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Proper NameNone
Bayer DesignationPi5 Orionis
Flamsteed Number9 Orionis
HR (BSC)1567
HD31237
ConstellationOrion
Right Ascension4h 55m 5s
Declination+2° 27' 47"
Distancec.1,300 light years
c.400 parsecs
MagnitudeApparent: +3.7
Absolute: -4.4
Spectral ClassB3III Blue Giant
Optimum VisibilityDecember
NotesThe form of the main blue giant is deformed by the close orbit of its binary companion, a blue dwarf star. This deformation causes the apparent brightness of the entire system to shift by more than 0.1 magnitudes as it rotates over a period of several days.

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