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The simple answer is by looking at them.
The technical answer is by analysing their bolometric luminosity with a bolometer.
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∙ 14y ago
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Which star is brighter Betelgeuse or Rigel?
Rigel is brighter than Betelgeuse.
Which is larger Rigel or Betelgeuse?
Betelgeuse is much larger than Rigel.
How big is Betelgeuse compared to Rigel?
Betelgeuse is much larger than Rigel. Betelgeuse has a radius about 15 times the radius of Rigel, and a volume of about 3500 times Rigel.
Why does rigel shine as brightly as betelgeuse even though rigel is much smaller than betelgeuse?
Simply because Rigel is hotter.
Why does Rigel shine as bright as Betelgeuse even though Rigel is much smaller than Betelgeuse?
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How many times larger is Betelgeuse in terms of diameter than Rigel?
Betelgeuse is around 10 times greater in diameter than Rigel.
Is Betelgeuse hotter than Rigel?
No, Rigel is hotter. Rigel is a blue star with a temperature of about 11,000 K, and Betelgeuse is a red star with a temperature of about 3,500 K.
Which is brighter Sirius or Rigel?
Sirius has a luminosity of: 25.4 while Rigel has a luminosity of: 66,000 Making Rigel brighter than Sirius.
Does rigel have a greater magnitude than sirus?
No, which means that Rigel is brighter.
How can you tell if Rigel or Betelgeuse is hotter?
Rigel is hotter by a long way with a temperature of 11,000 Kelvin, whereas Betelgeuse is a cool 3,500 Kelvin
Is Rigel brighter than Aldebaran?
yes
Why does the sun seem brighter than Rigel?
The sun appears brighter than Rigel does because it is much closer to us by a factor of about 50 million.
