Alcor - 80 Ursae Majoris
Alcor, also designated as 80 Ursae Majoris , is a variable main-sequence star in the constellation of Ursa Major.
Alcor visual magnitude is 4.01. Because of its moderate brightness, Alcor should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.
The table below summarizes the key facts about Alcor:
Celestial coordinates and finder chart of Alcor
Alcor 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 Alcor are provided in the following table:
The simplified sky map below shows the position of Alcor in the sky:
Visibility of Alcor from your location
Location: Greenwich, United Kingdom
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Alcor - 80 Ursae Majoris is circumpolar and transits at 20:44 UTC (altitude: 86.5°)
Digitized Sky Survey image of Alcor
The image below is a photograph of Alcor 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 Alcor is 0.118 arcsec per year in Right Ascension and -0.016 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.
Distance of Alcor from the Sun and relative movement
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.
Spectral properties of Alcor
Alcor belongs to spectral class A5 and has a luminosity class of V corresponding to a main-sequence star.
The red dot in the diagram below shows where Alcor is situated in the Hertzsprung–Russell diagram.