Pi-1

Hot blue star

Its story

Pi-1 Boötis forms with its partner Pi-2 one of the loveliest doubles in Boötes, splittable with small binoculars. The primary is a rare chemically peculiar HgMn star, with an atmosphere abnormally rich in mercury, manganese and silicon. The companion is a fast-spinning white star, five hundred astronomical units away.

Constellation: Boötes
Apparent magnitude: 4.49
Distance: 305.7 light years
Coordinates (J2000): RA 220.182° · Dec 16.418°
Catalogue: HIP 71762 · HD 129174

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