| name | value | description |
| HIZQSO82 | 0x0000000000000001 | High-redshift quasar candidate selected from color cuts in SDSS ugriz and UKIDSS YJHK photometry |
| HIZQSOIR | 0x0000000000000002 | High-redshift quasar candidate selected from color cuts in SDSS ugriz and UKIDSS YJHK photometry in the Stripe 82 footprint |
| KQSO_BOSS | 0x0000000000000004 | Quasar candidate selected from UKIDSS K-band photometry |
| QSO_VAR | 0x0000000000000008 | Candidate quasar in Stripe 82 survey area, selected from variability alone |
| QSO_VAR_FPG | 0x0000000000000010 | Candidate quasar in Stripe 82 survey area, selected from variability alone |
| RADIO_2LOBE_QSO | 0x0000000000000020 | SDSS point source object near the midpoint of double-lobed objects identified in FIRST Catalogs |
| STRIPE82BCG | 0x0000000000000040 | The brightest cluster member of a galaxy cluster or group identified in the Stripe 82 survey area |
| QSO_SUPPZ | 0x0000000000000080 | Supplemental quasar target (not used in public DR12 data) |
| QSO_VAR_SDSS | 0x0000000000000100 | Supplemental variabile quasar target (not used in public DR12 data) |
| QSO_WISE_SUPP | 0x0000000000000200 | Supplemental WISE-selected quasar target (not used in public DR12 data) |
| QSO_WISE_FULL_SKY | 0x0000000000000400 | Quasar selected from the WISE All-Sky Survey |
| XMMSDSS | 0x0000000000000800 | Hard x-ray-selected AGN from XMM |
| IAMASERS | 0x0000000000001000 | Known or potential maser |
| DISKEMITTER_REPEAT | 0x0000000000002000 | Candidate massive binary black hole pair |
| WISE_BOSS_QSO | 0x0000000000004000 | Quasar identified in the WISE All-Sky Survey |
| QSO_XD_KDE_PAIR | 0x0000000000008000 | Candidate closely-separated quasar pair |
| CLUSTER_MEMBER | 0x0000000000010000 | Member of a galaxy cluster selected from ROSAT All-Sky Survey data |
| SPOKE2 | 0x0000000000020000 | Candidate binary pair in which one star is an M dwarf |
| FAINT_ELG | 0x0000000000040000 | Blue star-forming galaxy selected from CFHT-LS photometry |
| PTF_GAL | 0x0000000000080000 | A nearby galaxy identified in PTF imaging with an SDSS counterpart |
| QSO_STD | 0x0000000000100000 | A standard star targeted to improve BOSS spectrophotometric calibration |
| HIZ_LRG | 0x0000000000200000 | A candidate z > 0.6 LRG, selected using a narrower r-i color constraint and observed at higher priority |
| LRG_ROUND3 | 0x0000000000400000 | A candidate z > 0.6 LRG, selected using a broader r-i color constraint and observed at lower priority |
| WISE_COMPLETE | 0x0000000000800000 | Galaxy in the same redshift range as the BOSS CMASS sample, but selected with a more relaxed color cut |
| TDSS_PILOT | 0x0000000001000000 | Objects identified from PanSTARRS imaging selected by variability |
| SPIDERS_PILOT | 0x0000000002000000 | Objects identified by cross-matching SDSS imaging with XMM-Newton x-ray imaging |
| TDSS_SPIDERS_PILOT | 0x0000000004000000 | Objects identified by both TDSS and SPIDERS selection criteria |
| QSO_VAR_LF | 0x0000000008000000 | Candidate quasar in stripe 82, selected by color and variability |
| TDSS_PILOT_PM | 0x0000000010000000 | Objects identified using X-ray imaging that has high proper motions |
| TDSS_PILOT_SNHOST | 0x0000000020000000 | Objects identified in PanSTARRS imaging that showed transient behavior in extended objects |
| FAINT_HIZ_LRG | 0x0000000040000000 | Candidate galaxy in the redshift range 0.6 < z 0.9, defined by color cuts |
| QSO_EBOSS_W3_ADM | 0x0000000080000000 | Candidate quasar, defined by one of the complex color cuts recorded in the W3bitmask parameter of the original targeting file |
| XMM_PRIME | 0x0000000100000000 | Candidate AGN identified from the XMM-XXL survey observed at higher priority |
| XMM_SECOND | 0x0000000200000000 | Candidate AGN identified from the XMM-XXL survey observed at lower priority |
| SEQUELS_ELG | 0x0000000400000000 | Emission-line galaxy targeted by the SEQUELS program |
| GES | 0x0000000800000000 | Star observed by the Gaia/ESO Survey (GES) |
| SEGUE1 | 0x0000001000000000 | Star observed by the prior SDSS spectroscopic SEGUE-1 survey |
| SEGUE2 | 0x0000002000000000 | Star observed by SEGUE-2 |
| SDSSFILLER | 0x0000004000000000 | Star in the GES survey area, targeted from prior SDSS photometry |
| SEQUELS_ELG_LOWP | 0x0000008000000000 | Emission-line galaxy targeted by the SEQUELS program at lower priority |
| 25ORI_WISE | 0x0000010000000000 | WISE-selected target near the star 25 Ori |
| 25ORI_WISE_W3 | 0x0000020000000000 | WISE-selected target near the star 25 Ori, selected from data in the W3 band |
| KOEKAP_STAR | 0x0000040000000000 | WISE-selected source in the star-forming region Kappa Ori, selected from WISE infrared excess |
| KOE2023_STAR | 0x0000080000000000 | WISE-selected source in the star-forming region NGC 2023, selected from WISE infrared excess |
| KOE2068_STAR | 0x0000100000000000 | WISE-selected source in the star-forming region NGC 2068, selected from WISE infrared excess |
| KOE2023BSTAR | 0x0000200000000000 | Other WISE-selected source in the star-forming region NGC 2023 |
| KOE2068BSTAR | 0x0000400000000000 | Other WISE-selected source in the star-forming region NGC 2068 |
| KOEKAPBSTAR | 0x0000800000000000 | Other WISE-selected source in the star-forming region Kappa Ori |
| COROTGESAPOG | 0x0001000000000000 | Star observed by both the CoRoT survey and by APOGEE |
| COROTGES | 0x0002000000000000 | Star observed by both CoRoT and GES |
| APOGEE | 0x0004000000000000 | Star in the CoRoT survey area, not observed by CoRoT but with an APOGEE spectrum |
| 2MASSFILL | 0x0008000000000000 | Star in the CoRoT survey area targeted from 2MASS photometry |
| TAU_STAR | 0x0010000000000000 | Spitzer-selected source in the Taurus Heiles 2 molecular cloud |
| SEQUELS_TARGET | 0x0020000000000000 | A target from the SEQUELS program (no longer used, replaced by EBOSS_TARGET0 flag) |
| RM_TILE1 | 0x0040000000000000 | AGN selected for reverberation mapping study at high priority |
| RM_TILE2 | 0x0080000000000000 | AGN selected for reverberation mapping study at lower priority |
| QSO_DEEP | 0x0100000000000000 | Candidate quasar selected by time variability |
| LBG | 0x0200000000000000 | Candidate Lyman-break galaxy selected by color |
| ELAIS_N1_LOFAR | 0x0400000000000000 | LOFAR source selected with RMS noise criteria |
| ELAIS_N1_FIRST | 0x0800000000000000 | Source detected in the FIRST radio catalog |
| ELAIS_N1_GMRT_GARN | 0x1000000000000000 | Source identified from deeper GMRT radio data |
| ELAIS_N1_GMRT_TAYLOR | 0x2000000000000000 | Fainter source identified from deeper GMRT radio data |
| ELAIS_N1_JVLA | 0x4000000000000000 | Very faint source detected in JVLA radio data |
