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Pi1 Ursae Minoris
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Star Pi1 Ursae Minoris

Binary star Pi1 Ursae Minoris is located 71 light years away from the Sun. It consists of 2 yellow star stars. For now, there are no known exoplanets in this star system.
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Sun distance
71 light years
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Pi1 Ursae Minoris A

Yellow star, High proper motion star
Spectral class: G1.5V(n)

Location +

Ascension iconRight ascension: 15h 29m 9.741s
Declination iconDeclination: 80° 26' 56.689'' (northern hemisphere)
Parallax iconParallax: 45.843
Distance iconSun distance: 71.147 ly | 21.8 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: 102 % M Sun
| 1069 M Jupiter
+
Star mass
Mass of the star Pi1 Ursae Minoris A is 1.02 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: 98 % R Sun
| 9.8 R Jupiter
+
Star size
Radius of the star Pi1 Ursae Minoris A is 0.98 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: 5771 K | 1 T Sun
+
Star temperature
Surface temperature of Pi1 Ursae Minoris A is 5771 K, which is 100 % 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: 9.22 billions years | 2 Sun
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Star age
Star Pi1 Ursae Minoris A is 9.22 billion years old, which is about 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: 0.929 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

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

Pi1 Ursae Minoris B

Yellow star, High proper motion star
Spectral class: G9V

Basic characteristic

icon weight
Mass: 92 % M Sun
| 964 M Jupiter
+
Star mass
Mass of the star Pi1 Ursae Minoris B is 1.02 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: 84 % R Sun
| 8.4 R Jupiter
+
Star size
Radius of the star Pi1 Ursae Minoris B is 0.84 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: 5408 K | 0.94 T Sun
+
Star temperature
Surface temperature of Pi1 Ursae Minoris B is 5408 K, which is 94 % 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: 0.520 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
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Pi1 Ursae Minoris system structure

 Pi1 Ursae Minoris A
Pi1 Ursae Minoris B

More about Pi1 Ursae Minoris

       Pi1 Ursae Minoris can be found in northern celestial hemisphere, you cannot see it with naked eye, but you can observe this star with basic telescope. The star is easily observable from Northern America, Europe and Asia.
Other designations of this star
BD+80°481, HD 139813, HIP 75829, SAO 2558, π1 UMi, ADS 9696, WDS J15292+8027, BD+80°480, HD 139777, HIP 75809, HR 5829, SAO 2556, * pi.01 UMi A, Gaia EDR3 1720995598827435648
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External sources
simbad icon
Simbad database (* pi.01 UMi B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 1720995598827436928)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Pi1 Ursae Minoris system from the Sun?

The Pi1 Ursae Minoris system is 71 light years or 21.8 parsecs from the Sun.

What galaxy is the Pi1 Ursae Minoris star in?

The Pi1 Ursae Minoris is in the Milky Way galaxy just like the Sun.

How many stars are in the Pi1 Ursae Minoris system?

The Pi1 Ursae Minoris system contains 2 stars.

What type of star is the Pi1 Ursae Minoris?

The primary in the Pi1 Ursae Minoris system is a Yellow star star.

What temperature is star Pi1 Ursae Minoris?

The primary in the Pi1 Ursae Minoris system has a temperature of 5771 K. Find out more about the temperature of stars in Stellar guide
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