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12 Persei
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Star 12 Persei

Binary star 12 Persei is located 78 light years away from the Sun. It consists of a yellow-white star and a yellow star. For now, there are no known exoplanets in this star system.
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Sun distance
78 light years
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12 Persei A

Yellow-White star, Spectroscopic binary
Spectral class: F9V

Location +

Ascension iconRight ascension: 2h 42m 14.891s
Declination iconDeclination: 40° 11' 35.243'' (northern hemisphere)
Parallax iconParallax: 41.796
Distance iconSun distance: 78.035 ly | 23.9 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: 138.2 % M Sun
| 1448 M Jupiter
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Star mass
Mass of the star 12 Persei A is 1.382 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: 155 % R Sun
| 15.4 R Jupiter
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Star size
Radius of the star 12 Persei A is 1.55 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: 6195 K | 1.07 T Sun
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Star temperature
Surface temperature of 12 Persei A is 6195 K, which is 107 % 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: 1.12 billions years | 0.24 Sun
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Star age
Star 12 Persei A is 1.12 billion years old, which is about 0.24 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: 3.02 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): 4.9
Magnitude iconAbsolute magnitude (V): 3
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

12 Persei B

Yellow star, , Spectroscopic binary

Location +

Distance iconDistance from the primary: 1.27 AU

Basic characteristic

icon weight
Mass: 124 % M Sun
| 1299 M Jupiter
+
Star mass
Mass of the star 12 Persei B is 1.382 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: 131 % R Sun
| 13 R Jupiter
+
Star size
Radius of the star 12 Persei B is 1.31 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: 6000 K | 1.04 T Sun
+
Star temperature
Surface temperature of 12 Persei B is 6000 K, which is 104 % 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: 1.86 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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12 Persei system structure

 12 Persei A
12 Persei B 1.27 AU

More about 12 Persei

       12 Persei 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
12 Per, BD+39° 610, FK5 2187, GJ 105.6 АВ, Gliese 105.6 АВ, HD 16739, HIP 12623, HR 788, SAO 55793, Gaia EDR3 335144892337326336
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Frequently Asked Questions

How far is the 12 Persei system from the Sun?

The 12 Persei system is 78 light years or 23.9 parsecs from the Sun.

What galaxy is the 12 Persei star in?

The 12 Persei is in the Milky Way galaxy just like the Sun.

How many stars are in the 12 Persei system?

The 12 Persei system contains 2 stars.

What type of star is the 12 Persei?

The primary in the 12 Persei system is a Yellow-White star star.

What temperature is star 12 Persei?

The primary in the 12 Persei system has a temperature of 6195 K. Find out more about the temperature of stars in Stellar guide
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