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Upsilon Aquarii
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Star Upsilon Aquarii

Binary star Upsilon Aquarii is located 75 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
75 light years
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Upsilon Aquarii A

Yellow-White star, High proper motion star
Spectral class: F7V

Location +

Ascension iconRight ascension: 22h 34m 41.895s
Declination iconDeclination: -20° 42' 31.930'' (southern hemisphere)
Parallax iconParallax: 43.440
Distance iconSun distance: 75.083 ly | 23.0 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: 140 % M Sun
| 1467 M Jupiter
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Star mass
Mass of the star Upsilon Aquarii A is 1.4 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 Upsilon Aquarii 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: 6514 K | 1.13 T Sun
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Star temperature
Surface temperature of Upsilon Aquarii A is 6514 K, which is 113 % 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 Upsilon Aquarii 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
luminosity icon
Luminosity: 3.581 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): 5.2
Magnitude iconAbsolute magnitude (V): 3.4
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

Upsilon Aquarii B

Red dwarf, High proper motion star

Basic characteristic

icon weight
Mass: 30 % M Sun
| 272.4 M Jupiter
 (estimate)
+
Star mass
The mass of the star Upsilon Aquarii B is unknown. Based on its other characteristics, it is estimated to be about 30 % 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: 30 % R Sun
| 2.9 R Jupiter
(estimate)
+
Star size
Radius of the star Upsilon Aquarii 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 iconTemperature: 3300 K
 (estimate)
+
Star temperature
Surface temperature of Upsilon Aquarii B is estimated to be 3300 K, which is 57 % 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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Upsilon Aquarii system structure

 Upsilon Aquarii A
Upsilon Aquarii B

More about Upsilon Aquarii

       Upsilon Aquarii 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
υ Aqr, 59 Aquarii, BD−21 6251, FK5 849, HD 213845, HIP 111449, HR 8592, SAO 191235, Gaia EDR3 6628926642897745664
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External sources
simbad icon
Simbad database (* ups Aqr B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 6628926642897199744)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Upsilon Aquarii system from the Sun?

The Upsilon Aquarii system is 75 light years or 23.0 parsecs from the Sun.

What galaxy is the Upsilon Aquarii star in?

The Upsilon Aquarii is in the Milky Way galaxy just like the Sun.

How many stars are in the Upsilon Aquarii system?

The Upsilon Aquarii system contains 2 stars.

What type of star is the Upsilon Aquarii?

The primary in the Upsilon Aquarii system is a Yellow-White star star.

What temperature is star Upsilon Aquarii?

The primary in the Upsilon Aquarii system has a temperature of 6514 K. Find out more about the temperature of stars in Stellar guide
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 Gaia EDR3 6622318573720116864
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UPM J2241-2554
 - 7.5 ly

HD 212658
 - 8.9 ly

LP 820-19
 - 9 ly

LP 820-5
 - 10.5 ly
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