J/AJ/153/20ivo://CDS.VizieR/J/AJ/153/20doi:10.26093/cds/vizier.51530020CDSMason B.D.Hartkopf W.I.Bredthauer G.Ferguson E.W.Finch C.T.,Kilian C.M.Rafferty T.J.Ragan T.J.Wieder G.D.2017-07-18T15:14:50Z2017-06-15T14:35:38ZCDS support team

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

cds-question@unistra.frmultiple-starsinterferometryThe results of 2408 intensified CCD observations of double stars, made with the 26 inch refractor of the U.S. Naval Observatory, are presented. Each observation of a system represents a combination of over 2000 short-exposure images. These observations are averaged into 1602 mean relative positions and range in separation from 1.94'' to 107.41'', with a median separation of 11.96''. This is the twenty-first in this series of papers and covers the period from 2015 January 13 through 2015 December 19. Significant instrumentation changes are reported in this paper.2017AJ....153...20Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/153/20CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2014)J/AJ/150/136 : Speckle interferometry at USNO. XX. (Hartkopf+, 2015)J/AJ/146/56 : Speckle interferometry at the USNO. XIX. (Mason+, 2013)J/AJ/127/539 : Speckle interferometry at USNO. IX. (Mason+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/153/20https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/153/20http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/153/20https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/153/20https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/153/20http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/153/20GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/153/20/table1 (*ICCD measurements of double stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/153/20/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/153/20/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/153/20/table1?GETtext/xml+votable180.050000trueCone search capability for table J/AJ/153/20/table2 (*Measurements of systems with orbits or linear solutions)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/153/20/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/153/20/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/153/20/table2?GETtext/xml+votable180.050000true1.420958345.81202780.0055555555555555566/465 1283 1299 1328 1375 1505 1587 1681 1695 1765 1786 1935 1946 2096 2438 2443 2448 2536 2652 2654 2704 2736 2747 2779 2782 2828 2864 2867 2872 2977 2985 3014 3021 3024 3071 3186 3196 3211 3249 3256 3259 3283 3353 3359 3368 3384 3462 3507 3620 3622 3656 3682 3718 3819 4296 4336 4662 5059 5498 5621 5777 5944 6042 6340 6418 6703 6907 6973 7018 7192 8284 8354 8518 8522 8772 8790 10010 10729 10741 10880 10881 11243 11247 11500 11642 12303 12332 12397 12471 12485 12487 12507 12526 12613 12727 13108 13151 13259 13269 13293 13484 13622 13645 13670 13707 13731 13766 13815 13822 13841 13897 13945 13946 13948 13953 13954 13968 13994 14044 14134 14181 14196 14198 14326 14332 14369 14685 15406 15718 15735 15812 15924 17582 17598 17802 17806 18029 18311 18865 18936 19026 19109 19129 19136 19191 19507 20310 20390 20432 20469 21485 21590 22129 22131 22132 22161 22271 22414 22854 22904 23071 23637 23717 24129 24130 24139 24542 25074 26259 27088 27274 27439 28666 29106 29882 30205 30269 30286 30307 30448 30464 30859 31054 31093 31678 31814 31824 31926 31982 32016 32086 32271 44378 44643 44891 48923 49103https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/153/20?format=asciidefaultJ/AJ/153/20/table1*ICCD measurements of double starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWDSWDS designation (HHMMm+DDMM; J2000)meta.id;meta.maincharprimaryDiscDiscoverer designationmeta.idcharNotindicates a system that was observed but not detected (table3)meta.ref.urlcharCompComponentmeta.code.multipcharEpoch[2011.81/2015.97] Epoch of observation (expressed as a fractional Julian year)yrtime.epochdoublePA[0/360]? Position angle (G1)degpos.posAngfloatnullableu_PA[:] Uncertainty flag for PA (G2)meta.code.errorcharSep[1.94/107.41]? Separation (G1)arcsecpos.angDistance;src.orbitalfloatnullableu_Sep[:] Uncertainty flag for Sep (G2)meta.code.errorcharNobs[1/20] Number of independent measurements (i.e., observations obtained on different nights) contained in the meanmeta.numberintNote[ABCD] Object notes (1)meta.notecharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAExplain (right ascension part)degpos.eq.ra;meta.mainnullable_DEExplain (declination part)degpos.eq.dec;meta.mainnullableJ/AJ/153/20/table2*Measurements of systems with orbits or linear solutionsCompComponentmeta.code.multipcharDiscDiscoverer designationmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWDSWDS designation (HHMMm+DDMM; J2000)meta.id;meta.maincharEpoch[2015/2016]? Epoch of observationyrtime.epochdoublenullablePA[2.8/353.4]? Position angle {theta} (G1)degpos.posAngfloatnullableu_PA[:] Uncertainty flag for PA (G2)meta.code.errorcharSep[3.76/57.33]? Separation {rho} (G1)arcsecpos.angDistance;src.orbitalfloatnullableu_Sep[:] Uncertainty flag for Sep (G2)meta.code.errorcharNobs[1/10]? Number of independent measurements (i.e., observations obtained on different nights) contained in the meanmeta.numberintnullableO-Ct[-4.2/2.7]? The O-C residual in {theta}degstat.fit.residualfloatnullableO-Cr[-0.84/0.85]? The O-C residual in {rho}arcsecstat.fit.residualfloatnullableRefReference for the O-C residualsmeta.ref;pos.framecharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAExplain (right ascension part)degpos.eq.ra;meta.mainnullable_DEExplain (declination part)degpos.eq.dec;meta.mainnullableJ/AJ/153/20/table3Double stars not foundrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWDSWDS designation (HHMMm+DDMM; J2000)meta.id;meta.maincharDiscDiscoverer designationmeta.idcharCompComponentmeta.code.multipcharYear[1896/1942] Year (1)yrtimeintPA[100/245] Position angle {theta} (1)degpos.posAngintSep[3.5/7] Separation {rho} (1)arcsecpos.angDistance;src.orbitalfloatmag1[8.7/11.4] Published magnitude of primarymagphot.magfloatmag2[10/11.9] Published magnitude of secondarymagphot.magfloatNote[1/3]? Notes (1, 2, or 3) (2)meta.noteintnullable