81 Ursae Majoris

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 skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about 81 Ursae Majoris:

Color of 81 Ursae Majoris ⬤

Magnitude of 81 Ursae Majoris 5.6

Class Hypergiant

VISIBILITY RIGHT NOW 81 Ursae Majoris is above the horizon from Greenwich, United Kingdom [change]. Altitude: 42°.

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:

Right Ascension J2000 13h 34m 07s

Declination J2000 +55° 20’ 54”

Galactic Longitude 110.49°

Galactic Latitude 60.74°

Constellation Ursa Major

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

Simplified finder chart for 81 Ursae Majoris.

Visibility of 81 Ursae Majoris from your location

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

81 Ursae Majoris is circumpolar and transits at 01:29 UTC (altitude: 86.1°)

Digitized Sky Survey image of 81 Ursae Majoris

The image below is a photograph of 81 Ursae Majoris from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). 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.

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);

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.

Distance (parsec) 84.96 pc

Distance (light year) 276.98 ly

Heliocentric radial velocity -7 km/s

Proper Motion RA -0.022 arcsec/year

Proper Motion Dec -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.

Absolute magnitude 0.95

Spectral Type A0V

Color Index (B-V) -0.03

Temperature of 81 Ursae Majoris 10516K

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

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

Alternative designations of 81 Ursae Majoris

Flamsteed designation 81 Ursae Majoris

Henry Draper Catalogue HD118214

SAO Catalogue SAO28803

Hipparcos Catalogue HIP66198

Durchmusterung Catalogue BD+56 1667

General Catalogue of Variable Stars 6319

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Other stars in Ursa Major