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ANCILLARY_TARGET1: Objects selected as BOSS Ancillary Targets

The presence of a nonzero value for this target flag indicates that the object was selected through one or more of the BOSS ancillary target selection programs.

If you don't see the ancillary target bit you're looking for here, try the other ancillary target flag parameter, ANCILLARY_TARGET2.

Bit name Binary digit Description
AMC 0 Candidate Am CVn variables in Stripe 82
FLARE1 1 Flaring M stars in Stripe 82 (year 1 targets)
FLARE2 2 Flaring M stars in Stripe 82 (year 2 targets)
HPM 3 High Proper Motion stars in Stripe 82
LOW_MET 4 Low-metallicity M dwarfs in Stripe 82
VARS 5 Unusual variable objects (colors outside the stellar and quasar loci) in Stripe 82
BLAZGVAR 6 A flag used in a pilot version of the ancillary targeting program High-Energy Blazars and Optical Counterparts to Gamma-Ray Sources; no longer used
BLAZR 7 A flag used in a pilot version of the ancillary targeting program High-Energy Blazars and Optical Counterparts to Gamma-Ray Sources; no longer used
BLAZXR 8 A target that might have a match with a Fermi source, but which is now below the detection limits of the early Fermi source catalogs
BLAZXRSAM 9 A flag used in a pilot version of the ancillary targeting program High-Energy Blazars and Optical Counterparts to Gamma-Ray Sources; no longer used
BLAZXRVAR 10 A flag used in a pilot version of the ancillary targeting program High-Energy Blazars and Optical Counterparts to Gamma-Ray Sources; no longer used
XMMBRIGHT 11 An object that matches a serendipitous x-ray source from the Second XMM-Newton Serendipitous Source Catalog (2XMMi), with bright i magnitudes (i < 20.5) and bright 2-12 keV fluxes (f2-12 keV > 5 x 10-14 erg*cm-2*s-1)
XMMGRIZ 12 An object that matches a serendipitous x-ray source from the Second XMM-Newton Serendipitous Source Catalog (2XMMi), with outlier SDSS colors (g - r > 1.2 or r - i > 1.0 or i - z > 1.4)
XMMHR 13 An object that matches a serendipitous x-ray source from the Second XMM-Newton Serendipitous Source Catalog (2XMMi), with unusual hardness ratios in the HR2-HR3 plane
XMMRED 14 An object that matches a serendipitous x-ray source from the Second XMM-Newton Serendipitous Source Catalog (2XMMi) with highly red SDSS colors (g - i > 1.0)
FBQSBAL 15 Broad absorption line (BAL) quasar with spectrum from the FIRST Bright Quasar Survey
LBQSBAL 16 Broad absorption line (BAL) quasar with spectrum from the Large Bright Quasar Survey
ODDBAL 17 Broad absorption line (BAL) quasar with various unusual properties (selected by hand)
OTBAL 18 Photometrically-selected overlapping-trough (OT) broad absorption line (BAL) quasar
PREVBAL 19 Broad absorption line (BAL) quasar with prior spectrum from SDSS-I/-II
VARBAL 20 Photometrically-selected candidate broad absorption line (BAL) quasar
BRIGHTGAL 21 Bright (r < 16) galaxies whose spectra were missed by the original SDSS spectroscopic survey
QSO_AAL 22 Radio-quiet variable quasar candidates with one absorption system associated with the quasar (v ≤ 5000 km/s in the quasar rest frame)
QSO_AALS 23 Radio-quiet variable quasar candidates with multiple absorption systems (associated and/or intervening)
QSO_IAL 24 Radio-quiet variable quasar candidates with one absorption system in the intervening space along our line-of-sight (v > 5000 km/s in the quasar rest frame)
QSO_RADIO 25 Radio-loud variable quasar candidates with multiple absorption systems (associated and/or intervening)
QSO_RADIO_AAL 26 Radio-loud variable quasar candidates with one absorption system associated with the quasar (v ≤ 5000 km/s in the quasar rest frame)
QSO_RADIO_IAL 27 Radio-loud variable quasar candidates with one absorption system in the intervening space along our line-of-sight (v > 5000 km/s in the quasar rest frame)
QSO_NOAALS 28 Radio-quiet variable quasar candidates with no associated absorption systems and multiple intervening absorption systems
QSO_GRI 29 Candidate high-redshift quasar (z > 3.6), selected in gri color space
QSO_HIZ 30 Candidate high-redshift quasar (z > 5.6), detected only in SDSS i and z filters.
QSO_RIZ 31 Candidate high-redshift quasar (z > 4.5), selected in riz color space
RQSS_SF 32 Candidate reddened quasar ( E(B-V)) > 0.5 ), selected from an SDSS primary catalog object matched with FIRST catalog data
RQSS_SFC 33 Candidate reddened quasar ( E(B-V)) > 0.5 ), selected from an SDSS child catalog object matched with FIRST catalog data
RQSS_STM 34 Candidate reddened quasar ( E(B-V)) > 0.5 ), selected from an SDSS primary catalog object matched with 2MASS catalog data
RQSS_STMC 35 Candidate reddened quasar ( E(B-V)) > 0.5 ), selected from an SDSS child catalog object matched with 2MASS catalog data
SN_GAL1 36 Likely host galaxy for an SDSS-II supernova, with the BOSS fiber assigned to the galaxy closest to the supernova's position
SN_GAL2 37 Likely host galaxy for an SDSS-II supernova, with the BOSS fiber assigned to the second-closest galaxy
SN_GAL3 38 Likely host galaxy for an SDSS-II supernova, with the BOSS fiber assigned to the third-closest galaxy
SN_LOC 39 Likely host galaxy for an SDSS-II supernova, with the BOSS fiber assigned to the position of the original supernova
SPEC_SN 40 Likely host galaxy for an SDSS-II supernova, where the original supernova was identified from SDSS spectroscopic data
SPOKE 41 Widely-separated binary systems in which both stars are low-mass (spectral class M)
WHITEDWARF_NEW 42 White dwarf candidate whose spectrum had not been observed previously by the SDSS
WHITEDWARF_SDSS 43 White dwarf candidate with a pre-existing SDSS spectrum
BRIGHTERL 44 Bright L dwarf candidate (iPSF < 19.5, iPSF - zPSF) > 1.14)
BRIGHTERM 45 Bright M dwarf candidate (iPSF < 19.5, iPSF - zPSF) < 1.14)
FAINTERL 46 Faint L dwarf candidate (iPSF > 19.5, iPSF - zPSF) > 1.14)
FAINTERM 47 Faint M dwarf candidate (iPSF > 19.5, iPSF - zPSF) < 1.14)
RED_KG 48 Giant star in the Milky Way outer halo
RVTEST 49 Known giant star selected as a test of radial velocity measurement techniques
BLAZGRFLAT 50 Candidate optical counterpart to a Fermi gamma-ray source, within 2" of a CRATES radio source and within a Fermi error ellipse
BLAZGRQSO 51 Candidate optical counterpart to a Fermi gamma-ray source, within 2" of a FIRST radio source and within a Fermi error ellipse
BLAZGX 52 Candidate optical counterpart to a Fermi gamma-ray source, within 1' of a ROSAT All-Sky Survey x-ray source and within a Fermi error ellipse, and without typical signs of blazar activity
BLAZGXQSO 53 Candidate optical counterpart to a Fermi gamma-ray source, within 1' of a ROSAT All-Sky Survey x-ray source and within a Fermi error ellipse
BLAZGXR 54 Candidate optical counterpart to a Fermi gamma-ray source, with matches in both radio and x-ray wavelengths: within 1' of a ROSAT All-Sky Survey x-ray source, within 2" of a FIRST radio source, and within a Fermi error ellipse
BLUE_RADIO 56 Likely star-forming AGN: blue galaxies that match with FIRST radio sources
CHANDRAV1 57 An object with a Chandra match that is likely to be a star-forming galaxy with black hole accretion
CXOBRIGHT 58 An object that matches a serendipitous x-ray source from the Chandra Source Catalog, with bright i magnitudes (i < 20.0) and bright 2-8 keV fluxes (f2-8 keV > 5 x 10-14 erg*cm-2*s-1)
CXOGRIZ 59 An object that matches a serendipitous x-ray source from the Chandra Source Catalog, with outlier SDSS colors (g - r > 1.2 or r - i > 1.0 or i - z > 1.4)
CXORED 60 An object that matches a serendipitous x-ray source from the Chandra Source Catalog, with highly red SDSS colors (g - i > 1.0)
ELG 61 Luminous blue galaxy with gPSF < 22.5
GAL_NEAR_QSO 62 A galaxy that lies between 0.006' and 1' of the line-of-sight for a spectroscopically-confirmed quasar
MTEMP 63 Template M-stars observed as a comparison sample in Stripe 82

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