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Size comparison: Betelgeuse vs UY Scuti



Size comparison between two red super giants, Betelgeuse and UY Scuti.

UY Scuti is a star in the constellation Scutum. It is the largest known star in terms of radius. UY Scuti is in fact 1,708 times larger than the sun. Its distance from the earth is 9,500 light years. Its photosphere could encompass the orbit of Jupiter. UY Scuti has started consuming its helium and continues to fuse its hydrogen. Its location deep in the Milky Way suggests that the red super giant is rich in metal.

UY Scuti
UY Scuti


Object Betelgeuse UY Scuti
TypeStar, red supergiantStar, red supergiant
Age8.5 million years5 million years
Diameter1,235,310,708 km2,376,511,200 km
Mean radius617,655,354 km1,188,255,600 km
Mass2.29 × 1031 kg1.7 × 1031 kg
Surface gravity-0.001 m/s²-0.005 m/s²
Circumference1.2 billion km7.46 billion km
Surface area1.5 × 1018 km21.77 × 1019 km2
Volume9.87 × 1026 km37 × 1027 km3
Atmosphere composition hydrogen,
helium
hydrogen,
helium
Crust composition hydrogen,
helium
hydrogen,
helium
Sun distance724 light years9,500 light years
Luminosity5.73 × 1031 W1.3 × 1032 W
Photosphere temperature3,590 K3,365 K
Spectral classificationM1–M2 Ia–abM2-M4Ia-Iab
Right ascension05h 55m 10.29s18h 27m 36.53s
Declination+07° 24′ 25.3″−12° 27′ 58.866″


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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