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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:04  
clear_day Transit: 12:06  
SunsetSet: 18:09
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All Constellations » Ursa Major » 

81 Ursae Majoris

Altitude: 42.1°   Azimuth: 310.2°   Direction: North-West

81 Ursae Majoris is a variable hypergiant star in the constellation of Ursa Major.

81 Ursae Majoris visual magnitude is 5.6. Because of its reltive faintness, 81 Ursae Majoris should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of 81 Ursae Majoris is -0.022 arcsec per year in Right Ascension and -0.002 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 81 Ursae Majoris star
DSS2 image of 81 Ursae Majoris. The red arrow shows the motion of 81 Ursae Majoris during the next 10000 years (-3.67 arcmin in Right Ascension and -0.33 arcmin in declination);

Key facts about 81 Ursae Majoris

5.6
Hypergiant

81 Ursae Majoris is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 42.1°
Azimuth: 310.2°
Direction: North-West

Celestial coordinates and finder chart of 81 Ursae Majoris

81 Ursae Majoris is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of 81 Ursae Majoris are provided in the following table:

13h 34m 07s
+55° 20’ 54”
110.49°
60.74°
Ursa Major

The simplified sky map below shows the position of 81 Ursae Majoris in the sky:

Finder chart 81 Ursae Majoris star
Simplified finder chart for 81 Ursae Majoris.

Visibility of 81 Ursae Majoris from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

81 Ursae Majoris is circumpolar and transits at 01:45 UTC (altitude: 86.1°)

Distance of 81 Ursae Majoris from the Sun and relative movement

81 Ursae Majoris is distant 276.98 light years from the Sun and it is moving towards the Sun at the speed of 7 kilometers per second.

84.96 pc
276.98 ly
-7 km/s
-0.022 arcsec/year
-0.002 arcsec/year

Spectral properties of 81 Ursae Majoris

81 Ursae Majoris belongs to spectral class A0 and has a luminosity class of V corresponding to a hypergiant star.

0.95
A0V
10516K

The red dot in the diagram below shows where 81 Ursae Majoris is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 81 Ursae Majoris. Attribution: Richard Powell / CC BY-SA

Alternative designations of 81 Ursae Majoris

81 Ursae Majoris
SAO28803
SAO28803