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Nearby stars catalogue

HD 18438

Star HD 18438

Red giant HD 18438 is located 768 light years away from the Sun. It is a single star of spectral class M2.5 III , that has 184 % of solar mass. There is at least one exoplanet in this system.

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Nearby stars catalogue

Sun distance
768 light years

HD 18438

Red giant

Spectral class: M2.5 III

Location +

Right ascension: 3h 6m 7.635s

Declination: 79° 25' 6.893'' (northern hemisphere)

Parallax: 4.247

Sun distance: 767.961 ly | 235.5 pc

Basic characteristic

Mass: 184 % M Sun

Size: 8850 % R Sun

Temperature: 3860 K | 0.67 T Sun

Age: 5.5 billions years | 1.2 Sun

Photometry

Apparent magnitude (V): 5.6

Absolute magnitude (V): -1.3

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

HD 18438 system structure


	HD 18438
		HD 18438 b	2.1 AU	6676 M⊕		803 days

More about HD 18438

Star HD 18438 is is much bigger than the Sun and temperature on its surface is around 3860 K (3587 °C), which is about 67 % of Sun's temperature.

       HD 18438 can be found in northern celestial hemisphere, and it is possible to see it with naked eye. The star is easily observable from Northern America, Europe and Asia.

Other designations of this star
TYC 4516-2147-1, USNO-A2 1650-00599936, HR 881, HIP 14417, TIC 297820335, 2MASS J03060788+7925066

External sources

A search for exoplanets around north circumpolar stars. VII. Detection of planetary companion orbiting the largest host star HD 18438

Scientific study, Accepted: 15. 03. 2023

Frequently Asked Questions

How far is the HD 18438 system from the Sun?

The HD 18438 system is 768 light years or 235.5 parsecs from the Sun.

What galaxy is the HD 18438 star in?

The HD 18438 is in the Milky Way galaxy just like the Sun.

How many stars are in the HD 18438 system?

The HD 18438 is a single star, there are no other known stars in the system.

What type of star is the HD 18438?

The star HD 18438 is a Red giant star.

What temperature is star HD 18438?

The star HD 18438 has an effective temperature of 3860 K. Find out more about the temperature of stars in Stellar guide

Class of stars Red giant

White dwarfs are the hot, extremely dense stellar remnants left behind by stars that originally had masses between about 0.5 and 8 times the mass of the Sun during their main sequence lifetimes. After exhausting their nuclear fuel, these stars shed their outer layers and leave behind a compact core. Although white dwarfs contain between roughly 0.2 and 1.44 solar masses, this mass is packed into a volume comparable to that of an Earth-sized planet, making them some of the densest objects in the Universe.

Stellar Brief

24. 10. 2026

A planet’s helium atmosphere streams ahead of its orbit, while infrared observations reveal the hidden rhythms of its star. New work also shows how neutron-star tilt can reshape X-ray light, traces the past of massive blue supergiants, and maps cloudy and clear zones on the hot Jupiter WASP-43 b.

Today's Stellar Brief

About Stellar Catalog

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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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