J/AJ/163/131ivo://CDS.VizieR/J/AJ/163/131doi:10.26093/cds/vizier.51630131CDSMunn J.A.Subasavage J.P.Harris H.C.Tilleman T.M.2022-09-30T22:23:10Z2022-05-23T07:45:48ZCDS support team

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

cds-question@unistra.frinfrared-photometryvisible-astronomyphotometryastrometryproper-motionsWe present the United States Naval Observatory (USNO) Bright-star Astrometric Database (UBAD), a current-epoch high-accuracy astrometric catalog. The catalog consists of 364 bright northern hemisphere stars, including all but five such stars with either V<3.5 or with I<3.2 and V<6, as well as a large fraction of slightly fainter stars; 36 of the brightest catalog stars are not included in Gaia Early Data Release 3 (EDR3). Observations were conducted with the USNO Flagstaff Station Kaj Strand 61 inch Astrometric Reflector. Target stars were imaged through a small 12.5mag neutral-density spot, while the remainder of the stars in the field of view were unattenuated. This allowed for unsaturated images of the bright target stars to be calibrated directly against much fainter reference stars from Gaia EDR3. The median position errors are 1.9mas in both R.A. and decl. at the catalog epoch of 2017.0, with 90% of catalog stars having errors less than 2.6mas; systematic errors are 1-3 mas. Combining UBAD observations with Hipparcos-2 positions yields proper motions with median errors of 0.045 and 0.049mas/yr in R.A. and decl., respectively, with 90% of stars having errors less than 0.1mas/yr; systematic errors are about 0.1mas/yr. Single-frame accuracy for positions of the target stars is typically 5-6mas. Gaia EDR3 astrometry for these bright stars, which are heavily saturated in the Gaia observations, is validated over the magnitude range 2<~G<~6.2022AJ....163..131Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/163/131CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/simbad : Simbad objects catalogue (M.Wenger 2000)B/sb9 : 9th Catalogue of Spectroscopic Binary Orbits (Pourbaix+ 2004-2014)B/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2020)I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)V/122 : SB9; 9th Catalogue of Spectroscopic Binary Orbits (Pourbaix+ 2005)J/AJ/129/2420 : Proper motion derivatives of binaries (Makarov+, 2005)J/AJ/154/147 : Astrometry&photometry late-type dwarfs&subdwarfs (Dahn+, 2017)J/ApJ/867/105 : ATLAS all-sky stellar ref. cat, ATLAS-REFCAT2 (Tonry+, 2018)J/AJ/162/44 : Near-IR spectrum HIP109427 with SCExAO/CHARIS (Steiger+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/163/131https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/163/131http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/163/131https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/163/131https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/163/131http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/163/131GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/163/131/table1 (United States Naval Observatory Bright-star Astrometric Database catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/163/131/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/163/131/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/163/131/table1?GETtext/xml+votable180.050000true2.097635329.08966370.005555555555555556Cone search capability for table J/AJ/163/131/table2 (Single-epoch positions)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/163/131/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/163/131/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/163/131/table2?GETtext/xml+votable180.050000true85.1897079-1.94259360.0055555555555555566/15 79 254 290 341 474 689 737 846 959 998 1015 1143 1198 1286 1397 1399 1408 1427 1430 1448 1460 1472 1504 1535 1633 1704 1728 1749 1766 1770 2025 2040 2127 2282 2340 2460 2499 2837 2973 3005 3020 3030 3077 3134 3138 3176 3208 3229 3401 3462 3469 3489 3625 3637 4143 4146 4181 4419 4444 4559 4574 4578 4624 4690 4768 4772 4929 4972 4990 5010 5154 5245 5362 5382 5415 5535 5587 5631 5718 5726 6082 6126 6154 6166 6196 6203 6219 6241 6267 6298 6340 6510 6536 6714 6897 6966 7149 7205 7238 7285 7288 7402 7459 7545 7560 7937 8099 8430 8476 8509 8534 8573 8577 8644 8671 8687 8767 8834 8845 8986 9012 9048 9083 9092-9093 9127 9213 9219 9327 9441 9520 9610 9639 9717 9786 9813 9838 9874 9939 10023 10055 10101 10367 10380 10568 10696 10731 10737 10783 10879 10960 10992 11097 11109 11193 11202-11203 11473 11519 11544 11547 11599 11874 11894 11958 12057 12082 12130 12176 12311 12526 12544 12604 12720 12725 12770 12864 12877 12935 12953 12964 13052 13158 13211 13231 13282 13332-13333 13392 13414 13440 13550 13746 13778 13803 13861 13895 13960 13975 14005 14048 14084 14110 14115 14197 14259 14328 14373 14396 14522 14613 14632 14690 14711 14729 14777 14797 14808 14878 14906-14907 14917 14968 15088 15203 15364 15384 15583 15597 15628 15633 15650 15674 15715 15749 15969 15986 15988 15995 16023 16094 16105 16144 16213 17771 17783 18166 18204 18276 18315 18416 18775 18893 18911 19186 19284 19286 19309 19329 19490 19611 19676 19761 19847 19879 19930 20012 20054 20091 20261 20311 20322 21941 22015 22300 22334-22335 22418 22473 22483 22511 22854 22941 22964 22966 23007 23369 23421 23423 23483 23533 23538 23540 23547 23611 23695 23717 23820 23864 23876 23883 23922 23995-23996 24048 24164 24179 24333 24420 24480 24557 24562 24570 26312 26320 26412 26552 26975 27366 27457 27553 27568 27574 27694 27752 27788 27884 27978 28028 28208 28352 28364 28487 30128 30475 30518 30529 30543 30567 30655 31187 31475 31576 31629 31686 31709 31751 31784 31929 32023 32182 32185 32258 32271 32291 32311 32477 32496 32519 32575 32621 32645 32725 32754https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/163/131?format=asciiOpticalInfrareddefaultJ/AJ/163/131/table1United States Naval Observatory Bright-star Astrometric Database catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHIP[677/118131] Hipparcos identifiermeta.id;meta.mainintprimarySimbadSimbad column added by the CDSmeta.ref.urlcharRAICRS[2/360] Right Ascension (ICRS, epoch 2017.0)degpos.eq.ra;meta.maine_RAICRS[1/69] Error in RAdeg*cos(DEdeg)masstat.error;pos.eq.rafloat_RA.icrsRight ascension (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.decnullableindexedClassVisual classification of the target (3)src.classcharDEICRS[0.1/78] Declination (ICRS, epoch 2017.0)degpos.eq.dec;meta.maine_DEICRS[1.6/45] Error in DEdegmasstat.error;pos.eq.decfloatpmRA[-1094/1083] Proper motion in Right Ascension *cos(DE)mas/yrpos.pm;pos.eq.radoublee_pmRA[0.01/61] Error in pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDE[-2000/819] Proper motion in declinationmas/yrpos.pm;pos.eq.decdoublee_pmDE[0.02/40] Error in pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatni[0/42] Number of UBAD i observations used in fitmeta.numberintnz[0/20] Number of UBAD z observations used in fitmeta.numberintused?[0/1] Hipparcos-2 used flag (1)meta.codeintrms-RA[1.04/14.1] RMS of the fit in right ascension (2)masstat.fit.param;meta.modelledfloatchi2-RA[0.08/7.74] Reduced chi-square of fit in RAstat.fit.param;meta.modelledfloatrms-DE[1.24/13] RMS of the fit in declination (2)maspos.eq.dec;arith.difffloatchi2-DE[0.1/7.87] Reduced chi-square of fit in DEstat.fit.param;meta.modelledfloatNobsNumber of observations (table2)meta.numberintnullableJ/AJ/163/131/table2Single-epoch positionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEpoch[2016/2021] Observation epochtime.epoch;obsdoubleHIP[677/118131] Hipparcos identifiermeta.id;meta.mainintRAICRS[2/360] Right ascension (ICRS astrometric place)degpos.eq.ra;meta.maine_RAICRS[3/28] Error in RAdegmasstat.error;pos.eq.rafloatDEICRS[-2/78] Declination (ICRS, astrometric place)degpos.eq.dec;meta.maine_DEICRS[3/48] Error in DEdegmasstat.error;pos.eq.decfloatTexp[15/3333] Exposure timestime.duration;obs.exposurefloatairmass[1/1.45] Weighted mean airmassobs.airMassfloatNstars[6/183] Number of Gaia stars used in solutionmeta.numberintRA-RMS[0.52/120] RMS of plate solution in right ascensionmasstat.stdev;stat.fit;instr.plateDE-RMS[1.09/197] RMS of plate solution in declinationmaspos.eq.dec;arith.diffseeing[0.65/3.89] Clipped mean FWHM of detections on imagearcsecinstr.obsty.seeingfloatelong[1/1.25] Clipped mean elongation of detectionspos.angDistance;stat.mean