Description: Contains metadata related to an individual OTA image that comprises a portion of the full exposure. The characterization of the image quality, the detrends applied, and the astrometric solution from the raw pixels (X,Y) to the detector focal plane (L,M) is provided.
Name
Unit
Data Type
Size
Default Value
Description
imageID
dimensionless
BIGINT
8
NA
Unique image identifier. Constructed as (100 * frameID + ccdID).
frameID
dimensionless
INT
4
NA
Unique frame/exposure identifier.
ccdID
dimensionless
SMALLINT
2
NA
OTA identifier based on location in the focal plane, specific to an individual device.
photoCalID
dimensionless
INT
4
NA
Photometric calibration identifier. Details in the PhotoCal table.
filterID
dimensionless
TINYINT
1
NA
Filter identifier. Details in the Filter table.
bias
adu
REAL
4
-999
OTA bias level.
biasScat
adu
REAL
4
-999
Scatter in bias level.
sky
Janskys/arcsec^2
REAL
4
-999
Mean sky brightness.
skyScat
Janskys/arcsec^2
REAL
4
-999
Scatter in mean sky brightness.
nDetect
dimensionless
INT
4
-999
Number of detections in this image.
detectionThreshold
magnitudes
REAL
4
-999
Reference magnitude for detection efficiency calculation.
astroScat
arcsec
REAL
4
-999
Measurement of the calibration (not astrometric error) defined to be the sum in quadrature of the standard deviations in the X and Y directions.
photoScat
magnitudes
REAL
4
-999
Photometric scatter relative to reference catalog.
nAstroRef
dimensionless
INT
4
-999
Number of astrometric reference sources.
nPhotoRef
dimensionless
INT
4
-999
Number of photometric reference sources.
recalAstroScatX
arcsec
REAL
4
-999
Measurement of the re-calibration (not astrometric error) in the X direction.
recalAstroScatY
arcsec
REAL
4
-999
Measurement of the re-calibration (not astrometric error) in the Y direction.
recalNAstroStars
dimensionless
INT
4
-999
Number of astrometric reference sources used in recalibration.
recalphotoScat
magnitudes
REAL
4
-999
Photometric scatter relative to reference catalog.
recalNPhotoStars
dimensionless
INT
4
-999
Number of astrometric reference sources used in recalibration.
nAxis1
pixels
SMALLINT
2
-999
Image dimension in x.
nAxis2
pixels
SMALLINT
2
-999
Image dimension in y.
psfModelID
dimensionless
INT
4
-999
PSF model identifier.
psfFWHM
arcsec
REAL
4
-999
Mean PSF full width at half maximum at image center.
psfWidMajor
arcsec
REAL
4
-999
PSF major axis FWHM at image center.
psfWidMinor
arcsec
REAL
4
-999
PSF minor axis FWHM at image center.
psfTheta
degrees
REAL
4
-999
PSF major axis orientation at image center.
momentMajor
arcsec
REAL
4
-999
PSF major axis second moment.
momentMinor
arcsec
REAL
4
-999
PSF minor axis second moment.
momentM2C
arcsec^2
REAL
4
-999
Moment M2C = M_xx - M_yy.
momentM2S
arcsec^2
REAL
4
-999
Moment M2S = 2 * M_xy.
momentM3
arcsec^2
REAL
4
-999
trefoil second moment = sqrt( (M_xxx - 3 * M_xyy)^2 + (3 * M_xxy - M_yyy)^2 ).