Magnitude 5.57 | ||
Similar Mu1 Scorpii, VX Sagittarii, IRAS 17163‑3907, RW Cephei | ||
AH Scorpii is a red supergiant variable star located in the constellation Scorpius. It is one of the largest stars known stars at 1,411 R☉.
AH Sco is a semiregular variable star with a main period of 714 days. The total visual magnitude range is 6.5 - 9.6. No long secondary periods have been detected.
Modelling of AH Sco near maximum light has determined an effective temperature of 3,682 K and a luminosity of 330,000 L☉, giving a radius of 1,411 R☉.
AH Sco is a dust-enshrouded red supergiant with SiO, H2O, and OH masers in its oxygen-rich circumstellar material. VLBI measurements of the masers have provided an accurate distance of 2,260 parsecs. The masers were observed to be approaching the star at 13 km/s, indicating overall contraction at around phase 0.55 of the visual variations.