hip-68269

Its story

47 Hydrae is a blue B-type star kindled along the long body of Hydra, the largest constellation in the sky. From 333 light-years away, its magnitude 5.2 hides a body far hotter and more luminous than the Sun, able to ionise the surrounding gas with its ultraviolet output. The light arriving tonight set out in the late 17th century, contemporary with Rømer's first precise measurements of the speed of light.