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HD 2942

Triple star system in the constellation Andromeda

Triple star system in the constellation Andromeda

| b-v = 0.99 | u-b = 0.80

HD 2942 is a triple star system in the constellation Andromeda located approximately 170 pc away.

The primary component, a red giant of spectral type K0III, has an apparent magnitude of 6.33, meaning that it is barely visible with the naked eye under good conditions.

The secondary component is much fainter, with an apparent magnitude 11.26, and is located 8.6 arcseconds away. It is a double-lined spectroscopic binary, where two very similar G-type main sequence stars of spectral types G6V and G8V orbit around their common center of mass in 7.489 days. The pair complete an orbit around the primary star every 24,762 years.

Catalogues of stellar multiplicity, like the Washington Double Star Catalog, usually list another component; this star, however, is located much more far away than the other two.

References

References

  1. {{cite DR2. 2857662331549613824
  2. "ADS 455 C".
  3. {{cite Gaia DR3. 2857662129685718912
  4. {{cite constellation. HD 2942
  5. Database entry, Catalogue of Stellar Photometry in Johnson's 11-color system (2002 Ed.), J. R. Ducati, [[Centre de Données astronomiques de Strasbourg. CDS]] ID [http://cdsarc.u-strasbg.fr/viz-bin/cat/II/237 II/237] Accessed on line 2018-12-05.
  6. Database entry, VizieR Online Data Catalog: Updated Multiple Star Catalog (MSC) (Tokovinin 2018), A. Tokovinin, [[Centre de Données astronomiques de Strasbourg. CDS]] ID [http://cdsarc.u-strasbg.fr/viz-bin/cat/J/ApJS/235/6 J/ApJS/235/6] Accessed on line 2018-11-29.
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andromeda-(constellation) henry-draper-catalogue-objects triple-star-systems k-type-giants bright-star-catalogue-objects hipparcos-objects durchmusterung-objects
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