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ULAS J130041.74+122114.7
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Star ULAS J130041.74+122114.7

Brown dwarf ULAS J130041.74+122114.7 is located 38 light years away from the Sun. It is a single flare star of spectral class T8.5p, that has 1 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
38 light years
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ULAS J130041.74+122114.7

Brown dwarf, flare star
Spectral class: T8.5p

Basic characteristic

icon weight
Mass: 1 % M Sun
| 10 M Jupiter
+
Star mass
Mass of the star ULAS J130041.74+122114.7 is 0.01 solar masses (or 10.5 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
| 0.5 R Jupiter
(estimate)
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Star size
Radius of the star ULAS J130041.74+122114.7 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 icon
Temperature: 695 K | 0.12 T Sun
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Star temperature
Surface temperature of ULAS J130041.74+122114.7 is 695 K, which is 12 % 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

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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ULAS J130041.74+122114.7 system structure

 Gliese 494 A
Gliese 494 B
ULAS J130041.74+122114.7

More about ULAS J130041.74+122114.7

ULAS J130041.74+122114.7 is is is much smaller than the Sun and temperature on its surface is around 695 K (422 °C), which is about 12 % of Sun's temperature.
       ULAS J130041.74+122114.7 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
GJ 494 C, SDSS J130041.93+122114.7, Ross 458C, WDS J13008+1223C, WISEP J130041.65+122114.6
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External sources
icon study
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Scientific study, Accepted: 29. 12. 2026
icon study
A Sample of Thick-Disk Stars Hosting Hot Jupiters
Scientific study, Accepted: 16. 10. 2026
icon study
icon study
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
simbad icon
Simbad database (ULAS J130041.74+122114.7)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)

News from this star system

WASP-33 b and other hot Jupiters identified as prime targets for structural studies
iconYesterday
Image: WASP-33 b and other hot Jupiters identified as prime targets for structural studies
WASP-33 b, WASP-76 b, and HAT-P-32 b are identified as the best candidates for studying how stellar gravity shapes exoplanet interiors. Measuring their physical deformation will help reveal their deep, internal density structures using JWST and Ariel data....
Read article tag icon
Atmospheric structure of WASP-94 A b revealed through new limb asymmetry method
iconYesterday
Image: Atmospheric structure of WASP-94 A b revealed through new limb asymmetry method
A new analysis of WASP-94 A b reveals a 415 K temperature difference between its morning and evening sides. The evening atmosphere shows signs of H2O, CO2, CO, and H2S, while the morning side remains obscured by aerosols....
Read article tag icon
Thick-disk stars identified as hosts to ancient hot jupiter planets
iconYesterday
Image: Thick-disk stars identified as hosts to ancient hot jupiter planets
New analysis of 268 stars identifies several hot Jupiters orbiting ancient stars in the Milky Way's thick disk. These systems, over 8 billion years old, show distinct differences in mass and orbital periods compared to younger thin-disk populations....
Read article tag icon

Frequently Asked Questions

How far is the ULAS J130041.74+122114.7 system from the Sun?

The ULAS J130041.74+122114.7 system is 38 light years or 11.7 parsecs from the Sun.

What galaxy is the ULAS J130041.74+122114.7 star in?

The ULAS J130041.74+122114.7 is in the Milky Way galaxy just like the Sun.

How many stars are in the ULAS J130041.74+122114.7 system?

The ULAS J130041.74+122114.7 is a single star, there are no other known stars in the system.

What type of star is the ULAS J130041.74+122114.7?

The star ULAS J130041.74+122114.7 is a Brown dwarf star.

What temperature is star ULAS J130041.74+122114.7?

The star ULAS J130041.74+122114.7 has an effective temperature of 695 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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