APOGEE Bitmasks
APOGEE_ASPCAPFLAG : ASPCAP star level bitmask
This bitmask is used to provide information and indicate possible issues associated with the ASPCAP fits. The flags refer to issues in the spectra impacting the fit (inherited from
STARFLAG), issues incurred during the fitting process, and issues incurred when evaluating the parameters. For flags associated with a stellar parameter or chemical abundance measurement, more detailed information is available in the PARAMFLAG or ELEMFLAG bitmask for that measurement.
| Bit Name | Binary Digit | Description |
|---|---|---|
| TEFF_WARN | 0 | WARNING on effective temperature (see PARAMFLAG[0] for details) |
| LOGG_WARN | 1 | WARNING on log g (see PARAMFLAG[1] for details) |
| VMICRO_WARN | 2 | WARNING on vmicro (see PARAMFLAG[2] for details) |
| M_H_WARN | 3 | WARNING on metals (see PARAMFLAG[3] for details) |
| ALPHA_M_WARN | 4 | WARNING on [alpha/M] (see PARAMFLAG[4] for details) |
| C_M_WARN | 5 | WARNING on [C/M] (see PARAMFLAG[5] for details) |
| N_M_WARN | 6 | WARNING on [N/M] (see PARAMFLAG[6] for details) |
| STAR_WARN | 7 | WARNING overall for star: set if any of TEFF, LOGG, CHI2, COLORTE, ROTATION, SN warn are set |
| CHI2_WARN | 8 | higher than typical chi^2 (> 30*(SNR/100)**2) |
| COLORTE_WARN | 9 | effective temperature more than 500K from photometric temperature for dereddened color (WARN) |
| ROTATION_WARN | 10 | Spectrum has broad lines, with possible bad effects: FWHM of cross-correlation of spectrum with best RV template relative to auto-correltion of template > 1.5 (WARN) |
| SN_WARN | 11 | S/N<70 (WARN) |
| SPEC_HOLE_WARN | 12 | Grid point within 2 grid steps of hole-filled synthesis |
| ATMOS_HOLE_WARN | 13 | Grid point within 2 grid steps of hole-filled atmosphere |
| VSINI_WARN | 14 | |
| TEFF_BAD | 16 | potentially BAD effective temperature (see PARAMFLAG[0] for details) |
| LOGG_BAD | 17 | potentially BAD log g (see PARAMFLAG[1] for details) |
| VMICRO_BAD | 18 | potentially BAD vmicro (see PARAMFLAG[2] for details) |
| M_H_BAD | 19 | potentially BAD metals (see PARAMFLAG[3] for details) |
| ALPHA_M_BAD | 20 | potentially BAD [alpha/M] (see PARAMFLAG[4] for details) |
| C_M_BAD | 21 | potentially BAD [C/M] (see PARAMFLAG[5] for details) |
| N_M_BAD | 22 | potentially BAD [N/M] (see PARAMFLAG[6] for details) |
| STAR_BAD | 23 | BAD overall for star: set if any of TEFF, LOGG, CHI2, COLORTE, ROTATION, SN error are set, or any GRIDEDGE_BAD |
| CHI2_BAD | 24 | significantly higher than typical chi^2 (> 50*(SNR/100)**2) |
| COLORTE_BAD | 25 | effective temperature more than 1000K from photometric temperature for dereddened color |
| ROTATION_BAD | 26 | Spectrum has broad lines, with possible bad effects: FWHM of cross-correlation of spectrum with best RV template relative to auto-correltion of template > 2 (BAD) |
| SN_BAD | 27 | S/N<50 |
| SPEC_HOLE_BAD | 28 | Grid point within 1 grid steps of hole-filled synthesis |
| ATMOS_HOLE_BAD | 29 | Grid point within 1 grid steps of hole-filled atmosphere |
| VSINI_BAD | 30 | |
| NO_ASPCAP_RESULT | 31 | |
| MISSING_APSTAR | 32 | Missing apStar file |
| NO_GRID | 33 | Not processed by any ASPCAP grid |
| BAD_FRAC_LOWSNR | 34 | Fraction low SNR pixels > 0.5 |
| BAD_FRAC_BADPIX | 35 | Fraction bad pixels > 0.5 or 0.33 in any chip |
| FERRE_FAIL | 36 | FERRE failure (bad input?) |
| PROBLEM_TARGET | 40 | Target probably not suitable for standard ASPCAP analysis: extended, embedded, galaxy, etc |
| MULTIPLE_SUSPECT | 41 | Likely composite spectrum, possibly not suitable for standard ASPCAP analysis |
APOGEE_PARAMFLAG, APOGEE_ELEMFLAG : ASPCAP bitmask for individual parameters/abundances
These bitmasks are used to provide information indicate possible issues associated with individual measurements from ASPCAP fits. This bit provides more context for some of the bits in
ASPCAPFLAG. A PARAMFLAG or ELEMFLAG is produced for each of the stellar parameters and chemical abundances measured in DR17, and each of the bitmasks has the same format.
| Bit Name | Binary Digit | Description |
|---|---|---|
| GRIDEDGE_BAD | 0 | Parameter within 1/8 grid spacing of grid edge : true value may be off grid |
| CALRANGE_BAD | 1 | Parameter outside valid range of calibration determination |
| OTHER_BAD | 2 | Other error condition |
| FERRE_FAIL | 3 | Failed solution in FERRE |
| PARAM_MISMATCH_BAD | 4 | Elemental abundance from window differs significantly from parameter abundance |
| FERRE_ERR_USED | 5 | FERRE uncertainty used (larger than parametric uncertainty) |
| TEFF_CUT | 6 | Star in region of parameter space where abundances do not appear valid for this element |
| GRIDEDGE_WARN | 8 | Parameter within 1 grid spacing of grid edge (not necessarily bad) |
| CALRANGE_WARN | 9 | Parameter in possibly unreliable range of calibration determination |
| OTHER_WARN | 10 | Other warning condition |
| FERRE_WARN | 11 | FERRE warning (not implemented?) |
| PARAM_MISMATCH_WARN | 12 | Elemental abundance from window differs from parameter abundance |
| OPTICAL_WARN | 13 | Comparison with optical abundances suggests problem |
| ERR_WARN | 14 | Large expected uncertainty or upper limit based on location in parameter space (Teff, [M/H], S/N) |
| FAINT_WARN | 15 | Warning based on faint star/RV combination |
| PARAM_FIXED | 16 | Parameter set at fixed value, not fit |
| RV_WARN | 17 | RV puts important line off of chip |
| SPEC_RC | 24 | Spectroscopically identified RC star |
| SPEC_RGB | 25 | Spectroscopically identified RGB star |
| LOGG_CAL_MS | 26 | DR16: use MS gravity calibration |
| LOGG_CAL_RGB_MS | 27 | DR16: use RBG/MS transition gravity calibration |
APOGEE_STARFLAG, APOGEE_ANDFLAG : APOGEE star level bitmask
This bitmask is used to provide information and identify issues associated with spectral processing, radial velocity measurement, and spectral combination. At the visit level, it conveys information relevant to a specific spectrum. It is also used for combined spectra in both STARFLAG and ANDFLAG, where the former is a bitwise OR of the visit STARFLAG for all of the visits, and the latter is a bitwise AND of the visit STARFLAG for all of the visits. The bitmask
RV_FLAG provides more details relevant to the RV determination.
| Bit Name | Binary Digit | Description |
|---|---|---|
| BAD_PIXELS | 0 | Spectrum has many bad pixels (>20%): BAD |
| COMMISSIONING | 1 | Commissioning data (MJD<55761), non-standard configuration, poor LSF: WARN |
| BRIGHT_NEIGHBOR | 2 | Star has neighbor more than 10 times brighter: WARN |
| VERY_BRIGHT_NEIGHBOR | 3 | Star has neighbor more than 100 times brighter: possibly BAD |
| LOW_SNR | 4 | Spectrum has low S/N (S/N<5) |
| PERSIST_HIGH | 9 | Spectrum has significant number (>20%) of pixels in high persistence region: WARN |
| PERSIST_MED | 10 | Spectrum has significant number (>20%) of pixels in medium persistence region: WARN |
| PERSIST_LOW | 11 | Spectrum has significant number (>20%) of pixels in low persistence region: WARN |
| PERSIST_JUMP_POS | 12 | Spectrum show obvious positive jump in blue chip: WARN |
| PERSIST_JUMP_NEG | 13 | Spectrum show obvious negative jump in blue chip: WARN |
| SUSPECT_RV_COMBINATION | 16 | RVs from synthetic template differ significantly (~2 km/s) from those from combined template: WARN |
| SUSPECT_BROAD_LINES | 17 | Autocorrelation peak width large |
| BAD_RV_COMBINATION | 18 | RVs from synthetic template differ very significatly (~10 km/s) from those from combined template: potentially BAD |
| RV_REJECT | 19 | Rejected visit because cross-correlation RV differs significantly from least squares RV |
| RV_SUSPECT | 20 | Suspect visit (but used!) because cross-correlation RV differs slightly from least squares RV |
| MULTIPLE_SUSPECT | 21 | Suspect multiple components from Gaussian decomposition of cross-correlation |
| RV_FAIL | 22 | RV failure |
| SUSPECT_ROTATION | 23 | Suspect rotation: cross-correlation peak with template significantly broader than autocorretion of template |
| MTPFLUX_LT_75 | 24 | Spectrum falls on fiber in MTP block with relative flux < 0.75 |
| MTPFLUX_LT_50 | 25 | Spectrum falls on fiber in MTP block with relative flux < 0.5 |
APOGEE_RV_FLAG : Bitmask for radial velocity information
This bitmask is used to provide information ms associated with radial velocity measurements. The bitmask provides more context to RV-related bits in
STARFLAG. This bitmask appears at the visit- and combined- level; some bits are set at the visit level (e.g., bits 10, 11) and others at the combined level.
| Bit Name | Binary Digit | Description |
|---|---|---|
| RV_BCFIT | 0 | Initial fit on BC combined spectra, then small RV range |
| RV_BCFIT_FAIL | 1 | Failed fit on BC combined spectra |
| RV_FAINT_FIT | 2 | Faint star, RV fit on reduced range |
| RV_WINDOW_MASK | 3 | Regions masked in RV fit |
| RV_VALUE_ERROR | 4 | Jointfit failed with ValueError |
| RV_RUNTIME_ERROR | 5 | Jointfit failed with RuntimeError |
| RV_ERROR | 6 | Jointfit failed with exception |
| NO_GOOD_VISITS | 8 | No good visits for RV |
| ALL_VISITS_REJECTED | 9 | All visits rejected |
| RV_REJECT | 10 | RV rejected based on fit vs xcorr RV |
| RV_SUSPECT | 11 | RV suspect based on fit vs xcorr RV |
APOGEE_PIXMASK : APOGEE bitmask for individual pixels in a spectrum
This bitmask is used to provide information associated with individual pixels in a one-dimensional spectrum. At the visit level,
PIXMASK refers to the individual spectrum. At the combined level, PIXMASK attempts to appropriately combine the PIXMASKs of the visit spectrum level.
| Bit Name | Binary Digit | Description |
|---|---|---|
| BADPIX | 0 | Pixel marked as BAD in bad pixel mask or from strong persistence jump |
| CRPIX | 1 | Pixel marked as cosmic ray in ap3d |
| SATPIX | 2 | Pixel marked as saturated in ap3d |
| UNFIXABLE | 3 | Pixel marked as unfixable in ap3d |
| BADDARK | 4 | Pixel marked as bad as determined from dark frame |
| BADFLAT | 5 | Pixel marked as bad as determined from flat frame |
| BADERR | 6 | Pixel set to have very high error (not used) |
| NOSKY | 7 | No sky available for this pixel from sky fibers |
| LITTROW_GHOST | 8 | Pixel falls in Littrow ghost, may be affected |
| PERSIST_HIGH | 9 | Pixel falls in high persistence region, may be affected |
| PERSIST_MED | 10 | Pixel falls in medium persistence region, may be affected |
| PERSIST_LOW | 11 | Pixel falls in low persistence region, may be affected |
| SIG_SKYLINE | 12 | Pixel falls near sky line that has significant flux compared with object |
| SIG_TELLURIC | 13 | Pixel falls near telluric line that has significant absorption |
| NOT_ENOUGH_PSF | 14 | Less than 50 percent PSF in good pixels |
| FERRE_MASK | 16 | Pixel masked by FERRE mask < 0.001 |
EXTRATARG : basic targeting information
This bitmask is used to indicate some basic useful targeting information. Some bits are used to tie together similar samples that are indicated through distinct APOGEE-1 and APOGEE-2 targeting bitmasks. Another bit is used to indicate targets that have “duplicate” observations (the same
APOGEE_ID observed in distinct FIELD).
| Bit Name | Binary Digit | Description |
|---|---|---|
| NOT_MAIN | 0 | Not a main sample target |
| COMMISSIONING | 1 | Commissioning observation |
| TELLURIC | 2 | Targeted as telluric |
| APO1M | 3 | APO/NMSU 1M observation |
| DUPLICATE | 4 | Non-primary (not highest S/N) duplicate |
APOGEE2_TARGET1 : APOGEE2 targeting bitmask (1 of 3)
APOGEE-2 targeting information is conveyed in three bitmasks:
APOGEE2_TARGET1, APOGEE2_TARGET2, and APOGEE2_TARGET3 (APOGEE2_TARGET4 was added to the data model, but is not used). The bitmasks provide context for the reason that a target was selected for observations on a plate. Descriptions can be found on Targeting Information.
| Bit Name | Binary Digit | Description |
|---|---|---|
| APOGEE2_ONEBIN_GT_0_5 | 0 | Selected in single (J-Ks)o > 0.5 color bin |
| APOGEE2_TWOBIN_0_5_TO_0_8 | 1 | Selected in "blue" 0.5 < (J-Ks)o < 0.8 color bin |
| APOGEE2_TWOBIN_GT_0_8 | 2 | Selected in "red" (J-Ks)o > 0.8 color bin |
| APOGEE2_IRAC_DERED | 3 | Selected with RJCE-IRAC dereddening |
| APOGEE2_WISE_DERED | 4 | Selected with RJCE-WISE dereddening |
| APOGEE2_SFD_DERED | 5 | Selected with SFD_EBV dereddening |
| APOGEE2_NO_DERED | 6 | Selected with no dereddening |
| APOGEE2_WASH_GIANT | 7 | Selected as Wash+DDO51 photometric giant |
| APOGEE2_WASH_DWARF | 8 | Selected as Wash+DDO51 photometric dwarf |
| APOGEE2_SCI_CLUSTER | 9 | Science cluster candidate member |
| APOGEE2_CLUSTER_CANDIDATE | 10 | Selected as Globular Cluster candidate |
| APOGEE2_SHORT | 11 | Selected as part of a short cohort |
| APOGEE2_MEDIUM | 12 | Selected as part of a medium cohort |
| APOGEE2_LONG | 13 | Selected as part of a long cohort |
| APOGEE2_NORMAL_SAMPLE | 14 | Selected as part of the random sample |
| APOGEE2_MANGA_LED | 15 | Star on a shared MaNGA-led design |
| APOGEE2_ONEBIN_GT_0_3 | 16 | Selected in single (J-Ks)o > 0.3 color bin |
| APOGEE2_WASH_NOCLASS | 17 | Selected because it has no W+D classification |
| APOGEE2_STREAM_MEMBER | 18 | Selected as confirmed halo tidal stream member |
| APOGEE2_STREAM_CANDIDATE | 19 | Selected as potential halo tidal stream member (based on photometry) |
| APOGEE2_DSPH_MEMBER | 20 | Selected as confirmed dSph member (non Sgr) |
| APOGEE2_DSPH_CANDIDATE | 21 | Selected as potential dSph member (non Sgr) (based on photometry) |
| APOGEE2_MAGCLOUD_MEMBER | 22 | Selected as confirmed Mag Cloud member |
| APOGEE2_MAGCLOUD_CANDIDATE | 23 | Selected as potential Mag Cloud member (based on photometry) |
| APOGEE2_RRLYR | 24 | Selected as an RR Lyrae star |
| APOGEE2_BULGE_RC | 25 | Selected as a bulge candidate RC star |
| APOGEE2_SGR_DSPH | 26 | Selected as confirmed Sgr core/stream member |
| APOGEE2_APOKASC_GIANT | 27 | Selected as part of APOKASC "giant" sample |
| APOGEE2_APOKASC_DWARF | 28 | Selected as part of APOKASC "dwarf" sample |
| APOGEE2_FAINT_EXTRA | 29 | "Faint" star (fainter than cohort limit; not required to reach survey S/N requirement) |
| APOGEE2_APOKASC | 30 | Selected as part of the APOKASC program (incl. seismic/gyro targets and others, both the Cygnus field and K2) |
APOGEE2_TARGET2 : APOGEE2 targeting bitmask (2 of 3)
| Bit Name | Binary Digit | Description |
|---|---|---|
| APOGEE2_K2_GAP | 0 | K2 Galactic Archeology Program Star |
| APOGEE2_CCLOUD_AS4 | 1 | California Cloud target |
| APOGEE2_STANDARD_STAR | 2 | Stellar parameters/abundance standard |
| APOGEE2_RV_STANDARD | 3 | Stellar RV standard |
| APOGEE2_SKY | 4 | Sky fiber |
| APOGEE2_EXTERNAL_CALIB | 5 | External survey calibration target (generic flag; others below dedicated to specific surveys) |
| APOGEE2_INTERNAL_CALIB | 6 | Internal survey calibration target (observed in at least 2 of: APOGEE-1, -2N, -2S) |
| APOGEE2_DISK_SUBSTRUCTURE_MEMBER | 7 | Bright time extension: outer disk substructure (Triand, GASS, and A13) members |
| APOGEE2_DISK_SUBSTRUCTURE_CANDIDATE | 8 | Bright time extension: outer disk substructure (Triand, GASS, and A13) candidates |
| APOGEE2_TELLURIC | 9 | Telluric calibrator target |
| APOGEE2_CALIB_CLUSTER | 10 | Selected as calibration cluster member |
| APOGEE2_K2_PLANETHOST | 11 | Planet host in the K2 field |
| APOGEE2_TIDAL_BINARY | 12 | Ancillary KOI Program (Simonian) |
| APOGEE2_LITERATURE_CALIB | 13 | Overlap with high-resolution literature studies |
| APOGEE2_GES_OVERLAP | 14 | Overlap with Gaia-ESO |
| APOGEE2_ARGOS_OVERLAP | 15 | Overlap with ARGOS |
| APOGEE2_GAIA_OVERLAP | 16 | Overlap with Gaia |
| APOGEE2_GALAH_OVERLAP | 17 | Overlap with GALAH |
| APOGEE2_RAVE_OVERLAP | 18 | Overlap with RAVE |
| APOGEE2_COMMIS_SOUTH_SPEC | 19 | Commissioning special targets for APOGEE2S |
| APOGEE2_HALO_MEMBER | 20 | Halo Member |
| APOGEE2_HALO_CANDIDATE | 21 | Halo Candidate |
| APOGEE2_1M_TARGET | 22 | Selected as a 1-m target |
| APOGEE2_MOD_BRIGHT_LIMIT | 23 | Selected in a cohort with H>10 rather than H>7 |
| APOGEE2_CIS | 24 | Carnegie program target |
| APOGEE2_CNTAC | 25 | Chilean community target |
| APOGEE2_EXTERNAL | 26 | Proprietary external target |
| APOGEE2_CVZ_AS4_OBAF | 27 | OBAF stars selected for multi-epoc observations Andrew T. |
| APOGEE2_CVZ_AS4_GI | 28 | Submitted program to be on CVZ plate (Known Planets, ATL, Tayar-Subgiant, Canas-Cool-dwarf) |
| APOGEE2_CVZ_AS4_CTL | 29 | Filler CTL star selected from the TESS Input Catalog |
| APOGEE2_CVZ_AS4_GIANT | 30 | Filler Giant selected with RPMJ |
APOGEE2_TARGET3 : APOGEE2 targeting bitmask (3 of 3)
| Bit Name | Binary Digit | Description |
|---|---|---|
| APOGEE2_KOI | 0 | Selected as part of the long cadence KOI study |
| APOGEE2_EB | 1 | Selected as part of the EB program |
| APOGEE2_KOI_CONTROL | 2 | Selected as part of the long cadence KOI "control sample" |
| APOGEE2_MDWARF | 3 | Selected as part of the M dwarf study |
| APOGEE2_SUBSTELLAR_COMPANIONS | 4 | Selected as part of the substellar companion search |
| APOGEE2_YOUNG_CLUSTER | 5 | Selected as part of the young cluster study (IN-SYNC) |
| APOGEE2_K2 | 6 | Selected as part of the K2 program (BTX and Main Survey) |
| APOGEE2_OBJECT | 7 | This object is an APOGEE-2 target |
| APOGEE2_ANCILLARY | 8 | Selected as an ancillary target |
| APOGEE2_MASSIVE_STAR | 9 | Selected as part of the Massive Star program |
| APOGEE2_QSO | 10 | ancillary QSO pilot program (Albareti) |
| APOGEE2_CEPHEID | 11 | ancillary Cepheid sparse targets (Beaton) |
| APOGEE2_LOW_AV_WINDOWS | 12 | ancillary Deep Disk sample (Bovy) |
| APOGEE2_BE_STAR | 13 | ancillary ASHELS sample (Chojnowski) |
| APOGEE2_YOUNG_MOVING_GROUP | 14 | ancillary young moving group members (Downes) |
| APOGEE2_NGC6791 | 15 | ancillary NGC 6791 star (Geisler) |
| APOGEE2_LABEL_STAR | 16 | ancillary Cannon calibrator Sample (Ness) |
| APOGEE2_FAINT_KEPLER_GIANTS | 17 | ancillary APOKASC faint giants (Pinsonneault) |
| APOGEE2_W345 | 18 | ancillary W3/4/5 star forming complex (Roman-Lopes) |
| APOGEE2_MASSIVE_EVOLVED | 19 | ancillary massive/evolved star targets (Stringfellow) |
| APOGEE2_REDDENING_TARGETS | 20 | ancillary extinction targets (Schlafly) |
| APOGEE2_KEPLER_MDWARF_KOI | 21 | ancillary M dwarf targets (Smith) |
| APOGEE2_AGB | 22 | ancillary AGB sample (Zamora) |
| APOGEE2_M33 | 23 | Ancillary M33 Program (Anguiano) |
| APOGEE2_ULTRACOOL | 24 | Ancillary Ultracool Dwarfs Program (Burgasser) |
| APOGEE2_DISTANT_SEGUE_GIANTS | 25 | Ancillary Distant SEGUE Giants Program (Harding) |
| APOGEE2_CEPHEID_MAPPING | 26 | Ancillary Cepheid Mapping Program (Inno) |
| APOGEE2_SA57 | 27 | Ancillary SA57 Kapteyn Field Program (Majewski) |
| APOGEE2_K2_MDWARF | 28 | Ancillary K2 M dwarf Program (Smith) |
| APOGEE2_RVVAR | 29 | Ancillary RV Variables Program (Troup) |
| APOGEE2_M31 | 30 | Ancillary M31 Program (Zasowski) |
APOGEE_TARGET1 : APOGEE1 targeting bitmask (1 of 2)
APOGEE-1 targeting information is conveyed in two bitmasks,
APOGEE_TARGET1 and APOGEE_TARGET2. The bitmasks provide context for the reason that a target was selected for observations on a plate. Detailed descriptions can be found on Targeting Information.
| Bit Name | Binary Digit | Description |
|---|---|---|
| APOGEE_FAINT | 0 | Star selected in faint bin1 of its cohort |
| APOGEE_MEDIUM | 1 | Star selected in medium bin1 of its cohort |
| APOGEE_BRIGHT | 2 | Star selected in bright bin1 of its cohort |
| APOGEE_IRAC_DERED | 3 | Selected w/ RJCE-IRAC dereddening |
| APOGEE_WISE_DERED | 4 | Selected w/ RJCE-WISE dereddening |
| APOGEE_SFD_DERED | 5 | Selected w/ SFD dereddening |
| APOGEE_NO_DERED | 6 | Selected w/ no dereddening |
| APOGEE_WASH_GIANT | 7 | Selected as giant using Washington photometry |
| APOGEE_WASH_DWARF | 8 | Selected as dwarf using Washington photometry |
| APOGEE_SCI_CLUSTER | 9 | Selected as probable cluster member |
| APOGEE_EXTENDED | 10 | Extended object |
| APOGEE_SHORT | 11 | Selected as "short" (~3-visit) cohort target (includes 1-visit samples) |
| APOGEE_INTERMEDIATE | 12 | Selected as "intermediate" cohort (~6-visit) target |
| APOGEE_LONG | 13 | Selected as "long" cohort (~12- or 24-visit) target |
| APOGEE_DO_NOT_OBSERVE | 14 | Do not observe (again) -- undesired dwarf, galaxy, etc |
| APOGEE_SERENDIPITOUS | 15 | Serendipitous interesting target to be re-observed |
| APOGEE_FIRST_LIGHT | 16 | First Light plate target |
| APOGEE_ANCILLARY | 17 | Ancillary target |
| APOGEE_M31_CLUSTER | 18 | M31 Clusters (Allende Prieto, Schiavon, Bizyaev, OConnell, Shetrone) |
| APOGEE_MDWARF | 19 | RVs of M Dwarfs (Blake, Mahadevan, Hearty, Deshpande, Nidever, Bender, Crepp, Carlberg, Terrien, Schneider) -- both original list and second-round extension |
| APOGEE_HIRES | 20 | Stars with Optical Hi-Res Spectra (Fabbian, Allende Prieto, Smith, Cunha) |
| APOGEE_OLD_STAR | 21 | Oldest Stars in Galaxy (Harding, Johnson) |
| APOGEE_DISK_RED_GIANT | 22 | Ages/Compositions? of Disk Red Giants (Johnson, Epstein, Pinsonneault, Lai, Bird, Schonrich, Chiappini) |
| APOGEE_KEPLER_EB | 23 | Kepler EBs (Mahadevan, Fleming, Bender, Deshpande, Hearty, Nidever, Terrien) |
| APOGEE_GC_PAL1 | 24 | Globular Cluster Pops in the MW (Simmerer, Ivans, Shetrone) |
| APOGEE_MASSIVE_STAR | 25 | Massive Stars in the MW (Herrero, Garcia-Garcia, Ramirez-Alegria) |
| APOGEE_SGR_DSPH | 26 | Sgr (dSph) member |
| APOGEE_KEPLER_SEISMO | 27 | Kepler asteroseismology program target (Epstein) |
| APOGEE_KEPLER_HOST | 28 | planet-host program target (Epstein) |
| APOGEE_FAINT_EXTRA | 29 | as "faint" target in low-target-density fields |
| APOGEE_SEGUE_OVERLAP | 30 | SEGUE overlap |
APOGEE_TARGET2 : APOGEE1 targeting bitmask (2 of 2)
| Bit Name | Binary Digit | Description |
|---|---|---|
| LIGHT_TRAP | 0 | Light trap |
| APOGEE_FLUX_STANDARD | 1 | Flux standard |
| APOGEE_STANDARD_STAR | 2 | Stellar abundance/parameters standard |
| APOGEE_RV_STANDARD | 3 | RV standard |
| APOGEE_SKY | 4 | Sky |
| APOGEE_SKY_BAD | 5 | Selected as sky but IDed as bad (via visual examination or observation) |
| APOGEE_GUIDE_STAR | 6 | Guide star |
| APOGEE_BUNDLE_HOLE | 7 | Bundle hole |
| APOGEE_TELLURIC_BAD | 8 | Selected as telluric std but IDed as too red (via SIMBAD or observation) |
| APOGEE_TELLURIC | 9 | Hot (telluric) standard |
| APOGEE_CALIB_CLUSTER | 10 | Known calibration cluster member |
| APOGEE_BULGE_GIANT | 11 | Selected as probable giant in bulge |
| APOGEE_BULGE_SUPER_GIANT | 12 | Selected as probable supergiant in bulge |
| APOGEE_EMBEDDEDCLUSTER_STAR | 13 | Young Nebulous Clusters (Covey, Tan) |
| APOGEE_LONGBAR | 14 | Milky Way Long Bar (Zasowski) |
| APOGEE_EMISSION_STAR | 15 | Be Emission Line Stars (Chojnowski, Whelan) |
| APOGEE_KEPLER_COOLDWARF | 16 | Kepler Cool Dwarfs (van Saders) |
| APOGEE_MIRCLUSTER_STAR | 17 | Outer Disk MIR Clusters (Beaton) |
| APOGEE_RV_MONITOR_IC348 | 18 | RV Variability in IC348 (Nidever, Covey(?)) |
| APOGEE_RV_MONITOR_KEPLER | 19 | RV Variability for Kepler Planet Hosts and Binaries (Deshpande, Fleming, Mahadevan) |
| APOGEE_GES_CALIBRATE | 20 | GAIA-ESO calibration targets |
| APOGEE_BULGE_RV_VERIFY | 21 | RV Verification (Nidever) |
| APOGEE_1MTARGET | 22 | Selected as a 1-m target (Holtzman) |
APOGEE_MEMBERFLAG : Bitmask to identify likely members of clusters/dwarf Spheroidals
This bitmask is produced to indicate the likely membership of a given target in intentionally targeted star clusters and dwarf galaxies. Each bit refers to a specific star cluster or dwarf galaxy. A bit is set if a given target meets a set of membership criteria, including its sky position, mean radial velocity, and proper motions.
MEMBER is convenient but may not be applicable for all scientific applications.
| Bit Name | Binary Digit | Description |
|---|---|---|
| M92 | 0 | Likely member of M92 |
| M15 | 1 | Likely member of M15 |
| M53 | 2 | Likely member of M53 |
| N5466 | 3 | Likely member of N5466 |
| N4147 | 4 | Likely member of N4147 |
| M2 | 5 | Likely member of M2 |
| M13 | 6 | Likely member of M13 |
| M3 | 7 | Likely member of M3 |
| M5 | 8 | Likely member of M5 |
| M12 | 9 | Likely member of M12 |
| M107 | 10 | Likely member of M107 |
| M71 | 11 | Likely member of M71 |
| N2243 | 12 | Likely member of N2243 |
| Be29 | 13 | Likely member of Be29 |
| N2158 | 14 | Likely member of N2158 |
| M35 | 15 | Likely member of M35 |
| N2420 | 16 | Likely member of N2420 |
| N188 | 17 | Likely member of N188 |
| M67 | 18 | Likely member of M67 |
| N7789 | 19 | Likely member of N7789 |
| Pleiades | 20 | Likely member of Pleiades |
| N6819 | 21 | Likely member of N6819 |
| ComaBer | 22 | Likely member of ComaBer |
| N6791 | 23 | Likely member of N6791 |
| N5053 | 24 | Likely member of N5053 |
| M68 | 25 | Likely member of M68 |
| N6397 | 26 | Likely member of N6397 |
| M55 | 27 | Likely member of M55 |
| N5634 | 28 | Likely member of N5634 |
| M22 | 29 | Likely member of M22 |
| M79 | 30 | Likely member of M79 |
| N3201 | 31 | Likely member of N3201 |
| M10 | 32 | Likely member of M10 |
| N6752 | 33 | Likely member of N6752 |
| Omegacen | 34 | Likely member of Omegacen |
| M54 | 35 | Likely member of M54 |
| N6229 | 36 | Likely member of N6229 |
| Pal5 | 37 | Likely member of Pal5 |
| N6544 | 38 | Likely member of N6544 |
| N6522 | 39 | Likely member of N6522 |
| N288 | 40 | Likely member of N288 |
| N362 | 41 | Likely member of N362 |
| N1851 | 42 | Likely member of N1851 |
| M4 | 43 | Likely member of M4 |
| N2808 | 44 | Likely member of N2808 |
| Pal6 | 45 | Likely member of Pal6 |
| 47TUC | 46 | Likely member of 47TUC |
| Pal1 | 47 | Likely member of Pal1 |
| N6539 | 48 | Likely member of N6539 |
| N6388 | 49 | Likely member of N6388 |
| N6441 | 50 | Likely member of N6441 |
| N6316 | 51 | Likely member of N6316 |
| N6760 | 52 | Likely member of N6760 |
| N6553 | 53 | Likely member of N6553 |
| N6528 | 54 | Likely member of N6528 |
| DRACO | 55 | Likely member of DRACO |
| URMINOR | 56 | Likely member of URMINOR |
| BOOTES1 | 57 | Likely member of BOOTES1 |
| SEXTANS | 58 | Likely member of SEXTANS |
| FORNAX | 59 | Likely member of FORNAX |
| SCULPTOR | 60 | Likely member of SCULPTOR |
| CARINA | 61 | Likely member of CARINA |
