J/A+A/631/A145ivo://CDS.VizieR/J/A+A/631/A145doi:10.26093/cds/vizier.36310145CDSDamljanovic G.Taris F.2019-12-31T08:39:24Z2019-11-08T09:15:18ZCDS support team

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

cds-question@unistra.frastrometryproper-motionsThe second solution of the Gaia catalog, which has been available since April 2018, plays an important role in the realization of the future Gaia reference frame. Since 1997, the reference frame has been materialized by the optical HIPPARCOS positions of about 120000 stars. The HIPPARCOS has been compared with and linked to the International Celestial Reference Frame (ICRF). The ICRF is materialized by means of the radio positions of extragalactic sources using very large baseline interferometry observations. Both, the HIPPARCOS and Gaia missions belong to the European Space Agency, and it is important to note that the Gaia catalog is going to replace the HIPPARCOS catalog. It has been shown that the International Latitude Service zenith telescope data pertaining to ground-based surveys that span a time baseline of about 80yr, and which are also key when measuring proper motions, could be useful for the accurate determination of {mu}_{delta}_ for 387 ILS stars. Therefore, in this study we aim first to reduce these stars to the HIPPARCOS reference system; second, to made our original catalog of {mu}_{delta}_, which we refer to as the ILS catalog, for these 387 bright stars; third, to present comparison results of the four catalogs by pairs (the ILS, HIPPARCOS or HIP, new HIPPARCOS or NHIP, and Gaia DR2); and fourth, to analyze the differences in {mu}_{delta}_ between pairs of catalogs to characterize the {mu}_{delta}_ errors for these catalogs with a special focus on the Gaia DR2 and ILS catalogs. At seven ILS sites around the world at latitude 39.1{deg}, a set of seven telescopes was used to monitor the latitude variation via observations of the same stars for about 80 yr. Here, the inverse task was applied to improve {mu}_{delta}_ values of the 387 HIPPARCOS stars using the previously mentioned observations. Due to the specific Horrebow-Talcott method of the measured star pair, it is difficult to determine {mu}_{delta}_ for each single star. However, we achieved this by developing the original method and in combination with the HIPPARCOS data. We used the previously developed least squares method and formula to determine the coefficients, which describe the systematic part of differences in {mu}_{delta}_ between the pairs of catalogs. We calculated the coefficients with the aforementioned formula (in line with the coordinates, stellar magnitude, and color index of every star) to compare ILS, HIP, NHIP, and Gaia DR2 data of {mu}_{delta}_ against each other by using the set of 387 stars. The presented differences of {mu}_{delta}_ show that the systematic errors in the four catalogs are nearly at the same level of 0.1mas/yr. This means that the DR2 and ILS {mu}_{delta}_ values are in good agreement with each other, and with values from the HIPPARCOS and new HIPPARCOS catalogs. Also, the random errors of differences are small ones; they are near 1mas/yr for ILS-HIP and ILS-NHIP, and about 2mas/yr for ILS-DR2, HIP-DR2, and NHIP-DR2. It is important to note that there is a similar level of proper motion formal errors in HIPPARCOS and new HIPPARCOS catalogs.2019A&A...631A.145Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/631/A145CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/239 : The Hipparcos and Tycho Catalogues (ESA 1997)I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)I/345 : Gaia DR2 (Gaia Collaboration, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/631/A145https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/631/A145http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/631/A145https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/631/A145https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/631/A145http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/631/A145GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/631/A145/table5 (Proper motions in declination for 387 Gaia DR2 and Hipparcos stars from ILS observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/631/A145/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/631/A145/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/631/A145/table5?GETtext/xml+votable180.050000true0.053303338.3040450.0055555555555555566/433 435 472 624 701 721 754 846 864 871 903 953 962 1001 1017 1033 1052 1081 1246 1266 1299 1323 1330 1384 1408 1433 1444 1456 1472 1515 1527 1541 1584 1590 1622 1681 1687 1704 1739 1907 1926 1940 1967 2058 2114 2130 2194 2225 2227 2237 2247 2261 2266 2279 2306 2360 2391 2409 2427 2459 2489 2515 2543 2595 2638 2656 2685 2691 2702 2719 2723 2786 2798 2806 2816 2818 2826 2831 2846 2898 2936 2940 2949 2970 3023 3096 3105 3129 3137 3146 3196 3233 3239-3240 3243 3254 3328 4350 4465 4579 4735 4808 4886 4937 4979 4985 5060 5092-5093 5192 5230 5266 5304 5343 5349 5360 5399 5413 5415 5439 5464-5465 5482 5486 5503 5515 5627 5634 5659 5676 5684 5694 5718 5731 5784 5807 5815 5836 5853 5895 5937 5943 5948 5950 6008 6103 6117 6125 6191 6486 6489 6679 6709 6716 6758 6911 6966 7071 7101 7177 7199 7243 7257 7311 7343 7384 7433 7504 8494 8510 8577 8643 8881 8923 9046 9061 9078 9081 9105 9128 9160 9197 9222 9226 9292 9363 9428 9453 9502 9507 9521 9572 9620 9627 9650 9759 9762 9803 9812 9885 9915-9916 9943 9962 10014 10077 10142 10161 10256 10263 10266 10356 10375 10451 10471 10481 10495 10504 10533 10560 10562 10584 10595 10598 10602 10613 10661 10672 10699 10713 10768 10791 10834 10899 10948 10992 11057 11086 11089 11099 11128 11142 11170 11184-11185 11227 11290 11314 11359 11426 11485 11521 11554 11656 11780 12543 12598 12771 12918 12927 12956 13017-13018 13049 13096 13180 13258-13259 13264 13276 13313 13355 13364 13393 13459 13482 13507 13529 13544 13595 13613 13641 13645 13649 13674 13678 13703 13706 13717 13780 13816 13828 13830 13850 13883 13886 13944 13946 13953 13975 13980 13990-13991 14006 14027 14034 14043 14082 14114 14135 14146 14180 14209 14225 14239 14248 14263 14308 14379 14621 14641 14659 14691 14693 14697 14728 14733 14844 15088 15165 15366 15392 15449 15511 15514 15519 15524 15526 15578 15634 15885 19825 19859 19935 19947 19961 20118 20145 20190 20194 20279 20340 20363 20369 20385 20419 20447 20467 23974 23990 24186 24361 24372 24488 27887 27956 28093 28106-28107 28148 28172-28173 28189 28274 28305 28395-28396 28480 28487 28513 28522 28544 28605 28649 32522 32612https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/631/A145?format=asciidefaultJ/A+A/631/A145/table5Proper motions in declination for 387 Gaia DR2 and Hipparcos stars from ILS observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHIPHIP numbermeta.id;meta.mainintpmDEProper motion in declination (1)mas/yrpos.pm;pos.eq.decfloats_pmDEStandard deviation of the proper motion in declinationmas/yrstat.stdev;pos.pmfloatHIP+GaiaDR2Display the HIP new reduction (Cat. I/311) and Gaia DR2 (Cat. I.345) datameta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_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