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VizieR

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III/231/catalog The Tycho-2 Spectral Type Catalog (Wright+, 2003)
Main Catalog (351863 rows)
  recno=264789
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ColumnValue  Explain   (UCD)
_RAJ200018 17 36.2454552 "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)
_DEJ2000-34 06 26.143200 "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)
_RAB195018 14 17.3030297 "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)
_DEB1950-34 07 35.803654 "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)
_Glon358.8272715044 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-08.4703597467 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)
264789recno 264789  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

TYC17400  First part of Tycho-2 identifier (meta.id.part;meta.main)
TYC2 1084  Second part of Tycho-2 identifier (meta.id.part;meta.main)
TYC31  Third part of Tycho-2 identifier (meta.id.part;meta.main)
RAJ2000274.40102273 deg (i) Right Ascension, J2000, decimal deg. (pos.eq.ra;meta.main)
DEJ2000-34.10726200 deg (i) Declination, J2000, decimal deg. (pos.eq.dec;meta.main)
VTmag 6.033 mag Tycho-2 VT magnitude (phot.mag;em.opt.V)
BTmag 5.922 mag Tycho-2 BT magnitude (phot.mag;em.opt.B)
r_SpTypemc3  Source of spectral type (Note 2)   (meta.ref)
Namehd 167647  Alternate designation for star (Note 3)   (meta.id)
Dist 0.092 arcsec Distance between Tycho object and spectral type match (Note 4)   (pos.angDistance)
Mag  mag Magnitude from SpType catalog (Note 5)   (phot.mag)
f_Mag*   [VPBX*] Flag indicating type of magnitude (Note 6)   (meta.code.error)
TClassB  Temperature class (Note 7)   (src.spType)
SClass3   Temperature Subclass (Note 7)   (src.spType)
LClass4   Luminosity class in numeric form (Note 7)   (src.spType)
Teff17100 K Effective temperature of the star, based on spectral type (Note G1)   (phys.temperature.effective)
SpType B3/4 IV/V  Spectral Type (Note 1)   (src.spType)

Tycho-2Tycho-2  Display the Tycho-2 (II/259) data (meta.ref)
MKMK  Find out all spectral classifications in the neighbourhood of this position (meta.ref)
SimbadSimbad  ask the Simbad data-base about this object (meta.ref)
  
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