Star NLTT 24399
TOI-1231 is an orange dwarf star located approximately 89.6 light-years from the Sun. It is a main-sequence star with a mass of 0.485 solar masses and a radius of 0.476 solar radii. With a surface temperature of 3553 Kelvin, this star serves as the host for the temperate exo-Neptune TOI-1231 b, providing a stable environment for studying the atmospheric properties of sub-Neptune planets.
Frequently Asked Questions
How far is the NLTT 24399 system from the Sun?
The NLTT 24399 system is 90 light years or 27.5 parsecs from the Sun.
What galaxy is the NLTT 24399 star in?
The NLTT 24399 is in the Milky Way galaxy just like the Sun.
How many stars are in the NLTT 24399 system?
The NLTT 24399 is a single star, there are no other known stars in the system.
What type of star is the NLTT 24399?
The star NLTT 24399 is a Red dwarf star.
What temperature is star NLTT 24399?
The star NLTT 24399 has an effective temperature of 3553 K. Find out more about the temperature of stars in
Stellar guide
Class of stars Red dwarf
Red dwarfs are small, cool stars with surface temperatures of about 2,000–3,800 K, much cooler than the Sun. They usually have 8–50% of the Sun’s mass and shine very faintly, sometimes at just a tiny fraction of the Sun’s brightness. Classified mainly as spectral type M, they are the most common stars in the Milky Way, making up roughly 70–75% of its stellar population.
They fuse hydrogen slowly through the proton–proton chain and are fully convective, which allows them to use their fuel very efficiently. As a result, red dwarfs can live for tens of billions to trillions of years—far longer than the Sun. Many exoplanets orbit red dwarfs, including some in close habitable zones, though strong stellar activity can affect planetary environments.
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2. 7. 2026
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