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Omicron2 Orionis

9 Orionis

Proper NameNone
Bayer DesignationOmicron2 Orionis
Flamsteed Number9 Orionis
HR (BSC)1580
Right Ascension4h 56m 22s
Declination+13° 30' 52"
Distance180 light years
55 parsecs
MagnitudeApparent: +4.07
Absolute: +0.36
Spectral ClassK2-IIIFe-1 orange giant
Optimum VisibilityDecember

An orange star at the northern tip of the arc of stars known as Orion's Shield, Omicron2 Orionis falls between blue Bellatrix in Orion and orange Aldebaran in Taurus. Omicron2 Orionis is a giant star, with nearly twenty times the Sun's diameter, but this is not unusually large for a giant star.

Omicron2 Orionis falls in the northwestern regions of Orion, near the northern end of the formation known as Orion's Shield. Also visible in this image to the northwest of Omicron2 is the much more distant Omicron1 Orionis, a deep red S-type star. Imagery provided by Aladin sky atlas

Omicron2 Orionis forms part of a wide apparent pair with Omicron1 Orionis, which lies nearby in the sky. Actually these two 'Omicron' stars are unrelated: Omicron1 lies more than three times as far from the Solar System as Omicron2, and is actually considerably more luminous (though its greater distance makes it appear slightly fainter than Omicron2 in the skies of Earth).


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