The Binocular Sky


σ Orionis

Constellation: Ori
Object Type: Multiple Star
RA:  5h 38m 45s
Dec:  -2° 35' 53"
Magnitude: 3.8
Recommended minimum aperture: 50mm

Charts for 50mm Binocular (5° aperture circle).   Click on a chart to print it.


σ Orionis is visible to the naked eye as a 4th magnitude star about a degree to the SE of the easternmost belt star (ζ Ori, Alnitak).

What You Should See:

σOri is, in fact, a multiple star consisting of 6 components. You should easily be able to split it into two components with a 1050 binocular and see the blue 6th magnitude E component that is 43 arcsec from the white primary, but more magnification will be needed to separate out the next two components. The final visual split requires the high power of a very good telescope. The presence of a 6th member is inferred from spectroscopic radial velocity measurements.

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