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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. [73] R Horologii: 630 [58] 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.
It was only discovered to be (at least) two stars in the past few decades. Both the obscuring clouds and the great distances also make it difficult to judge whether the star is just a single supermassive object or, instead, a multiple star system .
The primary star is among the largest stars discovered to date, with an estimated radius of 1,157 R ☉ [9] (5.38 AU). If it replaced the Sun , its surface would reach past Jupiter 's orbit (5.20 AU [ 11 ] ).
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 ...
[3] [62] [65] The star is very unstable, having a prodigious mass loss such as in ejections. VY Canis Majoris is a candidate for a star in a second red supergiant phase, but this is mostly speculative and unconfirmed. [66] From this star CO emission is coincident with the bright KI shell in its asymmetric nebula. The star will produce either:
WOH G64 (IRAS 04553-6825) is a symbiotic binary in the Large Magellanic Cloud (LMC), roughly 160,000 light-years from Earth. The main component of this system was once recognized as the best candidate for the largest known star when it was a red supergiant, [7] until it gradually became a yellow hypergiant with half of its original size and 34% of its luminosity.
The following are lists of stars. ... List of most massive stars; List of largest known stars; ... EBLM J0555-57Ab — is one of the smallest stars ever discovered.
RSGC1-F01 is a red supergiant located in RSGC1. The radius was calculated to be around 1,450 [7]-1,530 [6] times that of the Sun (the radius is calculated by applying the Stefan-Boltzmann law), making it one of the largest stars discovered so far.