hip-80460

Its story

25 Herculis is a white A-type star 243 light-years away, within the vast figure of Hercules that fills an entire quadrant of the northern summer sky. Its atmosphere, close to ten thousand degrees, emits a clean, steady white light, without the golden warmth of cooler stars. Hercules also hosts the globular cluster M13, one of the oldest objects visible from the north, though it lies elsewhere in the constellation.