J/A+A/375/661ivo://CDS.VizieR/J/A+A/375/661doi:10.26093/cds/vizier.33750661CDSGontier A.-M.Le Bail K.Feissel M.Eubanks T.M.2018-01-10T11:47:45Z2001-09-16T13:02:59ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frquasarsvery-long-baseline-interferometryastrometryastronomical-reference-materialsThe file table 2 gives the results of various tests and noise measurements performed on time serie of extragalactic radio source coordinates. Systematic and random behaviours in time serie of individual determinations of cooordinates for 283 sources over 1987-1999 are investigated. The random variability of the source coordinates is characterized by the {chi}^2^ test (Bevington, 1969, p.187) and the "goodness of fit (gof)" (Bevington, 1969, p.188). The Allan variance method (Allan, 1966, Proc. IEEE, vol. 54, 221) is used to investigate spectral characteristics of the time series. The source structure index (Fey & Charlot, 1997ApJS..111...95F, 2000, Cat. <J/ApJS/128/17>) qualifies the level of position disturbance expected at the date of the map (1 for the less disturbed, 4 for the most disturbed). The estimation of "linear rates" in the coordinates is a qualifier of the systematic parts of the source instability. This table contains the 283 best observed sources and is divided in three parts, with the left hand side giving general information and counts, the middle part giving statistics in the source local frame, and the right hand side giving statistics in the equatorial frame.2001A&A...375..661Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/375/661CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/110/880 : Radio reference frame (Johnston+ 1995)J/ApJS/128/17 : VLBA obs. of radio reference frame sources. III. (Fey+, 2000)I/171 : Astrographic Catalog Reference Stars (ACRS) (Corbin+ 1991)I/172 : International Reference Stars (IRS) (Corbin 1991)I/246 : The ACT Reference Catalog (Urban+ 1997)I/251 : VLBI International Celestial Reference Frame (ICRF) (Ma+, 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/375/661https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/375/661http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/375/661https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/375/661https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/375/661http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/375/661GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/375/661/table2 (Observational and statistical characteristics of the sources over 1987-1999, in the local and equatorial coordinate systems)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/375/661/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/375/661/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/375/661/table2?GETtext/xml+votable180.050000true1.55788694-6.393148610.0055555555555555566/60 110 124 180 304 421 532 556 579 700 911 1154 1233 1546 1622 1701-1702 1782 2143 2245 2397 2600 2836 3024 3096 3675 3820 3886 4027 4054 4436 4448 4572 4695-4696 4770 4820 5371 5423 5448 5458 5546 5693 5766-5767 5848 6033 6067 6164 6252 6377 6496 6507 6548 6641 6751 6853 6948 6996 7148 7181 7296 7346 7389 7472 7570 7606 7623 7653 7857 7896 8031 8057 8112 8123 8299 8345 8487 8717 8858 9442 9460 9612 9632-9633 9676 9688 9723 9813 10163 10228 10422 10983 11094 11216 11430 11461 11639 11715 11845 11880 12047 12173 12218 12475 12580 12599 13156 13352 13496 13927 14338 14520 14842 15023 15286 15494 15936 16027 16059 16093 16113 16281 16301-16302 17351 17579 17734 17791 17857 18037 18084 18242 18271 18378 18624 18661 19101 19166 19190 19370 19523 20657 21012 21163 21758 21924 21935 21960 22396 22950 22965 23099 23127 23323 23478 23691 23882 24123 24335 24453 24571 24608 24845 25016 25196 25428 25503 25630 25742 25864 25990 26083 26115 26131 26292 26301 26303 26363 26966 26983 27060 27310 27423 27583 27765 27909 28208 28383 28479 28492 28628 29016 29218 29570 29675 29714 29795 31176 31190 31211 31334 31355 31430 31451 31529 31664 31857 31894 32311 32764 33043 33549 33560 33825 34123 34264 34428 34517 35079 35440 36155 36417 36554 36785 36941 37385 37994 38277 38579 40060 40344 40692 41072 42901 43366 43822 43936 44034 44043 44147 44247 44776 44805 44908 45110 45614 46055 46764 47268 47540 47941 48023 48123 48595 48610 48798 48965https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/375/661?format=asciiRadiodefaultJ/A+A/375/661/table2Observational and statistical characteristics of the sources over 1987-1999, in the local and equatorial coordinate systemsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIERSIERS designation of the radio sourcemeta.id;meta.maincharn_IERS[dcon] ICRF status of the source (1)meta.notecharSimbadSimbad column added by the CDSmeta.refcharNsesNumber of sessions with more than two observations of the source.meta.numberintNyearsNumber of years with observations of the source in at least six sessions.meta.numberintAngle? Angle of the axis of maximum local variability with the declination axis.degpos.posAngintnullablel_gofPosLimit flag on gofPosmeta.code.errorchargofPosGoodness of fit of the yearly coordinate in the direction of maximum local variability.stat.fit.goodnessfloate_Pos? Allan standard error of yearly coordinate in the direction of maximum local variabilitystat.errorfloatnullableIndex? Fey & Charlot (1997ApJS..111...95F and 2000, Cat. <J/ApJS/128/17>) source structure indexmeta.code;src.morphintnullableEpIndex? Epoch of source structure indexyrtime.epochintnullableNoise[WF] Spectral type of noise in the direction of maximum local variability: White noise (W) or Flicker noise (F).meta.notecharRate? Rate of apparent motion in the direction of maximum local variabilitymas/yrphys.veloc.angfloatnullablee_Rate? rms uncertainty on Ratemas/yrstat.errorfloatnullablen_2_RA[#] # marks poor estimatesmeta.notechar2_RA? {chi}^2^ of individual right ascensionsstat.fit.chi2floatnullablel_gof2_RALimit flag on gof2_RAmeta.code.errorchargof2_RAGoodness of fit of yearly right ascensionsstat.fit.goodnessfloate_RAcosDE? Allan standard error of yearly RAcosDEstat.errorfloatnullablen_2_DE[#] # marks poor estimatesmeta.notechar2_DE? {chi}^2^ of individual declinationsstat.fit.chi2floatnullablel_gof2_RELimit flag on gof2_REmeta.code.errorchargof2_REGoodness of fit of yearly declinationsstat.fit.goodnessfloate_DE? Allan standard error of yearly declinationsstat.errorfloatnullable_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullable