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Iota Horologii
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Star Iota Horologii

Yellow-White star Iota Horologii is located 57 light years away from the Sun. It is a single star of spectral class F8V C, that has 125 % of solar mass. There is at least one exoplanet in this system.
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Sun distance
57 light years
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Iota Horologii

Yellow-White star, High proper motion star
Spectral class: F8V C

Location +

Ascension iconRight ascension: 2h 42m 34.035s
Declination iconDeclination: -50° 47' 57.544'' (southern hemisphere)
Parallax iconParallax: 57.613
Distance iconSun distance: 56.611 ly | 17.4 pc
Star position
The position of a star tells us where it appears in the sky, similar to how we use coordinates like latitude and longitude on Earth. In astronomy, the three main coordinates are right ascension, declination and distance. .. icon More about Star position in StellarGuide

Basic characteristic

icon weight
Mass: 125 % M Sun
| 1309 M Jupiter
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Star mass
Mass of the star Iota Horologii is 1.25 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: 116 % R Sun
| 11.5 R Jupiter
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Star size
Radius of the star Iota Horologii is 1.16 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: 6239 K | 1.08 T Sun
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Star temperature
Surface temperature of Iota Horologii is 6239 K, which is 108 % 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: 0.625 billions years | 0.14 Sun
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Star age
Star Iota Horologii is 0.625 billion years old, which is about 0.14 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
luminosity icon
Luminosity: 1.64 L Sun
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Star luminosity
Luminosity is the total amount of energy a star gives off every second. Think of it as the star’s true brightness — not just how bright it looks from Earth. This is important because some stars may appear dim simply because they are far away, not because they’re actually faint... icon More about Star luminosity in StellarGuide

Photometry

Magnitude iconApparent magnitude (V): 5.4
Magnitude iconAbsolute magnitude (V): 4.2
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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Iota Horologii system structure

 Iota Horologii
Iota Horologii b 0.96 AU 788.4 M⊕ 307.2 days

More about Iota Horologii

Nearby star Iota Horologii is a main sequence star that fuses hydrogen atoms into helium. It is is approximately 16 % bigger than the Sun and temperature on its surface is around 6239 K (5966 °C), which is about 108 % of Sun's temperature.
       Iota Horologii can be found in southern celestial hemisphere, and it is possible to see it with naked eye.
Other designations of this star
ι Hor, GJ 108, Gliese 108, HD 17051, HIC 12653, HIP 12653, HR 810, 2MASS J02423346-5048008, LTT 1322, NLTT 8800, TIC 166853853, TYC 8056-1164-1, WISEA J024233.84-504758.7, Gaia EDR3 4745373133284418816
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External sources
simbad icon
Simbad database (* iot Hor)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 4745373133284418816)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Iota Horologii system from the Sun?

The Iota Horologii system is 57 light years or 17.4 parsecs from the Sun.

What galaxy is the Iota Horologii star in?

The Iota Horologii is in the Milky Way galaxy just like the Sun.

How many stars are in the Iota Horologii system?

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

What type of star is the Iota Horologii?

The star Iota Horologii is a Yellow-White star star.

What temperature is star Iota Horologii?

The star Iota Horologii has an effective temperature of 6239 K. Find out more about the temperature of stars in Stellar guide
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stellar brief logoStellar Brief

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30. 10. 2026
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The early architecture of planetary systems may be set at birth: a study of Sun-like stars found similar rates of star-planet misalignment across different stages of development. Other findings trace how water and carbon dioxide ice fade around young stars, why white-dwarf debris resists breaking into tiny pieces, and why a reported planet around Gliese 48 remains unconfirmed.
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