This describes the columns and flags in the smf/cmf files. They are listed in psModules/src/objects/pmSourceIO_CMF_PS1_V1.c, this is a slightly more descriptive version.

Columns

• IPP_IDET - detection id (increment from 0 per chip - gaps are from magic)
• X_PSF -position (in pixels
• Y_PSF -position in pixels
• X_PSF_SIGMA -position sigma
• Y_PSF_SIGMA -position sigma
• POSANGLE - position angle of the instrument coordinate system at source (ie, the angle between north and the y-axis) in degrees
• PLTSCALE - plate-scale at the source position (it varies across the exposure!) in arcsec
• PSF_INST_MAG - PSF Instrumental mag
• PSF_INST_MAG - error for that
• AP_MAG - aperture mag
• AP_MAG_RADIUS - aperture mag radius (pixels)
• PEAK_FLUX_AS_MAG - as it says, it is the flux (counts/pixel) for the peak pixel expressed as an instrumental magnitude (-2.5*log(flux))
• CAL_PSF_MAG - calibrated PSF MAG
• CAL_PS_MAG_SIG - error
• RA_PSF - ra
• DEC_PSF - dec
• SKY - background in counts (DN, not electrons)
• SKY_SIGMA -error
• PSF_CHISQ - chisq of psf
• CR_NSIGMA - cosmic ray
• EXT_NSIGMA - extended source
• PSF_MAJOR - major axis (pixel)
• PSF_MINOR - minor axis (pixel)
• PSF_THETA - angle
• PSF_QF - the psf-weighted fraction of unmasked pixels:
  • \Sum_i (psf_i * !masked) / \Sum_i (psf_i)
• PSF_NDOF - number of degrees of freedom for the fit -- for the diff detections, the only free parameter is the flux, so N_DOF = N_PIX - 1; in other cases, there may be more parameters (eg, position, size, etc).
• PSF_NPIX - number of pixels for fit
• MOMENTS_XX - second moment in x:
  • \Sum ((x_i - x_o)^2 f_i) / \Sum (f_i) where x_o is the centroid \Sum (x_i f_i) / \Sum f_i
• MOMENTS_XY - second moment in xy:
  • \Sum ((x_i - x_o)(y_i - y_o)^2 f_i) / \Sum (f_i)
• MOMENTS_YY - second moment in xy
  • \Sum ((y_i - y_o)^2 f_i) / \Sum (f_i)
• FLAGS - see below
• N_FRAMES - this is not currently set, but it is supposed to have the value of the number of input images overlapping the center of the source (for warp-warp diff, it would be 2, for a single image it would be 1, for a stack it may be something else).
• PADDING - a dummy block of data needed to fit the rows into 8-byte boundaries (this lets me read into structures as a bulk byte read operation).

Flags

DEFAULT	0	Initial value: resets all bits
PSFMODEL	1	Source fitted with a psf model (linear or non-linear)
EXTMODEL	2	Source fitted with an extended-source model
FITTED	4	Source fitted with non-linear model (PSF or EXT; good or bad)
FITFAIL	8	Fit (non-linear) failed (non-converge, off-edge, run to zero)
POORFIT	16	Fit succeeds, but low-SN, high-Chisq, or large (for PSF -- drop?)
PAIR	32	Source fitted with a double psf
PSFSTAR	64	Source used to define PSF model
SATSTAR	128	Source model peak is above saturation
BLEND	256	Source is a blend with other sourcers
EXTERNALPOS"	512	Source based on supplied input position
BADPSF	1024	Failed to get good estimate of object's PSF
DEFECT	2048	Source is thought to be a defect
SATURATED	4096	Source is thought to be saturated pixels (bleed trail)
CR_LIMIT	8192	Source has crNsigma above limit
EXT_LIMIT	16384	Source has extNsigma above limit
MOMENTS_FAILURE	32768	could not measure the moments
SKY_FAILURE	65536	could not measure the local sky
SKYVAR_FAILURE	131072	could not measure the local sky variance
MOMENTS_SN	262144	moments not measured due to low S/N
BIG_RADIUS	1048576	poor moments for small radius, try large radius
AP_MAGS	2097152	source has an aperture magnitude
BLEND_FIT	4194304	source was fitted as a blend
EXTENDED_FIT	8388608	full extended fit was used
EXTENDED_STATS	16777216	extended aperture stats calculated
LINEAR_FIT	33554432	source fitted with the linear fit
NONLINEAR_FIT	67108864	source fitted with the non-linear fit
RADIAL_FLUX	134217728	radial flux measurements calculated
SIZE_SKIPPED	268435456	size could not be determined
ON_SPIKE	536870912	peak lands on diffraction spike
ON_GHOST	1073741824	peak lands on ghost or glint
OFF_CHIP	2147483648	peak lands off edge of chip
NOCAL	4294967296	detection ignored for this analysis (photcode, time range) -- internal only
POOR_PHOTOM	8589934592	detection is photometry outlier
SKIP_PHOTOM	17179869184	detection was ignored for photometry measurement
MEAS_AREA	34359738368	detection near image edge
POOR_ASTROM	68719476736	detection is astrometry outlier
SKIP_ASTROM	137438953472	detection was ignored for astrometry measurement
USED_OBJ	274877906944	detection was used during opdate objects
USED_CHIP	549755813888	detection was used during update chips
BLEND_MEAS	1099511627776	detection is within radius of multiple objects
BLEND_OBJ	2199023255552	multiple detections within radius of object
BLEND_MEAS_X	17592186044416	detection is within radius of multiple objects across catalogs
ARTIFACT	35184372088832	detection is thought to be non-astronomical