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Size comparison between Arcturus, Rigel, S Doradus, Antares, and Betelgeuse Size comparison of Betelgeuse, Mu Cephei, KY Cygni, and V354 Cephei, according to Emily Levesque [112] On 13 December 1920, Betelgeuse became the first star outside the Solar System to have the angular size of its photosphere measured. [36]
The following well-known stars are listed for the purpose of comparison. Antares (α Scorpii A) 680 [70] AD Fourteenth brightest star in the night sky. [71] Widely recognised as being among the largest known stars. [21] Betelgeuse (α Orionis) 640, [72] 764 +116 −62, [73] 782 ± 55 [74] AD & SEIS Tenth brightest star in the night sky. [71]
It was believed that the cutoff for round objects is somewhere between 100 km and 200 km in radius if they have a large amount of ice in their makeup; [1] however, later studies revealed that icy satellites as large as Iapetus (1,470 kilometers in diameter) are not in hydrostatic equilibrium at this time, [2] and a 2019 assessment suggests that ...
This new study finds its body would only reach around two-thirds that distance, roughly 765 times the diameter of the Sun. Based on this size of the stars, astronomers determined Betelgeuse sits ...
English: Comparison of size of Betelgeuse (largest dull-red sphere inside Jupiter's orbit) and R Doradus (red sphere shown inside Earth's orbit) together with the orbits of Mars, Venus and Mercury and the stars Rigel and Aldebaran from Image:1e10m comparison Rigel, Aldebaran, and smaller - antialiased no transparency.png, to scale. The faint ...
The disc and atmosphere of Betelgeuse (ESO) Supergiants have masses from 8 to 12 times the Sun (M ☉) upwards, and luminosities from about 1,000 to over a million times the Sun (L ☉). They vary greatly in radius, usually from 30 to 500, or even in excess of 1,000 solar radii (R ☉). They are massive enough to begin helium-core burning ...
Despite its large size compared to the Sun, Antares is dwarfed by even larger red supergiants, such as VY Canis Majoris, KY Cygni, RW Cephei or Mu Cephei. Antares, like the similarly sized red supergiant Betelgeuse in the constellation Orion, will almost certainly explode as a supernova, [61] probably in 1.0 to 1.4 million years. [10]
It is typically the seventh-brightest star in the celestial sphere, excluding the Sun, although occasionally fainter than Betelgeuse. [30] Rigel appears slightly blue-white and has a B-V color index of −0.06. [32] It contrasts strongly with reddish Betelgeuse. [33]