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HOME  >  SCIENCE  >  ASTRONOMY

Size comparison: Arcturus vs Sun



Size comparison between the two stars, Arcturus and the Sun.

Arcturus lies in the Spring Triangle asterism. This star is visible in the sky following the extension of the tail of the Big Dipper. It is one of the fastest moving stars in space. From this unusual speed, it is assumed to be part of an ancient small galaxy that merged with the Milky Way. His name means guardian of bears.

Sun
Sun


Object Arcturus Sun
TypeStar, red giantStar, yellow dwarf
Age7.1 billion years4.6 billion years
Diameter35,374,170 km1,392,684 km
Mean radius17,687,080 km696,342 km
Mass2.13 × 1030 kg1.98 × 1030 kg
Surface gravity0.46 m/s²274.4 m/s²
Circumference111.1 million km4.3 million km
Surface area3.93 × 1015 km26.09 × 1012 km2
Volume2.31 × 1022 km31.41 × 1018 km3
Average orbital speed122 km/s1.99 km/s
Sun distance36.7 light years0 km
Luminosity6.49 × 1028 W3.82 × 1026 W
Photosphere temperature4,286 K5,772 K
Distance from the Milky Way center-27,200 light years
Spectral classificationK1.5 IIIFe-0.5G2V
Absolute magnitude-0.314.83
Right ascension14h 15m 39,67s19h 4m 30s
Declination+19° 10′ 56,67″+63.87°


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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