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Struve 2398
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Star Struve 2398

Binary star Struve 2398 is located 11 light years away from the Sun. It consists of 2 red dwarf stars. There are multiple known exoplanets in this system.
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Sun distance
11 light years
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Struve 2398 A

Red dwarf, flare star, High proper motion star
Spectral class: M3 V

Location +

Ascension iconRight ascension: 18h 42m 43.944s
Declination iconDeclination: 59° 38' 18.088'' (northern hemisphere)
Parallax iconParallax: 283.840
Distance iconSun distance: 11.491 ly | 3.5 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: 33 % M Sun
| 346 M Jupiter
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Star mass
Mass of the star Struve 2398 A is 0.33 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: 35 % R Sun
| 3.5 R Jupiter
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Star size
Radius of the star Struve 2398 A is 0.351 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: 3370 K | 0.58 T Sun
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Star temperature
Surface temperature of Struve 2398 A is 3370 K, which is 58 % 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: 6.2 billions years | 1.35 Sun
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Star age
Star Struve 2398 A is 6.2 billion years old, which is about 1.35 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: 0.039 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): 8.9
Magnitude iconAbsolute magnitude (V): 11.2
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

Struve 2398 B

Red dwarf, flare star, High proper motion star
Spectral class: M3.5 V

Location +

Distance iconDistance from the primary: 63 AU

Basic characteristic

icon weight
Mass: 25 % M Sun
| 262 M Jupiter
+
Star mass
Mass of the star Struve 2398 B is 0.33 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: 28 % R Sun
| 2.8 R Jupiter
+
Star size
Radius of the star Struve 2398 B is 0.28 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: 3379 K | 0.58 T Sun
+
Star temperature
Surface temperature of Struve 2398 B is 3379 K, which is 58 % 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: 8.7 billions years | 1.89 Sun
+
Star age
Star Struve 2398 B is 8.7 billion years old, which is about 1.89 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: 0.021 L Sun
+
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): 9.7
Magnitude iconAbsolute magnitude (V): 12
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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Struve 2398 system structure

 Struve 2398 A
Struve 2398 A b
unconfirmed
 0.07 AU 2.8 M⊕ 11.2 days
Struve 2398 B 63 AU
Struve 2398 B b
unconfirmed
 0.04 AU 1.5 M⊕ 4.8 days
Struve 2398 B c 0.14 AU 3.5 M⊕ 37.9 days

More about Struve 2398

       Struve 2398 can be found in northern celestial hemisphere, you cannot see it with naked eye, but you can observe this star with basic telescope. The star is easily observable from Northern America, Europe and Asia.
Other designations of this star
G 227-047, HD 173740, HIP 91772, LHS 91772., Gliese 725, G 227-046, HD 173739, HIP 91768, LHS 58, Vyssotsky 184, ADS 11632, BD +59°1915, GCTP 4330.00 A/B, Gaia EDR3 2154880616774131840
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External sources
icon study
icon study
simbad icon
Simbad database (HD 173740)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 2154880616774131712)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Struve 2398 system from the Sun?

The Struve 2398 system is 11 light years or 3.5 parsecs from the Sun.

What galaxy is the Struve 2398 star in?

The Struve 2398 is in the Milky Way galaxy just like the Sun.

How many stars are in the Struve 2398 system?

The Struve 2398 system contains 2 stars.

What type of star is the Struve 2398?

The primary in the Struve 2398 system is a Red dwarf star.

What temperature is star Struve 2398?

The primary in the Struve 2398 system has a temperature of 3370 K. Find out more about the temperature of stars in Stellar guide
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