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Xi Ursae Majoris C
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Star Xi Ursae Majoris C

Brown dwarf Xi Ursae Majoris C is located 29 light years away from the Sun. It is a single star of spectral class T8.5, that has typically about 3 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
29 light years
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Xi Ursae Majoris C

Brown dwarf
Spectral class: T8.5

Basic characteristic

icon weight
Mass: 2 % M Sun
| 21 M Jupiter
 (estimate)
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Star mass
The estimated mass of the star Xi Ursae Majoris C is about 2 % of the Sun's mass, or approximately 21 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
| 0.9 R Jupiter
(estimate)
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Star size
Radius of the star Xi Ursae Majoris C is not known. Its estimated value based on other similar stars is about 10 % 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 iconTemperature: 900 K
 (estimate)
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Star temperature
Surface temperature of Xi Ursae Majoris C is estimated to be 920 K, which is 16 % 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

Photometry

Magnitude iconAbsolute magnitude (V): 0.3
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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Xi Ursae Majoris C system structure

 Xi Ursae Majoris Aa
Xi Ursae Majoris Ab
Xi Ursae Majoris Ba
Xi Ursae Majoris Bb
Xi Ursae Majoris C

More about Xi Ursae Majoris C

       Xi Ursae Majoris C can be found in northern celestial hemisphere, however it is too dim to be seen with the naked eye or even a small telescope.
Other designations of this star
WISE J111838.70+312537.9, WISE J1118+3125
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External sources
icon study
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Scientific study, Accepted: 29. 12. 2026
icon study
icon study
icon study
icon study
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
simbad icon
Simbad database (WISE J111838.70+312537.9)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)

News from this star system

Molecular emission in the disk around DM Tauri reveals complex chemical processes
iconYesterday
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....
Read article tag icon
Narrow ring of gas found near the young star HD 152384
iconYesterday
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....
Read article tag icon
Atmospheric composition of hot Jupiter KELT-2A b reveals chemical history
iconYesterday
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....
Read article tag icon

Frequently Asked Questions

How far is the Xi Ursae Majoris C system from the Sun?

The Xi Ursae Majoris C system is 29 light years or 8.8 parsecs from the Sun.

What galaxy is the Xi Ursae Majoris C star in?

The Xi Ursae Majoris C is in the Milky Way galaxy just like the Sun.

How many stars are in the Xi Ursae Majoris C system?

The Xi Ursae Majoris C is a single star, there are no other known stars in the system.

What type of star is the Xi Ursae Majoris C?

The star Xi Ursae Majoris C is a Brown dwarf star.

What temperature is the Xi Ursae Majoris C?

The primary in the Xi Ursae Majoris C system has an effective temperature of K ( °C). 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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icon Objects listed in the Stellar Catalog often have values that are estimates. These estimates are determined using their known characteristics, such as spectral type, brightness across different wavelengths, distance from a star, and other factors.
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