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I/211 CCDM (Components of Double and Multiple stars) (Dommanget+ 1994)
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Catalogue of the Components of Double, Multiple stars (CCDM) first edition
Dommanget J., Nys O.
<Comm. Obs. R. Belgique, Ser. A, N. 115 (1994)>
=1994CoORB.115....1D
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ADC_Keywords: Stars, double and multiple
Description:
The introduction to this catalogue has been the subject of a
publication in the "Communications de l'Observatoire Royal de
Belgique" (Serie A, number 115). Detailed are: its origins, its
aims, its realization, the search of identifiers, the compilation
of astrometric data and the related problems as well as the
fundamental ties between the CCDM and the HIPPARCOS INPUT
CATALOGUE (HIC). It also contains a complete bibliography of the
referred papers. The contents of the general catalogue (63,463
systems) is also described as well as the conditions of its
availability to the astronomical community and the projects
underway for the next edition. For all these items, the user is
invited to refer to this publication because hereafter only the
format and the contents of the catalogue follow.
To identify the systems and their components, we adopted the clever
numbering process of the authors of the INDEX consisting in
combining the right ascension and declination, respectively
limited to 0.1 minute of time and to 1 minute of arc. In order to
distinguish the CCDM numbers from the INDEX numbers - in addition
to their different equinox: 2000 for the CCDM and 1900 for the INDEX
- we adopted the signs + and - instead of the letters N and S for
separating the coordinates. Consequently, in the INDEX and in the
CCDM, one entry is devoted to a same system but the contrary to the
INDEX, where a sub-entry is assigned to each group of two components,
whatever the multiplicity of the system may be, the CCDM allows one
sub-entry and thus one record per component. The present edition
contains only the 34,031 systems (table below, part I) for which
an accurate position has been found for at least one component. The
catalogue extends thus much over the sample of the somewhat 14,000
systems finally retained for the HIPPARCOS INPUT CATALOGUE and
assembled in its Annex 1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
ccdm.doc 110 460 Documentation
catalog.dat 132 74861 The Catalogue
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See also:
I/196: Hipparcos Input Catalogue (Turon+ 1993)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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2- 11 A10 --- CCDM (Catalogue of the Components of the
Double and Multiple stars) number (1)
12 A1 --- rComp *[B-Z?] Reference component (blank if A)
13 A1 --- Comp *[A-Z?] Concerned component
14 A1 --- Note1 [*] *=orbit in Dommanget's personal cat. (2)
15 A1 --- Note2 [@] @ = astrometric binary
16- 22 A7 --- Disc Name of the pair (Discoverer and Number)
24- 30 F7.2 s dRAs ? Remainder of RA in second of time;
31- 37 F7.1 arcsec dDEs ? Remainder of DE in arcsecond;
39- 40 I2 --- r_dRAs ? Source code for positions (3)
42- 45 I4 yr Year ? Year of measured relative position
47- 49 A3 deg theta Position angle (degrees) (4)
50- 55 F6.1 arcsec rho ? angular separation of Comp along theta
57- 58 I2 --- Obs ? for A component: number of components;
other component: number of measurements
60- 63 F4.1 mag Vmag ? magnitude
65- 66 A2 --- Sp spectrum
67 A1 --- pmNote *[*@$] Origin of the proper motion
68- 72 I5 mas/yr pmRA ? annual proper motion in 0"001
73- 77 I5 mas/yr pmDE ? annual proper motion in 0"001
78- 87 A10 --- DM First identification = DM
(Harvard system) (5)
88- 97 A10 --- Name2 Second identification (5)
99-104 A6 --- HD HD designation
105-106 A2 --- m_HD [/0-9 ] second HD (Example: 131843/4)
107-112 A6 --- ADS/BDS ADS number (A) or BDS number (B)
113 A1 --- m_ADS/BDS [a] suffix (a) to an inserted ADS number
114 A1 --- n_IDS [*] The * means that the Index number is
built for new component or system;
115-125 A11 --- IDS Uncorrected Index designation (1976.5)
(equinox 1900) and identification letter;
127-132 I6 --- HIC ? Hipparcos Input Catalogue (Turon et al.)
number
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Note (1): The CCDM number is made with RA(2000) limited to 0.1 minute of
time (HHMMm) and Dec(2000) limited to 1 minute of a degree (+DDMM).
Full details about the construction of the CCDM number are
given in the publication.
Note (2): The personal catalogue of J.Dommanget (1982; partially updated
to 1994)
Note (3): See the document file, part III
Note (4): The following letters are sometimes used to indicate an approximate
location of the secondary component:
'N' (to the North)
'NF'(to the North and following) (first quadrant)
'F' (following)
'SF'(to the South and following) (second quadrant)
'S' (to the South)
'SP'(to the South and preceding) (third quadrant)
'P' (preceding)
'NP'(to the North and preceding) (fourth quadrant)
Note (5): .0 = BD .6 = AGK2/3
.2 = CD .8 = SAO
.4 = CPD
The suffixes "a" and "b" following some DM designations
appear in place of the dot.
Note on pmNote:
*: not the pm from the Index;
@: pm from the HIC;
$: pm = pm(B/A);
Note on Comp and rComp:
In one record there appear '?' signs for (CCDM#=) 07366-1428
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History:
* 08-Dec-1994: File prepared by J. Dommanget [Obs. Royal Bruxelles]
F. Ochsenbein and J.L. Halbwachs [CDS]
* 14-Nov-1996: Editing of the original ReadMe (1994) was done at the NASA/ADC.
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(End) J. Dommanget [Obs. Royal Bruxelles] [NASA/ADC] 14-Nov-1996