Phi

Variable star

Its story

Phi Draconis is one of the brightest magnetic chemically-peculiar stars in the sky: its surface holds powerful magnetic fields that pin patches of silicon, iron and chromium, and as it turns every 1.7 days those spots subtly modulate its light. It also belongs to a triple system, with an inner companion tracing an eccentric 128-day orbit. Its modest glow, 303 light-years away, hides an extraordinary physics.

Constellation: Draco
Apparent magnitude: 4.22
Distance: 302.9 light years
Coordinates (J2000): RA 275.189° · Dec 71.338°
Catalogue: HIP 89908 · HD 170000

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