List of stellar angular diameters

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Following is a list of stellar angular diameters. In astronomy the sizes of stars are often given in terms of their angular diameter as seen from Earth, rather than their actual sizes. Since these angular diameters are typically small, it is common to present them in arcseconds.


Star Angular Diameter
R Doradus 0.054" ± 0.005" (1250 nm) [1]
(855 nm)
Betelgeuse 0.054" (720 nm) [2]
0.265" ± 0.005" (400 nm) [3]
Aldebaran 0.021"
Name Type dist. diameter Size
Alpha Arietis K2III 65.9 ly 0.00699 14.8
Alpha Cassiopeiae K0III 150.0 0.00569 27.4
Alpha Persei F5Ib 592 0.00313 59.3
Alpha Leporis F0Ib 1280 0.00177 72.5
Betelgeuse M1Ib 640 0.054 734.4
Antares M1Ib 520 0.041 682.2
Proxima Centauri dM5 4.2 0.007 1.0
Polaris F7 Ib 430 0.00328 45.1