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K2-239 is a small red dwarf star of spectral class M3V. It is 40% the mass and 36% the radius of the Sun with just 0.016 times the luminosity. It has a temperature of 3420 K and its age is unknown. [2] For comparison, the Sun has a temperature of 5778 K and is 4.5 billion years old.
Red dwarf: This was once the smallest known actively fusing star, when found in 2005, through 2013. It is the smallest eclipsing red dwarf, and smallest observationally measured diameter. [101] [102] [103] CoRoT-15b: 82,200 Brown dwarf [104] VB 10: 82,300 Red dwarf: It was the smallest known star from 1948 to 1981. [105] TRAPPIST-1: 82,925
List of smallest red dwarf titleholders; Star Date Radius Solar radii (Sun = 1) Radius Jupiter radii (Jupiter = 1) Radius km (mi) Notes EBLM J0555-57Ab:
SPECULOOS-3, also known as LSPM J2049+3336, is a red dwarf star (spectral type M6.5) located 54.6 light-years from Earth [4] in the constellation Cygnus.It is one of the smallest known stars, and is much cooler, dimmer and smaller than the Sun, having 0.1 times the mass, 0.08% the Sun's luminosity, and an effective temperature of 2,800 K (2,530 °C), which is less than half of the Sun's ...
Its small radius is at the local minimums of the radius–luminosity and radius–temperature trends. [2] This local minimum is predicted to occur at the hydrogen burning limit due to differences in the radius-mass relationships of stars and brown dwarfs. Unlike hydrogen-burning stars, brown dwarfs decrease in radius as mass increases due to ...
Barnard's Star is a small red dwarf star in the constellation of Ophiuchus.At a distance of 5.96 light-years (1.83 pc) from Earth, it is the fourth-nearest-known individual star to the Sun after the three components of the Alpha Centauri system, and is the closest star in the northern celestial hemisphere. [15]
Proxima Centauri is a red dwarf, because it belongs to the main sequence on the Hertzsprung–Russell diagram and is of spectral class M5.5. The M5.5 class means that it falls in the low-mass end of M-type dwarf stars, [14] with its hue shifted toward red-yellow [21] by an effective temperature of ~3,000 K. [8]
VB 10 or Van Biesbroeck's star / v æ n ˈ b iː z b r ʊ k / [7] is a small and dim red dwarf [2] located in the constellation Aquila. It is part of a binary star system. VB 10 is historically notable as it was the least luminous and least massive known star from its discovery in 1944, until 1982 when LHS 2924 was shown to be less luminous. [ 8 ]