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Widely recognised as being among the largest known stars, [19] radius decreased to ~500 R ☉ during the 2020 great dimming event. [71] R Horologii: 635 [56] L/T eff: A red giant star with one of the largest ranges in brightness known of stars in the night sky visible to the unaided eye. Despite its large radius, it is less massive than the Sun.
UY Scuti was analyzed to be the largest and the most luminous of the three stars measured, at 1,708 ± 192 R ☉ (1.188 × 10 9 ± 134,000,000 km; 7.94 ± 0.89 AU) based on an angular diameter of 5.48 ± 0.10 mas and an assumed distance of 2.9 ± 0.317 kiloparsecs (kpc) (about 9,500 ± 1,030 light-years) which was originally derived in 1970 ...
A few notable large stars with masses less than 60 M ☉ are shown in the table below for the purpose of comparison, ending with the Sun, which is very close, but would otherwise be too small to be included in the list. At present, all the listed stars are naked-eye visible and relatively nearby.
Mu Cephei is more than 100,000 times brighter than the Sun, with an absolute visual magnitude of −7.6. It is also one of the largest known stars with a radius around or over 1,000 times that of the sun (R ☉), and were it placed in the Sun's position it would engulf the orbit of Mars and Jupiter.
VY Canis Majoris (abbreviated to VY CMa) is an extreme oxygen-rich red hypergiant or red supergiant (O-rich RHG or RSG) and pulsating variable star 1.2 kiloparsecs (3,900 light-years) from the Solar System in the slightly southern constellation of Canis Major.
Mass loss is largest for high-luminosity stars with low surface gravity and enhanced levels of heavy elements in the photosphere. R136a1 loses 1.6 × 10 −4 M ☉ ( 3.21 × 10 18 kg/s ) per year, over a billion times more than the Sun loses, and is expected to have shed about 35 M ☉ since its formation.
KW Sagittarii is a red supergiant star, located approximately 2,420 parsecs (7,900 light-years) away from the Sun in the direction of the constellation Sagittarius.It is one of the largest known stars, with a diameter about 1,000 times larger than the Sun.
The star owes its name to the shape of the Pistol Nebula, which it illuminates. It is located approximately 25,000 light-years from Earth in the direction of Sagittarius. The star has a large mass comparable to V4998 Sagittarii and a luminosity 3.3 million times that of the Sun (L ☉).