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BUG 12 B
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Star BUG 12 B

Brown dwarf BUG 12 B is located 60 light years away from the Sun. It is a single star of spectral class L4.5, that has typically about 4 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
60 light years
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BUG 12 B

Brown dwarf
Spectral class: L4.5

Basic characteristic

icon weight
Mass: 4 % M Sun
| 41.9 M Jupiter
 (estimate)
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Star mass
The estimated mass of the star BUG 12 B is about 4 % of the Sun's mass, or approximately 41.9 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
(estimate)
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Star size
Radius of the star BUG 12 B 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: 1600 K
 (estimate)
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Star temperature
Surface temperature of BUG 12 B is estimated to be 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

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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BUG 12 B system structure

 BUG 12 A
BUG 12 B

More about BUG 12 B

       BUG 12 B 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
Gaia DR3 6000386835153463680
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External sources
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Scientific study, Accepted: 29. 12. 2026
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A Spatial Map of the Atmospheric Limb of a Hot Jupiter
Scientific study, Accepted: 14. 10. 2026
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simbad icon
Simbad database (** BUG 12B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia DR3 6000386835153463680)
Archive from the Gaia mission

News from this star system

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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Periodic transit timing variations measured for Neptune-like planet HAT-P-18 b
iconToday
Image: Periodic transit timing variations measured for Neptune-like planet HAT-P-18 b
New observations from the James Webb Space Telescope show periodic transit timing variations in the Neptune-like planet HAT-P-18 b. The data indicates an orbital timing shift of 92.9 seconds, providing fresh insights into the dynamics of this distant system....
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Orbital and atmospheric evolution of the mini-Neptune TOI-2257 b
iconToday
Image: Orbital and atmospheric evolution of the mini-Neptune TOI-2257 b
The exoplanet TOI-2257 b orbits its star once every 35 days with a high eccentricity. New models suggest its atmospheric and orbital fate depends on whether it is a gas-rich mini-Neptune or a rocky super-Earth. Higher eccentricity would confirm a gaseous nature....
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Frequently Asked Questions

How far is the BUG 12 B system from the Sun?

The BUG 12 B system is 60 light years or 18.5 parsecs from the Sun.

What galaxy is the BUG 12 B star in?

The BUG 12 B is in the Milky Way galaxy just like the Sun.

How many stars are in the BUG 12 B system?

The BUG 12 B is a single star, there are no other known stars in the system.

What type of star is the BUG 12 B?

The star BUG 12 B is a Brown dwarf star.

What temperature is the BUG 12 B?

The primary in the BUG 12 B 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 Data in Stellar Catalog come from trusted scientific sources. Primary source is Gaia space telescope mapping the stars in Milky Way. Other sources include research papers, Simbad catalog and Exoplanet.eu database.
Estimated values
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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