TABLE QsoBunch

describes each bunch of matching QSO candidate objects from Target, Spec, and Best databases using a search radius of 1.5 arcseconds.

One distinguished object is the head of a bunch. If the bunch contains a target object, then we pick the mode = (primary, secondary, outside) in that order. if there are multiple primaries then the lowest objID wins. if there is no target in in the bunch, then the (primary) SpecObj wins. if there is no target or specobj, then the (primary) Best obj wins. Each bunch object points to its BunchHead and all objects with the same BunchHead form a bunch. (starting with a 1.5 arcsecond radius, we do a transitive closure (friends of friends) to build the bunch. The BunchHead describes the bundle, its center point (head's RA, DEC) and the counts of bunch members of each type.

name type length unit ucd description

HeadObjID bigint 8 Bunch Head object ID

HeadObjType char 6 type of head object 'TARGET', 'SPEC', 'BEST'

ra float 8 deg right ascencion of head object

dec float 8 deg declination of head object

targetObjs int 4 # target QSO candidates in

specObjs int 4 # spectro QSO candidates in

bestObjs int 4 # best QSO candidates in bunch

targetPrimaries int 4 # target primaries in bunch

specPrimaries int 4 # spec SciencePrimaries in bunch

bestPrimaries int 4 # best primaries in bunch

name	type	length	unit	ucd	description
HeadObjID	bigint	8			Bunch Head object ID
HeadObjType	char	6			type of head object 'TARGET', 'SPEC', 'BEST'
ra	float	8	deg		right ascencion of head object
dec	float	8	deg		declination of head object
targetObjs	int	4			# target QSO candidates in
specObjs	int	4			# spectro QSO candidates in
bestObjs	int	4			# best QSO candidates in bunch
targetPrimaries	int	4			# target primaries in bunch
specPrimaries	int	4			# spec SciencePrimaries in bunch
bestPrimaries	int	4			# best primaries in bunch