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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