Alpha Doradus

Stellar classification



  • X 126
  • Y -111
  • Z -14
→ Sol: 169

Object type

  • Variable Star of alpha2 CVn type
  • Star
  • Double or multiple star
  • Infra-Red source
  • UV-emission source
  • Variable Star
simbad:* alf Dor


Alpha Doradus (Alpha Dor, α Doradus, α Dor) is the brightest star in the southern constellation of Dorado. The distance to this system, as measured using the parallax method, is about 169 light-years (52 parsecs).

This is a binary star system with an overall apparent visual magnitude that varies between 3.26 and 3.30, making this one of the brightest binary stars. The system consists of a subgiant star of spectral type B revolving around a giant star with spectral type A in an eccentric orbit with a period of about 12 years. The orbital separation varies from 2 astronomical units at periastron to 17.5 astronomical units at apastron. The primary, α Doradus A, is a chemically peculiar star whose atmosphere displays an abnormally high abundance of silicon, making this an Si star.

Alpha Doradus has an optical companion, CCDM J04340-5503C, located 77 arcseconds away along a position angle of 94°. It has no physical relation to the other two stars.

This article uses material from the Wikipedia article "Alpha Doradus", which is released under the Creative Commons Attribution-Share-Alike License 3.0.