Bayer designation Alpha Scorpii (abbreviated to α Scorpii or α Sco), is the seventeenth brightest star in the nighttime sky[a] and the brightest star in the constellation Scorpius, and is often referred to as "the heart of the scorpion". Along with Aldebaran, Regulus, and Fomalhaut, Antares comprises the group known as the 'Royal stars of Persia'. It is one of the four brightest stars near the ecliptic.
Nicholas van Rijn gives Sandra Tamarin a lift in his private spaceship from Antares to Earth. Before that, the imperialist Borthudians had attacked and boarded any ship that passed through the volume of space claimed by them, thus making it barely profitable for League companies to trade along the route between Earth and Antares.
Since Antares had appeared at least twice in the van Rijn series, I considered it appropriate to google both for an image and for astronomical data.