J/MNRAS/466/1567ivo://CDS.VizieR/J/MNRAS/466/1567doi:10.26093/cds/vizier.74661567CDSLiu N.Liu J.-C.Zhu Z.2024-08-17T20:17:38Z2019-11-27T14:20:57ZCDS support team

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

cds-question@unistra.froptical-observationcatalogsastrometryvery-long-baseline-interferometryWe aim to evaluate the possibility of improving the International Celestial Reference System realization starting from the ICRF2 catalogue by investigating the coordinate time series of radio sources observed by the very long baseline interferometry between 1979 and 2016. Sources with long observational history are selected as the candidates and the least-squares fits with special handling of the weights are performed to derive the linear drifts of the source coordinates. Then the sources are sorted, based on the normalized linear drift (i) over the whole sky, and (ii) in four homolographic areas divided by declinations. The axial stability of the reference system and sky distribution defined by the selected sources are evaluated, which are acted as the criterion for the final source lists. With our improved source selection scheme, two groups of sources are proposed and considered suitable for defining a more stable and homogeneous celestial reference system compared to the second version of the current International Celestial Reference Frame (ICRF2). The number of sources in the final lists are 323 and 294, respectively, and the global rotations of the axes derived from apparent motion of the sources are about two times better th2017MNRAS.466.1567Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/466/1567CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/466/1567https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/466/1567http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/466/1567https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/466/1567https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/466/1567http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/466/1567GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/466/1567/table3 (Time-series statistical information of sources in Sou323)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/466/1567/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/466/1567/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/466/1567/table3?GETtext/xml+votable180.050000true248.13291782.5377780.0055555555555555566/18 60 80 110 304 307 421 438 583 700 839 1084 1154 1233 1509 1584 1616 1622 1702 2098 2143 2214 2414 2564 2710 2721 2867 3024 3096 3316 3882 4054 4448 4770 4964 5139 5154 5163 5200 5306 5353 5371 5546 5597 5657 5693 5766 5817 6193 6219 6507 6790 6923 6976 7091 7148 7181 7371 7389 7570 7851 7857 8031 8057 8112 8123 8299 8345 8487 8615 8729 8805 8948 9003 9232 9258 9460 9545 9612 9618 9681 9688 9906 9976 10078 10163 10170 10228 10352 10466 10474 10548 10798 10983 11037 11094 11116 11279 11430 11715 11880 12218 12241 12475 12505 12547 12580 12599 12604 12844 12851 13156 13230 13485 13572 13693 13722 13769 13792 14150 14348 14737 15036 15286 15852 16049 16057 16059 16261 16281 16301 16592 16676 16720 16962 17019 17110 17215 17516 17541 17857 17909 18037 18214 18242 18271 18545 18561 18624 18718 18755 19088 19166 19197 19223 19271 19370 19398 19436 19523 19622 19743 19831 19867 19882 19890 19970 20213 20468 20888 20935 21163 21358 21437 21758 21768 21924 21960 21972 22363 22658-22659 23099 23127 23478 23761 23786 24123 24257 24346 24453 24568 24809 24845 24941 25016 25036 25256 25677 25742 25864 26115 26363 26550 26946 26983 27060 27310 27436 27466 27773 27909 27926 28042 28167 28208 28339 28383 28454 28463 28492 28628 29218 29384 29675 29714 30857 31355 31430 31666 31894 31986 32325 32594 32660 32764 32841 33471 33570 33626 33684 33816 33829 33862 34013 34099 34210 34264 34571-34572 34699 35281 35294 35651 35786 35801 36100 36151 36155 36188 36554 37474 37480 38189 38277 38416 38734 39377 39577 39672 39848 40762 41043 41059 41262 41275 41335 41426 41511 42046 42853 42883 42901 42980 43085 43822 44247 44310 44555 44614 44661 44724 44776 44805 44832 44899 45011 45196 45393 45614 45621 45795 46055 46251 46310 46337 46373 46721 46868 47014 47016 47106 47151 47747 48023 48123 48320 48362 48595 48798 48985https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/466/1567?format=asciiOpticalRadiodefaultJ/MNRAS/466/1567/table3Time-series statistical information of sources in Sou323recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintICRFICRF designation (JHHMMSS.s+DDMMSS)meta.id;meta.maincharIERSIERS source name (HHMM+DDd, B1950)meta.idcharpm/e_pmRatio of proper motion on proper motion errorstat.fit.omcfloatdpmRA*Liner drift in pmRA*cosDEuarcsec/yrstat.stdev;pos.pm;pos.eq.rafloatdpmDELiner drift in pmDEuarcsec/yrstat.stdev;pos.pm;pos.eq.decfloatWdevRA*Weighted standard deviation in RA*cosDEmasstat.stdev;pos.eq.decfloatWdevDEWeighted standard deviation in DEmasstat.stdev;pos.eq.decfloatWAdevRA*Weighted Allan deviation in RA*cosDEmasstat.stdev;pos.eq.decfloatWAdevDEWeighted Allan deviation in DEmasstat.stdev;pos.eq.decfloatTobsObservation spanyrtime.intervalfloatNsesNumber of seasonsmeta.numberintSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight ascension (derived from ICRF) for Eq=J2000degpos.eq.ra;meta.main_DEDeclination (derived from ICRF) for Eq=J2000degpos.eq.dec;meta.main