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The size of UY Scuti compared to Earth's orbit and the Sun (barely visible) UY Scuti is a dust-enshrouded bright red supergiant [ 16 ] and is classified as a semiregular variable with an approximate pulsation period of 740 days.
The Sun, the orbit of Earth, Jupiter, and Neptune, compared to four stars (Pistol Star, Rho Cassiopeiae, Betelgeuse, and VY Canis Majoris) Overview Although red supergiants are often considered the largest stars, some other star types have been found to temporarily increase significantly in radius, such as during LBV eruptions or luminous red ...
UY Scuti is a red supergiant and is also one of the largest stars currently known with a radius over 900 times that of the Sun. [11] RSGC1-F01 is another red supergiant whose radius is over 1,450 times that of the Sun. [12] Scutum contains several clusters of supergiant stars, including RSGC1, [13] Stephenson 2 [14] [15] and RSGC3. [16]
Although red supergiants are much cooler than the Sun, they are so much larger that they are highly luminous, typically tens or hundreds of thousands L ☉. [9] There is a theoretical upper limit to the radius of a red supergiant at around 1,500 R ☉. [9] In the Hayashi limit, stars above this radius would be too unstable and simply do not form.
Stephenson 2 DFK 1, also known as RSGC2-01 [a] or St2-18, is a red supergiant (RSG) or possible extreme red hypergiant [2] (RHG) star in the constellation of Scutum.It lies near the open cluster Stephenson 2, which is located about 5.8 kiloparsecs (19,000 light-years) away from Earth in the Scutum–Centaurus Arm of the Milky Way galaxy, and is assumed to be one of a group of stars at a ...
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.
The Pistol Star is over 25 times more massive than the Sun, and is about 1.7 million times more luminous. Considered a candidate LBV, but variability has not been confirmed. V4029 Sagittarii; V905 Scorpii [20] HD 6884, [21] (R40 in SMC) HD 269700, [7] [22] (R116 in the LMC) LBV 1806-20 in the 1806-20 cluster on the other side of the Milky Way.
Size comparison of the event horizons of the black holes of TON 618 and Phoenix A.The orbit of Neptune (white oval) is included for comparison. As a quasar, TON 618 is believed to be the active galactic nucleus at the center of a galaxy, the engine of which is a supermassive black hole feeding on intensely hot gas and matter in an accretion disc.