================ TILEID-scnd.fits ================ :Summary: This file contains the secondary targets covered by the tile disk-footprint. :Naming Convention: ``{TILEID}-scnd.fits``, where ``{TILEID}`` is the zero-padded, 6-digit TILED. :Regex: ``[0-9]{6}-scnd\.fits`` :File Type: FITS, 1 MB Contents ======== ====== ======= ======== ===================================================== Number EXTNAME Type Contents ====== ======= ======== ===================================================== HDU0_ IMAGE Empty HDU HDU1_ TARGETS BINTABLE Secondary targets covered by the tile disk-footprint. ====== ======= ======== ===================================================== FITS Header Units ================= HDU0 ---- This HDU has no non-standard required keywords. Empty HDU. HDU1 ---- EXTNAME = TARGETS Secondary 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 275 int width of table in bytes NAXIS2 4751 int number of rows in table SURVEY main str RESOLVE T bool MASKBITS T bool BACKUP F bool NOSEC F bool DR None Unknown ======== ============= ======= ======================= Required Data Table Columns ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. rst-class:: columns ===================== ======== ========= ======================================================================================================= Name Type Units Description ===================== ======== ========= ======================================================================================================= 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) 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 TARGETID int64 Unique DESI target ID RA float64 deg Barycentric Right Ascension in ICRS DEC float64 deg Barycentric declination in ICRS PMRA float32 mas / yr proper motion in the +RA direction (already including cos(dec)) PMDEC float32 mas / yr Proper motion in the +Dec direction REF_EPOCH float32 yr Reference epoch for Gaia/Tycho astrometry. Typically 2015.5 for Gaia PARALLAX float32 mas Reference catalog parallax DESI_TARGET int64 DESI (dark time program) target selection bitmask SCND_TARGET int64 Target selection bitmask for secondary programs 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 BGS_TARGET int64 BGS (Bright Galaxy Survey) target selection bitmask MWS_TARGET int64 Milky Way Survey targeting bits 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 ===================== ======== ========= ======================================================================================================= 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``.