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I/325
  Radio-optical reference frame link (Zacharias+ 2013)
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1.I/325/icrf-u2(c)Results from UCAC2-type reductions of ICRF optical counterparts (sample in table 4 of paper) (666 rows)
2.I/325/icrf-u4(c)Results from UCAC4-type reductions of ICRF optical counterparts (sample in table 5 of paper) (682 rows)
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Query by Constraints constraints help applied on Columns (Output Order: + - )
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Column  Constraint Explain   (UCD)
  (ALL)recno  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)
   (ALL)RAJ2000 "h:m:s" (i) Right Ascension ICRS (pos.eq.ra;meta.main)
   (ALL)DEJ2000 "d:m:s" (i) Declination ICRS (pos.eq.dec;meta.main)
   (ALL)Dist mas [0/1821] Distance between the optical and radio positions (pos.angDistance)
   (ALL)dRA* mas Distance(optical-radio) in RA*cos(Dec) (pos.eq.ra;arith.diff)
   (ALL)dDec mas Distance(optical-radio) in Dec (pos.eq.dec)
   (ALL)eRA mas [4/250] total, formal error of optical position (RA*cos(Dec)) (stat.error;spect.dopplerVeloc.opt;em.opt)
   (ALL)eDE mas [4/250] total, formal error of optical position (Dec) (stat.error;spect.dopplerVeloc.opt;em.opt)
   (ALL)sRA  ratio dRA*/eRA (position difference in RA in σs) (stat.fit.goodness)
   (ALL)sDE  ratio dDE/eDE (position difference in Dec in σs) (stat.fit.goodness)
   (ALL)eRad mas (n) error of radio position (per coordinate) (stat.error;spect.dopplerVeloc.radio;em.radio)

ALL cols
    
(n) indicates a possible blank or NULL column(i)indexed column
   (ALL)Nccd  number of deep CCD exposures used (meta.number)
   (ALL)Nr*  average number of reference stars per deep exposure used (meta.number)
   (ALL)Nrx  average number of reference stars excluded (meta.number)
   (ALL)err  mean "plate" solution error of individual deep CCD exposures (stat.error)
   (ALL)S/N   [1/1639] Approximate signal/noise ratio of target on individual deep CCD (stat.snr;instr.det)
   (ALL)mag mag (n) Optical brightness from LQAC-2 (J/A+A/537/A99) (phot.mag;em.opt)
   (ALL)z  (n) [0/5] Redshift from LQAC-2 (J/A+A/537/A99) (src.redshift)
   (ALL)T   [0/3] Object type: 0=unknown, 1=AGN, 2=BL-Lac, 3=QSO (from Veron's 13th ed. (VII/258) (src.class)
   (ALL)S  (n) [0.8/7.2] Radio X-band (8-12GHz) structure index from Bordeaux database: 1=very good, 2=good, 3=use with caution, 4=unacceptable (meta.code.qual)
   (ALL)U   [2/4] UCAC-type reductions (2 or 4) (meta.id;meta.dataset)
   (ALL)Rname (char) B1950 coordinate based name of target (meta.id;meta.main)
   (ALL)R  (n)Number of results for this source with UCAC2- and UCAC4-type reductions (meta.number)
   (ALL)Run (char) [abo-zJ] Code of deep CCD observing run (Note 1)   (meta.code;instr.det)

ALL cols
    
(n) indicates a possible blank or NULL column(i)indexed column
   (ALL)n_Run (char) [rc] Type of target: r=regular target, c=also used as calibration field (meta.note)
   (ALL)Q (char) [ufplgn] Quality letter of optical image (Note 2)   (meta.code.qual;spect.dopplerVeloc.opt;em.opt)
   (ALL)M  (n)Existence in Vérons' catalogue (VII/258) and/or LQAC-2 (J/A+A/537/A99) within 3arcsec (meta.ref.url)
   (ALL)Notes (char) Remarks; if a double the separation (pixel) and flux ratio (source/companion) is given (meta.number)
   (ALL)SimbadName (char) Designation understandable by the Simbad data-base (meta.id)

ALL cols
    
(n) indicates a possible blank or NULL column(i)indexed column
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