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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 7:30 
Transit: 12:14 
Sunset: 16:58
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All Constellations » Orion » 

σ Orionis (sigma Orionis)

Above the horizon.  Rise: 14:46 | Tran: 20:31 | Set: 2:20
Alt: 23.51°   Az: 231.27°   Direction: South-West

σ Orionis is a multiple main-sequence star of spectral class O9 in the constellation of Orion.

σ Orionis visual magnitude is 3.81. Because of its moderate brightness, σ Orionis is easily visible to the naked eye from locations with dark skies, while it might be barely visible, or not visible at all, from light-polluted skies.

Image of σ Orionis (sigma Orionis) star
DSS2 image of σ Orionis. The red arrow shows the motion of σ Orionis during the next 100000 years (3.33 arcmin in Right Ascension and 1.67 arcmin in declination);

Celestial Coordinates

Apparent

05h 40m 00s
-02° 35’ 14”
03h 02m 55s
08h 42m 56s

J2000

05h 38m 44s
-02° 36’ 00”

Galactic Coordinates

206.82°
-17.34°

Finder Chart

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Finder chart for σ Orionis (sigma Orionis).

Magnitude, Color, Spectral Class

3.81
Main-sequence

-3.92
O9V
14633K

The red dot in the diagram below shows where σ Orionis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of σ Orionis. Attribution: Richard Powell / CC BY-SA

Star System Properties

σ Orionis is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the σ Orionis double sysyem:

3.81
4.61
0.8
0.2 arcsec

Distance, Radial Speed, Proper Motion

σ Orionis is distant 1,147.89 light years from the Sun and it is moving far from the Sun at the speed of 29 kilometers per second.

352.11
1,147.89
29 km/s
0.002 arcsec/y
0.001"/y

Alternative Designations

σ Orionis
(sigma Orionis)
SAO132406
SAO132406

Visibility from Your Location

Today's σ Orionis (sigma Orionis) rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 92.6°
Max altitude: 35.9°
Azimuth: 267.4°