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public LocationGreenwich, UK
Sunrise: 5:14 
Transit: 13:06 
Sunset: 20:58
sunny   (Daytime)   What's Visible Now?
All Constellations » Orion » 

μ Orionis (mu Orionis)

Above the horizon.  Rise: 4:06 | Tran: 10:53 | Set: 17:40
Alt: 39.10°   Az: 227.61°   Direction: South-West

μ Orionis is a variable and multiple main-sequence star of spectral class A2 in the constellation of Orion.

μ Orionis visual magnitude is 4.12. Because of its moderate brightness, μ 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 μ Orionis (mu Orionis) star
DSS2 image of μ Orionis. The red arrow shows the motion of μ Orionis during the next 10000 years (2.50 arcmin in Right Ascension and -4.67 arcmin in declination);

Celestial Coordinates


06h 03m 44s
+09° 38’ 44”
02h 22m 12s
08h 25m 56s


06h 02m 22s
+09° 38’ 51”

Galactic Coordinates


Finder Chart

Finder chart μ Orionis (mu Orionis) star
Simplified finder chart for μ Orionis (mu Orionis).

Magnitude, Color, Spectral Class



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

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

Star System Properties

μ 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 μ Orionis double sysyem:

0.3 arcsec

Distance, Radial Speed, Proper Motion

μ Orionis is distant 151.70 light years from the Sun and it is moving far from the Sun at the speed of 45 kilometers per second.

45 km/s
0.015 arcsec/y

Alternative Designations

μ Orionis
(mu Orionis)

Visibility from Your Location

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

Azimuth: 80.4°
Max altitude: 48.2°
Azimuth: 279.6°