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Alpha Caeli
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Star Alpha Caeli

Binary star Alpha Caeli is located 66 light years away from the Sun. It consists of a yellow-white star and a red dwarf. For now, there are no known exoplanets in this star system.
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Sun distance
66 light years
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Alpha Caeli A

Yellow-White star, High proper motion star
Spectral class: F2V

Location +

Ascension iconRight ascension: 4h 40m 33.518s
Declination iconDeclination: -41° 51' 50.715'' (southern hemisphere)
Parallax iconParallax: 49.062
Distance iconSun distance: 66.478 ly | 20.4 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: 148 % M Sun
| 1550 M Jupiter
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Star mass
Mass of the star Alpha Caeli A is 1.48 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: 130 % R Sun
| 12.9 R Jupiter
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Star size
Radius of the star Alpha Caeli A is 1.3 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: 6991 K | 1.21 T Sun
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Star temperature
Surface temperature of Alpha Caeli A is 6991 K, which is 121 % 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: 0.9 billions years | 0.2 Sun
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Star age
Star Alpha Caeli A is 0.9 billion years old, which is about 0.2 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

Photometry

Magnitude iconApparent magnitude (V): 4.5
Magnitude iconAbsolute magnitude (V): 2.9
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 Caeli B

Red dwarf, , High proper motion star
Spectral class: M0.5

Basic characteristic

icon weight
Mass: 30 % M Sun
| 314 M Jupiter
+
Star mass
Mass of the star Alpha Caeli B is 1.48 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: 30 % R Sun
| 3.1 R Jupiter
(estimate)
+
Star size
Radius of the star Alpha Caeli B is not known. Its estimated value based on other similar stars is about 30 % 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: 3800 K | 0.66 T Sun
+
Star temperature
Surface temperature of Alpha Caeli B is 3800 K, which is 66 % 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

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 Caeli system structure

 Alpha Caeli A
Alpha Caeli B

More about Alpha Caeli

       Alpha Caeli 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
CCDM J04406-4152B, CD−42°1587B, CPD−42°513B, Gl 174.1 B, GJ 9164 B, IDS 04373-4203 B, CCDM J04406-4152A, CD−42°1587, CPD−42°513, FK5 1129, GC 5708, Gl 174.1 A, GJ 9164 A, Gliese 9164, HD 29875, HIP 21770, HR 1502, IDS 04373-4203 A, SAO 216926, Gaia EDR3 4815660547961306112
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Frequently Asked Questions

How far is the Alpha Caeli system from the Sun?

The Alpha Caeli system is 66 light years or 20.4 parsecs from the Sun.

What galaxy is the Alpha Caeli star in?

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

How many stars are in the Alpha Caeli system?

The Alpha Caeli system contains 2 stars.

What type of star is the Alpha Caeli?

The primary in the Alpha Caeli system is a Yellow-White star star.

What temperature is star Alpha Caeli?

The primary in the Alpha Caeli system has a temperature of 6991 K. Find out more about the temperature of stars in Stellar guide
Closest stars

 LHS 1678
 0.35 M☉ 3.4 ly

L 447-6
 - 5.9 ly

HD 29220
 - 6.1 ly

SCR J0509-4325
 - 6.5 ly

UPM J0448-3539
 - 7.4 ly
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stellar brief logoStellar Brief

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3. 11. 2026
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TOI-2298 b is about three times Earth’s size and circles its orange dwarf star inside the star’s conservative habitable zone, but uncertain orbits can make such labels misleading. New studies also examine the dust around HD 100546, a possible giant planet around HD 156295, a changing planetary orbit, and how computer models interpret exoplanet atmospheres.
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