Alcor - 80 Ursae Majoris

Above the horizon. Circumpolar today

Alt: 20.69° Az: 21.71° Direction: North-North-East

Alcor, also designated as 80 Ursae Majoris , is a variable main-sequence star of spectral class A5 in the constellation of Ursa Major.

Alcor visual magnitude is 4.01. Because of its moderate brightness, Alcor 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 Alcor. The red arrow shows the motion of Alcor during the next 1000 years (1.97 arcmin in Right Ascension and -0.27 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 13h 26m 12s

Declination +54° 51’ 35”

Hour Angle 14h 27m 47s

Sideral Time 03h 54m 00s

J2000

Right Ascension 13h 25m 13s

Declination +54° 59’ 17”

Galactic Coordinates

Galactic Longitude 112.77°

Galactic Latitude 61.47°

Finder Chart

Simplified finder chart for Alcor - 80 Ursae Majoris.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.01

Class Main-sequence

Absolute magnitude 2.03

Spectral Type A5V

Color Index (B-V) 0.16

Temperature 8486K

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

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

Distance, Radial Speed, Proper Motion

Alcor is distant 81.11 light years from the Sun and it is moving towards the Sun at the speed of 9 kilometers per second.

Distance (parsec) 24.88

Distance (light year) 81.11

Radial Speed -9 km/s

Proper Motion RA 0.118 arcsec/y

Proper Motion Dec -0.016"/y

Alternative Designations

Proper Name Alcor

Flamsteed designation 80 Ursae Majoris

Henry Draper Catalogue HD116842

SAO Catalogue SAO28751

Hipparcos Catalogue HIP65477

Durchmusterung Catalogue BD+55 1603

Gliese Catalogue NN 3785

General Catalogue of Variable Stars 6238

Visibility from Your Location

Alcor - 80 Ursae Majoris is circumpolar and transits at 12:31 UTC (altitude: 86.6°)

Set Location

Other stars in Ursa Major