Search results
Results from the WOW.Com Content Network
An ultra-cool dwarf is a stellar or sub-stellar object that has an effective temperature lower than 2,700 K (2,430 °C; 4,400 °F). [1] This category of dwarf stars was introduced in 1997 by J. Davy Kirkpatrick , Todd J. Henry, and Michael J. Irwin .
TRAPPIST-1h, also designated as 2MASS J23062928-0502285 h, is an exoplanet orbiting around the ultra-cool dwarf star TRAPPIST-1, located 40.7 light-years (12.5 parsecs) away from Earth in the constellation Aquarius. It was one of four new exoplanets to be discovered orbiting the star in 2017 using observations from the Spitzer Space Telescope.
TRAPPIST-1 is a cool red dwarf star [c] with seven known exoplanets. It lies in the constellation Aquarius about 40.66 light-years away from Earth, and has a surface temperature of about 2,566 K (2,290 °C; 4,160 °F). Its radius is slightly larger than Jupiter and it has a mass of about 9% of the Sun.
TRAPPIST-1f, also designated as 2MASS J23062928-0502285 f, is an exoplanet, likely rocky, [2] orbiting within the habitable zone [5] around the ultracool dwarf star TRAPPIST-1, located 40.7 light-years (12.5 parsecs) away from Earth in the constellation of Aquarius.
SPECULOOS-3 b is an Earth-sized exoplanet, orbiting the ultracool red dwarf star SPECULOOS-3.It is relatively close to Earth, at a distance of 55 light-years. [4] SPECULOOS-3 b takes only about 17 hours to complete an orbit around SPECULOOS-3, and, because of that proximity, it receives very high levels of radiation and is tidally locked, meaning that one side of the planet always faces its ...
LP 791-18 (TOI-736) is a cool M dwarf star in the constellation Crater, located 26.65 parsecs (86.9 light-years) away from Earth. [3] The star is one of the smallest known to host exoplanets. [5] In 2019 two exoplanets in transit around it were announced by TESS, [3] and a third planet was discovered in Spitzer Space Telescope data in 2023. [5]
The planet orbits its host star every 3.34 days at a distance of 0.0558 AU (8,350,000 km), a mere one-seventh the radius of Mercury's orbit. This proximity to its host star, 20 times more luminous than the Sun, heats its atmosphere up to a white-hot equilibrium temperature of 2,470 K (2,200 °C; 3,990 °F), comparable to the boiling point of silver (2,162 °C [7]).
K2-33's spectrum is best modelled with a spectral type of M3.3 and a visual extinction of 0.75 magnitudes, [2] so the star can be considered to be a red dwarf. Its effective temperature has been measured at 3,540 K , which together with the apparent brightness of the star indicates a luminosity of 0.15 times the solar luminosity and a radius of ...