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17 Cygni Aa
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Star 17 Cygni Aa

Multiple star system 17 Cygni Aa is located 68 light years away from the Sun. It is a system with 5 stars. For now, there are no known exoplanets in this star system.
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Sun distance
68 light years
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17 Cygni Aa

Yellow-White star, High proper motion star
Spectral class: F5.5IV-V

Location +

Ascension iconRight ascension: 19h 46m 25.633s
Declination iconDeclination: 33° 43' 32.181'' (northern hemisphere)
Parallax iconParallax: 47.652
Distance iconSun distance: 68.446 ly | 21.0 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: 124 % M Sun
| 1299 M Jupiter
+
Star mass
Mass of the star 17 Cygni Aa is 1.24 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: 154 % R Sun
| 15.3 R Jupiter
+
Star size
Radius of the star 17 Cygni Aa is 1.538 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: 6455 K | 1.12 T Sun
+
Star temperature
Surface temperature of 17 Cygni Aa is 6455 K, which is 112 % 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: 2.8 billions years | 0.61 Sun
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Star age
Star 17 Cygni Aa is 2.8 billion years old, which is about 0.61 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: 3.66 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

17 Cygni Ab

Orange star, , High proper motion star
Spectral class: K6 V

Basic characteristic

icon weight
Mass: 70 % M Sun
| 764.7 M Jupiter
 (estimate)
+
Star mass
The mass of the star 17 Cygni Ab 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: 80 % R Sun
| 7.6 R Jupiter
(estimate)
+
Star size
Radius of the star 17 Cygni Ab is not known. Its estimated value based on other similar stars is about 80 % 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: 4000 K
 (estimate)
+
Star temperature
Surface temperature of 17 Cygni Ab is estimated to be 4024 K, which is 69 % 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

17 Cygni Ba

Orange star, High proper motion star
Spectral class: K4

Basic characteristic

icon weight
Mass: 70 % M Sun
| 775.2 M Jupiter
 (estimate)
+
Star mass
The mass of the star 17 Cygni Ba 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
| 7.1 R Jupiter
(estimate)
+
Star size
Radius of the star 17 Cygni Ba 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: 4700 K
 (estimate)
+
Star temperature
Surface temperature of 17 Cygni Ba is estimated to be 4660 K, which is 81 % 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

17 Cygni Bb

Orange star, , High proper motion star
Spectral class: K3V

Basic characteristic

icon weight
Mass: 80 % M Sun
| 785.7 M Jupiter
 (estimate)
+
Star mass
The mass of the star 17 Cygni Bb is unknown. Based on its other characteristics, it is estimated to be about 80 % 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: 80 % R Sun
| 7.5 R Jupiter
(estimate)
+
Star size
Radius of the star 17 Cygni Bb is not known. Its estimated value based on other similar stars is about 80 % 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: 4800 K
 (estimate)
+
Star temperature
Surface temperature of 17 Cygni Bb is estimated to be 4796 K, which is 83 % 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

17 Cygni C

Red dwarf, , , High proper motion star
Spectral class: M0.4

Basic characteristic

icon weight
Mass: 60 % M Sun
| 576.2 M Jupiter
 (estimate)
+
Star mass
The mass of the star 17 Cygni C is unknown. Based on its other characteristics, it is estimated to be about 60 % 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: 60 % R Sun
| 5.6 R Jupiter
(estimate)
+
Star size
Radius of the star 17 Cygni C is not known. Its estimated value based on other similar stars is about 60 % 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: 3800 K
 (estimate)
+
Star temperature
Surface temperature of 17 Cygni C is estimated to be 3827 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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17 Cygni Aa system structure

 17 Cygni Aa
17 Cygni Ab
17 Cygni Ba
17 Cygni Bb
17 Cygni C

More about 17 Cygni Aa

       17 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
17 Cyg, BD+33°3587, GJ 9670, Gliese 9670, HD 187013, HIP 97295, HR 7534, SAO 68827, TYC 2660-4227-1, TIC 58445695, 2MASS J19462559+3343400, Gaia EDR3 2035035223783462400
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Frequently Asked Questions

How far is the 17 Cygni Aa system from the Sun?

The 17 Cygni Aa system is 68 light years or 21.0 parsecs from the Sun.

What galaxy is the 17 Cygni Aa star in?

The 17 Cygni Aa is in the Milky Way galaxy just like the Sun.

How many stars are in the 17 Cygni Aa system?

The 17 Cygni Aa system contains 5 stars.

What type of star is the 17 Cygni Aa?

The primary in the 17 Cygni Aa system is a Yellow-White star star.

What temperature is star 17 Cygni Aa?

The primary in the 17 Cygni Aa system has a temperature of 6455 K. Find out more about the temperature of stars in Stellar guide
Possible companions

 HD 186858
 - 0.3 ly
Closest stars

 HD 332518
 - 4.4 ly

G 210-2
 - 6 ly

G 207-30
 - 8 ly

HD 190771
 - 9.4 ly

LSPM J1917+2833
 - 9.6 ly
3D map of stellar neighborhood
List of all nearby stars
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exoplanet iconAbout Stellar Catalog

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Working with real data
icon Data in Stellar Catalog come from trusted scientific sources. Primary source is Gaia space telescope mapping the stars in Milky Way. Other sources include research papers, Simbad catalog and Exoplanet.eu database.
Estimated values
icon Objects listed in the Stellar Catalog often have values that are estimates. These estimates are determined using their known characteristics, such as spectral type, brightness across different wavelengths, distance from a star, and other factors.
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icon Stellar Catalog is continuously updated with new information from research papers. Stellar and planetary data are validated by automatic processes as well as humans.

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