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Nearby stars catalogue

TOI 4129

Star TOI 4129

TOI-4129, also catalogued as TIC 123357034, 2MASS J18460652+4614546, Gaia DR3 2119155349385688576 and KIC 9568859, is an orange dwarf about 426.775 light-years from the Sun. It has 0.698 times the Sun’s mass, 0.671 times the Sun’s radius and a surface temperature of 4,564 kelvins. Its measured 12.7-day rotation period indicates an estimated system age of about 1.2 billion years.

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Nearby stars catalogue

Sun distance
427 light years

TOI 4129

Orange star

Location +

Right ascension: 18h 46m 6.548s

Declination: 46° 14' 54.844'' (northern hemisphere)

Parallax: 7.640

Sun distance: 426.775 ly | 130.8 pc

Basic characteristic

Mass: 69.8 % M Sun

Size: 67 % R Sun

Temperature: 4564 K | 0.79 T Sun

Age: 6.5 billions years | 1.41 Sun

Luminosity: 0.176 L Sun

Photometry

Apparent magnitude (V): 12.9

Absolute magnitude (V): 7.3

Absolute stellar magnitude in different parts of the electromagnetic spectrum from infrared (K band) to ultraviolet (U band).

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

TOI 4129 system structure


	TOI 4129
		TOI 4129 b	0.04 AU	25.5 M⊕	5.7 R⊕	3.3 days

More about TOI 4129

Star TOI 4129 is approximately 70 % of the size of Sun and temperature on its surface is around 4564 K (4291 °C), which is about 79 % of Sun's temperature.

       TOI 4129 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
TIC 123357034, 2MASS J18460652+4614546, Gaia DR3 2119155349385688576, KIC 9568859

External sources

The Hot Neptune Initiative (HONEI): IV. TOI-4129 b, an Adolescent Neptune in the Ridge

Scientific study, Accepted: 02. 11. 2026

News from this star system

TOI-4129 b sits at the inner edge of the Neptune ridge

Yesterday

Image: TOI-4129 b sits at the inner edge of the Neptune ridge

TOI-4129 b has about 5.7 Earth radii, 26 Earth masses and a 3.27-day orbit. Its low density and position at the inner edge of the Neptune ridge make it a candidate for atmospheric observations with JWST and Ariel....

Read article

Frequently Asked Questions

How far is the TOI 4129 system from the Sun?

The TOI 4129 system is 427 light years or 130.8 parsecs from the Sun.

What galaxy is the TOI 4129 star in?

The TOI 4129 is in the Milky Way galaxy just like the Sun.

How many stars are in the TOI 4129 system?

The TOI 4129 is a single star, there are no other known stars in the system.

What type of star is the TOI 4129?

The star TOI 4129 is a Orange star star.

What temperature is star TOI 4129?

The star TOI 4129 has an effective temperature of 4564 K. Find out more about the temperature of stars in Stellar guide

Stellar Brief

12. 11. 2026

TOI-4129 b is a low-density world at the inner edge of the Neptune ridge, with an atmosphere that could be studied by future space telescopes. Elsewhere, Epsilon Indi Ab’s chemistry points to ingredients formed in extreme cold, Barnard’s Star may preserve clues to a lost planet, and JWST observations refine views of HIP 65426 b and the planet search around Altair. Google Search Console impression data was unavailable today.

Today's Stellar Brief

About Stellar Catalog

Working with real data

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

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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Stellar Catalog is continuously updated with new information from research papers. Stellar and planetary data are validated by automatic processes as well as humans.