J/A+A/649/A112ivo://CDS.VizieR/J/A+A/649/A112doi:10.26093/cds/vizier.36490112CDSVerbunt F.Schrimpf A.2023-03-16T14:12:54Z2021-05-26T16:44:12ZCDS support team

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

cds-question@unistra.frcatalogsastrometryWe analyse a manuscript star catalogue by Wilhem IV, Landgraf von Hessen-Kassel from 1586. From measurements of altitudes and of angles between stars, given in the catalogue, we find that the measurement accuracy averages 26 arcsec for eight fundamental stars, compared to 49 arcsec of the measurements by Brahe. The computation in converting altitudes to declinations and angles between stars to celestial position is very accurate, with errors negligible with respect to the measurement errors. Due to an offset in the position of the vernal equinox the positional error of the catalogue is slightly worse than that of Brahe's catalogue, but when correction is made for the offset -- which was known to 17th century astronomers -- the catalogue is more accurate than that of Brahe. We provide machine-readable Tables of the catalogue.2021A&A...649A.112Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/649/A112CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/239 : The Hipparcos and Tycho Catalogues (ESA 1997)J/A+A/516/A28 : Star catalogue of Tycho Brahe (1627) (Verbunt+, 2010)J/A+A/516/A29 : Star catalogue of Hevelius (1690) (Verbunt+, 2010)J/A+A/530/A93 : de Houtman, Kepler and Halley star catalogs (Verbunt+ 2011)J/A+A/544/A31 : Star catalogues of Ptolemaios, Ulugh Beg (Verbunt+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/649/A112https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/649/A112http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/649/A112https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/649/A112https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/649/A112http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/649/A112GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/649/A112/wilhiv (Positions in Star Catalogue of Wilhelm IV (WilhelmIV, table 5))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/649/A112/wilhiv?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/649/A112/wilhiv?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/649/A112/wilhiv?GETtext/xml+votable180.050000true37.954589.26410.0055555555555555566/15 79 90 155 161 341 428-429 435 463 472 474 666 689 737 771 826 1015 1143 1198 1397 1427 1430 1448 1460 1504 1539 1558 1633 1704 1728 1748-1749 1759 1766 2127 2282 2317 2340 2460 2591 2593 2664 2690 2837 2884 2924 2970 2973 3005 3020 3030 3060 3077 3102 3118 3134 3138 3176 3229 3625 3637 3678 4095 4143 4146 4224 4297 4419 4444 4559 4574 4670 4690 4724 5010 5154 5382 5535 5631 5718 5726 6082 6126 6154 6219 6298 6340 6674 7181 7205 7238 7402 7459 7545 7560 8284 8424 8476 8496 8509 8518 8571 8687 8690 8767 8834 8843 8845 9048 9054 9083 9093 9213 9219 9327 9520 9680 9717 9847 9857 9875 10055 10096 10101 10568 10695 10731 11109 11193 11202 11403 11473 11519 11534 11547 11599 11732 11851 11874 11959 12057 12082 12108 12131 12155 12255 12311 12390 12396 12472 12523 12526 12544 12864-12865 12953 12956 12960 12962 12964 13158 13282 13332-13333 13392 13414 13440 13494 13682 13688 13721 13778 14197 14396 14520 14522 14632 14677 14690 14711 14777 14797 14808 14852 14855 14878 14899 14906 14908 15179 15203 15583 15597 15621 15628 15633 15715 15940 15995 16023 16104-16105 16144 16213 16275 16834 17085 17266 17425 17487 17551 17608 17754 17783 17888 18166 18276 18311 18315 18416 18498 18797 18804 18856 18893 18911 18915 18978 19025 19029 19045 19202 19309 19329 19507 19585 19676 19797 19825 19827 19921 19930 20012 20308 20311 20322 20581 20759 20915 20940 21050 21089 21112 21196 21401 21423 21438-21439 21788 21879 21885 22015 22300 22334 22511 22787 22790 22805 22822 22837 22854 22862 22884 22966 23007 23360 23369 23483 23533 23538 23540 23547 23611 23717 23820 23864 23922 23963 23995-23996 24048 24179 24480 24562 24799 24877 25015-25016 25138 25199 25246 25278 25304 25659 25789 25869 26024 26174 26254 26320 26552 26633 26754 26758 26975 27198 27268 27282 27322 27574 27884 28208 28352 28737 28773 28940 28944 28968 29005 29390 30014 30114 30128 30419 30475 30529 30543 30567 30655 30722 30732 30818 30958 31475 31576 31784 31929 32271 32496 32610 39831 39853 39868 39877 39893 40408 40486 40795 42948 42956 42977 43004 44305 44360 44372 44389 44785 44799 44833 44903 45032 46939 48037 48587 48589 48856 48886https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/649/A112?format=asciidefaultJ/A+A/649/A112/wilhivPositions in Star Catalogue of Wilhelm IV (WilhelmIV, table 5)SimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWSequence number in Wilhelm IV Cataloguemeta.id;meta.mainintCSequence number of constellationmeta.numberintConAbbreviation of constellation namemeta.idchariSequence number of star in constellationmeta.numberintRA? Degrees of right ascension (1)pos.eq.ranullableDE? Degrees of declination (2)pos.eq.decnullableElonElon.z Elon.d Elon.m Elon.s (3)pos.ecliptic.loncharElatDegrees of ecliptic latitude (4)pos.ecliptic.latVWMagnitude as given by Wilhelm IVmagphot.mag;em.optintHIP? Hipparcos number of identificationmeta.numberintnullableIFlag indicating quality of identification (5)meta.code.qualintVmagMagnitude of Hipparcos identificationphot.mag;em.opt.VfloatDRADifference in right ascension: Wilhelm IV-HIParcminpos.eq.ra;arith.difffloatDDEDifference in declination: Wilhem IV-HIParcminpos.eq.dec;arith.difffloatDeltacAngle between corrected Wilhelm IV and HIParcminpos.angDistancefloatDlonDifference in longitude: Wilhelm IV-HIParcminpos;arith.difffloatDlatDifference in latitude: Wilhem IV-HIPPARCOSarcminpos;arith.difffloatDeltaUncorrected offset between Wilhelm IV and HIParcminpos;arith.difffloatDescrName or description of starmeta.notechar_RARight Ascension (J2000) from I/239/hip_maindegpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from I/239/hip_maindegpos.eq.dec;meta.mainnullableJ/A+A/649/A112/wilhivdiAngular distances in the Star Catalogue (WilhelmIV-Dist, table 6)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWSequence number in Wilhelm IV Cataloguemeta.id;meta.mainintWRSequence number of reference starmeta.idintF[0/2] Flag for repeat entry (1)meta.code.errorintphiDegrees of angle between star and reference star (2)pos.angDistancedphiDifference catalogue angle and HIP value, phi - phi_HIParcminpos.angDistancefloatReferName or description of reference starmeta.ref;pos.framecharHIP? HIPPARCOS number of entrymeta.idintnullableHIPrHIPPARCOS number of reference starmeta.idintJ/A+A/649/A112/wilhivalAltitudes in Star the Catalogue (WilhelmIV-Alt, table 7)dhDifference altitude with altitude from HIP, h - h_HIParcminpos;arith.difffloatHIP? HIPPARCOS number of entrymeta.idintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWSequence number in Wilhelm IV Cataloguemeta.id;meta.mainintF[0/1] flag for repeated entry (1)meta.code.errorinthDegrees of altitude (2)pos.cartesian.zU[SIM] flag indicating nature of altitude (3)meta.codechar