Epsilon Scorpii

Characteristics

Larawag has a stellar classification of K1 III, which indicates it has exhausted the supply of hydrogen at its core and evolved into a giant star. Its mass is estimated at 1.41 times the mass of the Sun, and its radius is roughly 13 times that of the Sun. Presently it is generating energy through the nuclear fusion of helium at its core, which, considering the star's composition, places it along an evolutionary branch termed the horizontal branch. In the color-magnitude diagram, the star is located in the red clump. The star's outer atmosphere has an effective temperature of 4,522 K, giving it the orange hue of a cool K-type star.

It is classified as a suspected variable star with a magnitude range of 2.23 to 2.35, although a study of Hipparcos photometry showed a variation of no more than 0.01–0.02 magnitudes. It is an X-ray source with a luminosity of (1.5–1.6)×10²⁷ erg/s.

In 2018 it was found that Epsilon Scorpii A has a proper motion companion separated by 14.4", making it a binary star sytstem. The companion, B, is much smaller and fainter than the primary, with 0.26% of the mass, 0.29% the radius, and less than 1% of the Sun's luminosity.