=============== fba-TILEID.fits =============== :Summary: This type of file is intended to be an "almost complete", but still intermediate, version of the final :doc:`fiberassign files <../../../../../DESI_TARGET/fiberassign/tiles/TILES_VERSION/TILEXX/fiberassign-TILEID>`. :Naming Convention: ``fba-{TILEID}.fits``, where ``{TILEID}`` is the zero-padded, 6-digit TILED. :Regex: ``fba-[0-9]{6}\.fits`` :File Type: FITS, 9 MB Contents ======== ====== =========== ======== =================== Number EXTNAME Type Contents ====== =========== ======== =================== HDU0_ PRIMARY IMAGE Empty HDU. HDU1_ FASSIGN BINTABLE Short version of FIBERASSIGN HDU HDU2_ FTARGETS BINTABLE Short version of TARGETS HDU HDU3_ FAVAIL BINTABLE Equivalent to POTENTIAL_ASSIGNMENTS HDU4_ GFA_TARGETS BINTABLE Selected star for the ETC / GUIDE / FOCUS ====== =========== ======== =================== FITS Header Units ================= HDU0 ---- EXTNAME = PRIMARY This HDU contains header keywords only. Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table .. rst-class:: keywords ============= ========================= ===== ======= KEY Example Value Type Comment ============= ========================= ===== ======= TILEID 1774 int TILERA 222.786 float TILEDEC 41.722 float FIELDROT -0.113900362856195 float FA_PLAN 2022-07-01T00:00:00.000 str FA_HA 10.15 float FA_RUN 2021-05-18T21:57:00+00:00 str FA_M_GFA [1]_ 0.4 float FA_M_PET [1]_ 0.4 float FA_M_POS [1]_ 0.05 float REQRA 222.786 float REQDEC 41.722 float FIELDNUM 0 int FA_VER 4.0.0 str FA_SURV main str ============= ========================= ===== ======= .. [1] Optional Empty HDU. HDU1 ---- EXTNAME = FASSIGN Short version of FIBERASSIGN HDU. Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table .. rst-class:: keywords ============= ========================= ===== ======================= KEY Example Value Type Comment ============= ========================= ===== ======================= NAXIS1 66 int width of table in bytes NAXIS2 5020 int number of rows in table TILEID 1774 int TILERA 222.786 float TILEDEC 41.722 float FIELDROT -0.113900362856195 float FA_PLAN 2022-07-01T00:00:00.000 str FA_HA 10.15 float FA_RUN 2021-05-18T21:57:00+00:00 str FA_M_GFA [1]_ 0.4 float FA_M_PET [1]_ 0.4 float FA_M_POS [1]_ 0.05 float REQRA 222.786 float REQDEC 41.722 float FIELDNUM 0 int FA_VER 4.0.0 str FA_SURV main str ============= ========================= ===== ======================= Required Data Table Columns ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. rst-class:: columns ============== ======= ======== ======================================================================== Name Type Units Description ============== ======= ======== ======================================================================== FIBER int32 Fiber ID on the CCDs [0-4999] TARGETID int64 Unique DESI target ID LOCATION int32 Location on the focal plane PETAL_LOC*1000 + DEVICE_LOC FIBERSTATUS int32 Fiber status mask. 0=good LAMBDA_REF float32 Angstrom Requested wavelength at which targets should be centered on fibers PETAL_LOC int16 Petal location [0-9] DEVICE_LOC int32 Device location on focal plane [0-523] DEVICE_TYPE char[3] Device type TARGET_RA float64 deg Barycentric right ascension in ICRS TARGET_DEC float64 deg Barycentric declination in ICRS 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) FIBERASSIGN_X float32 mm Fiberassign expected CS5 X location on focal plane FIBERASSIGN_Y float32 mm Fiberassign expected CS5 Y location on focal plane PLATE_RA [1]_ float64 deg Barycentric Right Ascension in ICRS to be used by PlateMaker PLATE_DEC [1]_ float64 deg Barycentric Declination in ICRS to be used by PlateMaker ============== ======= ======== ======================================================================== HDU2 ---- EXTNAME = FTARGETS Short version of TARGETS. Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table .. rst-class:: keywords ============= ========================= ===== ======================= KEY Example Value Type Comment ============= ========================= ===== ======================= NAXIS1 49 int width of table in bytes NAXIS2 146897 int number of rows in table TILEID 1774 int TILERA 222.786 float TILEDEC 41.722 float FIELDROT -0.113900362856195 float FA_PLAN 2022-07-01T00:00:00.000 str FA_HA 10.15 float FA_RUN 2021-05-18T21:57:00+00:00 str FA_M_GFA [1]_ 0.4 float FA_M_PET [1]_ 0.4 float FA_M_POS [1]_ 0.05 float REQRA 222.786 float REQDEC 41.722 float FIELDNUM 0 int FA_VER 4.0.0 str FA_SURV main str ============= ========================= ===== ======================= Required Data Table Columns ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. rst-class:: columns ============== ======= ===== ======================================================================== Name Type Units Description ============== ======= ===== ======================================================================== TARGETID int64 Unique DESI target ID TARGET_RA float64 deg Barycentric right ascension in ICRS TARGET_DEC float64 deg Barycentric declination in ICRS 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) PRIORITY int32 Target current priority SUBPRIORITY float64 Random subpriority [0-1) to break assignment ties OBSCONDITIONS int32 Bitmask of allowed observing conditions PLATE_RA [1]_ float64 deg Barycentric Right Ascension in ICRS to be used by PlateMaker PLATE_DEC [1]_ float64 deg Barycentric Declination in ICRS to be used by PlateMaker ============== ======= ===== ======================================================================== HDU3 ---- EXTNAME = FAVAIL Equivalent to POTENTIAL_ASSIGNMENTS HDU. Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table .. rst-class:: keywords ============= ========================= ===== ======================= KEY Example Value Type Comment ============= ========================= ===== ======================= NAXIS1 16 int width of table in bytes NAXIS2 163517 int number of rows in table TILEID 1774 int TILERA 222.786 float TILEDEC 41.722 float FIELDROT -0.113900362856195 float FA_PLAN 2022-07-01T00:00:00.000 str FA_HA 10.15 float FA_RUN 2021-05-18T21:57:00+00:00 str FA_M_GFA [1]_ 0.4 float FA_M_PET [1]_ 0.4 float FA_M_POS [1]_ 0.05 float REQRA 222.786 float REQDEC 41.722 float FIELDNUM 0 int FA_VER 4.0.0 str FA_SURV main str ============= ========================= ===== ======================= Required Data Table Columns ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. rst-class:: columns ======== ===== ===== ======================================================= Name Type Units Description ======== ===== ===== ======================================================= LOCATION int32 Location on the focal plane PETAL_LOC*1000 + DEVICE_LOC FIBER int32 Fiber ID on the CCDs [0-4999] TARGETID int64 Unique DESI target ID ======== ===== ===== ======================================================= HDU4 ---- EXTNAME = GFA_TARGETS GFA stars to be used by the ETC / GUIDE / FOCUS Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table .. rst-class:: keywords ====== ============= ==== ======================= KEY Example Value Type Comment ====== ============= ==== ======================= NAXIS1 168 int width of table in bytes NAXIS2 820 int number of rows in table ====== ============= ==== ======================= Required Data Table Columns ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. rst-class:: columns ================================= ======= ============ ===================================================================================================== Name Type Units Description ================================= ======= ============ ===================================================================================================== RELEASE int32 Imaging surveys release ID TARGETID int64 Unique DESI target ID BRICKID int32 Brick ID from tractor input BRICK_OBJID int32 Imaging Surveys OBJID on that brick TARGET_RA float64 deg Barycentric right ascension in ICRS TARGET_DEC float64 deg Barycentric declination in ICRS TARGET_RA_IVAR float32 label for field 7 TARGET_DEC_IVAR float32 label for field 8 MORPHTYPE char[4] Imaging Surveys morphological type from Tractor MASKBITS int16 Bitwise mask from the imaging indicating potential issue or blending 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) 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 REF_EPOCH float32 yr Reference epoch for Gaia/Tycho astrometry. Typically 2015.5 for Gaia PARALLAX float32 mas Reference catalog parallax PARALLAX_IVAR float32 mas^-2 Inverse variance of PARALLAX PMRA float32 mas yr^-1 proper motion in the +RA direction (already including cos(dec)) PMDEC float32 mas yr^-1 Proper motion in the +Dec direction PMRA_IVAR float32 yr^2 mas^-2 Inverse variance of PMRA PMDEC_IVAR float32 yr^2 mas^-2 Inverse variance of PMDEC GAIA_PHOT_G_MEAN_MAG float32 mag Gaia G band magnitude GAIA_PHOT_G_MEAN_FLUX_OVER_ERROR float32 Gaia G band signal-to-noise GAIA_PHOT_BP_MEAN_MAG float32 mag Gaia BP band magnitude GAIA_PHOT_BP_MEAN_FLUX_OVER_ERROR float32 Gaia BP band signal-to-noise GAIA_PHOT_RP_MEAN_MAG float32 mag Gaia RP band magnitude GAIA_PHOT_RP_MEAN_FLUX_OVER_ERROR float32 Gaia RP band signal-to-noise GAIA_ASTROMETRIC_EXCESS_NOISE float32 Gaia astrometric excess noise 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 GAIA_PHOT_G_N_OBS [1]_ int32 Gaia G band number of observations HPXPIXEL int64 HEALPixel containing this location at NSIDE=64 in the NESTED scheme GFA_LOC int16 label for field 36 ETC_FLAG int16 label for field 37 GUIDE_FLAG int16 label for field 38 FOCUS_FLAG int16 label for field 39 ================================= ======= ============ ===================================================================================================== Notes and Examples ================== This type of file contains only what is strictly needed or generated by fiber assignment itself, while the final :doc:`fiberassign-TILEID.fits.gz files <../../../../../DESI_TARGET/fiberassign/tiles/TILES_VERSION/TILEXX/fiberassign-TILEID>` also have merged in targeting information, and some bookkeeping changes such as splitting the 20 sky monitor fibers separate from the 5000 science fibers, and renaming/reordering HDUs.