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LHS 1678
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Star LHS 1678

Binary star LHS 1678 is located 65 light years away from the Sun. It consists of a red dwarf and a brown dwarf. There are multiple known exoplanets in this system.
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Sun distance
65 light years
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LHS 1678 A

Red dwarf, High proper motion star
Spectral class: M2.0 D

Location +

Ascension iconRight ascension: 4h 32m 42.974s
Declination iconDeclination: -39° 47' 27.632'' (southern hemisphere)
Parallax iconParallax: 50.340
Distance iconSun distance: 64.791 ly | 19.9 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: 34.5 % M Sun
| 361 M Jupiter
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Star mass
Mass of the star LHS 1678 A is 0.345 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: 33 % R Sun
| 3.3 R Jupiter
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Star size
Radius of the star LHS 1678 A is 0.329 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: 3490 K | 0.6 T Sun
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Star temperature
Surface temperature of LHS 1678 A is 3490 K, which is 60 % 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
luminosity icon
Luminosity: 0.0145 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): 12.5
Magnitude iconAbsolute magnitude (V): 11
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

LHS 1678 B

Brown dwarf, , High proper motion star

Photometry

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 1678 system structure

 LHS 1678 A
LHS 1678 A b 0.01 AU 0.4 M⊕ 0.7 R⊕ 0.9 days
LHS 1678 A c 0.03 AU 1.4 M⊕ 1 R⊕ 3.7 days
LHS 1678 A d 0.04 AU 1 R⊕ 5 days
LHS 1678 B

More about LHS 1678

       LHS 1678 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
L 375-2, LFT 360, LTT 2022, 2MASS J04324261-3947112, NLTT 13515, TIC 77156829, TOI-696, WISEA J043242.84-394722.1, Gaia DR3 4864160624337973248
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External sources
icon study
icon study
Validation of a Third Planet in the LHS 1678 System
Scientific study, Accepted: 29. 02. 2024

Frequently Asked Questions

How far is the LHS 1678 system from the Sun?

The LHS 1678 system is 65 light years or 19.9 parsecs from the Sun.

What galaxy is the LHS 1678 star in?

The LHS 1678 is in the Milky Way galaxy just like the Sun.

How many stars are in the LHS 1678 system?

The LHS 1678 system contains 2 stars.

What type of star is the LHS 1678?

The primary in the LHS 1678 system is a Red dwarf star.

What temperature is star LHS 1678?

The primary in the LHS 1678 system has a temperature of 3490 K. Find out more about the temperature of stars in Stellar guide
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stellar brief logoStellar Brief

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5. 11. 2026
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K2-18 b and TOI-270 d may have far more varied interiors than simple models suggest, with much less certainty about what lies beneath their atmospheres. Other studies show how tides reshape atmospheric signals on WASP-12 b and WASP-121 b, while Gliese 3470’s changing surface can mimic the signal of its Neptune-size planet.
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