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Iota Hydri
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Star Iota Hydri

Subgiant Iota Hydri is located 95 light years away from the Sun. It is a single star of spectral class F5IV-V, that has 138 % of solar mass. There is at least one exoplanet in this system.
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Sun distance
95 light years
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Iota Hydri

Subgiant, High proper motion star
Spectral class: F5IV-V

Location +

Ascension iconRight ascension: 3h 15m 58.230s
Declination iconDeclination: -77° 23' 17.436'' (southern hemisphere)
Parallax iconParallax: 34.264
Distance iconSun distance: 95.190 ly | 29.2 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: 138 % M Sun
| 1446 M Jupiter
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Star mass
Mass of the star Iota Hydri is 1.38 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: 158 % R Sun
| 15.7 R Jupiter
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Star size
Radius of the star Iota Hydri is 1.575 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: 6612 K | 1.14 T Sun
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Star temperature
Surface temperature of Iota Hydri is 6612 K, which is 114 % 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

Photometry

Magnitude iconApparent magnitude (V): 5.5
Magnitude iconAbsolute magnitude (V): 3.2
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 Hydri system structure

 Iota Hydri
Iota Hydri b
unconfirmed
 17.78 AU 4291.7 M⊕ -

More about Iota Hydri

Nearby star Iota Hydri is a main sequence star that fuses hydrogen atoms into helium. It is is approximately 58 % bigger than the Sun and temperature on its surface is around 6612 K (6339 °C), which is about 114 % of Sun's temperature.
       Iota Hydri can be found in southern celestial hemisphere, and it is possible to see it with naked eye.
Other designations of this star
HD 21024, HIP 15201, iot Hyi, TIC 431380163, 2MASS J03155768-7723184, TYC 9366-741-1, HR 1025, Gaia DR3 4626843786944938880
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External sources
simbad icon
Simbad database (* iot Hyi)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia DR3 4626843786944938880)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Iota Hydri system from the Sun?

The Iota Hydri system is 95 light years or 29.2 parsecs from the Sun.

What galaxy is the Iota Hydri star in?

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

How many stars are in the Iota Hydri system?

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

What type of star is the Iota Hydri?

The star Iota Hydri is a Subgiant star.

What temperature is star Iota Hydri?

The star Iota Hydri has an effective temperature of 6612 K. Find out more about the temperature of stars in Stellar guide
Class of stars Subgiant
A subgiant is a term used to describe a luminous star that is typically running out of hydrogen for nuclear fusion and is thus departing from the main sequence. These stars are classified as Yerkes luminosity class IV.
Possible companions

 2MASS J03171968-7722171
 - 0.3 ly
Closest stars

 L 12-6
 - 5.7 ly

2MASS J03242687-7727053
 - 9.4 ly

Gaia DR3 4686584548651046400
 - 12.1 ly

SCR J0100-7904
 - 12.1 ly

SCR J0113-7603
 - 12.6 ly
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stellar brief logoStellar Brief

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23. 10. 2026
stellar brief logo
Today’s astronomy highlights reveal a striking contrast on exoplanet WASP-43 b: models indicate that its nightside is largely cloudy, while its dayside appears clear at the level where light emerges. The findings offer a new way to compare the planet’s extreme weather with telescope observations.
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exoplanet iconAbout Stellar Catalog

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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.
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