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PHL 5038 B
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Star PHL 5038 B

Little is known about object PHL 5038 B. Based on its low brightness and position it seems to be a brown dwarf or a very low-mass star.
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Sun distance
240 light years
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PHL 5038 B

Brown dwarf

Location +

Distance iconDistance from the primary: 66 AU

Basic characteristic

icon weight
Mass: 7 % M Sun
| 73 M Jupiter
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Star mass
Mass of the star PHL 5038 B is 0.07 solar masses (or 73.3 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
temperature icon
Temperature: 1425 K | 0.25 T Sun
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Star temperature
Surface temperature of PHL 5038 B is 1425 K, which is 25 % 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
time icon
Age: 10.26 billions years | 2.23 Sun
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Star age
Star PHL 5038 B is 10.26 billion years old, which is about 2.23 of the Sun's age.

The age of a star tells us how long it has been shining since it formed. Knowing a star’s age helps astronomers understand its life stage, how it has changed over time, and what will happen to it in the future... icon More about Star age in StellarGuide

Photometry

Magnitude iconAbsolute magnitude (V): -4.3
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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PHL 5038 B system structure

 PHL 5038 A
PHL 5038 B 66 AU

More about PHL 5038 B

Temperature on its surface is around 1425 K (1152 °C), which is about 25 % of Sun's temperature.
       PHL 5038 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.
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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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News from this star system

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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Massive brown dwarf HD 203771 b confirmed in eccentric orbit around orange dwarf
iconYesterday
Image: Massive brown dwarf HD 203771 b confirmed in eccentric orbit around orange dwarf
Massive brown dwarf HD 203771 b confirmed in an eccentric orbit around an orange dwarf star. New mass measurements place the companion at approximately 70 times the mass of Jupiter, revealing insights into how brown dwarfs migrate inward over time....
Read article tag icon

Frequently Asked Questions

How far is the PHL 5038 B system from the Sun?

The PHL 5038 B system is 240 light years or 73.4 parsecs from the Sun.

What galaxy is the PHL 5038 B star in?

The PHL 5038 B is in the Milky Way galaxy just like the Sun.

How many stars are in the PHL 5038 B system?

The PHL 5038 B is a single star, there are no other known stars in the system.

What type of star is the PHL 5038 B?

The star PHL 5038 B is a Brown dwarf star.

What temperature is star PHL 5038 B?

The star PHL 5038 B has an effective temperature of 1425 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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