The Catalog of Components of Double and Multiple Stars, or CCDM, is an
astrometric
Astrometry is a branch of astronomy that involves precise measurements of the positions and movements of stars and other celestial bodies. It provides the kinematics and physical origin of the Solar System and this galaxy, the Milky Way.
History ...
star catalogue
A star catalogue is an astronomical catalogue that lists stars. In astronomy, many stars are referred to simply by catalogue numbers. There are a great many different star catalogues which have been produced for different purposes over the year ...
of
double
Double, The Double or Dubble may refer to:
Mathematics and computing
* Multiplication by 2
* Double precision, a floating-point representation of numbers that is typically 64 bits in length
* A double number of the form x+yj, where j^2=+1
* A ...
and
multiple star
A star is a luminous spheroid of plasma (physics), plasma held together by Self-gravitation, self-gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night sk ...
s. It was made by
Jean Dommanget
Jean may refer to:
People
* Jean (female given name)
* Jean (male given name)
* Jean (surname)
Fictional characters
* Jean Grey, a Marvel Comics character
* Jean Valjean, fictional character in novel ''Les Misérables'' and its adaptations
* Jean ...
and
Omer Nys
Omer may refer to:
__NOTOC__
* Omer (unit), an ancient unit of measure used in the era of the ancient Temple in Jerusalem
* The Counting of the Omer (''sefirat ha'omer''), a 49 day period in the Jewish calendar
People
* A variant spelling of the g ...
at the
Royal Observatory of Belgium
The Royal Observatory of Belgium (; ; ) has been situated in the Uccle municipality of Brussels since 1890. It is part of the institutions of the Belgian Federal Science Policy Office (BELSPO).
The Royal Observatory was first established in S ...
in order to provide an input catalogue of stars for the
Hipparcos
''Hipparcos'' was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions and distances of ...
mission. The published first edition of the catalog, released in 1994, has entries for 74,861 components of 34,031 double and multiple stars; the second edition, in 2002, has been expanded to provide entries for 105,838 components of 49,325 double and multiple stars. The catalog lists positions,
magnitude
Magnitude may refer to:
Mathematics
*Euclidean vector, a quantity defined by both its magnitude and its direction
*Magnitude (mathematics), the relative size of an object
*Norm (mathematics), a term for the size or length of a vector
*Order of ...
s,
spectral type
In astronomy, stellar classification is the classification of stars based on their spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a prism or diffraction grating into a spectrum exhibiting the ...
s, and
proper motion
Proper motion is the astrometric measure of changes in the apparent places of stars or other celestial objects as they move relative to the center of mass of the Solar System. It is measured relative to the distant stars or a stable referenc ...
s for each component.
References
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Further reading
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External links
The CCDM, second edition, at VizieR
Astronomical catalogues of stars
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