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Size comparison: Arcturus vs R136a1



Size comparison between the two stars, Arcturus and R136a1.

Arcturus is an old star, its surface gravity is low. It is close to the sun. Its temperature is average. While R136a1 is a very young star, with a fairly high surface gravity, a very high temperature. Its luminosity is much higher.

R136a1
R136a1


Object Arcturus R136a1
TypeStar, red giantStar, Wolf-Rayet
Age7.1 billion years300,000 years
Diameter35,374,170 km49,301,000 km
Mean radius17,687,080 km24,650,500 km
Mass2.13 × 1030 kg4.55 × 1032 kg
Surface gravity0.46 m/s²100 m/s²
Circumference111.1 million km161.1 million km
Surface area3.93 × 1015 km28.26 × 1015 km2
Volume2.31 × 1022 km37.06 × 1022 km3
Sun distance36.7 light years163,000 light years
Luminosity6.49 × 1028 W3.32 × 1033 W
Photosphere temperature4,286 K56,000 K
Spectral classificationK1.5 IIIFe-0.5WN5h
Absolute magnitude-0.31-8.09
Right ascension14h 15m 39,67s5h 38m 42,43s
Declination+19° 10′ 56,67″−69° 06′ 02,2″


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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