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VizieR

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III/106/catalog MK Classification of Visual Multiples (Abt, 1981)
MK Classifications of visual multiples (catalog completed with positions) (867 rows)
  recno=399
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ColumnValue  Explain   (UCD)
_RAJ200013 30 46.8000 "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+24 13 57.800 "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)
_RAB195013 28 24.5542 "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+24 29 24.073 "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)
_Glon017.0211292 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+80.6785115 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)
399recno 399  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

McatADS  Multiple star catalog name (ADS, Fin, Kui, B) (meta.id;meta.dataset)
ID 8929  Number in Mcat catalog (meta.id)
m_IDC  Component designation (Note 1)   (meta.code.multip)

Ns 2  Number of stars in the system (meta.number)

NameHD 117555  Name of the star (mainly HD) (meta.id;meta.main)
SpG2III  MK Spectral classification (src.spType)
NoteG2 III (Buscombe 1959MtSOM...3....1B)  Names and selected published types (Note 2)   (meta.note)

RAJ200013 30 46.80 "h:m:s" (i) Right Ascension J2000 (pos.eq.ra;meta.main)
DEJ2000+24 13 57.8 "d:m:s" (i) Declination J2000 (pos.eq.dec;meta.main)

rPosT   [TUM-] Source of position (Note 1)   (meta.ref;pos.frame)
Vmag 8.2 mag Rounded visual magnitude (phot.mag;em.opt.V)

Remarkstrong Ca em  Additional remarks by B. Skiff. (Note 2)   (meta.note)
SimbadSimbad  ask the Simbad data-base about this object (meta.ref.url)
  
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