C | src.class |object classification (type) 
J | pos.eq; meta.main |J2000 (or Equinox) coordinates Expressed in decimal degrees 
J.E | pos.errorellipse |Error Ellipse on J position 
J.Q | meta.code.qual; pos.eq |Position Quality(if not in J.E)
J.R | meta.ref; pos.eq |Position Reference (if not in J.E)
Q | pos.eq; meta.main |Coordinates at Equinox (2000 by default)
P | pos.pm | Proper motions (stars)
P.Q | meta.code.qual; pos.pm |Proper Motion Quality(if not in P)
P.R | meta.ref; pos.pm |Proper Motion Reference (if not in P)
Ep | time.epoch |Epoch of position (J or Q)
M.B | phot.mag; em.opt.B |Blue magnitude 
M.U | phot.mag; em.opt.U |Ultraviolet magnitude 
M.V | phot.mag; em.opt.V |Visual magnitude 
M.R | phot.mag; em.opt.R |Red magnitude 
M.I | phot.mag; em.opt.I |Infra-red (0.8µ) magnitude 
M.J | phot.mag; em.IR.J |Infrared magnitude 
M.H | phot.mag; em.IR.H |Infrared magnitude 
M.K | phot.mag; em.IR.K |Infrared magnitude 
M.B-V | phot.color; em.opt.B; em.opt.V | Color index 
M*Q | meta.code.qual; phot.mag |Quality for all magnitudes 
M*R | meta.ref; phot.mag |Reference for all magnitudes
M.u | phot.mag; em.opt.U |SDSS (Sloan) ultraviolet magnitude 
M.g | phot.mag; em.opt.V |SDSS (Sloan) green magnitude 
M.r | phot.mag; em.opt.R |SDSS (Sloan) red magnitude 
M.i | phot.mag; em.opt.I |SDSS (Sloan) infrared magnitude 
M.z | phot.mag; em.opt.I |SDSS (Sloan) infrared magnitude 
S | src.spType |Spectral class (stars) 
T | src.morph.type |Morphological class (galaxies) 
D | phys.angSize; src |Dimensions (galaxies) 
X | pos.parallax |Parallax (mas) 
X.Q | meta.code.qual; pos.parallax |Parallax Quality 
X.R | meta.ref; pos.parallax |Parallax Bibcode 
V | spect.dopplerVeloc |Velocity
V.Q | meta.code.qual; spect.dopplerVeloc |Velocity Quality 
V.R | meta.code.qual; spect.dopplerVeloc |Velocity Bibcode 
I | meta.id; src |Identification (alias) 
I.0 | meta.id; meta.main |Selected identification 
O.cat | |Observations 
B | meta.bib.bibcode |Bibliographical code 
R.R | meta.bib.bibcode |Bibliographical code 
R.A | meta.bib.author |Authors 
R.J | meta.bib.journal |Journal, vol., page 
R.T | meta.bib |Title (of a paper) 
R.E | meta.note |Erratum 
R.C | meta.note |Comment