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Theta Cygni
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Star Theta Cygni

Multiple star system Theta Cygni is located 60 light years away from the Sun. It is a system with 4 stars. For now, there are no known exoplanets in this star system.
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Sun distance
60 light years
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Theta Cygni A

Yellow-White star, High proper motion star
Spectral class: F3+V

Location +

Ascension iconRight ascension: 19h 36m 26.528s
Declination iconDeclination: 50° 13' 20.184'' (northern hemisphere)
Parallax iconParallax: 54.270
Distance iconSun distance: 60.098 ly | 18.4 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: 135 % M Sun
| 1414 M Jupiter
+
Star mass
Mass of the star Theta Cygni A is 1.35 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: 149 % R Sun
| 14.8 R Jupiter
+
Star size
Radius of the star Theta Cygni A is 1.49 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: 6697 K | 1.16 T Sun
+
Star temperature
Surface temperature of Theta Cygni A is 6697 K, which is 116 % 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: 1.3 billions years | 0.28 Sun
+
Star age
Star Theta Cygni A is 1.3 billion years old, which is about 0.28 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: 4.265 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): 4.5
Magnitude iconAbsolute magnitude (V): 3.2
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

GJ 765 B

Red dwarf, , High proper motion star

Basic characteristic

icon weight
Mass: 40 % M Sun
| 366.6 M Jupiter
 (estimate)
+
Star mass
The mass of the star GJ 765 B 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 GJ 765 B 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
temperature iconTemperature: 3400 K
 (estimate)
+
Star temperature
Surface temperature of GJ 765 B is estimated to be 3433 K, which is 59 % 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): 13
Magnitude iconAbsolute magnitude (V): 11.7
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

GSC 03564-00642

Red dwarf, , , High proper motion star

Basic characteristic

icon weight
Mass: 40 % M Sun
| 429.5 M Jupiter
 (estimate)
+
Star mass
The mass of the star GSC 03564-00642 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: 28 % R Sun
| 2.8 R Jupiter
+
Star size
Radius of the star GSC 03564-00642 is 0.28 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: 3700 K | 0.64 T Sun
+
Star temperature
Surface temperature of GSC 03564-00642 is 3700 K, which is 64 % 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: 0.013 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): 13
Magnitude iconAbsolute magnitude (V): 11.7
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

Theta Cygni B

Red dwarf, flare star, , , , High proper motion star
Spectral class: K8V

Location +

Distance iconDistance from the primary: 46 AU

Basic characteristic

icon weight
Mass: 35 % M Sun
| 367 M Jupiter
+
Star mass
Mass of the star Theta Cygni B is 0.41 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: 36 % R Sun
| 3.6 R Jupiter
+
Star size
Radius of the star Theta Cygni B is 0.36 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: 3250 K | 0.56 T Sun
+
Star temperature
Surface temperature of Theta Cygni B is 3250 K, which is 56 % 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: 0.01 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): 12.9
Magnitude iconAbsolute magnitude (V): 11.6
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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Theta Cygni system structure

 Theta Cygni A
GJ 765 B
GSC 03564-00642
Theta Cygni B 46 AU

More about Theta Cygni

       Theta Cygni 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
2MASS 19362286+5013034, KIC 11918614, UCAC3 281-150921, 2MASS 19362771+5013419, KIC 11918644, 13 Cyg, θ Cyg, BD+49 3062, GJ 765, Gliese 765, HD 185395, HR 7469, SAO 31815, HIP 96441, Gaia DR3 2135110401277424384
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External sources
simbad icon
Simbad database (UCAC3 281-150921)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia DR3 2135110259540829824)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Theta Cygni system from the Sun?

The Theta Cygni system is 60 light years or 18.4 parsecs from the Sun.

What galaxy is the Theta Cygni star in?

The Theta Cygni is in the Milky Way galaxy just like the Sun.

How many stars are in the Theta Cygni system?

The Theta Cygni system contains 4 stars.

What type of star is the Theta Cygni?

The primary in the Theta Cygni system is a Yellow-White star star.

What temperature is star Theta Cygni?

The primary in the Theta Cygni system has a temperature of 6697 K. Find out more about the temperature of stars in Stellar guide
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30. 10. 2026
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The early architecture of planetary systems may be set at birth: a study of Sun-like stars found similar rates of star-planet misalignment across different stages of development. Other findings trace how water and carbon dioxide ice fade around young stars, why white-dwarf debris resists breaking into tiny pieces, and why a reported planet around Gliese 48 remains unconfirmed.
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