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Epsilon Cygni Aa
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Star Epsilon Cygni Aa

Triple star system Epsilon Cygni Aa is located 73 light years away from the Sun. It is a system with 3 stars. For now, there are no known exoplanets in this star system.
Sun distance
73 light years
galaxy map

Epsilon Cygni Aa

Red giant
Spectral class: K0III

Location +

Ascension iconRight ascension: 20h 46m 12.682s
Declination iconDeclination: 33° 58' 12.925'' (northern hemisphere)
Parallax iconParallax: 44.860
Distance iconSun distance: 72.705 ly | 22.3 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: 200 % M Sun
| 5 M Jupiter
+
Star mass
Mass of the star Epsilon Cygni Aa is 2 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: 1082 % R Sun
| 107.7 R Jupiter
+
Star size
Radius of the star Epsilon Cygni Aa is 10.82 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: 4710 K | 0.82 T Sun
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Star temperature
Surface temperature of Epsilon Cygni Aa is 4710 K, which is 82 % 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: 1.5 billions years | 0.33 Sun
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Star age
Star Epsilon Cygni Aa is 1.5 billion years old, which is about 0.33 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: 62 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): 2.5
Magnitude iconAbsolute magnitude (V): 0.7
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 Cygni Ab

Red giant
Spectral class: K0III

Basic characteristic

icon weight
Mass: 180 % M Sun
| 1864.7 M Jupiter
 (estimate)
+
Star mass
The mass of the star Epsilon Cygni Ab is unknown. Based on its other characteristics, it is estimated to be about 180 % 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: 910 % R Sun
| 90.3 R Jupiter
(estimate)
+
Star size
Radius of the star Epsilon Cygni Ab is not known. Its estimated value based on other similar stars is about 910 % 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

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 Cygni C

Red dwarf, High proper motion star
Spectral class: M3

Basic characteristic

icon weight
Mass: 40 % M Sun
| 377.1 M Jupiter
 (estimate)
+
Star mass
The mass of the star Epsilon Cygni C is unknown. Based on its other characteristics, it is estimated to be about 40 % 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: 40 % R Sun
| 4 R Jupiter
(estimate)
+
Star size
Radius of the star Epsilon Cygni C is not known. Its estimated value based on other similar stars is about 40 % 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

Photometry

Magnitude iconApparent magnitude (V): 14.3
Magnitude iconAbsolute magnitude (V): 12.6
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 Cygni Aa system structure

 Epsilon Cygni Aa
Epsilon Cygni Ab
Epsilon Cygni C
More about Epsilon Cygni Aa
       Epsilon Cygni Aa can be found in northern celestial hemisphere, and it is possible to see it with naked eye. The star is easily observable from Northern America, Europe and Asia.
Other designations of this star
Aljanah, Gienah, ε Cyg, 53 Cygni, BD +33°4018, FK5 780, GCTP 4959.00, Gliese 806.1, Gl 806.1, HD 197989, HIC 102488, HIP 102488, HR 7949, LHS 5358, SAO 70474, WDS 20462+3358
External sources
simbad icon
Simbad database (* eps Cyg C)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 1869302674999983104)
Archive from the Gaia mission
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