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15 Sagittae B
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Star 15 Sagittae B

Brown dwarf 15 Sagittae B is located 58 light years away from the Sun. It is a single star of spectral class L4, that has 7 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
58 light years
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15 Sagittae B

Brown dwarf
Spectral class: L4

Basic characteristic

icon weight
Mass: 6.6 % M Sun
| 69 M Jupiter
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Star mass
Mass of the star 15 Sagittae B is 0.066 solar masses (or 69.1 Jupiter 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: 10 % R Sun
| 1 R Jupiter
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Star size
Radius of the star 15 Sagittae B is 0.1 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: 1600 K | 0.28 T Sun
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Star temperature
Surface temperature of 15 Sagittae B is 1600 K, which is 28 % 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: 0.000075 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 iconAbsolute magnitude (V): -1.3
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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15 Sagittae B system structure

 15 Sagittae A
15 Sagittae B

More about 15 Sagittae B

and temperature on its surface is around 1600 K (1327 °C), which is about 28 % of Sun's temperature.
       15 Sagittae B can be found in northern celestial hemisphere, however it is too dim to be seen with the naked eye or even a small telescope.
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External sources
icon study
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Scientific study, Accepted: 29. 12. 2026
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icon study
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icon study
A Spatial Map of the Atmospheric Limb of a Hot Jupiter
Scientific study, Accepted: 14. 10. 2026
icon study
icon study
icon study
icon study
Peering into the Midplane of the DM Tau Disk using N2H+ and DCO+
Scientific study, Accepted: 13. 10. 2026

News from this star system

Molecular emission in the disk around DM Tauri reveals complex chemical processes
iconToday
Image: Molecular emission in the disk around DM Tauri reveals complex chemical processes
Observations of the disk around DM Tauri reveal how N2H+ and DCO+ molecules are distributed. The data show that external UV radiation and cosmic rays influence the chemical makeup of the disk out to 400 astronomical units, impacting how planets may form....
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Narrow ring of gas found near the young star HD 152384
iconToday
Image: Narrow ring of gas found near the young star HD 152384
A narrow ring of gas has been characterized around the young star HD 152384. Located at the dust sublimation radius, the ring likely formed from the collisions of rocky planetesimals, offering a new look at early planetary system evolution....
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Atmospheric composition of hot Jupiter KELT-2A b reveals chemical history
iconToday
Image: Atmospheric composition of hot Jupiter KELT-2A b reveals chemical history
New observations of hot Jupiter KELT-2A b confirm water vapor in its atmosphere. The planet shows a carbon-to-oxygen ratio similar to its host star but with overall lower metallicity, suggesting a complex migration history from far out in its star system....
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Frequently Asked Questions

How far is the 15 Sagittae B system from the Sun?

The 15 Sagittae B system is 58 light years or 17.8 parsecs from the Sun.

What galaxy is the 15 Sagittae B star in?

The 15 Sagittae B is in the Milky Way galaxy just like the Sun.

How many stars are in the 15 Sagittae B system?

The 15 Sagittae B is a single star, there are no other known stars in the system.

What type of star is the 15 Sagittae B?

The star 15 Sagittae B is a Brown dwarf star.

What temperature is star 15 Sagittae B?

The star 15 Sagittae B has an effective temperature of 1600 K. Find out more about the temperature of stars in Stellar guide
Class of stars Brown dwarf
Brown dwarfs are not really stars, because there is no thermonuclear fusion in their core. These objects are smaller and cooler than stars, but too massive to be considered planets.
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