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.

Object	Rigel	Sirius A
Type	Star, blue supergiant	Star, main sequence
Age	8 million years	242 million years
Diameter	109,882,767 km	2,382,882 km
Mean radius	54,941,383 km	1,191,441 km
Mass	4.15 × 1031 kg	3.96 × 1030 kg
Orbital period	10 days	50 years
Surface temperature (average)	12,100 K 11,826 °C 21320 °F	9,940 K 9,666 °C 17,432 °F
Surface gravity	0.56 m/s²	213.8 m/s²
Atmosphere composition	hydrogen, helium, magnesium	hydrogen, helium
Sun distance	864.3 light years	8.6 light years
Luminosity	4.58 × 1026 W	9.7 × 1027 W
Metallicity	-0.06	0.5
Spectral classification	B8 Ia	A0mA1 Va
Absolute magnitude	-7.84	1.42
Right ascension	05h 14m 32.27210s	06h 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.