do not follow here
Stellar Catalog more icon Nearby stars catalogue more icon
HD 129209
more icon

Star HD 129209

Yellow-White star HD 129209 is located 179 light years away from the Sun. It is a single star, that has 109 % of solar mass. For now, there are no known exoplanets in this star system.
Loading 3D model
Nearby stars catalogue
Sun distance
179 light years
galaxy map

HD 129209

Yellow-White star

Basic characteristic

icon weight
Mass: 109 % M Sun
| 1142 M Jupiter
+
Star mass
Mass of the star HD 129209 is 1.09 solar 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: 130 % R Sun
| 12.9 R Jupiter
(estimate)
+
Star size
Radius of the star HD 129209 is not known. Its estimated value based on other similar stars is about 130 % 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: 5940 K | 1.03 T Sun
+
Star temperature
Surface temperature of HD 129209 is 5940 K, which is 103 % 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: 5.1 billions years | 1.11 Sun
+
Star age
Star HD 129209 is 5.1 billion years old, which is about 1.11 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

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
Advertisement

HD 129209 system structure

 HD 129171
HD 129209

More about HD 129209

HD 129209 is is approximately 30 % bigger than the Sun and temperature on its surface is around 5940 K (5667 °C), which is about 103 % of Sun's temperature.
       HD 129209 can be found in northern celestial hemisphere, you cannot see it with naked eye, but you can observe this star with basic telescope. The star is easily observable from Northern America, Europe and Asia.
Other designations of this star
HD 129209, Gaia DR3 1282817022334383232
Advertisement
External sources
icon study
_empty
Scientific study, Accepted: 29. 12. 2026
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
icon study
icon study
icon study
gaia icon
Gaia database (Gaia DR3 1282817022334383232)
Archive from the Gaia mission

News from this star system

Narrow ring of gas found near the young star HD 152384
iconToday
Image: Narrow ring of gas found near the young star HD 152384
A narrow ring of gas has been characterized around the young star HD 152384. Located at the dust sublimation radius, the ring likely formed from the collisions of rocky planetesimals, offering a new look at early planetary system evolution....
Read article tag icon
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....
Read article tag icon
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....
Read article tag icon

Frequently Asked Questions

How far is the HD 129209 system from the Sun?

The HD 129209 system is 179 light years or 55.0 parsecs from the Sun.

What galaxy is the HD 129209 star in?

The HD 129209 is in the Milky Way galaxy just like the Sun.

How many stars are in the HD 129209 system?

The HD 129209 is a single star, there are no other known stars in the system.

What type of star is the HD 129209?

The star HD 129209 is a Yellow-White star star.

What temperature is star HD 129209?

The star HD 129209 has an effective temperature of 5940 K. Find out more about the temperature of stars in Stellar guide
Advertisement

exoplanet iconAbout Stellar Catalog

line
Working with real data
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.
Fresh and validated
icon Stellar Catalog is continuously updated with new information from research papers. Stellar and planetary data are validated by automatic processes as well as humans.
Get your next news from nearby stars
Stellar Catalog brings the stars from our galaxy to you. Discover their position, physical properties and whether there are any exoplanets or disks orbiting them. The data in Stellar Catalog come from respectable sources like Gaia space telescope, or SIMBAD database.
Visit Stellar catalog on Facebook
Visit profile on X

Advertisement