ANCILLARY_TARGET2: More 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_TARGET1.

Bit name	Binary digit	Description
HIZQSO82	0	High-redshift quasar candidate selected from color cuts in SDSS ugriz and UKIDSS YJHK photometry
HIZQSOIR	1	High-redshift quasar candidate selected from color cuts in SDSS ugriz and UKIDSS YJHK photometry in the Stripe 82 footprint
KQSO_BOSS	2	Quasar candidate selected from UKIDSS K-band photometry
QSO_VAR	3	Candidate quasar in Stripe 82 survey area, selected from variability alone
QSO_VAR_FPG	4	Candidate quasar in Stripe 82 survey area, selected from variability alone
RADIO_2LOBE_QSO	5	SDSS point source object near the midpoint of double-lobed objects identified in FIRST Catalogs
STRIPE82BCG	6	The brightest cluster member of a galaxy cluster or group identified in the Stripe 82 survey area
QSO_SUPPZ	7	A subset of SDSS-I/-II quasars with 1.8 < z < 2.15 that were reobserved with the BOSS spectrograph to measure metal absorption free of any effects from the Lyman-α forest
QSO_VAR_SDSS	8	Quasars selected by photometric variability in the overlap regions between stripes of SDSS-I/-II imaging, accounting for roughly 30% of the total BOSS footprint
QSO_WISE_SUPP	9	Quasar targets selected on their mid-infrared colors from the WISE satellite, thought to be z>2.2 quasars, as a supplement to the primary BOSS quasar sample.