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Epsilon Lupi Aa
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Star Epsilon Lupi Aa

Triple star system Epsilon Lupi Aa is located 512 light years away from the Sun. It is a system with 3 stars. For now, there are no known exoplanets in this star system.
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Sun distance
512 light years
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Epsilon Lupi Aa

Subgiant
Spectral class: B3IV

Location +

Ascension iconRight ascension: 15h 22m 40.848s
Declination iconDeclination: -44° 41' 23.004'' (southern hemisphere)
Parallax iconParallax: 6.370
Distance iconSun distance: 512.019 ly | 157.0 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: 1324 % M Sun
| 13870 M Jupiter
+
Star mass
Mass of the star Epsilon Lupi Aa is 13.24 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: 470 % R Sun
| 46.8 R Jupiter
+
Star size
Radius of the star Epsilon Lupi Aa is 4.7 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: 20500 K | 3.55 T Sun
+
Star temperature
Surface temperature of Epsilon Lupi Aa is 20500 K, which is 355 % 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: 3407 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

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

Epsilon Lupi Ab

Blue-white star
Spectral class: B3V

Basic characteristic

icon weight
Mass: 1146 % M Sun
| 12005 M Jupiter
+
Star mass
Mass of the star Epsilon Lupi Ab is 13.24 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: 380 % R Sun
| 37.8 R Jupiter
+
Star size
Radius of the star Epsilon Lupi Ab is 3.8 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: 18000 K | 3.12 T Sun
+
Star temperature
Surface temperature of Epsilon Lupi Ab is 18000 K, which is 312 % 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: 2197 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 iconAbsolute magnitude (V): -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

Epsilon Lupi B

White-Blue star
Spectral class: A5 V

Basic characteristic

icon weight
Mass: 764 % M Sun
| 8003 M Jupiter
+
Star mass
Mass of the star Epsilon Lupi B is 11.46 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: 490 % R Sun
| 48.5 R Jupiter
(estimate)
+
Star size
Radius of the star Epsilon Lupi B is not known. Its estimated value based on other similar stars is about 490 % 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: 8200 K
 (estimate)
+
Star temperature
Surface temperature of Epsilon Lupi B is estimated to be 8181 K, which is 142 % 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 iconAbsolute magnitude (V): -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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Epsilon Lupi Aa system structure

 Epsilon Lupi Aa
Epsilon Lupi Ab
Epsilon Lupi B

More about Epsilon Lupi Aa

       Epsilon Lupi Aa 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
ε Lupi, CPD−44° 7342, HD 136504, HIP 75264, HR 5708, SAO 225712
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External sources
icon study
XMM-Newton Perspective of the Unique Magnetic Binary- ε Lupi
Scientific study, Accepted: 13. 08. 2024
icon study

Frequently Asked Questions

How far is the Epsilon Lupi Aa system from the Sun?

The Epsilon Lupi Aa system is 512 light years or 157.0 parsecs from the Sun.

What galaxy is the Epsilon Lupi Aa star in?

The Epsilon Lupi Aa is in the Milky Way galaxy just like the Sun.

How many stars are in the Epsilon Lupi Aa system?

The Epsilon Lupi Aa system contains 3 stars.

What type of star is the Epsilon Lupi Aa?

The primary in the Epsilon Lupi Aa system is a Subgiant star.

What temperature is star Epsilon Lupi Aa?

The primary in the Epsilon Lupi Aa system has a temperature of 20500 K. Find out more about the temperature of stars in Stellar guide
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