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Upsilon Andromedae
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Star Upsilon Andromedae

Binary star Upsilon Andromedae is located 44 light years away from the Sun. It consists of a yellow-white star and a red dwarf. There are multiple known exoplanets in this system.
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Sun distance
44 light years
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Upsilon Andromedae A

Yellow-White star, High proper motion star
Spectral class: F9V

Location +

Ascension iconRight ascension: 1h 36m 47.605s
Declination iconDeclination: 41° 24' 13.542'' (northern hemisphere)
Parallax iconParallax: 74.194
Distance iconSun distance: 43.960 ly | 13.5 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: 127 % M Sun
| 1330 M Jupiter
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Star mass
Mass of the star Upsilon Andromedae A is 1.27 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: 148 % R Sun
| 14.7 R Jupiter
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Star size
Radius of the star Upsilon Andromedae A is 1.48 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: 6269 K | 1.08 T Sun
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Star temperature
Surface temperature of Upsilon Andromedae A is 6269 K, which is 108 % 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: 3.12 billions years | 0.68 Sun
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Star age
Star Upsilon Andromedae A is 3.12 billion years old, which is about 0.68 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: 3.57 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): 4.1
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 Andromedae D

Red dwarf, High proper motion star
Spectral class: M4.5V

Basic characteristic

icon weight
Mass: 20 % M Sun
| 210 M Jupiter
+
Star mass
Mass of the star Upsilon Andromedae D is 1.27 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: 30 % R Sun
| 2.5 R Jupiter
(estimate)
+
Star size
Radius of the star Upsilon Andromedae D 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: 3200 K
 (estimate)
+
Star temperature
Surface temperature of Upsilon Andromedae D is estimated to be 3221 K, which is 55 % 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 Andromedae system structure

 Upsilon Andromedae A
Upsilon Andromedae A b 0.06 AU 540.4 M⊕ 14.6 R⊕ -
Upsilon Andromedae A c 0.83 AU 4444.3 M⊕ -
Upsilon Andromedae A d 2.53 AU 3258.5 M⊕ -
Upsilon Andromedae A e 5.25 AU 336.7 M⊕ -
Upsilon Andromedae D

More about Upsilon Andromedae

       Upsilon Andromedae 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
UCAC4 657-006214, ** LWR 1B, 2MASS J01365042+4123325, TIC 189576909, WDS J01368+4124D, WISEA J013650.24+412328.0, Titawin, 50 Andromedae, υ-Andromedæ, BD+40 332, CCDM 01367+4125, FK5 1045, GC 1948, GCTP 331.00, Gliese 61, Gl 61, HD 9826, HIC 7513, HIP 7513, HR 458, LTT 10561, SAO 37362, WDS 01368+4124A, 2MASS J01364784+4124200, Gaia DR2 348020448377061376, Gaia EDR3 348020482735930112
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External sources
icon study
icon study
simbad icon
Simbad database (UCAC4 657-006214)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 348020242217448576)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Upsilon Andromedae system from the Sun?

The Upsilon Andromedae system is 44 light years or 13.5 parsecs from the Sun.

What galaxy is the Upsilon Andromedae star in?

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

How many stars are in the Upsilon Andromedae system?

The Upsilon Andromedae system contains 2 stars.

What type of star is the Upsilon Andromedae?

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

What temperature is star Upsilon Andromedae?

The primary in the Upsilon Andromedae system has a temperature of 6269 K. Find out more about the temperature of stars in Stellar guide
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