AH Scorpii

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AH Scorpii
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius
Right ascension 17h 11m 17.02114s[1]
Declination −32° 19′ 30.7132″[1]
Spectral type M4-5Ia-Iab[1]
B−V color index 5.57[1]
Variable type Semiregular
Radial velocity (Rv) -13.40 ± 2.4[1] km/s
Proper motion (μ) RA: -1.37[1] mas/yr
Dec.: -2.37[1] mas/yr
Parallax (π) -0.09[1] mas
Distance ~12,000 ly
Radius 1,287-1,535[2] R
Temperature ~3500 ± 190[2] K
Other designations
AH Scorpii, AN 223.1907, GSC 07365-00527, HD 155161, HIP 84071, 2MASS J17111702-3219308, IRC -30282, IRAS 17080-3215, RAFGL 1927[1]

AH Scorpii is a red supergiant star located in the constellation Scorpius. One of the largest stars known, AH Sco is estimated at 1,287-1,535 solar radii,[2] making it one of the largest stars in its class.

Located approximately 12,000 light-years from Earth, this places it within the Scutum-Centaurus Arm. A luminous red supergiant, it has significant outburst of uncertain variability, at 20% of its luminosity. The size leads to wild estimates because of differences in luminosity, temperature, shrouding gases of dust, and a possibility of a bright companion.

See also[edit]


  1. ^ a b c d e f g h i "SIMBAD basic query result: AH Scorpii". SIMBAD, Centre de Données astronomiques de Strasbourg. Retrieved 13 Nov 2013. 
  2. ^ a b c Arroyo-Torres, B.; Wittkowski, M.; Marcaide, J. M.; Hauschildt, P. H. (2013). "The atmospheric structure and fundamental parameters of the red supergiants AH Scorpii, UY Scuti, and KW Sagittarii". Astronomy & Astrophysics 554: A76. doi:10.1051/0004-6361/201220920.  edit