Betelgeuse - α Orionis (alpha Orionis)
Betelgeuse, also designated as α Orionis (alpha Orionis), is a variable and multiple supergiant star in the constellation of Orion.
Betelgeuse visual magnitude is 0.5, making it the 10th brightest star in the sky. Thanks to its high brightness, Betelgeuse is clearly visible when observed from locations with dark skyes, and should be also quite easily visible from light polluted areas.
The table below summarizes the key facts about Betelgeuse:
Celestial coordinates and finder chart of Betelgeuse
Betelgeuse is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of Betelgeuse are provided in the following table:
The simplified sky map below shows the position of Betelgeuse in the sky:
Visibility of Betelgeuse from your location
Digitized Sky Survey image of Betelgeuse
The image below is a photograph of Betelgeuse 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 Betelgeuse is 0.026 arcsec per year in Right Ascension and 0.009 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.
Distance of Betelgeuse from the Sun and relative movement
Betelgeuse is distant 427.26 light years from the Sun and it is moving far from the Sun at the speed of 21 kilometers per second.
Spectral properties of Betelgeuse
Betelgeuse belongs to spectral class M1 and has a luminosity class of I corresponding to a supergiant star.
The red dot in the diagram below shows where Betelgeuse is situated in the Hertzsprung–Russell diagram.
Betelgeuse star system properties
Betelgeuse 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 Betelgeuse double sysyem: