Psi-2

Variable star

Its story

Psi-2 Orionis is a binary system so tight that the two stars deform one another by gravity and produce a grazing eclipse every 2.5 days, an ellipsoidal variable whose brightness shifts by a few hundredths of a magnitude with each turn. At 1,137 light-years within Orion, its blue light set out when the Norman kingdom of Sicily was just taking shape in the Mediterranean.

Constellation: Orion
Apparent magnitude: 4.59
Distance: 1136.6 light years
Coordinates (J2000): RA 81.709° · Dec 3.096°
Catalogue: HIP 25473 · HD 35715

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