Bellatrix - γ Orionis (gamma Orionis)
Bellatrix, also designated as γ Orionis (gamma Orionis), is a variable and double giant star in the constellation of Orion.
Bellatrix visual magnitude is 1.64, making it the 25th brightest star in the sky. Thanks to its high brightness, Bellatrix 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 Bellatrix:
Celestial coordinates and finder chart of Bellatrix
Bellatrix 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 Bellatrix are provided in the following table:
The simplified sky map below shows the position of Bellatrix in the sky:
Visibility of Bellatrix from your location
Digitized Sky Survey image of Bellatrix
The image below is a photograph of Bellatrix 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 Bellatrix is -0.009 arcsec per year in Right Ascension and -0.014 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.
Distance of Bellatrix from the Sun and relative movement
Bellatrix is distant 242.92 light years from the Sun and it is moving far from the Sun at the speed of 18 kilometers per second.
Spectral properties of Bellatrix
Bellatrix belongs to spectral class B2 and has a luminosity class of III corresponding to a giant star.
The red dot in the diagram below shows where Bellatrix is situated in the Hertzsprung–Russell diagram.
Bellatrix star system properties
Bellatrix 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 Bellatrix double sysyem: