J/A+A/553/A122ivo://CDS.VizieR/J/A+A/553/A122doi:10.26093/cds/vizier.35530122CDSLambert S.2017-12-07T07:27:02Z2013-12-11T13:07:16ZCDS support team

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

cds-question@unistra.frastrometryvery-long-baseline-interferometryI assess the astrometric stability of the 295 defining sources of the current best realization of the International Celestial Reference System (ICRS): the second realization of the International Celestial Reference Frame (ICRF2), constructed and published in 2009 after the analysis of millions of VLBI observations at 2 and 8 GHz between 1979.6 and 2009.2. I also assess the time evolution of the ICRF2 axis stability. I derived coordinate time series of hundreds of quasars monitored by the regular geodetic VLBI program of the International VLBI Service for Geodesy and Astrometry (IVS). The axis stability was studied by constructing annual reference frames based on the ICRF2 defining sources. The time variable frame stability was obtained by computing the deformation parameters that lead from one frame to the next. I show that, although the astrometric stability of some of the ICRF2 defining sources has slightly degraded since 2009.2, the ensemble still constitutes a very stable reference frame. The current estimation of the axis stability over 1979.6-2013.1 remains at the same level as the one estimated over 1979.6-2009.2, i.e., on the order of 20uas for each axis.2013A&A...553A.122Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/553/A122CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/323 : International Celestial Reference Frame 2, ICRF2 (Ma+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/553/A122https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/553/A122http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/553/A122https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/553/A122https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/553/A122http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/553/A122GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/553/A122/table1 (Stability due to post-ICRF2 observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/553/A122/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/553/A122/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/553/A122/table1?GETtext/xml+votable180.050000true1.1485647-47.60544560.0055555555555555566/110 304 376 438 532 911 991 1084-1085 1233 1509 1702 2143 2158 2531 2710 2721 2836 2867 3024 3096 3316 3820 3882 4054 4436 4695 4754 4820 5154 5306 5353 5423 5448 5458 5546 5657 5766 5848 6033 6164 6167 6448 6507 6548 6641 6853 6948 6976 7472 7570 7709 7896 8057 8112 8199 8207 8299 8615 8729 8805 9204 9232 9248 9545 9632 9676 9688 9714 9906 10163 10228 10249 10422 10548 10798 10803 11216 11279 11430 11461 11715 11880 12173 12218 12301 12475 12505 12580 12599 13156 13352 14348 14820 14842 14854 15023 15286 15819 16027 16049 16057 16298 16444 16592 16720 17188 17215 17516 17579 17734 17857 17909 18084 18378 18624 18661 18907 19088 19271 19523 19567 19831 20144 20476 20610 20657 20935 21121 21564 21924 21935 21960 21968 21990 22396 22433 22501 22658 22917 22993 23121 23127 23383 23416 23786 23805 23882 24099 24123 24257 24335 24453 24571 24608 24845 25016 25196 25255 25501 25503 25630 25864 25990 26115 26303 26363 26946 26983 27060 27322 27433 27446 27466 27909 28208 28339 28383 28454 28479 28517 29016 29218 29384 29570 29675 29714 31176 31334 31355 31430 31451 31529 31664 31894 31986 32311 32325 32660 32764 32841 32916 33471 33549 33560 33570 33626 33816 33825 33827 33829 33862 34038 34086 34099 34123 34428 34461 34517 34931 35370 35432 35440 36005 36100 36188 37190 37205 37269 37994 38416 38579 38663 38763 39848 40344 40527 40766 41033 41043 41262 41275 41335 41374 41426 41511 41543 41730 42046 42883 42980 43085 43366 43399 43822 44034 44147 44661 44776 44899 44908 45178 45393 45409 45614 45621 45795 46055 46214 46251 46310 46337 46342 46373 46448 46721 46764 46868 46887 46921 46964 47106 47151 47268 47534 47540 47585 47747 48023 48123 48610 48798 48846https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/553/A122?format=asciiRadiodefaultJ/A+A/553/A122/table1Stability due to post-ICRF2 observationsSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIVSIVS name (HHMM+DDd, B1950)meta.id;meta.maincharNses1Number of sessions over ICRF2 time span (1979.6-2009.2)meta.numberintStab1Stability over ICRF2 time span (1979.6-2009.2)masstat.variancefloatNses2Number of sessions over the full time span (1979.6-2013.1)meta.numberintStab2Stability over the full time span (1979.6-2013.1)masstat.variancefloat_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main