Sersic profile model (type=SER) | REAL |
| sersic_ivar | Inverse variance of sersic | REAL |
| shape_e1 | Ellipticity component 1 of galaxy model for galaxy type type | REAL |
| shape_e1_ivar | Inverse variance of shape_e1 | REAL |
| shape_e2 | Ellipticity component 2 of galaxy model for galaxy type type | REAL |
| shape_e2_ivar | Inverse variance of shape_e2 | REAL |
| shape_r | Half-light radius of galaxy model for galaxy type type (>0) | REAL |
| shape_r_ivar | Inverse variance of shape_r | REAL |
| snr_g | Signal-to-Noise ratio in g | REAL |
| snr_r | Signal-to-Noise ratio in r | REAL |
| snr_w1 | Signal-to-Noise ratio in W1 | REAL |
| snr_w2 | Signal-to-Noise ratio in W2 | REAL |
| snr_w3 | Signal-to-Noise ratio in W3 | REAL |
| snr_w4 | Signal-to-Noise ratio in W4 | REAL |
| snr_z | Signal-to-Noise ratio in z | REAL |
| type | Morphological model: PSF=stellar, REX=round exponential galaxy, DEV=deVauc, EXP=exponential, SER=Sersic, DUP=Gaia source fit by different model. | VARCHAR |
| w1_w2 | Computed (w1-w2) color | REAL |
| w2_w3 | Computed (w2-w3) color | REAL |
| w3_w4 | Computed (w3-w4) color | REAL |
| wise_coadd_id | unWISE coadd brick name (corresponding to the, e.g., legacysurvey- | VARCHAR |
| wise_x | X position of coordinates in the brick image stack that corresponds to wise_coadd_id (see the DR9 updates page for transformations between wise_x and bx) | REAL |
| wise_y | Y position of coordinates in the brick image stack that corresponds to wise_coadd_id (see the DR9 updates page for transformations between wise_y and by) | REAL |
| wisemask_w1 | W1 bitmask as cataloged on the DR9 bitmasks page | SMALLINT |
| wisemask_w2 | W2 bitmask as cataloged on the DR9 bitmasks page | SMALLINT |
| z_w1 | Computed (z-w1) color | REAL |
