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Size comparison: Betelgeuse vs Rigel



Size comparison between two super giants, Betelgeuse and Rigel.

We notice that these two stars have a similar age. Betelgeuse is clearly bigger, but not more massive. The two objects are very far from the sun. Rigel is much less bright. Their nature is very different. Betelgeuse is richer in metal; Rigel's surface is very rich in carbon, nitrogen and oxygen. The star Rigel is expected to end up as a Type II supernova.

Rigel
Rigel


Object Betelgeuse Rigel
TypeStar, red supergiantStar, blue supergiant
Age8.5 million years8 million years
Diameter1,235,310,708 km109,882,767 km
Mean radius617,655,354 km54,941,383 km
Mass2.29 × 1031 kg4.15 × 1031 kg
Surface temperature
(average)
3,500 K
3,227 °C
5,840 °F
12,100 K
11,826 °C
21320 °F
Surface gravity-0.001 m/s²0.56 m/s²
Atmosphere composition hydrogen,
helium
hydrogen,
helium,
magnesium
Sun distance724 light years864.3 light years
Luminosity5.73 × 1031 W4.58 × 1026 W
Metallicity0.05-0.06
Spectral classificationM1–M2 Ia–abB8 Ia
Absolute magnitude-5.85-7.84
Right ascension05h 55m 10.29s05h 14m 32.27210s
Declination+07° 24′ 25.3″−08° 12′ 05.8981″


Note: if one of the objects is not visible, it just means that it is too tiny to be displayed compared to the other one.


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