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Antares

Antares A/B The position of Antares in the Scorpius constellation. Observation data Epoch J2000      Equinox J2000 Constellation Scorpius Right ascension 16h 29m 24s Declination -26° 25' 55? Apparent magnitude (V) +0.96 Characteristics Spectral type M1.5Iab-b / B2.5V U-B color index +1.34 B-V color index +1.83 Variable type LC Astrometry Radial velocity (Rv) –3.4 km/s Proper motion (µ) RA: –12.11 mas/yr Dec.: –23.30 mas/yr Parallax (p) 5.89 ± 1.00 mas Distance approx. 550 ly (approx. 170 pc) Absolute magnitude (MV) –5.28 Details A Mass 12.4 M? Radius 883 R? Surface gravity (log g) 0.1 Luminosity 65,000(bolometric) L? Temperature 3,500 K Rotational velocity (v sin i) 10 km/s B Mass 10 M? Radius 4 R? Other designations Database references SIMBAD data Antares (a Scorpii, a Sco, Alpha Scorpii) is a red supergiant star in the Milky Way galaxy and the sixteenth brightest star in the nighttime sky. (It is sometimes listed as 15th brightest, if the two brighter components of the Capella quadruple star system are counted as one star.) Along with Aldebaran, Spica, and Regulus it is one of the four brightest stars near the ecliptic. Antares is a slow variable star with an average magnitude of +1.09. Cite error: There are tags on this page, but the references will not show without a {{Reflist}} template or a tag; see the help page.
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