================ TILEID-targ.fits ================ :Summary: This file contains the primary science targets covered by the tile disk-footprint. :Naming Convention: ``{TILEID}-targ.fits``, where ``{TILEID}`` is the zero-padded, 6-digit TILED. :Regex: ``[0-9]{6}-targ\.fits`` :File Type: FITS, 11 MB Contents ======== ====== ======= ======== =========================================================== Number EXTNAME Type Contents ====== ======= ======== =========================================================== HDU0_ IMAGE Empty HDU HDU1_ TARGETS BINTABLE Primary science targets covered by the tile disk-footprint. ====== ======= ======== =========================================================== FITS Header Units ================= HDU0 ---- This HDU has no non-standard required keywords. Empty HDU. HDU1 ---- EXTNAME = TARGETS Primary science targets covered by the tile disk-footprint: those are read from the MTL ledgers and desitarget catalogs and provided as input to fiberassign. Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table .. rst-class:: keywords ========== ============= ======= ======================= KEY Example Value Type Comment ========== ============= ======= ======================= NAXIS1 382 int width of table in bytes NAXIS2 30866 int number of rows in table SURVEY main str RESOLVE T bool MASKBITS T bool BACKUP F bool NOSEC [1]_ F bool DR None Unknown ========== ============= ======= ======================= Required Data Table Columns ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. rst-class:: columns ===================== ======== ============ ======================================================================================================================================= Name Type Units Description ===================== ======== ============ ======================================================================================================================================= RELEASE int16 Imaging surveys release ID BRICKID int32 Brick ID from tractor input BRICKNAME char[8] Brick name from tractor input BRICK_OBJID int32 Imaging Surveys OBJID on that brick MORPHTYPE char[4] Imaging Surveys morphological type from Tractor EBV float32 mag Galactic extinction E(B-V) reddening from SFD98 FLUX_G float32 nanomaggy Flux in the Legacy Survey g-band (AB) FLUX_R float32 nanomaggy Flux in the Legacy Survey r-band (AB) FLUX_Z float32 nanomaggy Flux in the Legacy Survey z-band (AB) 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_Z float32 nanomaggy^-2 Inverse variance of FLUX_Z (AB) FLUX_W1 float32 nanomaggy WISE flux in W1 (AB) FLUX_W2 float32 nanomaggy WISE flux in W2 (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) FIBERFLUX_G float32 nanomaggy Predicted g-band flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing FIBERFLUX_R float32 nanomaggy Predicted r-band flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing FIBERFLUX_Z float32 nanomaggy Predicted z-band flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing FIBERTOTFLUX_G float32 nanomaggy Predicted g-band 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 r-band 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 z-band flux within a fiber of diameter 1.5 arcsec from all sources at this location in 1 arcsec Gaussian seeing MASKBITS int16 Bitwise mask from the imaging indicating potential issue or blending SHAPE_R float32 arcsec Half-light radius of galaxy model (greater than 0) SHAPE_E1 float32 Ellipticity component 1 of galaxy model for galaxy type MORPHTYPE SHAPE_E2 float32 Ellipticity component 2 of galaxy model for galaxy type MORPHTYPE SERSIC float32 Power-law index for the Sersic profile model (MORPHTYPE='SER') REF_ID int64 Tyc1*1,000,000+Tyc2*10+Tyc3 for Tycho-2; ``sourceid`` for Gaia DR2 REF_CAT char[2] Reference catalog source for star: 'T2' for Tycho-2, 'G2' for Gaia DR2, 'L2' for the SGA, empty otherwise GAIA_PHOT_G_MEAN_MAG float32 mag Gaia G band magnitude GAIA_PHOT_BP_MEAN_MAG float32 mag Gaia BP band magnitude GAIA_PHOT_RP_MEAN_MAG float32 mag Gaia RP band magnitude PHOTSYS char[1] 'N' for the MzLS/BASS photometric system, 'S' for DECaLS TARGETID int64 Unique DESI target ID RA float64 deg Barycentric Right Ascension in ICRS DEC float64 deg Barycentric declination in ICRS REF_EPOCH float32 yr Reference epoch for Gaia/Tycho astrometry. Typically 2015.5 for Gaia PARALLAX float32 mas Reference catalog parallax PMRA float32 mas / yr proper motion in the +RA direction (already including cos(dec)) PMDEC float32 mas / yr Proper motion in the +Dec direction DESI_TARGET int64 DESI (dark time program) target selection bitmask BGS_TARGET int64 BGS (Bright Galaxy Survey) target selection bitmask MWS_TARGET int64 Milky Way Survey targeting bits SUBPRIORITY float64 Random subpriority [0-1) to break assignment ties OBSCONDITIONS int32 Bitmask of allowed observing conditions PRIORITY_INIT int64 Target initial priority from target selection bitmasks and OBSCONDITIONS NUMOBS_INIT int64 Initial number of observations for target calculated across target selection bitmasks and OBSCONDITIONS SCND_TARGET int64 Target selection bitmask for secondary programs NUMOBS_MORE int64 Number of additional observations needed NUMOBS int64 Number of spectroscopic observations (on this specific, single tile) Z float64 Redshift measured by Redrock ZWARN int64 Redshift warning bitmask from Redrock ZTILEID int32 ID of tile that most recently updated target's state Z_QN float64 Redshift measured by QuasarNET using line with highest confidence IS_QSO_QN int16 Spectroscopic classification from QuasarNET (1 for a quasar) DELTACHI2 float64 chi2 difference between first- and second-best redrock template fits TARGET_STATE char[30] Combination of target class and its current observational state TIMESTAMP char[25] s UTC/ISO time at which the target state was updated VERSION char[14] Tag of desitarget used to create the target catalog PRIORITY int64 Target current priority PLATE_RA float64 deg Barycentric Right Ascension in ICRS to be used by PlateMaker PLATE_DEC float64 deg Barycentric Declination in ICRS to be used by PlateMaker PLATE_REF_EPOCH float32 yr Copy of REF_EPOCH to be used by PlateMaker ===================== ======== ============ ======================================================================================================================================= .. [1] Optional Notes and Examples ================== For the SURVEY=cmx m33 tile (TILEID=80615) tile and all the SURVEY=sv1 tiles (except TILEID=80971-80976, the dc3r2 ones), proper-motion correction was applied at the :doc:`fiberassign ` design step; thus the following columns can have different values than in the :doc:`desitarget products `: ``TARGET_RA``, ``TARGET_DEC``, ``REF_EPOCH``, ``PLATE_RA``, ``PLATE_DEC``, and ``PLATE_REF_EPOCH``. Some units in this file do not conform to the FITS standard: * nanomaggy^-2 is incorrectly recorded as 1/nanomaggy^2 Such issues can typically be fixed by parsing the unit through astropy after reading in a Table, e.g.: .. code-block:: python import astropy.units as u from astropy.table import Table objs = Table.read(filename, 1) u.Unit(str(objs["FLUX_IVAR_Z"].unit))