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Zeta Aquilae
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Star Zeta Aquilae

Binary star Zeta Aquilae is located 85 light years away from the Sun. It consists of a subgiant and a red dwarf. For now, there are no known exoplanets in this star system.
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Sun distance
85 light years
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Zeta Aquilae A

Subgiant, High proper motion star
Spectral class: A0IV-Vnn

Location +

Ascension iconRight ascension: 19h 5m 24.605s
Declination iconDeclination: 13° 51' 46.992'' (equatorial region)
Parallax iconParallax: 38.233
Distance iconSun distance: 85.308 ly | 26.2 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: 237 % M Sun
| 2483 M Jupiter
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Star mass
Mass of the star Zeta Aquilae A is 2.37 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: 227 % R Sun
| 22.6 R Jupiter
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Star size
Radius of the star Zeta Aquilae A is 2.27 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: 9620 K | 1.66 T Sun
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Star temperature
Surface temperature of Zeta Aquilae A is 9620 K, which is 166 % 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: 39.4 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): 3
Magnitude iconAbsolute magnitude (V): 0.9
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

Zeta Aquilae B

Red dwarf, High proper motion star

Location +

Distance iconDistance from the primary: 185.1 AU

Basic characteristic

icon weight
Mass: 50 % M Sun
| 524 M Jupiter
+
Star mass
Mass of the star Zeta Aquilae B is 2.37 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: 50 % R Sun
| 5.2 R Jupiter
(estimate)
+
Star size
Radius of the star Zeta Aquilae B is not known. Its estimated value based on other similar stars is about 50 % 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: 3700 K
 (estimate)
+
Star temperature
Surface temperature of Zeta Aquilae B is estimated to be 3702 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

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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Zeta Aquilae system structure

 Zeta Aquilae A
Zeta Aquilae B 185.1 AU

More about Zeta Aquilae

       Zeta Aquilae 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
Okab (primary), Zeta Aql, ζ Aql, 17 Aql, BD+13 3899, FK5 716, GJ 4095, Gliese 4095, HD 177724, HIP 93747, HR 7235, SAO 104461, WDS J19054+1352A, zet Aql, Gaia DR3 4314399312979641728
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External sources
simbad icon
Simbad database (* zet Aql B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 4314399312966563968)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Zeta Aquilae system from the Sun?

The Zeta Aquilae system is 85 light years or 26.2 parsecs from the Sun.

What galaxy is the Zeta Aquilae star in?

The Zeta Aquilae is in the Milky Way galaxy just like the Sun.

How many stars are in the Zeta Aquilae system?

The Zeta Aquilae system contains 2 stars.

What type of star is the Zeta Aquilae?

The primary in the Zeta Aquilae system is a Subgiant star.

What temperature is star Zeta Aquilae?

The primary in the Zeta Aquilae system has a temperature of 9620 K. Find out more about the temperature of stars in Stellar guide
Closest stars

 Gaia EDR3 4320566164397463040
 - 4.1 ly

Gaia EDR3 4320467655052340992
 - 4.5 ly

Gaia DR3 4512752207042189312
 - 4.7 ly

V1688 Aquilae
 - 5.7 ly

LSPM J1858+1504
 - 5.9 ly
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