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Eta Scorpii
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Star Eta Scorpii

Subgiant Eta Scorpii is located 73 light years away from the Sun. It is a single star of spectral class F5IV, that has 175 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
73 light years
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Eta Scorpii

Subgiant, High proper motion star
Spectral class: F5IV

Location +

Ascension iconRight ascension: 17h 12m 9.227s
Declination iconDeclination: -43° 14' 25.690'' (southern hemisphere)
Parallax iconParallax: 44.571
Distance iconSun distance: 73.176 ly | 22.4 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: 175 % M Sun
| 1833 M Jupiter
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Star mass
Mass of the star Eta Scorpii 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: 331 % R Sun
| 32.9 R Jupiter
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Star size
Radius of the star Eta Scorpii is 3.307 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: 6533 K | 1.13 T Sun
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Star temperature
Surface temperature of Eta Scorpii is 6533 K, which is 113 % 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: 1.1 billions years | 0.24 Sun
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Star age
Star Eta Scorpii is 1.1 billion years old, which is about 0.24 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: 17.94 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): 3.3
Magnitude iconAbsolute magnitude (V): 1.6
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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Eta Scorpii system structure

 Eta Scorpii

More about Eta Scorpii

Nearby star Eta Scorpii is a main sequence star that fuses hydrogen atoms into helium. It is is approximately 3 times bigger than the Sun and temperature on its surface is around 6533 K (6260 °C), which is about 113 % of Sun's temperature.
       Eta Scorpii can be found in southern celestial hemisphere, and it is possible to see it with naked eye. The star is also observable from Northern America, Europe and Asia.
Other designations of this star
η Sco, eta Sco, CD−43 11485, FK5 638, GJ 657, Gliese 657, HD 155203, HIP 84143, HR 6380, SAO 227707, Gaia EDR3 5965222838410499328
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External sources
simbad icon
Simbad database (* eta Sco)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 5965222838410499328)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Eta Scorpii system from the Sun?

The Eta Scorpii system is 73 light years or 22.4 parsecs from the Sun.

What galaxy is the Eta Scorpii star in?

The Eta Scorpii is in the Milky Way galaxy just like the Sun.

How many stars are in the Eta Scorpii system?

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

What type of star is the Eta Scorpii?

The star Eta Scorpii is a Subgiant star.

What temperature is star Eta Scorpii?

The star Eta Scorpii has an effective temperature of 6533 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

 L 413-148
 - 0.4 ly
Closest stars

 RX J1733.6-4255
 - 5 ly

HD 154590
 - 6 ly

2MASS J17191934-4736182
 - 6.1 ly

Gaia EDR3 5963919642242901760
 - 7.1 ly

L 411-5
 - 8.9 ly
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Estimated values
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