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2MASS J0915+0422 B
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Star 2MASS J0915+0422 B

Brown dwarf 2MASS J0915+0422 B is located 58 light years away from the Sun. It is a single star of spectral class L9, 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
58 light years
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2MASS J0915+0422 B

Brown dwarf
Spectral class: L9

Basic characteristic

icon weight
Mass: 2 % M Sun
| 21 M Jupiter
 (estimate)
+
Star mass
The estimated mass of the star 2MASS J0915+0422 B 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
| 1.2 R Jupiter
(estimate)
+
Star size
Radius of the star 2MASS J0915+0422 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: 900 K
 (estimate)
+
Star temperature
Surface temperature of 2MASS J0915+0422 B is estimated to be 903 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): -1.2
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
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2MASS J0915+0422 B system structure

 2MASS J0915+0422 A
2MASS J0915+0422 B

More about 2MASS J0915+0422 B

       2MASS J0915+0422 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.
Other designations of this star
Gaia EDR3 579379032258351488
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External sources
icon study
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Scientific study, Accepted: 29. 12. 2026
icon study
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
Any colour you like: the diverse chromaticities of white dwarfs
Scientific study, Accepted: 15. 10. 2026
simbad icon
Simbad database (2MASS J09153413+0422045)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 579379032258351488)
Archive from the Gaia mission

News from this star system

HD 112485 may rotate at different rates within its interior
iconYesterday
Image: HD 112485 may rotate at different rates within its interior
HD 112485 may rotate at different rates within its interior, according to analysis of pulsations in eclipsing binaries. Across 65 β Cephei stars, pulsation amplitude decreased as frequency increased, with no significant link between pulsation frequency and orbital period....
Read article tag icon
Molecular complexity observed in the HD 100546 and IRS 48 planet-forming disks
iconYesterday
Image: Molecular complexity observed in the HD 100546 and IRS 48 planet-forming disks
ALMA observations of the HD 100546 and IRS 48 disks reveal new details about molecular complexity during planet formation. The data highlight distinct chemical differences in water and methanol ratios, offering a window into the evolution of ice reservoirs....
Read article tag icon
HD 120678 shows evidence of a tilting heartbeat disk
icon18. 10. 2026
Image: HD 120678 shows evidence of a tilting heartbeat disk
The classical Be star HD 120678 features a tilting heartbeat disk. Gravitational influence from a companion star forces the gas disk to tilt, creating significant brightness variations that change how the system appears from Earth....
Read article tag icon

Frequently Asked Questions

How far is the 2MASS J0915+0422 B system from the Sun?

The 2MASS J0915+0422 B system is 58 light years or 17.6 parsecs from the Sun.

What galaxy is the 2MASS J0915+0422 B star in?

The 2MASS J0915+0422 B is in the Milky Way galaxy just like the Sun.

How many stars are in the 2MASS J0915+0422 B system?

The 2MASS J0915+0422 B is a single star, there are no other known stars in the system.

What type of star is the 2MASS J0915+0422 B?

The star 2MASS J0915+0422 B is a Brown dwarf star.

What temperature is the 2MASS J0915+0422 B?

The primary in the 2MASS J0915+0422 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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