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Alpha Circini
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Star Alpha Circini

Binary star Alpha Circini is located 53 light years away from the Sun. It consists of a orange star and a white-blue star. For now, there are no known exoplanets in this star system.
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Sun distance
53 light years
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Alpha Circini A

White-Blue star
Spectral class: A7VpSrCrEu

Location +

Ascension iconRight ascension: 14h 42m 29.938s
Declination iconDeclination: -64° 58' 34.239'' (southern hemisphere)
Parallax iconParallax: 60.993
Distance iconSun distance: 53.474 ly | 16.4 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: 160 % M Sun
| 1676 M Jupiter
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Star mass
Mass of the star Alpha Circini A is 1.6 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: 197 % R Sun
| 19.6 R Jupiter
+
Star size
Radius of the star Alpha Circini A is 1.967 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: 7500 K | 1.3 T Sun
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Star temperature
Surface temperature of Alpha Circini A is 7500 K, which is 130 % 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: 0.012 billions years | 0 Sun
+
Star age
Star Alpha Circini A is 0.012 billion years old, which is about 0 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: 10.51 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): 3.2
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

Alpha Circini B

Orange star, High proper motion star
Spectral class: K5V

Basic characteristic

icon weight
Mass: 70 % M Sun
| 743.8 M Jupiter
 (estimate)
+
Star mass
The mass of the star Alpha Circini B is unknown. Based on its other characteristics, it is estimated to be about 70 % 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: 70 % R Sun
| 7.2 R Jupiter
(estimate)
+
Star size
Radius of the star Alpha Circini B is not known. Its estimated value based on other similar stars is about 70 % 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: 4400 K
 (estimate)
+
Star temperature
Surface temperature of Alpha Circini B is estimated to be 4434 K, which is 76 % 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): 8.5
Magnitude iconAbsolute magnitude (V): 7.4
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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Alpha Circini system structure

 Alpha Circini A
Alpha Circini B

More about Alpha Circini

       Alpha Circini can be found in southern celestial hemisphere, and it is possible to see it with naked eye.
Other designations of this star
17. G Circini, CD−64° 86, HD 128898, HIP 71908, HR 5463, SAO 252853, alf Cir, Gaia EDR3 5849837854861497856
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External sources
simbad icon
Simbad database (* alf Cir B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 5849837820492182272)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Alpha Circini system from the Sun?

The Alpha Circini system is 53 light years or 16.4 parsecs from the Sun.

What galaxy is the Alpha Circini star in?

The Alpha Circini is in the Milky Way galaxy just like the Sun.

How many stars are in the Alpha Circini system?

The Alpha Circini system contains 2 stars.

What type of star is the Alpha Circini?

The primary in the Alpha Circini system is a White-Blue star star.

What temperature is star Alpha Circini?

The primary in the Alpha Circini system has a temperature of 7500 K. Find out more about the temperature of stars in Stellar guide
Closest stars

 Gaia EDR3 5851167679807239808
 - 4 ly

Gaia EDR3 5826576346314528768
 - 6.4 ly

Gaia DR2 5825187972369019264
 - 6.7 ly

Gaia DR2 5864005027836957952
 - 7 ly

L 153-43
 - 8.5 ly
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