Sig

Variable star

Its story

σ Geminorum is an inseparable pair 125 light-years away, in the Twins. Its visible component is an orange giant ten times the Sun's size, mottled with vast dark spots like our sunspots but on another scale. It rotates in tidal lock with an invisible companion every 19.6 days: an RS Canum Venaticorum variable whose face slowly shifts as it dances.

Constellation: Gemini
Apparent magnitude: 4.23
Distance: 125.1 light years
Coordinates (J2000): RA 115.828° · Dec 28.884°
Catalogue: HIP 37629 · HD 62044

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