wiki:CommonVocabulary

Version 1 (modified by jbecla, 11 years ago) (diff)

init version, not finished

Common Vocabulary

LSST Data Management

used name unit type full name comments
ra degrees int64 right ascention
decl degrees int64 declination dec is a reserved word in most DBMSes
equinox int32 equinox of World Coordinate System
url - string logical url of the corresponding FITS file
ctype1 string(20) Coordinate projection type, axis 1
ctype2 string(20) Coordinate projection type, axis 2
crpix1 float Coordinate reference pixel, axis 1
crpix2 float Coordinate reference pixel, axis 2
crval1 double Coordinate value 1 @reference pixel
crval2 double Coordinate value 2 @reference pixel
cunit1 varchar(10) X axis units
cunit2 varchar(10) Y axis units
cdelt1 float Obsolete by cd_xx terms?
cdelt2 float Obsolete by cd_xx terms?
cd11 float First derivative of coordinate 1 w.r.t. axis 1
cd21 float First derivative of coordinate 2 w.r.t. axis 1
cd12 float First derivative of coordinate 1 w.r.t. axis 2
cd22 float First derivative of coordinate 2 w.r.t. axis 2
dateObs datetime Date/Time? of observation start (UTC)
taiObs datetime TAI-OBS = UTC + offset. Offset = 32 s from 1/1/1999 to 1/1/2006, = 33 s after 1/1/2006
mjdObs double MJD of observation start
expTime float Duration of exposure
darkTime float Total elapsed time from exposure start to end of read
zd float Zenith distance at observation mid-point
airmass float Airmass value for the Amp reference pixel preferably center, but not guaranteed)
binX int16 binning in X-coordinate
binY int16 binning in Y-coordinate
sizeX int16 Size of the image in X-direction (along rows; binned pixels) Ignores overscan but includes regions that may be considered outside of the data portion of the image
sizeY int16 Size of the image in Y-direction (along columns; binned pixels) Ignores overscan but includes regions that may be considered outside of the data portion of the image
tai double time of shutter open (international atomic time)
texp float Exposure time for this particular Amplifier
bias float Bias level for the calibrated image
gain float Gain value for the amplifier
rdNoise electrons float Read noise value for this AmpExposure?
telAngle degrees float Orientation angle of the telescope w.r.t sky This is different from camera orientation w.r.t sky (encapsulated in WCS), since telescope is on alt-az mount
az degrees float Azimuth of observation preferably at center of exposure at center of image and including refraction correction, but none of this is guaranteed
alt degrees float Altitude of observation preferably at center of observation at center of image and including refraction correction, but none of this is guaranteed
zpt double Photometric zero point magnitude
sky float The average sky level in the frame
skySig float Sigma of distribution of sky values
psf_nstar int32 Number of stars used for PSF measurement
psf_apcorr float Photometric error due to imperfect PSF model (aperture correction)
psf_sigma1 float Inner Gaussian sigma for the composite fit (XXX)
psf_sigma2 float Outer Gaussian sigma for the composite fit (XXX)
psf_b float Ratio of inner PSF to outer PSF (XXX)
psf_b_2G float Ratio of Gaussian 2 to Gaussian 1 at origin (XXX)
psf_p0 float The value of the power law at the origin (XXX)
psf_beta float The slope of the power law (XXX)
psf_sigmap float Width parameter for the power law (XXX)
psf_nprof float Number of profile bins (XXX)
fwhm float Effective PSF width
sigma_x float
sigma_y float
posAngle float psf related
peak float psf related
x0 float psf related
x1 float psf related
radesys string(5) Type of WCS used. Obsolete in ICRS
equinox float Equinox of the WCS. Obsolete in ICRS
uMagnitude double magnitude (weighted average) for u filter
uPetroMag double petrosian magnitude for u filter
uApMag double aperture magnitude for u filter
uIxx float Adaptive second moment for u filter
uIyy float Adaptive second moment for u filter
uIxy float Adaptive second moment for u filter
uErrA arcsec float Large dimension of the position error ellipse, assuming gaussian scatter for u filter
uErrB arcsec float Small dimension of the position error ellipse, assuming gaussian scatter for u filter
uErrTheta degrees float Orientation of the position error ellipse For u filter
uAmplitude float amplitude for u filter
uPeriod float period of magnitude variations for u filter
primaryPeriod float Average period across all filters
uTimescale days float timescale of flux variations for u filter
uNumObs int32 number of measurements in the lightcurve for u filter
uVarProb % int16 probability of variability. 100% = variable object for u filter
mops related
a float semi-major axis of the orbit (AU)
incl degrees float inclination of the orbit
e float eccentricity of the orbit
periTAI float TAI of the perihelion passage (comets)
periDist float Perihelion distance (AU)
omega float argument of perihelion
node float longitude of the ascending node
meanAnom float mean anomaly of the orbit
qual float measure of the accuracy of the derived orbit, classification, etc. can be more than one. Placeholder
various ids
alertId int32 id of an Alert
amplifierId int16 id of amplifier
ccExposureId int64 if of CCD exposure
filterId int8 id of LSST filter
objectId int64 id of an Astronomical Object
movingObjectId int64 id of a Moving Object
visitId int32 id of a Visit

unit for errors the same as the unit of column, for which the error is defined