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LHS 1140
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Star LHS 1140

Red dwarf LHS 1140 is located 49 light years away from the Sun. It is a single star of spectral class M4.5V, that has 18 % of solar mass. There are multiple known exoplanets in this system.
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Sun distance
49 light years
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LHS 1140

Red dwarf, High proper motion star
Spectral class: M4.5V

Location +

Ascension iconRight ascension: 0h 44m 59.692s
Declination iconDeclination: -15° 16' 27.089'' (equatorial region)
Parallax iconParallax: 66.829
Distance iconSun distance: 48.805 ly | 15.0 pc
Star position
The position of a star tells us where it appears in the sky, similar to how we use coordinates like latitude and longitude on Earth. In astronomy, the three main coordinates are right ascension, declination and distance. .. icon More about Star position in StellarGuide

Basic characteristic

icon weight
Mass: 18.4 % M Sun
| 193 M Jupiter
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Star mass
Mass of the star LHS 1140 is 0.1844 solar masses.

The mass of a star is the total amount of matter it contains. It is one of the most important properties of a star, as it determines almost everything about how the star lives, changes, and dies. In astronomy, star mass is usually measured in solar masses (M☉) — where 1 solar mass is equal to the mass of our Sun... icon More about Star mass in StellarGuide
radius icon
Size: 22 % R Sun
| 2.1 R Jupiter
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Star size
Radius of the star LHS 1140 is 0.2159 solar radii.

The size of a star refers to its radius — the distance from its center to its surface. Star size is usually measured in solar radii (R☉), where 1 solar radius equals approximately 696,000 kilometers. Depending on their type and life stage, stars can be much smaller or larger than the Sun... icon More about Star size in StellarGuide
temperature icon
Temperature: 3096 K | 0.54 T Sun
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Star temperature
Surface temperature of LHS 1140 is 3096 K, which is 54 % of the temperature on the surface of the Sun.

The temperature of a star refers to the temperature at its surface, also called the photosphere. It is measured in kelvins (K), the standard unit for temperature in astronomy. A star’s temperature tells us a lot about its physical properties and where it stands in its evolutionary stage... icon More about Star temperature in StellarGuide
time icon
Age: 4 billions years | 0.87 Sun
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Star age
Star LHS 1140 is 4 billion years old, which is about 0.87 of the Sun's age.

The age of a star tells us how long it has been shining since it formed. Knowing a star’s age helps astronomers understand its life stage, how it has changed over time, and what will happen to it in the future... icon More about Star age in StellarGuide
luminosity icon
Luminosity: 0.0038 L Sun
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Star luminosity
Luminosity is the total amount of energy a star gives off every second. Think of it as the star’s true brightness — not just how bright it looks from Earth. This is important because some stars may appear dim simply because they are far away, not because they’re actually faint... icon More about Star luminosity in StellarGuide

Photometry

Magnitude iconApparent magnitude (V): 14.2
Magnitude iconAbsolute magnitude (V): 13.3
Absolute stellar magnitude in different parts of the electromagnetic spectrum from infrared (K band) to ultraviolet (U band).
5
10
15
20
25
30
35
K
2.1
H
1.6
J
1.2
Grp
0.8
I
0.8
G
0.6
V
0.5
Gbp
0.5
B
0.4
U
0.3
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LHS 1140 system structure

 LHS 1140
LHS 1140 c 0.03 AU 1.9 M⊕ 1.3 R⊕ 3.8 days
LHS 1140 b 0.09 AU 5.6 M⊕ 1.7 R⊕ 24.7 days
LHS 1140 d
unconfirmed
 0.21 AU 3.9 M⊕ 2 R⊕ -

More about LHS 1140

Nearby star LHS 1140 is a main sequence star that fuses hydrogen atoms into helium. It is approximately 20 % of the size of Sun and temperature on its surface is around 3096 K (2823 °C), which is about 54 % of Sun's temperature.
       LHS 1140 can be found in southern celestial hemisphere, however it is too dim to be seen with the naked eye or even a small telescope.
Other designations of this star
G 268-38, G 270-58, GJ 3053, Gliese 3053, 2MASS J00445930-1516166, NLTT 2465, TIC 92226327, TOI-256, WISEA J004459.56-151623.9, WT 1138, Gaia EDR3 2371032916186181760
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External sources
icon study
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Modeling the astrosphere of LHS~1140
Scientific study, Accepted: 05. 12. 2024
icon study
simbad icon
Simbad database (G 268-38)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 2371032916186181760)
Archive from the Gaia mission
tess icon
TESS database (TOI 256.01)
Archive from the TESS mission

News from this star system

Observations of planet LHS 1140 b show no persistent signs of helium escape
Image: Observations of planet LHS 1140 b show no persistent signs of helium escape
New JWST data on LHS 1140 b shows no persistent signs of helium atmospheric escape. Variations in the host Red dwarf star likely explain previous signals, highlighting the complexity of studying distant planetary atmospheres....
23.8.2026
Read article >
Helium-dominated atmospheres on rocky planets provide unique climate conditions for potential life
Image: Helium-dominated atmospheres on rocky planets provide unique climate conditions for potential life
Climate models reveal that rocky planets with helium-dominated atmospheres offer unique temperature profiles. While their habitable zones are narrower than those with hydrogen, their extended atmospheres make them prime targets for transit spectroscopy with the JWST....
1.8.2026
Read article >
Escaping helium atmosphere identified on the rocky exoplanet LHS 1140b
Image: Escaping helium atmosphere identified on the rocky exoplanet LHS 1140b
Spectroscopic observations reveal helium escaping from the atmosphere of rocky exoplanet LHS 1140b. Data from 2024 and 2025 show this process is time-variable, suggesting an atmosphere depleted of hydrogen. No such escape was detected on the companion planet LHS 1140c....
1.8.2026
Read article >

Frequently Asked Questions

How far is the LHS 1140 system from the Sun?

The LHS 1140 system is 49 light years or 15.0 parsecs from the Sun.

What galaxy is the LHS 1140 star in?

The LHS 1140 is in the Milky Way galaxy just like the Sun.

How many stars are in the LHS 1140 system?

The LHS 1140 is a single star, there are no other known stars in the system.

What type of star is the LHS 1140?

The star LHS 1140 is a Red dwarf star.

What temperature is star LHS 1140?

The star LHS 1140 has an effective temperature of 3096 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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