Size of the stars on constellation Orion compared to the sun!?

Question

I need to know the size of mainly the five brightest stars on Orion compared to the sun. Looked on many websites but cant find their size.

Answer 1

You could try wikipedia, with the individual names of the stars.

Begin with Orion to find the names of the stars you want.

Let us say you want:

Betelgeuse
Rigel
Bellatrix
Mintaka and
Saiph
(your choice may vary)

Betelgeuse at
http://en.wikipedia.org/wiki/Betelgeuse
Under details (table on the right) 630 times the radius of the Sun (Ro with a tiny dot in the o); it is a red giant.

Rigel: 70 Ro (a blue giant)
Bellatrix: 5.7 Ro

and so on.
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Radius of our Sun = 696,265 km
Radius of Betelgeuse = 630 * 696,265 km = 438,646,950 km (almost three times the size of Earth's orbit!)

Answer 2

What you need to do is look up the names of the stars in question in a star atlas (try Norton), and then look for information on those (hint: I just had a quick look and found what was needed on Wikipedia). You should also look for information on the size of the sun. From that you will be able to do a comparison.

You don't say exactly what you mean by "size", so I suggest you find the masses of these stars as well as their radii.

Answer 3

If you're refering to the red giants, Rigel and Betelgeuse, they would take up to the orbit of earth or Jupiter. Betelgeuse is bigger. Rigel is a binary star and brighter than Betelgeuse. It is also twice as far away from earth as Betelgeuse.