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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=552
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ColumnValue  Explain   (UCD)
_RAJ200015 40 28.4000 "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+18 40 18.000 "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)
_RAB195015 38 13.1564 "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+18 49 54.978 "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)
_Glon029.8059300 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+50.3544022 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)
552recno 552  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 9742  Number in Mcat catalog (meta.id)
m_IDAB  Component designation (Note 1)   (meta.code.multip)

Ns 1  Number of stars in the system (meta.number)

NameHD 139939  Name of the star (mainly HD) (meta.id;meta.main)
SpAm(kA3hA5VmF0)  MK Spectral classification (src.spType)
Note   Names and selected published types (Note 2)   (meta.note)

RAJ200015 40 28.40 "h:m:s" (i) Right Ascension J2000 (pos.eq.ra;meta.main)
DEJ2000+18 40 18.0 "d:m:s" (i) Declination J2000 (pos.eq.dec;meta.main)

rPosT   [TUM-] Source of position (Note 1)   (meta.ref;pos.frame)
Vmag 7.6 mag Rounded visual magnitude (phot.mag;em.opt.V)

Remark0".5 cpm pair  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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