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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.
Sun distance
240 light years
galaxy map

PHL 5038 B

Brown dwarf

Location +

Distance iconDistance from the primary: 66 AU

Basic characteristic

icon weight
Mass: 7 % M Sun
| 5 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
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.
External sources
icon study
JWST/MIRI Imaging of the Warm Dust Component of the Epsilon Eridani Debris Disk
Scientific study, Accepted: 29. 09. 2025
icon study
Detection of OH and Fe in the dayside atmosphere of the hottest ultra-hot Jupiter KELT-9b with SPIRou
Scientific study, Accepted: 28. 09. 2025
icon study
HARPS-N Reveals a Well-aligned Orbit for the Highly Eccentric Warm Jupiter TOI-4127 b
Scientific study, Accepted: 26. 09. 2025
icon study
Testing the Impact of Planet-stirring, Self-stirring, and Mixed-stirring on Debris Disc Architecture: A Case Study of HD 16743
Scientific study, Accepted: 26. 09. 2025
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.
News from this star system
calendar icon20. 03 2023
tag iconStars
Article image:

Astronomers have discovered a brown dwarf orbiting the red giant HD 18438

Astronomers led by Byeong-Cheol Lee have made a groundbreaking discovery, detecting a brown dwarf orbiting the red giant HD 18438. With a radius of 89 times that of the Sun, HD 18438 is now the largest known star to be orbited by an exoplanet or brown dwarf.

Read more
calendar icon09. 03 2023
tag iconExoplanets
Article image:

Newly discovered exoplanet HD 207496 b is too close to its star and is loosing atmosphere

Read more
calendar icon03. 03 2023
tag iconExoplanets
Article image:

Two giant exoplanets discovered orbiting nearby Sun-like star HIP 104045

Astronomers discovered two new exoplanets orbiting a star HIP 104045. The star is 175 light years away and its mass and size are similar to the Sun. Both exoplanets are gas giants, smaller than Jupiter.

Read more
calendar icon08. 02 2023
tag iconBrown dwarfs
Article image:

Astronomers used JWST and TESS telescopes to study nearby brown dwarf HD 19467 B

Brown dwarfs are objects between planets and stars. Astronomers divide them into 3 categories according to their temperature - L, T, Y. Their relatively low temperatures and brightness allow them to stay hidden for most part. Only the most powerful infrared telescopes are able to see them and that is where James Webb Space Telescope comes in.

Read more

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