Stellar classification



  • X 72
  • Y 138
  • Z 531
→ Sol: 553

Object type

  • Double or multiple star
  • Star
  • Star in Nebula
  • HII region
  • Infra-Red source
  • Interstellar matter
  • Reflection nebula
  • UV-emission source
simbad:* alf Sco


Antares (), also designated Alpha Scorpii (α Scorpii, abbreviated Alpha Sco, α Sco), is on average the fifteenth-brightest star in the night sky, and the brightest star in the constellation of Scorpius. Distinctly reddish when viewed with the naked eye, Antares is a slow irregular variable star that ranges in brightness from apparent magnitude +0.6 to +1.6. Often referred to as "the heart of the scorpion", Antares is flanked by Sigma and Tau Scorpii in the centre of the constellation.

Classified as a red supergiant of spectral type M1.5Iab-Ib, Antares is likely among the largest of known stars. It is the brightest, most massive, and most evolved stellar member of the nearest OB association (the Scorpius–Centaurus Association). Antares is a member of the Upper Scorpius subgroup of the Scorpius–Centaurus Association, which contains thousands of stars with mean age 11 million years at a distance of approximately 170 parsecs (550 ly). Its exact size remains uncertain, but if placed at the centre of the solar system it would reach to somewhere between the orbits of Mars and Jupiter. The mass is calculated to be around 12 times that of the Sun.

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