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HOME  >  SCIENCE  >  ASTRONOMY

Size comparison: Rigel vs Sirius A



Size comparison between the two stars, Rigel and Sirius A.

Rigel is the seventh brightest star in the night sky. It is a blue supergiant, it is 40,000 times brighter than the Sun and 79 times larger.

Sirius A is the largest star in the Alpha Canis Majoris system. It is the brightest star in the sky, after the Sun. It is a white star. It is also the closest star to the Sun after Proxima Centauri.

Sirius A
Sirius A


Object Rigel Sirius A
TypeStar, blue supergiantStar, main sequence
Age8 million years242 million years
Diameter109,882,767 km2,382,882 km
Mean radius54,941,383 km1,191,441 km
Mass4.15 × 1031 kg3.96 × 1030 kg
Orbital period10 days50 years
Surface temperature
(average)
12,100 K
11,826 °C
21320 °F
9,940 K
9,666 °C
17,432 °F
Surface gravity0.56 m/s²213.8 m/s²
Atmosphere composition hydrogen,
helium,
magnesium
hydrogen,
helium
Sun distance864.3 light years8.6 light years
Luminosity4.58 × 1026 W9.7 × 1027 W
Metallicity-0.060.5
Spectral classificationB8 IaA0mA1 Va
Absolute magnitude-7.841.42
Right ascension05h 14m 32.27210s06h 45m 08.917s
Declination−08° 12′ 05.8981″−16° 42′ 58.02″


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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