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VizieR

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II/50/ubv Photometric Standard Stars (Cousins 1971)
Photometric standard stars (tables II and IV of paper) (2036 rows)
  recno=681
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ColumnValue  Explain   (UCD)
_RAJ200017 10 22.6873 "h:m:s" Right ascension (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.ra)
_DEJ2000-15 43 29.677 "d:m:s" Declination (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.dec)
_RAB195017 07 30.5925 "h:m:s" Right ascension (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.ra)
_DEB1950-15 39 48.279 "d:m:s" Declination (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.dec)
_Glon006.7214299 deg Galactic longitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lon)
_Glat+14.0078338 deg Galactic latitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lat)
681recno 681  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

HD155125  HD identifier of the star (Cat. III/135) (meta.id;meta.main)
m_HD    [/] '/' indicates a blend with next HD number (meta.code.multip)
Vmag 2.430 mag Magnitude in Johnson V filter (phot.mag;em.opt.V)
u_Vmag    [:)] doubtful value (:), variable value ()) (meta.code.error)
e_Vmag 0.010 mag Dispersion on Vmag (stat.error;phot.mag;em.opt.V)
w_Vmag 4.00   Weight on Vmag (stat.weight)
B-V 0.055 mag Mean Johnson B-V colour index (phot.color;em.opt.B;em.opt.V)
u_B-V    [:)] doubtful value (:), variable value ()) (meta.code.error;phot.color;em.opt.B)
e_B-V 0.007 mag Dispersion on B-V (stat.error;phot.color;em.opt.B)
w_B-V 3.20   Weight on B-V (stat.weight)
U-B 0.08 mag Mean Johnson U-B colour index (phot.color;em.opt.U;em.opt.B)
u_U-B    [:)] doubtful value (:), variable value ()) (meta.code.error;phot.color;em.opt.U)
w_U-B 2.50   Weight on U-B (quarters assigned) (stat.weight)
S    [CA*] Source of U-B value: C=Cape only, A=Catalina station (Arizona), *=discordant values. (meta.ref;phot.color;em.opt.U)
Notes   Remarks (variable star name, binarity) (meta.note)

SimbadSimbad  ask the Simbad data-base about this object
_RA257.59453 deg (i) Right Ascension (J2000) from SIMBAD (not part of the original data) (pos.eq.ra;meta.main)
_DE-15.72491 deg (i) Declination (J2000) from SIMBAD (not part of the original data) (pos.eq.dec;meta.main)
  
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