μ Orionis (mu Orionis)

Above the horizon. Rise: 4:40 | Tran: 11:09 | Set: 17:34

Alt: 63.17° Az: 155.95° Direction: South-South-East

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.

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

Apparent

Right Ascension 06h 03m 47s

Declination +09° 38’ 44”

Hour Angle 23h 16m 59s

Sidereal Time 05h 20m 46s

J2000

Right Ascension 06h 02m 22s

Declination +09° 38’ 51”

Galactic Coordinates

Galactic Longitude 198.68°

Galactic Latitude -6.31°

Finder Chart

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Finder chart for μ Orionis (mu Orionis).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.12

Class Main-sequence

Absolute magnitude 0.78

Spectral Type A2V

Color Index (B-V) 0.16

Temperature 8486K

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

Main star magnitude 4.12

Secondary star magnitude 5.92

Magnitude difference 1.8

Separation 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.

Distance (parsec) 46.53

Distance (light year) 151.70

Radial Speed 45 km/s

Proper Motion RA 0.015 arcsec/y

Proper Motion Dec -0.028"/y

Alternative Designations

Bayer designation μ Orionis
(mu Orionis)

Flamsteed designation 61 Orionis

Henry Draper Catalogue HD40932

SAO Catalogue SAO113389

Hipparcos Catalogue HIP28614

Durchmusterung Catalogue BD+09 1064

General Catalogue of Variable Stars 2792

Aitken Double Star Catalogue ADS4617

Visibility from Your Location

Today's μ Orionis (mu Orionis) rise, transit and set times from Ōyama, Japan are the following (all times relative to the local timezone Asia/Tokyo):

Azimuth: 80.4° RISE 4:40

Max altitude: 65.0° TRANSIT 11:09

Azimuth: 279.6° SET 17:34

Name:	Ōyama, Japan
Latitude:	34° 36' 13.0" N
Longitude:	138° 13' 1.2" E
Timezone:	Asia/Tokyo

Set Location

Other stars in Orion