J/A+AS/124/75       Multiple star catalogue (MSC) (Tokovinin 1997)
================================================================================
MSC - a catalogue of physical multiple stars
       Tokovinin A.A.
       VizieR DOI : 10.26093/cds/vizier.22350006
       Bibcode : 2018ApJS..235....6T 
       J/ApJS/235/6
      
================================================================================
ADC_Keywords: Stars, double and multiple ; Positional data ; Radial velocities
Keywords: binaries: general - catalog

Description:

    Data on  5719 stellar systems  of multiplicity  3 to 7  are given.
    These   systems  are   physical   and,   with  little   exception,
    hierarchical.   For  grades 4  (N=2669)  and  5 (N=2241),  orbital
    periods are known  or estimated, while for 809 systems  of grade 3
    some periods remain unknown.   Additionally, 760 systems of grades
    1  and  2  (refuted  or unconfirmed  hierarchies)  are  given  for
    reference.  A hierarchical system  consists of several "elementary
    binaries". For each binary, the  orbital period and separation are
    given,  as well  as  components' magnitudes,  spectral types,  and
    estimated masses.  Orbital elements are also given when available.
    The present version  of the catalogue is the latest  update of the
    original  1997 publication  (Tokovinin, 1997-1999,  J/A+AS/124/75)
    and its continuation in 2018ApJS..235....6T.

File Summary:
--------------------------------------------------------------------------------
  FileName     Explanations
--------------------------------------------------------------------------------
ReadMe         This file
comp.tsv       Catalog of Physical Multiple Stars (components)
sys.tsv        Individual subsystems
orb.tsv        Orbital elements
notes.tsv      Notes

--------------------------------------------------------------------------------

Byte-by-byte Description of file: comp.tsv 
--------------------------------------------------------------------------------
   Bytes Format Units   Label     Explanations
--------------------------------------------------------------------------------
   1- 10  A10   ---     WDS       WDS (J2000) (1)
  12- 21  F10.6 deg     RAdeg     Right Ascension 2000 (degrees)
  23- 32  F10.6 deg     DEdeg     Declination 2000 (degrees)
  34- 41  F8.2  mas     plx       Parallax
  43- 46  A4    ---     refpar    Reference code for parallax (2)
  48- 54  F7.1 mas/yr   PMRA      Proper motion in RA
  56- 62  F7.1 mas/yr   PMDE      Proper motion in Dec
  64- 69  F6.1 km/s     RV        Radial velocity
  71- 72  A2   ---      Comp      Component label
  74- 80  F7.1 arcsec   Sep       Separation from main component
  82- 89  A8   ---      Sp        Spectral type
  91- 96  I6   ---      HIP       Hipparcos number
  98-103  I6   ---      HD        HD number
 105-109  F5.2 mag      Bmag      B-band magnitude
 111-115  F5.2 mag      Vmag      V-band magnitude
 117-121  F5.2 mag      Imag      I_C-band magnitude
 123-127  F5.2 mag      Jmag      J-band magnitude
 129-133  F5.2 mag      Hmag      H-band magnitude
 135-139  F5.2 mag      Kmag      K-band magnitude
 141-142  I2   ---      Ncomp     Number of components
 144-144  I1   ---      Gr        Grade (3)
 146-195  A50  ---      Id        Other identifiers      
--------------------------------------------------------------------------------
Note (1): The WDS index may differ from the index given in
the Washington Double Stars Catalog for the same system.

Note (2): Parallax code: HIP,HIP1,HIP2 - trigonometric Hipparcos
     	  	         Gaia - Gaia DR1 parallax
			 DR2 - Gaia DR2 parallax
			 DR3 - Gaia DR3 or eDR3 parallax
			 DR3N - Gaia DR3+NSS parallax
                         ptm - photometric parallax estimate
                         dyn - dynamical from visual orbit
                         orb - orbital for visual/SB2 orbit
                         bib - taken from literature
			 guess - crude guess

Note (3): Grades have the following meaning
     0 - no grade or secondary component
     1 - not a triple system
     2 - uncertain triple or very wide (period >2Myr)
     3 - some undefined period or poorly known distance
     4 - at least triple, all periods defined
     5 - At least one orbit, distance known within 10%

Note (4): Unknown numerical parameters have zero value in all tables.

--------------------------------------------------------------------------------

Byte-by-byte Description of file: sys.tsv
--------------------------------------------------------------------------------
   Bytes Format Units   Label     Explanations
--------------------------------------------------------------------------------
   1- 10  A10   ---     WDS       WDS(J2000)
  12- 14  A3    ---     Primary   Primary component label
  16- 18  A3    ---     Secondary Secondary component label
  20- 22  A3    ---     Parent    Parent label (1)
  24- 31  A6    ---     Type      Observing technique/status (2)
  33- 42  F10.4 n/a     P         Orbital period 
  44- 44  A1    ---     Punit     [kydM] unit of period 
  46- 53  F8.3  ---     Sep       Separation or semimajor axis
      55  A1    ---     Sunit     ['"m] Units of separation
  57- 61  F5.1  deg     PA        Position angle
  63- 67  F5.2  mag     Vmag1     V-magnitude of the primary
  69- 73  A5    ---     SP1       Spectral type of the primary
  75- 79  F5.2  mag     Vmag2     V-magnitude of the secondary
  81- 85  A5    ---     SP2       Spectral type of the secondary
  87- 92  F6.2  solMass Mass1     Mass of the primary
      94  A1    ---     MCode1    Mass estimation code for primary (3)
  96-101  F6.2  solMass Mass2     Mass of the secondary
     103  A1    ---     MCode2    Mass estimation code for secondary (3)
 105-134  A20   ---     Comment   Comment
--------------------------------------------------------------------------------
Note (1): The "Parent" points to a component identifier in a
     higher-level system to which the current system belongs and thus
     codes the hierarchy by reference. Two special symbols are used:
       * means root (system at the highest hierarchical level)
       t means "Trapezium"-type, apparently non-hierarchical

Note (2): Discovery/observing status codes, comma-separated:
           c - wide, possibly C.P.M. system
           C - C.P.M. system (sep.>3");
          The following small letters give the criteria used to establish CPM:
               h - physical according to hypothetical parallax,
               r - common radial velocities,
               p - photometric distances or common parallax;
               m - common proper motion.
           v - close visual or interferometric system (sep.<3")
           V - visual system with computed orbit
           a - astrometric system (perturbed motion suspected)
           A - astrometric orbit for invisible companion is computed
           s - possibly spectroscopic system (var. RV or composite sp.)
           S1, S2 - spectroscopic system with computed orbit, single- or double-lined
           o - occultation binary
           E - eclipsing binary with known period
           E* - eclipse time variation
           e - eclipsing binary, period not known
	   X - optical or spurious (qualifiers h,r,m clarify why optical)
Note (3): Mass codes:
          r - given in the original publication
          v - estimated from absolute V magnitude
          k - estimated from absolute K or H magnitude
          a - estimated from spectral type or B-V color index from Allen's tables
          s - sum of masses for the sub-system(s)
          q - estimated from primary mass and mass ratio of SB2 or astrometric
          m - minimum secondary mass for SB1
--------------------------------------------------------------------------------


Byte-by-byte Description of file: orb.tsv
--------------------------------------------------------------------------------
   Bytes Format Units   Label     Explanations
--------------------------------------------------------------------------------
   1- 10  A10   ---     WDS       WDS(J2000)
  12- 19  A7    ---     System    Primary,Secondary
  21- 32  F12.4 ---     Period    Period (See Punit for the units)
  34- 43  F10.4 ---     T         Periastron epoch (Besselian year or JD-2400000)
  45- 50  F6.3  ---     e         Eccentricity
  52- 59  F8.4  arcsec  a         Semimajor axis 
  61- 66  F6.2  deg     Node      P.A. of the ascending node
  68- 73  F6.2  deg     LongP     Longitude of periastron
  75- 80  F6.2  deg     Incl      Inclination
  82- 87  F6.2  km/s    K1        Primary semi-amplitude
  89- 94  F6.2  km/s    K2        Secondary semi-amplitude
  96-103  F8.2  km/s    V0        Center of mass velocity
     105  A1    ---     Nodeflag  Component to which the node refers
     107  A1    ---     Punit     [yd] Units of period
 109-138  A30   ---     Note      Note (may include bibcode)   
--------------------------------------------------------------------------------

Byte-by-byte Description of file: notes.tsv
--------------------------------------------------------------------------------
   Bytes Format Units   Label     Explanations
--------------------------------------------------------------------------------
   1- 10  A10   ---     WDS       WDS(J2000)
  12- 91  A80   ---     Rem       Remark text
  93-111  A19   ---     Bib       Bibcode or reference

Acknowledgements: Andrei Tokovinin <andrei.tokovinin@noirlab.edu>

History:
  * 22-Mar-2017 First version posted 
  * 07-Feb-2023 Previous update
  * 01-Jan-2024 Last update

================================================================================
(End)
