Match Structures

A match structure FITS file consists of two extensions. There is no useful information in the header. The second FITS extension is simply an array of all the cal structures that were stored in the second extensions of the cobj files that went into creating the match structure.

The first FITS extension contains the match structure itself, which is an array of structures, one element for each object in the calibrated object lists that compose the match structure. The fields in each structure are defined in Table C.3, where $nobj$ is the number of objects in the structure, and $nobs$ is the number of observations included in the match.

Table C.3: Fields that go into a ROTSE-III match structure. Values that vary for every object in each field, such as magnitude, are two-dimensional arrays, while values that only vary from observation to observation, such as the average magnitude, are one-dimensional arrays. The overall limits on the R.A. and Decl. coordinates are four floating point numbers. The variables $nobs$ and $nobj$ refer to the number of observations and the number of objects, respectively, contained in the match structure

Field Name	Datatype	Format	Contents
KX	FLOAT	Array[$nobs$, 4, 4]	Coordinate Conversion Matrix
KY	FLOAT	Array[$nobs$, 4, 4]	Same
JD	DOUBLE	Array[$nobs$]	Date in Modified Julian Day
EXPTIME	FLOAT	Array[$nobs$]	Exposure Time
IMAGENAME	STRING	Array[$nobs$]	Image file name
RAC	FLOAT	Array[$nobs$]	Center of image
DECC	FLOAT	Array[$nobs$]	Center of image
RAL	FLOAT		Image limits
RAH	FLOAT
DECL	FLOAT
DECH	FLOAT
M	FLOAT	Array[$nobs$, $nobj$]	Object magnitude
MERR	FLOAT	Array[$nobs$, $nobj$]	Uncertainty in M from SExtractor
FLAGS	INT	Array[$nobs$, $nobj$]	SExtractor flags
DRA	LONG	Array[$nobs$, $nobj$]	Observation Position * 1000000
DDEC	LONG	Array[$nobs$, $nobj$]	Same
RFLAGS	BYTE	Array[$nobs$, $nobj$]	ROTSE flags
MSYS	BYTE	Array[$nobs$, $nobj$]	Systematic Error Estimate
RA	DOUBLE	Array[$nobj$]	Mean location of object (deg)
DEC	DOUBLE	Array[$nobj$]	Same (deg)
NUMOBS	INT	Array[$nobj$]	# of obs in which object was in FOV
CONSEC	BYTE	Array[$nobj$]	Was object in consecutive obs?
NGOOD	INT	Array[$nobj$]	# of good obs in which obj was detected
MAVG	FLOAT	Array[$nobj$]	Mean magnitude of each object
MSTD	FLOAT	Array[$nobj$]	RMS scatter in M for each object
M_LIM	FLOAT	Array[$nobs$]	Limiting magnitude of each obs