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<ri:Resource created="2007-03-29T11:57:11Z" status="active" updated="2025-06-13T15:25:00Z" version="1.2" xmlns:cs="http://www.ivoa.net/xml/ConeSearch/v1.0" xmlns:ri="http://www.ivoa.net/xml/RegistryInterface/v1.0" xmlns:vr="http://www.ivoa.net/xml/VOResource/v1.0" xmlns:vs="http://www.ivoa.net/xml/VODataService/v1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.ivoa.net/xml/ConeSearch/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/ConeSearch.xsd http://www.ivoa.net/xml/VOResource/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/VOResource.xsd http://www.ivoa.net/xml/VODataService/v1.1 http://vo.ari.uni-heidelberg.de/docs/schemata/VODataService.xsd" xsi:type="vs:CatalogService"><title>Guide Star Photometric Catalog, Updated Version 1</title><shortName>II/143A</shortName><identifier>ivo://CDS.VizieR/II/143A</identifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Lasker B.M.</name></creator><creator><name>Sturch C.R.</name></creator><creator><name>Lopez C.</name></creator><creator><name>Mallama A.D.</name></creator><creator><name>McLaughlin S.F.,Russell J.L.</name></creator><creator><name>Wisniewski W.Z.</name></creator><creator><name>Gillespie B.A.</name></creator><creator><name>Jenkner H.,Siciliano E.D.</name></creator><creator><name>Kenny D.</name></creator><creator><name>Baumert J.H.</name></creator><creator><name>Goldberg A.M.,Henry G.W.</name></creator><creator><name>Kemper E.</name></creator><creator><name>Siegel M.J.</name></creator><date role="Updated">2012-09-24T07:18:18Z</date><date role="Created">2007-03-29T11:57:11Z</date><contact><name>CDS support team</name><address>CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France</address><email>cds-question@unistra.fr</email></contact></curation><content><subject>photometry</subject><subject>visible-astronomy</subject><subject>Wide-band photometry</subject><subject>astronomical-reference-materials</subject><description>The Guide Star Photometric Catalog (GSPC) is an all-sky set of 1477 photoelectrically determined BV sequences covering the magnitude range from 9 to 15. The GSPC was created to provide photometric calibrators for the HST Guide Star Catalog (GSC). Each sequence nominally contains (at least) six stars, each with a photometric precision of 0.05 mag. In practice, a small number of sequences contain fewer stars; and the precisions achieved for the faintest stars are more nearly 0.1 mag. For declinations greater than +3 degrees the sequences generally lie near the centers of the original Palomar Observatory - National Geographic Society Sky Atlas. Other sequences lie near the centers of the ESO/SERC Southern Sky Atlas. The catalog also includes a list of suspected variable stars, a bibliography of literature sequences, and additional information which was useful in the data reduction and for quality control of the final catalog. The full catalog is made of 7 FITS files: tables 1 to 5, references (table 6 of the paper) and the actual catalogue (table 7 of the paper). The ascii versions of Tables 1 to 5 are included in this file; the ascii version of the references (refs.dat) and of the actual catalogue (catalog.dat) are described here. The updated version 1 was created by replacing photometric sequences P040, P421, S335 and S742 in GSPC version 1. The updated sequences have improved photometry and/or positions. In addition the sigma's in V and B-V (here e_V and e_B-V) were replaced with the values provided by the authors when we noted a discrepancy with the published values.</description><source format="bibcode">1988ApJS...68....1L</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/II/143A</referenceURL><type>Catalog</type><contentLevel>Research</contentLevel><relationship><relationshipType>IsServedBy</relationshipType><relatedResource ivo-id="ivo://CDS.VizieR/TAP">TAP VizieR generic service</relatedResource></relationship><relationship><relationshipType>IsServedBy</relationshipType><relatedResource>Conesearch service</relatedResource></relationship><relationship><relationshipType>related-to</relationshipType><relatedResource ivo-id="ivo://CDS.VizieR/I/220">I/220 : The HST Guide Star Catalog</relatedResource><relatedResource>Description of the 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(sigma) Error in B-V Color</description><unit>mag</unit><ucd>stat.error;phot.color;em.opt.B</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>RA1950</name><description>1950.0 Right Ascension - Hours</description><ucd>pos.eq.ra;meta.main</ucd></column><column><name>DE1950</name><description>1950.0 Declination - Degrees</description><ucd>pos.eq.dec;meta.main</ucd></column><column><name>u_DE1950</name><description>Uncertainty flag (:) on RA and DE (4)</description><ucd>meta.code.error;pos.eq.dec</ucd><dataType xsi:type="vs:VOTableType" arraysize="1*">char</dataType></column><column><name>Err</name><description>[*bu] Error/update indicator (2)</description><ucd>meta.note</ucd><dataType xsi:type="vs:VOTableType" arraysize="1*">char</dataType></column><column><name>CTIO</name><description>[C] CTIO Observation Indicator</description><ucd>meta.note</ucd><dataType xsi:type="vs:VOTableType" arraysize="1*">char</dataType></column><column><name>o_CTIO</name><description>? Number of CTIO Observations</description><ucd>meta.number</ucd><dataType xsi:type="vs:VOTableType">int</dataType><flag>nullable</flag></column><column><name>SPO</name><description>[S] SPO (Sacremento) Observation Indicator</description><ucd>meta.note</ucd><dataType xsi:type="vs:VOTableType" arraysize="1*">char</dataType></column><column><name>o_SPO</name><description>? Number of SPO Observations</description><ucd>meta.number</ucd><dataType xsi:type="vs:VOTableType">int</dataType><flag>nullable</flag></column><column><name>UAO</name><description>[A] UAO (Arizona) Observation Indicator</description><ucd>meta.note</ucd><dataType xsi:type="vs:VOTableType" arraysize="1*">char</dataType></column><column><name>o_UAO</name><description>? Number of UAO Observations</description><ucd>meta.number</ucd><dataType xsi:type="vs:VOTableType">int</dataType><flag>nullable</flag></column><column><name>Lit</name><description>[LM] Literature or Multiple Sequence (3)</description><ucd>meta.note</ucd><dataType xsi:type="vs:VOTableType" arraysize="1*">char</dataType></column><column><name>RefLit</name><description>Literature Reference</description><ucd>meta.bib</ucd><dataType xsi:type="vs:VOTableType" arraysize="11*">char</dataType></column><column><name>_RA.icrs</name><description>Right ascension (ICRS) (computed by VizieR, not part of the original data)</description><ucd>pos.eq.ra</ucd><flag>nullable</flag><flag>indexed</flag></column><column><name>_DE.icrs</name><description>Declination (ICRS) (computed by VizieR, not part of the original data)</description><ucd>pos.eq.dec</ucd><flag>nullable</flag><flag>indexed</flag></column></table><table><name>II/143A/refs</name><description>References (flat ascii)</description><column><name>recno</name><description>Record number assigned by the VizieR team. Should Not be used for identification.</description><ucd>meta.record</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>Plate</name><description>Plate designation</description><ucd>meta.id.part;meta.main</ucd><dataType xsi:type="vs:VOTableType" arraysize="6*">char</dataType></column><column><name>Field</name><description>Field designation</description><ucd>meta.id.part;meta.main</ucd><dataType xsi:type="vs:VOTableType" arraysize="14*">char</dataType></column><column><name>CatRef</name><description>Catalog Reference</description><ucd>meta.bib</ucd><dataType xsi:type="vs:VOTableType" arraysize="6*">char</dataType></column><column><name>LitRef</name><description>Literature Reference</description><ucd>meta.bib</ucd><dataType xsi:type="vs:VOTableType" arraysize="90*">char</dataType></column></table></schema></tableset></ri:Resource>