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Its Bayer designation is α Orionis, Latinised to Alpha Orionis and abbreviated Alpha Ori or α Ori. [ 19 ] With a radius between 640 and 764 times that of the Sun, [ 14 ] [ 11 ] if it were at the center of our Solar System , its surface would lie beyond the asteroid belt and it would engulf the orbits of Mercury , Venus , Earth , and Mars .
Betelgeuse and Bellatrix are south-east and south-west of the formation, forever cast as Alpha and Gamma by Bayer, they are near the top of Orion and in myth represent the hunter's shoulders. Sharpless 264 , also known as the Lambda Orionis Ring , is a molecular cloud and H II region , which can be seen in the northern region of the Orion ...
Star system ← → ← → Median ... Betelgeuse (Alpha Orionis) 408 – 548 +90 −49: 1: M1–M2 Ia–ab +0.50: The closest red supergiant star and one of the ...
The following is a list of stars with resolved images, that is, stars whose images have been resolved beyond a point source. Aside from the Sun , observed from Earth , stars are exceedingly small in apparent size, requiring the use of special high-resolution equipment and techniques to image.
Bellatrix is the third-brightest star in the constellation of Orion, positioned 5° west of the red supergiant Betelgeuse (Alpha Orionis). It has the Bayer designation γ Orionis, which is Latinized to Gamma Orionis. With a slightly variable magnitude of around 1.6, it is typically the 25th-brightest star in the night sky.
An example is Sigma Orionis, for σ Ori. For components of multiple star system, the convention is to follow the system name by a capital letter. Thus, Alpha Centauri A and Alpha Centauri B. Exoplanets typically use a lower case letter, such as Epsilon Eridani b.
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Although Betelgeuse has the Bayer designation Alpha Orionis (α Orionis / α Ori), it is most often the second brightest star in the constellation Orion behind α; Rigel (Beta Orionis) is usually brighter (Betelgeuse is a variable star and is on occasion brighter than Rigel).