Zeta¹ Scorpii

Zeta¹ Scorpii forms a optical double star with Zeta² Scorpii (or Grafias) to its immediate east. Though they share a 'Zeta' designation, these stars are entirely unrelated, and widely separated in space. Zeta¹ Scorpii is an immensely luminous supergiant (estimated to be nearly seven thousand times more luminous than the Sun), but very considerably farther from the Solar System. Its apparent neighbour Zeta² Scorpii is a much closer giant star, still far more luminous than the Sun, but emitting only a fraction of the energy of distant Zeta¹. Imagery provided by Aladin sky atlas