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Theta Indi
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Star Theta Indi

Binary star Theta Indi is located 96 light years away from the Sun. It consists of a subgiant and a yellow star. For now, there are no known exoplanets in this star system.
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Sun distance
96 light years
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Theta Indi A

Subgiant
Spectral class: A5IV-V

Location +

Ascension iconRight ascension: 21h 19m 51.999s
Declination iconDeclination: -53° 26' 57.925'' (southern hemisphere)
Parallax iconParallax: 33.930
Distance iconSun distance: 96.126 ly | 29.5 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: 175 % M Sun
| 1833 M Jupiter
+
Star mass
Mass of the star Theta Indi A is 1.75 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: 161 % R Sun
| 16 R Jupiter
+
Star size
Radius of the star Theta Indi A is 1.61 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: 8332 K | 1.44 T Sun
+
Star temperature
Surface temperature of Theta Indi A is 8332 K, which is 144 % 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
luminosity icon
Luminosity: 12.95 L Sun
+
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): 4.5
Magnitude iconAbsolute magnitude (V): 2.1
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

Theta Indi B

Yellow star, High proper motion star
Spectral class: G0V

Basic characteristic

icon weight
Mass: 110 % M Sun
| 1152.3 M Jupiter
 (estimate)
+
Star mass
The mass of the star Theta Indi B is unknown. Based on its other characteristics, it is estimated to be about 110 % of the Sun's mass.

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: 120 % R Sun
| 12.2 R Jupiter
(estimate)
+
Star size
Radius of the star Theta Indi B is not known. Its estimated value based on other similar stars is about 120 % 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 iconTemperature: 6000 K
 (estimate)
+
Star temperature
Surface temperature of Theta Indi B is estimated to be 5966 K, which is 104 % 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): 6.9
Magnitude iconAbsolute magnitude (V): 4.5
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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Theta Indi system structure

 Theta Indi A
Theta Indi B

More about Theta Indi

       Theta Indi can be found in southern celestial hemisphere, and it is possible to see it with naked eye.
Other designations of this star
GJ 9733 A, Gliese 9733 A, HD 202730, CPD−53°10037, GC 29819, HIP 105319, HR 8140, HD 202730, SAO 246965, WDS J21199-5327AB
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External sources
simbad icon
Simbad database (* tet Ind B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)

Frequently Asked Questions

How far is the Theta Indi system from the Sun?

The Theta Indi system is 96 light years or 29.5 parsecs from the Sun.

What galaxy is the Theta Indi star in?

The Theta Indi is in the Milky Way galaxy just like the Sun.

How many stars are in the Theta Indi system?

The Theta Indi system contains 2 stars.

What type of star is the Theta Indi?

The primary in the Theta Indi system is a Subgiant star.

What temperature is star Theta Indi?

The primary in the Theta Indi system has a temperature of 8332 K. Find out more about the temperature of stars in Stellar guide
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