Q | arith                                | Arithmetic quantities
S | arith.diff                           | Difference between two quantities described by the same UCD
P | arith.factor                         | Numerical factor
P | arith.grad                           | Gradient
P | arith.rate                           | Rate (per time unit)
S | arith.ratio                          | Ratio between two quantities described by the same UCD
S | arith.squared                        | Squared quantity
S | arith.sum				             | Summed or integrated quantity
S | arith.variation                      | Generic variation of a quantity
Q | arith.zp                             | Zero point
S | em                                   | Electromagnetic spectrum
S | em.IR                                | Infrared part of the spectrum
S | em.IR.J                              | Infrared between 1.0 and 1.5 micron
S | em.IR.H                              | Infrared between 1.5 and 2 micron
S | em.IR.K                              | Infrared between 2 and 3 micron
S | em.IR.3-4um                          | Infrared between 3 and 4 micron
S | em.IR.4-8um                          | Infrared between 4 and 8 micron
S | em.IR.8-15um                         | Infrared between 8 and 15 micron
S | em.IR.15-30um                        | Infrared between 15 and 30 micron
S | em.IR.30-60um                        | Infrared between 30 and 60 micron
S | em.IR.60-100um                       | Infrared between 60 and 100 micron
S | em.IR.NIR                            | Near-Infrared, 1-5 microns
S | em.IR.MIR                            | Medium-Infrared, 5-30 microns
S | em.IR.FIR                            | Far-Infrared, 30-100 microns
S | em.UV                                | Ultraviolet part of the spectrum
S | em.UV.10-50nm                        | Ultraviolet between 10 and 50 nm EUV extreme UV
S | em.UV.50-100nm                       | Ultraviolet between 50 and 100 nm
S | em.UV.100-200nm                      | Ultraviolet between 100 and 200 nm FUV Far UV
S | em.UV.200-300nm                      | Ultraviolet between 200 and 300 nm NUV near UV
S | em.X-ray                             | X-ray part of the spectrum
S | em.X-ray.soft                        | Soft X-ray (0.12 - 2 keV)
S | em.X-ray.medium                      | Medium X-ray (2 - 12 keV)
S | em.X-ray.hard                        | Hard X-ray (12 - 120 keV)
Q | em.bin                               | Channel / instrumental spectral bin coordinate (bin number)
Q | em.energy                            | Energy value in the em frame
Q | em.freq                              | Frequency value in the em frame
Q | em.freq.cutoff                       | cutoff frequency
Q | em.freq.resonance                    | resonance frequency
S | em.gamma                             | Gamma rays part of the spectrum
S | em.gamma.soft                        | Soft gamma ray (120 - 500 keV)
S | em.gamma.hard                        | Hard gamma ray (>500 keV)
S | em.line                              | Designation of major atomic lines
S | em.line.HI                           | 21cm hydrogen line
S | em.line.Lyalpha                      | H-Lyalpha line
S | em.line.Halpha                       | H-alpha line
S | em.line.Hbeta                        | H-beta line
S | em.line.Hgamma                       | H-gamma line
S | em.line.Hdelta                       | H-delta line
S | em.line.Brgamma                      | Bracket gamma line
S | em.line.CO                           | CO radio line, e.g. 12CO(1-0) at 115GHz
S | em.line.OIII                         | [OIII] line whose rest wl is 500.7 nm
S | em.mm                                | Millimetric/submillimetric part of the spectrum
S | em.mm.30-50GHz                       | Millimetric between 30 and 50 GHz
S | em.mm.50-100GHz                      | Millimetric between 50 and 100 GHz
S | em.mm.100-200GHz                     | Millimetric between 100 and 200 GHz
S | em.mm.200-400GHz                     | Millimetric between 200 and 400 GHz
S | em.mm.400-750GHz                     | Millimetric between 400 and 750 GHz
S | em.mm.750-1500GHz                    | Millimetric between 750 and 1500 GHz
S | em.mm.1500-3000GHz                   | Millimetric between 1500 and 3000 GHz
S | em.opt                               | Optical part of the spectrum
S | em.opt.U                             | Optical band between 300 and 400 nm
S | em.opt.B                             | Optical band between 400 and 500 nm
S | em.opt.V                             | Optical band between 500 and 600 nm
S | em.opt.R                             | Optical band between 600 and 750 nm
S | em.opt.I                             | Optical band between 750 and 1000 nm
S | em.pw                                | Plasma waves (trapped in local medium)
S | em.radio                             | Radio part of the spectrum
S | em.radio.20MHz                       | Radio below 20 MHz
S | em.radio.20-100MHz                   | Radio between 20 and 100 MHz
S | em.radio.100-200MHz                  | Radio between 100 and 200 MHz
S | em.radio.200-400MHz                  | Radio between 200 and 400 MHz
S | em.radio.400-750MHz                  | Radio between 400 and 750 MHz
S | em.radio.750-1500MHz                 | Radio between 750 and 1500 MHz
S | em.radio.1500-3000MHz                | Radio between 1500 and 3000 MHz
S | em.radio.3-6GHz                      | Radio between 3 and 6 GHz
S | em.radio.6-12GHz                     | Radio between 6 and 12 GHz
S | em.radio.12-30GHz                    | Radio between 12 and 30 GHz
Q | em.wavenumber                        | Wavenumber value in the em frame
Q | em.wl                                | Wavelength value in the em frame
Q | em.wl.central                        | Central wavelength
Q | em.wl.effective                      | Effective wavelength
Q | instr                                | Instrument
E | instr.background                     | Instrumental background
Q | instr.bandpass                       | Bandpass (e.g.: band name) of instrument
Q | instr.bandwidth                      | Bandwidth of the instrument
Q | instr.baseline                       | Baseline for interferometry
S | instr.beam                           | Beam
Q | instr.calib                          | Calibration parameter
S | instr.det                            | Detector
Q | instr.det.noise                      | Instrument noise
Q | instr.det.psf                        | Point Spread Function
Q | instr.det.qe                         | Quantum efficiency
Q | instr.dispersion                     | Dispersion of a spectrograph
Q | instr.experiment                     | Experiment or group of instruments
S | instr.filter                         | Filter
S | instr.fov                            | Field of view
S | instr.obsty                          | Observatory, satellite, mission
Q | instr.obsty.seeing                   | Seeing
Q | instr.offset                         | Offset angle respect to main direction of observation
Q | instr.order                          | Spectral order in a spectrograph
Q | instr.param                          | Various instrumental parameters
S | instr.pixel                          | Pixel (default size: angular)
S | instr.plate                          | Photographic plate
Q | instr.plate.emulsion                 | Plate emulsion
Q | instr.precision                      | Instrument precision
Q | instr.rmsf                           | Rotation Measure Spread Function
Q | instr.saturation                     | Instrument saturation threshold
Q | instr.scale                          | Instrument scale (for CCD, plate, image)
Q | instr.sensitivity                    | Instrument sensitivity, detection threshold
Q | instr.setup                          | Instrument configuration or setup
Q | instr.skyLevel                       | Sky level
Q | instr.skyTemp                        | Sky temperature
Q | instr.tel                            | Telescope
Q | instr.tel.focalLength                | Telescope focal length
S | instr.voxel                          | Related to a voxel (n-D volume element with n>2)
P | meta                                 | Metadata
P | meta.abstract                        | Abstract (of paper, proposal, etc.)
P | meta.bib                             | Bibliographic reference
P | meta.bib.author                      | Author name
P | meta.bib.bibcode                     | Bibcode
P | meta.bib.fig                         | Figure in a paper
P | meta.bib.journal                     | Journal name
P | meta.bib.page                        | Page number
P | meta.bib.volume                      | Volume number
Q | meta.calibLevel                      | Processing/calibration level
Q | meta.checksum 			             | Numerical signature of digital data
P | meta.code                            | Code or flag
P | meta.code.class                      | Classification code
P | meta.code.error                      | Limit uncertainty error flag
P | meta.code.member                     | Membership code
P | meta.code.mime                       | MIME type
P | meta.code.multip                     | Multiplicity or binarity flag
P | meta.code.qual                       | Quality, precision, reliability flag or code
P | meta.code.status                     | Status code (e.g.: status of a proposal/observation)
P | meta.cryptic                         | Unknown or impossible to understand quantity
P | meta.curation                        | Identity of man/organization responsible for the data
Q | meta.dataset                         | Dataset
Q | meta.email                           | Curation/contact e-mail
S | meta.file                            | File
S | meta.fits                            | FITS standard
P | meta.id                              | Identifier, name or designation
P | meta.id.assoc                        | Identifier of associated counterpart
P | meta.id.CoI                          | Name of Co-Investigator
P | meta.id.cross                        | Cross identification
P | meta.id.parent                       | Identification of parent source
P | meta.id.part                         | Part of identifier, suffix or sub-component
P | meta.id.PI                           | Name of Principal Investigator or Co-PI
S | meta.main                            | Main value of something
S | meta.modelled                        | Quantity was produced by a model
P | meta.note                            | Note or remark (longer than a code or flag)
P | meta.number                          | Number (of things; e.g. nb of object in an image)
S | meta.preview                         | Related to a preview operation for a dataset
Q | meta.query                           | A query posed to an information system or database or a property of it
P | meta.record                          | Record number
P | meta.ref                             | Reference or origin
P | meta.ref.doi                         | DOI identifier (dereferenceable)
Q | meta.ref.ivoid                       | Identifier as recommended  in the IVOA  (dereferenceable)
P | meta.ref.ivorn                       | Identifier defined as IVORN, VO Resource Name (ivo://)  (deprecated)
P | meta.ref.uri                         | URI, universal resource identifier
P | meta.ref.url                         | URL, web address
S | meta.software                        | Software used in generating data
S | meta.table                           | Table or catalogue
P | meta.title                           | Title or explanation
Q | meta.ucd                             | UCD
P | meta.unit                            | Unit
P | meta.version                         | Version
S | obs                                  | Observation
Q | obs.airMass                          | Airmass
S | obs.atmos                            | Atmosphere, atmospheric phenomena affecting an observation
Q | obs.atmos.extinction                 | Atmospheric extinction
Q | obs.atmos.refractAngle               | Atmospheric refraction angle
S | obs.calib                            | Calibration observation
S | obs.calib.flat                       | Related to flat-field calibration observation (dome, sky, ..)
S | obs.calib.dark                       | Related to dark current calibration
S | obs.exposure                         | Exposure
S | obs.field                            | Region covered by the observation
S | obs.image                            | Image
Q | obs.observer                         | Observer, discoverer
S | obs.occult                           | Observation of occultation phenomenon by solar system objects
S | obs.transit                          | Observation of transit phenomenon  : exo-planets
Q | obs.param                            | Various observation or reduction parameter
S | obs.proposal                         | Observation proposal
Q | obs.proposal.cycle                   | Proposal cycle
S | obs.sequence                         | Sequence of observations, exposures or events
E | phot                                 | Photometry
E | phot.antennaTemp                     | Antenna temperature
Q | phot.calib                           | Photometric calibration
C | phot.color                           | Color index or magnitude difference
Q | phot.color.excess                    | Color excess
Q | phot.color.reddFree                  | Dereddened color
E | phot.count                           | Flux expressed in counts
E | phot.fluence                         | Radiant photon energy received by a surface per unit area or irradiance of a surface integrated over time of irradiation
E | phot.flux                            | Photon flux or irradiance
Q | phot.flux.bol                        | Bolometric flux
E | phot.flux.density                    | Flux density (per wl/freq/energy interval)
E | phot.flux.density.sb                 | Flux density surface brightness
E | phot.flux.sb                         | Flux surface brightness
E | phot.limbDark                        | Limb-darkening coefficients
E | phot.mag                             | Photometric magnitude
E | phot.mag.bc                          | Bolometric correction
Q | phot.mag.bol                         | Bolometric magnitude
Q | phot.mag.distMod                     | Distance modulus
E | phot.mag.reddFree                    | Dereddened magnitude
E | phot.mag.sb                          | Surface brightness in magnitude units
E | phot.radiance                        | Radiance as energy flux per solid angle
Q | phys                                 | Physical quantities
Q | phys.SFR                             | Star formation rate
E | phys.absorption                      | Extinction or absorption along the line of sight
Q | phys.absorption.coeff                | Absorption coefficient (e.g. in a spectral line)
Q | phys.absorption.gal                  | Galactic extinction
Q | phys.absorption.opticalDepth         | Optical depth
Q | phys.abund                           | Abundance
Q | phys.abund.Fe                        | Fe/H abundance
Q | phys.abund.X                         | Hydrogen abundance
Q | phys.abund.Y                         | Helium abundance
Q | phys.abund.Z                         | Metallicity abundance
Q | phys.acceleration                    | Acceleration
S | phys.aerosol                         | Relative to aerosol
Q | phys.albedo                          | Albedo or reflectance
Q | phys.angArea                         | Angular area
Q | phys.angMomentum                     | Angular momentum
E | phys.angSize                         | Angular size width diameter dimension extension major minor axis extraction radius
E | phys.angSize.smajAxis                | Angular size extent or extension of semi-major axis
E | phys.angSize.sminAxis                | Angular size extent or extension of semi-minor axis
Q | phys.area                            | Area (in surface, not angular units)
S | phys.atmol                           | Atomic and molecular physics (shared properties)
Q | phys.atmol.branchingRatio            | Branching ratio
S | phys.atmol.collisional               | Related to collisions
Q | phys.atmol.collStrength              | Collisional strength
Q | phys.atmol.configuration             | Configuration
Q | phys.atmol.crossSection              | Atomic / molecular cross-section
Q | phys.atmol.element                   | Element
Q | phys.atmol.excitation                | Atomic molecular excitation parameter
Q | phys.atmol.final                     | Quantity refers to atomic/molecular final/ground state, level, etc.
Q | phys.atmol.initial                   | Quantity refers to atomic/molecular initial state, level, etc.
Q | phys.atmol.ionStage                  | Ion, ionization stage
S | phys.atmol.ionization                | Related to ionization
Q | phys.atmol.lande                     | Lande factor
S | phys.atmol.level                     | Atomic level
Q | phys.atmol.lifetime                  | Lifetime of a level
Q | phys.atmol.lineShift                 | Line shifting coefficient
Q | phys.atmol.number                    | Atomic number Z
Q | phys.atmol.oscStrength               | Oscillator strength
Q | phys.atmol.parity                    | Parity
Q | phys.atmol.qn                        | Quantum number
Q | phys.atmol.radiationType             | Type of radiation characterizing atomic lines (electric dipole/quadrupole, magnetic dipole)
Q | phys.atmol.symmetry                  | Type of nuclear spin symmetry
Q | phys.atmol.sWeight                   | Statistical weight
Q | phys.atmol.sWeight.nuclear           | Statistical weight for nuclear spin states
Q | phys.atmol.term                      | Atomic term
S | phys.atmol.transition                | Transition between states
Q | phys.atmol.transProb                 | Transition probability, Einstein A coefficient
Q | phys.atmol.wOscStrength              | Weighted oscillator strength
Q | phys.atmol.weight                    | Atomic weight
Q | phys.columnDensity                   | Column density
S | phys.composition                     | Quantities related to composition of objects
Q | phys.composition.massLightRatio      | Mass to light ratio
Q | phys.composition.yield               | Mass yield
S | phys.cosmology                       | Related to cosmology
Q | phys.current                         | Electric current
Q | phys.current.density                 | Electric current density
Q | phys.damping                         | Generic damping quantities
Q | phys.density                         | Density (of mass, electron, ...)
Q | phys.density.phaseSpace              | Density in the phase space
Q | phys.dielectric                      | Complex dielectric function
Q | phys.dispMeasure                     | Dispersion measure
S | phys.dust                            | Relative to dust
Q | phys.electCharge                     | Electric charge
V | phys.electField                      | Electric field
S | phys.electron                        | Electron
Q | phys.electron.degen                  | Electron degeneracy parameter
Q | phys.emissMeasure                    | Emission measure
Q | phys.emissivity                      | Emissivity
Q | phys.energy                          | Energy
Q | phys.energy.Gibbs                    | Gibbs (free) energy or free enthalpy   [ G=H –TS ]
Q | phys.energy.Helmholtz                | Helmholtz free energy [ A=U–TS ]
Q | phys.energy.density                  | Energy density
Q | phys.enthalpy                        | Enthalpy  [ H=U+pv ]
Q | phys.entropy                         | Entropy
Q | phys.eos                             | Equation of state
Q | phys.excitParam                      | Excitation parameter U
E | phys.fluence                         | Particle energy received by a surface per unit area and integrated over time
Q | phys.flux                            | Flux or flow of particle, energy, etc.
Q | phys.flux.energy                     | Energy flux, heat flux
Q | phys.gauntFactor                     | Gaunt factor/correction
Q | phys.gravity                         | Gravity
Q | phys.ionizParam                      | Ionization parameter
Q | phys.ionizParam.coll                 | Collisional ionization
Q | phys.ionizParam.rad                  | Radiative ionization
E | phys.luminosity                      | Luminosity
Q | phys.luminosity.fun                  | Luminosity function
E | phys.magAbs                          | Absolute magnitude
Q | phys.magAbs.bol                      | Bolometric absolute magnitude
V | phys.magField                        | Magnetic field
Q | phys.mass                            | Mass
Q | phys.mass.inertiaMomentum            | Momentum of inertia or rotational inertia
Q | phys.mass.loss                       | Mass loss
Q | phys.mol                             | Molecular data
Q | phys.mol.dipole                      | Molecular dipole
Q | phys.mol.dipole.electric             | Molecular electric dipole moment
Q | phys.mol.dipole.magnetic             | Molecular magnetic dipole moment
Q | phys.mol.dissociation                | Molecular dissociation
Q | phys.mol.formationHeat               | Formation heat for molecules
Q | phys.mol.quadrupole                  | Molecular quadrupole
Q | phys.mol.quadrupole.electric         | Molecular electric quadrupole moment
S | phys.mol.rotation                    | Molecular rotation
S | phys.mol.vibration                   | Molecular vibration
S | phys.particle                        | Related to physical particles
S | phys.particle.neutrino               | Related to neutrino
S | phys.particle.neutron                | Related to neutron
S | phys.particle.proton                 | Related to proton
S | phys.particle.alpha                  | Related to alpha particle
S | phys.phaseSpace                      | Related to phase space
E | phys.polarization                    | Polarization degree (or percentage)
Q | phys.polarization.circular           | Circular polarization
Q | phys.polarization.coherency          | Matrix of the correlation between components of an electromagnetic wave
Q | phys.polarization.linear             | Linear polarization
Q | phys.polarization.rotMeasure         | Rotation measure polarization
Q | phys.polarization.stokes             | Stokes polarization
Q | phys.polarization.stokes.I           | Stokes polarization coefficient I
Q | phys.polarization.stokes.Q           | Stokes polarization coefficient Q
Q | phys.polarization.stokes.U           | Stokes polarization coefficient U
Q | phys.polarization.stokes.V           | Stokes polarization coefficient V
Q | phys.potential                       | Potential (electric, gravitational, etc)
Q | phys.pressure                        | Pressure
Q | phys.recombination.coeff             | Recombination coefficient
Q | phys.reflectance                     | Radiance factor (received radiance divided by input radiance)
Q | phys.reflectance.bidirectional       | Bidirectional reflectance
Q | phys.reflectance.bidirectional.df    | Bidirectional reflectance distribution function
Q | phys.reflectance.factor              | Reflectance normalized per direction cosine of incidence angle
Q | phys.refractIndex                    | Refraction index
Q | phys.size                            | Linear size, length (not angular)
Q | phys.size.axisRatio                  | Axis ratio (a/b) or (b/a)
Q | phys.size.diameter                   | Diameter
Q | phys.size.radius                     | Radius
Q | phys.size.smajAxis                   | Linear semi major axis
Q | phys.size.sminAxis                   | Linear semi minor axis
Q | phys.size.smedAxis                   | Linear semi median axis for 3D ellipsoids
Q | phys.temperature                     | Temperature
Q | phys.temperature.effective           | Effective temperature
Q | phys.temperature.electron            | Electron temperature
Q | phys.transmission                    | Transmission (of filter, instrument, ...)
V | phys.veloc                           | Space velocity
Q | phys.veloc.ang                       | Angular velocity
Q | phys.veloc.dispersion                | Velocity dispersion
Q | phys.veloc.escape                    | Escape velocity
Q | phys.veloc.expansion                 | Expansion velocity
Q | phys.veloc.microTurb                 | Microturbulence velocity
Q | phys.veloc.orbital                   | Orbital velocity
Q | phys.veloc.pulsat                    | Pulsational velocity
Q | phys.veloc.rotat                     | Rotational velocity
Q | phys.veloc.transverse                | Transverse / tangential velocity
S | phys.virial                          | Related to virial quantities (mass, radius, ...)
Q | phys.volume                          | Volume (in cubic units)
Q | pos                                  | Position and coordinates
Q | pos.angDistance                      | Angular distance, elongation
Q | pos.angResolution                    | Angular resolution
Q | pos.az                               | Position in alt-azimutal frame
Q | pos.az.alt                           | Alt-azimutal altitude
Q | pos.az.azi                           | Alt-azimutal azimut
Q | pos.az.zd                            | Alt-azimutal zenith distance
Q | pos.azimuth                          | Azimuthal angle in a generic reference plane
S | pos.barycenter                       | Barycenter
S | pos.bodycentric                      | Body-centric related coordinate
S | pos.bodygraphic                      | Body-graphic related coordinate
S | pos.bodyrc                           | Body related coordinates
Q | pos.bodyrc.alt                       | Body related coordinate (altitude on the body)
Q | pos.bodyrc.lat                       | Body related coordinate (latitude on the body)
Q | pos.bodyrc.lon                       | Body related coordinate (longitude on the body)
S | pos.cartesian                        | Cartesian (rectangular) coordinates
Q | pos.cartesian.x                      | Cartesian coordinate along the x-axis
Q | pos.cartesian.y                      | Cartesian coordinate along the y-axis
Q | pos.cartesian.z                      | Cartesian coordinate along the z-axis
S | pos.centroid                         | Related to centroid position
S | pos.cmb                              | Cosmic Microwave Background reference frame
S | pos.cylindrical                      | Related to cylindrical coordinates
Q | pos.cylindrical.azi                  | Azimuthal angle around z-axis (cylindrical coordinates)
Q | pos.cylindrical.r                    | Radial distance from z-axis (cylindrical coordinates)
Q | pos.cylindrical.z                    | Height or altitude from reference plane (cylindrical coordinates)
Q | pos.dirCos                           | Direction cosine
V | pos.distance                         | Linear distance
S | pos.earth                            | Coordinates related to Earth
Q | pos.earth.altitude                   | Altitude, height on Earth  above sea level
Q | pos.earth.lat                        | Latitude on Earth
Q | pos.earth.lon                        | Longitude on Earth
S | pos.ecliptic                         | Ecliptic coordinates
Q | pos.ecliptic.lat                     | Ecliptic latitude
Q | pos.ecliptic.lon                     | Ecliptic longitude
Q | pos.emergenceAng                     | Emergence angle of optical ray on an interface
S | pos.eop                              | Earth orientation parameters
Q | pos.ephem                            | Ephemeris
Q | pos.eq                               | Equatorial coordinates
Q | pos.eq.dec                           | Declination in equatorial coordinates
Q | pos.eq.ha                            | Hour-angle
Q | pos.eq.ra                            | Right ascension in equatorial coordinates
Q | pos.eq.spd                           | South polar distance in equatorial coordinates
S | pos.errorEllipse                     | Positional error ellipse
Q | pos.frame                            | Reference frame used for positions
S | pos.galactic                         | Galactic coordinates
Q | pos.galactic.lat                     | Latitude in galactic coordinates
Q | pos.galactic.lon                     | Longitude in galactic coordinates
S | pos.galactocentric                   | Galactocentric coordinate system
S | pos.geocentric                       | Geocentric coordinate system
Q | pos.healpix                          | Hierarchical Equal Area IsoLatitude Pixelization
S | pos.heliocentric                     | Heliocentric position coordinate (solar system bodies)
Q | pos.HTM                              | Hierarchical Triangular Mesh
Q | pos.incidenceAng                     | Incidence angle of optical ray on an interface
S | pos.lambert                          | Lambert projection
S | pos.lg                               | Local Group reference frame
S | pos.lsr                              | Local Standard of Rest reference frame
Q | pos.lunar                            | Lunar coordinates
Q | pos.lunar.occult                     | Occultation by lunar limb
Q | pos.nutation                         | Nutation (of a body)
Q | pos.outline                          | Set of points outlining a region (contour)
Q | pos.parallax                         | Parallax
Q | pos.parallax.dyn                     | Dynamical parallax
Q | pos.parallax.phot                    | Photometric parallaxes
Q | pos.parallax.spect                   | Spectroscopic parallax
Q | pos.parallax.trig                    | Trigonometric parallax
Q | pos.phaseAng                         | Phase angle, e.g. elongation of earth from sun as seen from a third celestial object
V | pos.pm                               | Proper motion
Q | pos.posAng                           | Position angle of a given vector
V | pos.precess                          | Precession (in equatorial coordinates)
Q | pos.resolution                       | Spatial linear resolution (not angular)
S | pos.spherical                        | Related to spherical coordinates
Q | pos.spherical.azi                    | Azimuthal angle (spherical coordinates)
Q | pos.spherical.colat                  | Polar or Colatitude angle (spherical coordinates)
Q | pos.spherical.r                      | Radial distance or radius (spherical coordinates)
S | pos.supergalactic                    | Supergalactic coordinates
Q | pos.supergalactic.lat                | Latitude in supergalactic coordinates
Q | pos.supergalactic.lon                | Longitude in supergalactic coordinates
P | pos.wcs                              | WCS keywords
P | pos.wcs.cdmatrix                     | WCS CDMATRIX
P | pos.wcs.crpix                        | WCS CRPIX
P | pos.wcs.crval                        | WCS CRVAL
P | pos.wcs.ctype                        | WCS CTYPE
P | pos.wcs.naxes                        | WCS NAXES
P | pos.wcs.naxis                        | WCS NAXIS
P | pos.wcs.scale                        | WCS scale or scale of an image
Q | spect                                | Spectroscopy
Q | spect.binSize                        | Spectral bin size
S | spect.continuum                      | Continuum spectrum
Q | spect.dopplerParam                   | Doppler parameter b
E | spect.dopplerVeloc                   | Radial velocity, derived from the shift of some spectral feature
E | spect.dopplerVeloc.opt               | Radial velocity derived from a wavelength shift using the optical convention
E | spect.dopplerVeloc.radio             | Radial velocity derived from a frequency shift using the radio convention
E | spect.index                          | Spectral index
S | spect.line                           | Spectral line
E | spect.line.asymmetry                 | Line asymmetry
E | spect.line.broad                     | Spectral line broadening
Q | spect.line.broad.Stark               | Stark line broadening coefficient
E | spect.line.broad.Zeeman              | Zeeman broadening
E | spect.line.eqWidth                   | Line equivalent width
E | spect.line.intensity                 | Line intensity
E | spect.line.profile                   | Line profile
Q | spect.line.strength                  | Spectral line strength S
E | spect.line.width                     | Spectral line full width half maximum
Q | spect.resolution                     | Spectral (or velocity) resolution
S | src                                  | Observed source viewed on the sky
S | src.calib                            | Calibration source
S | src.calib.guideStar                  | Guide star
Q | src.class                            | Source classification (star, galaxy, cluster, comet, asteroid )
Q | src.class.color                      | Color classification
Q | src.class.distance                   | Distance class e.g. Abell
Q | src.class.luminosity                 | Luminosity class
Q | src.class.richness                   | Richness class e.g. Abell
Q | src.class.starGalaxy                 | Star/galaxy discriminator, stellarity index
Q | src.class.struct                     | Structure classification e.g. Bautz-Morgan
Q | src.density                          | Density of sources
Q | src.ellipticity                      | Source ellipticity
Q | src.impactParam                      | Impact parameter
Q | src.morph                            | Morphology structure
Q | src.morph.param                      | Morphological parameter
Q | src.morph.scLength                   | Scale length for a galactic component (disc or bulge)
Q | src.morph.type                       | Hubble morphological type (galaxies)
S | src.net                              | Qualifier indicating that a quantity (e.g. flux) is background subtracted rather than total
Q | src.orbital                          | Orbital parameters
Q | src.orbital.eccentricity             | Orbit eccentricity
Q | src.orbital.inclination              | Orbit inclination
Q | src.orbital.meanAnomaly              | Orbit mean anomaly
Q | src.orbital.meanMotion               | Mean motion
Q | src.orbital.node                     | Ascending node
Q | src.orbital.periastron               | Periastron
Q | src.orbital.Tisserand                | Tisserand parameter (generic)
Q | src.orbital.TissJ                    | Tisserand parameter with respect to Jupiter
Q | src.redshift                         | Redshift
Q | src.redshift.phot                    | Photometric redshift
Q | src.sample                           | Sample
Q | src.spType                           | Spectral type MK
Q | src.var                              | Variability of source
E | src.var.amplitude                    | Amplitude of variation
Q | src.var.index                        | Variability index
Q | src.var.pulse                        | Pulse
Q | stat                                 | Statistical parameters
Q | stat.asymmetry                       | Measure of asymmetry
P | stat.correlation                     | Correlation between two parameters
P | stat.covariance                      | Covariance between two parameters
P | stat.error                           | Statistical error
P | stat.error.sys                       | Systematic error
Q | stat.filling                         | Filling factor (volume, time, ...)
Q | stat.fit                             | Fit
P | stat.fit.chi2                        | Chi2
P | stat.fit.dof                         | Degrees of freedom
P | stat.fit.goodness                    | Goodness or significance of fit
S | stat.fit.omc                         | Observed minus computed
Q | stat.fit.param                       | Parameter of fit
P | stat.fit.residual                    | Residual fit
Q | stat.Fourier                         | Fourier coefficient
Q | stat.Fourier.amplitude               | Amplitude of Fourier coefficient
S | stat.fwhm                            | Full width at half maximum
S | stat.interval                        | Generic interval between two limits (defined as a pair of values)
P | stat.likelihood                      | Likelihood
S | stat.max                             | Maximum or upper limit
S | stat.mean                            | Mean, average value
S | stat.median                          | Median value
S | stat.min                             | Minimum or lowest limit
Q | stat.param                           | Parameter
Q | stat.probability                     | Probability
P | stat.rank                            | Rank or order in list of sorted values
P | stat.rms                             | Root mean square as square root of sum of squared values or quadratic mean
P | stat.snr                             | Signal to noise ratio
P | stat.stdev                           | Standard deviation as the square root of the variance
S | stat.uncalib                         | Qualifier of a generic uncalibrated quantity
Q | stat.value                           | Miscellaneous value
P | stat.variance                        | Variance
P | stat.weight                          | Statistical weight
Q | time                                 | Time, generic quantity in units of time or date
Q | time.age                             | Age
Q | time.creation                        | Creation time/date (of dataset, file, catalogue,...)
Q | time.crossing                        | Crossing time
Q | time.duration                        | Interval of time describing the duration of a generic event or phenomenon
Q | time.end                             | End time/date of a generic event
Q | time.epoch                           | Instant of time related to a generic event (epoch, date, Julian date, time stamp/tag,...)
Q | time.equinox                         | Equinox
Q | time.interval                        | Time interval, time-bin, time elapsed between two events, not the duration of an event
Q | time.lifetime                        | Lifetime
Q | time.period                          | Period, interval of time between the recurrence of phases in a periodic phenomenon
Q | time.period.revolution               | Period of revolution of a body around a primary one (similar to year)
Q | time.period.rotation                 | Period of rotation of a body around its axis (similar to day)
Q | time.phase                           | Phase, position within a period
Q | time.processing                      | A time/date associated with the processing of data
Q | time.publiYear                       | Publication year
Q | time.relax                           | Relaxation time
Q | time.release                         | The time/date data is available to the public
Q | time.resolution                      | Time resolution
Q | time.scale                           | Timescale
Q | time.start                           | Start time/date of generic event
