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<ri:Resource created="2021-05-31T07:32:39Z" status="active" updated="2025-05-19T09:50:00Z" 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>Synthetic RGB photometry of bright stars</title><shortName>J/MNRAS/504/3730</shortName><identifier>ivo://CDS.VizieR/J/MNRAS/504/3730</identifier><altIdentifier>doi:10.26093/cds/vizier.75043730</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Cardiel N.</name></creator><creator><name>Zamorano J.</name></creator><creator><name>Bara S.</name></creator><creator><name>Sanchez de Miguel A.</name></creator><creator><name>Cabello C.,Gallego J.</name></creator><creator><name>Garcia L.</name></creator><creator><name>Gonzalez R.</name></creator><creator><name>Izquierdo J.</name></creator><creator><name>Pascual S.</name></creator><creator><name>Robles J.,Sanchez A.</name></creator><creator><name>Tapia C.</name></creator><date role="Updated">2024-08-21T20:17:45Z</date><date role="Created">2021-05-31T07:32:39Z</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>ccd-photometry</subject><description>Although the use of RGB photometry has exploded in the last decades due to the advent of high-quality and inexpensive digital cameras equipped with Bayer-like colour filter systems, there is surprisingly no catalogue of bright stars that can be used for calibration purposes. Since due to their excessive brightness, accurate enough spectrophotometric measurements of bright stars typically cannot be performed with modern large telescopes, we have employed historical 13-colour medium-narrow-band photometric data, gathered with quite reliable photomultipliers, to fit the spectrum of 1346 bright stars using stellar atmosphere models. This not only constitutes a useful compilation of bright spectrophotometric standards well spread in the celestial sphere, the UCM library of spectrophotometric spectra, but allows the generation of a catalogue of reference RGB magnitudes, with typical random uncertainties ~0.01 mag. For that purpose, we have defined a new set of spectral sensitivity curves, computed as the median of 28 sets of empirical sensitivity curves from the literature, that can be used to establish a standard RGB photometric system. Conversions between RGB magnitudes computed with any of these sets of empirical RGB curves and those determined with the new standard photometric system are provided. Even though particular RGB measurements from single cameras are not expected to provide extremely accurate photometric data, the repeatability and multiplicity of observations will allow access to a large amount of exploitable data in many astronomical fields, such as the detailed monitoring of light pollution and its impact on the night sky brightness, or the study of meteors, Solar system bodies, variable stars, and transient objects. In addition, the RGB magnitudes presented here make the sky an accessible and free laboratory for the calibration of the cameras themselves.</description><source format="bibcode">2021MNRAS.504.3730C</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/504/3730</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/V/50">V/50 : Bright Star Catalogue, 5th Revised Ed. 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49123</spatial><spectral>3.322582951404819e-19 4.920466254354166e-19</spectral><footprint ivo-id="ivo://ivoa.net/std/moc">https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/504/3730?format=ascii</footprint></coverage><tableset><schema><name>default</name><table><name>J/MNRAS/504/3730/table2</name><description>Catalogue with RGB magnitudes for 1346 stars</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>HR</name><description>Harvard Revised Number = Bright Star Number</description><ucd>meta.id;meta.main</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>RAJ2000</name><description>Right ascension (J2000)</description><unit>deg</unit><ucd>pos.eq.ra;meta.main</ucd></column><column><name>DEJ2000</name><description>Declination (J2000)</description><unit>deg</unit><ucd>pos.eq.dec;meta.main</ucd></column><column><name>DbleName</name><description>Identification of double star companion (1)</description><ucd>meta.id.assoc</ucd><dataType xsi:type="vs:VOTableType" arraysize="11*">char</dataType></column><column><name>VarName</name><description>Identification if star is a known variable (2)</description><ucd>meta.id</ucd><dataType xsi:type="vs:VOTableType" arraysize="9*">char</dataType></column><column><name>VarType</name><description>Variability type (3)</description><ucd>meta.note</ucd><dataType xsi:type="vs:VOTableType" arraysize="10*">char</dataType></column><column><name>f33</name><description>Flux density in the 33 (0.33um) filter in 10^-9^erg/s/cm^-2^/{AA} unit</description><unit>1e-11W.m**-2</unit><ucd>phot.flux.density</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>f35</name><description>Flux density in the 35 (0.35um) filter in 10^-9^erg/s/cm^-2^/{AA} unit</description><unit>1e-11W.m**-2</unit><ucd>phot.flux.density</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>f37</name><description>Flux density in the 37 (0.37um) filter in 10^-9^erg/s/cm^-2^/{AA} unit</description><unit>1e-11W.m**-2</unit><ucd>phot.flux.density</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>f40</name><description>Flux density in the 40 (0.40um) filter in 10^-9^erg/s/cm^-2^/{AA} unit</description><unit>1e-11W.m**-2</unit><ucd>phot.flux.density</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>f45</name><description>Flux density in the 45 (0.45um) filter in 10^-9^erg/s/cm^-2^/{AA} unit</description><unit>1e-11W.m**-2</unit><ucd>phot.flux.density</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>f52</name><description>Flux density in the 52 (0.52um) filter in 10^-9^erg/s/cm^-2^/{AA} unit</description><unit>1e-11W.m**-2</unit><ucd>phot.flux.density</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>f58</name><description>Flux density in the 58 (0.58um) filter in 10^-9^erg/s/cm^-2^/{AA} unit</description><unit>1e-11W.m**-2</unit><ucd>phot.flux.density</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>f63</name><description>Flux density in the 63 (0.63um) filter in 10^-9^erg/s/cm^-2^/{AA} unit</description><unit>1e-11W.m**-2</unit><ucd>phot.flux.density</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>f72</name><description>? Flux density in the 72 (0.72um) filter in 10^-9^erg/s/cm^-2^/{AA} unit</description><unit>1e-11W.m**-2</unit><ucd>phot.flux.density</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>f80</name><description>? Flux density in the 80 (0.80um) filter in 10^-9^erg/s/cm^-2^/{AA} unit</description><unit>1e-11W.m**-2</unit><ucd>phot.flux.density</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>f86</name><description>? Flux density in the 86 (0.68um) filter in 10^-9^erg/s/cm^-2^/{AA} unit</description><unit>1e-11W.m**-2</unit><ucd>phot.flux.density</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>f99</name><description>? Flux density in the 99 (0.99um) filter in 10^-9^erg/s/cm^-2^/{AA} unit</description><unit>1e-11W.m**-2</unit><ucd>phot.flux.density</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>f110</name><description>? Flux density in the 110 (1.10um) filter in 10^-9^erg/s/cm^-2^/{AA} unit</description><unit>1e-11W.m**-2</unit><ucd>phot.flux.density</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>Teff</name><description>Effective temperature from fit to CK04 model (4)</description><unit>K</unit><ucd>phys.temperature.effective</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>e_Teff</name><description>Uncertainty in Teff</description><unit>K</unit><ucd>stat.error;phys.temperature.effective</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>logg</name><description>Logarithm of the surface gravity</description><unit>log(cm.s**-2)</unit><ucd>phys.gravity</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>e_logg</name><description>Uncertainty in logg</description><unit>log(cm.s**-2)</unit><ucd>stat.error</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>Metal</name><description>Metallicity</description><ucd>phys.abund.Fe</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>e_Metal</name><description>Uncertainity in Metal</description><ucd>stat.error;phys.abund.Z</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>csc</name><description>Scaling factor: fluxes -&gt; flux densities</description><ucd>arith.factor</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>Bsimbad</name><description>? Johnson B mag (from Simbad, '---' if NA)</description><unit>mag</unit><ucd>phot.mag;em.opt.B</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>Vsimbad</name><description>? Johnson V mag (from Simbad, '---' if NA)</description><unit>mag</unit><ucd>phot.mag;em.opt.V</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>Bck04</name><description>Johnson B mag measured in fitted CK04 model (4)</description><unit>mag</unit><ucd>phot.mag;em.opt.B</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>e_Bck04</name><description>Uncertainty in Bck04</description><unit>mag</unit><ucd>stat.error</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>Vck04</name><description>Johnson V mag measured in fitted CK04 model (4)</description><unit>mag</unit><ucd>phot.mag;em.opt.V</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>e_Vck04</name><description>Uncertainty in Vck04</description><unit>mag</unit><ucd>stat.error</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>Brgb</name><description>Standard blue RGB estimate</description><unit>mag</unit><ucd>phot.mag;em.opt.B</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>e_Brgb</name><description>Uncertainty in Brgb</description><unit>mag</unit><ucd>stat.error</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>Grgb</name><description>Standard green RGB estimate</description><unit>mag</unit><ucd>phot.mag;em.opt.V</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>e_Grgb</name><description>Uncertainty in Grgb</description><unit>mag</unit><ucd>stat.error</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>Rrgb</name><description>Standard red RGB magnitude</description><unit>mag</unit><ucd>phot.mag;em.opt.R</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>e_Rrgb</name><description>Uncertainty in Rrgb</description><unit>mag</unit><ucd>stat.error</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>Simbad</name><description>Simbad column added by the CDS</description><ucd>meta.ref.url</ucd><dataType xsi:type="vs:VOTableType" arraysize="*">char</dataType></column></table><table><name>J/MNRAS/504/3730/table3</name><description>Double stars from the JM75 (Johnson &amp; Mitchell, 1975RMxAA...1..299J, Cat. II/84) for which the individual fluxes of the two stars have been coadded to derive the resulting integrated B and V magnitudes.</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>Flag</name><description>[*] Note (1)</description><ucd>meta.code.error</ucd><dataType xsi:type="vs:VOTableType" arraysize="1*">char</dataType></column><column><name>Star1</name><description>Initial star identification provided in JM75, HRNNNN</description><ucd>meta.id;meta.main</ucd><dataType xsi:type="vs:VOTableType" arraysize="6*">char</dataType></column><column><name>B1mag</name><description>? B magnitude of Star 1 (from Simbad)</description><unit>mag</unit><ucd>phot.mag;em.opt.B</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>V1mag</name><description>? V magnitude of Star 1 (from Simbad)</description><unit>mag</unit><ucd>phot.mag;em.opt.V</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>SpType1</name><description>Spectral type of Star 1 (from Simbad)</description><ucd>src.spType</ucd><dataType xsi:type="vs:VOTableType" arraysize="7*">char</dataType></column><column><name>Star2</name><description>Companion star (in some cases the companion star is brighter than Star1) (2)</description><ucd>meta.id.assoc</ucd><dataType xsi:type="vs:VOTableType" arraysize="12*">char</dataType></column><column><name>B2mag</name><description>? B magnitude of Star 2 (from Simbad)</description><unit>mag</unit><ucd>phot.mag;em.opt.B</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>V2mag</name><description>? V magnitude of Star 2 (from Simbad)</description><unit>mag</unit><ucd>phot.mag;em.opt.V</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>SpType2</name><description>Spectral type of Star 2 (from Simbad)</description><ucd>src.spType</ucd><dataType xsi:type="vs:VOTableType" arraysize="10*">char</dataType></column><column><name>Vmag</name><description>? V magnitude for Star1+Star2</description><unit>mag</unit><ucd>phot.mag;em.opt.V</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>Bmag</name><description>? V magnitude for Star1+Star2</description><unit>mag</unit><ucd>phot.mag;em.opt.B</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column></table><table><name>J/MNRAS/504/3730/table5</name><description>RGB spectral sensitivity curves</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>lambda</name><description>Wavelength</description><unit>0.1nm</unit><ucd>em.wl</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>stdB</name><description>Spectral sensitivity of standard B band</description><ucd>meta.note</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>stdG</name><description>Spectral sensitivity of standard G band</description><ucd>instr.sensitivity</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>stdR</name><description>Spectral sensitivity of standard R band</description><ucd>stat.stdev</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column></table></schema></tableset></ri:Resource>