J/AJ/124/601ivo://CDS.VizieR/J/AJ/124/601doi:10.26093/cds/vizier.51240601CDSPlatais I.Kozhurina-Platais V.Girard T.M.van Altena W.F.,Klemola A.R.Stauffer J.R.Armandroff T.E.Mighell K.J.Dell'Antonio I.,Falco E.E.Sarajedini A.2023-04-06T16:50:53Z2002-08-10T16:07:43ZCDS support team

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

cds-question@unistra.fropen-star-clustersproper-motionsvisible-astronomybroad-band-photometryThe field of direct imaging is experiencing a considerable growth in the number of available CCD mosaic imagers, especially on large telescopes. To fully exploit the astrometric potential of these imaging devices, we develop a technique, utilizing an astrometric standard, for precision transformation of pixel coordinates into a global coordinate system. We have constructed a new astrometric standard set of 1863 stars in the field of NGC 188 to derive the CCD chip constants for the NOAO CCD Mosaic Imager. The multiple-epoch data on the Mosaic's metrics indicate that this CCD mosaic device may have experienced a one-time nonelastic expansion. We also present a new determination of the pixel scale and the optical field angle distortion constants for the KPNO Mayall 4 m telescope prime focus field corrector. To establish a reliable history of the CCD mosaic imager metrics for current and potential future astrometric applications, we recommend obtaining astrometric calibrations for CCD mosaic imagers on a regular basis. Apart from mechanical positioning of the CCD mosaic camera on the telescope, noticeable changes in the thermal environment of CCD mosaic chips should also prompt new astrometric calibrations. It is shown that, following all precautions, the NOAO CCD Mosaic Imager can produce excellent astrometric results on the Mayall 4 m telescope.2002AJ....124..601Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/124/601CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/122/1486 : NGC 2451A proper motions and membership (Platais+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/124/601https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/124/601http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/124/601https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/124/601https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/124/601http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/124/601GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/124/601/ngc188 (Catalog of positions, absolute proper motions and BV photographic photometry in the region of open cluster NGC 2451)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/124/601/ngc188?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/124/601/ngc188?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/124/601/ngc188?GETtext/xml+votable180.050000true5.62288977285.4697208730.0055555555555555565/1019 6/4073-4075 4088 16349https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/124/601?format=asciiOpticaldefaultJ/AJ/124/601/platesPlate materialrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPlatePlate number (1)obs.fieldcharObsDateObservation datetime.epochnullableObsTime1Time of beginning of the observationtime.epochnullableObsTime2Time of end of the observationtime.epochnullablen_ObsTime1UT or LST time of observationmeta.notecharEmulEmulsioninstr.plate.emulsioncharFilterFiltermeta.code;instr.filtercharObsObserver's nameobs.observercharJ/AJ/124/601/ngc188Catalog of positions, absolute proper motions and BV photographic photometry in the region of open cluster NGC 2451recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDObject identifiermeta.id;meta.mainintRA(ICRS)Right ascension for the epoch 2000 and in the ICRS reference system (i.e. equinox 2000.0)degpos.eq.ra;meta.mainDE2000Declination for the epoch 2000, equinox 2000.0degpos.eq.dec;meta.mainpmRAAbsolute proper motion in right ascension multiplied by cos(DE)mas/yrpos.pm;pos.eq.rafloatpmDEAbsolute proper motion in declinationmas/yrpos.pm;pos.eq.decfloatVmagPhotographic V-magnitudemagphot.mag;em.opt.VfloatB-VPhotographic B-V colormagphot.color;em.opt.B;em.opt.Vfloate_pmRAEstimated standard error of proper motion in one coordinate (mean of RA and DE)mas/yrstat.errorfloatn_RAradNumber of plates used for a solution in right ascensionmeta.noteintn_DEradNumber of plates used for a solution in declinationmeta.noteint