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Theta Persei
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Star Theta Persei

Binary star Theta Persei is located 36 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
36 light years
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Theta Persei A

Yellow-White star, High proper motion star
Spectral class: F8V

Location +

Ascension iconRight ascension: 2h 44m 12.535s
Declination iconDeclination: 49° 13' 40.987'' (northern hemisphere)
Parallax iconParallax: 89.685
Distance iconSun distance: 36.367 ly | 11.2 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: 113.8 % M Sun
| 1192 M Jupiter
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Star mass
Mass of the star Theta Persei A is 1.138 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: 132 % R Sun
| 13.1 R Jupiter
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Star size
Radius of the star Theta Persei A is 1.319 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: 6310 K | 1.09 T Sun
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Star temperature
Surface temperature of Theta Persei A is 6310 K, which is 109 % 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: 4 billions years | 0.87 Sun
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Star age
Star Theta Persei A is 4 billion years old, which is about 0.87 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: 2.235 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): 3.9
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

Theta Persei B

Red dwarf, High proper motion star
Spectral class: M1.5V

Basic characteristic

icon weight
Mass: 52.1 % M Sun
| 546 M Jupiter
+
Star mass
Mass of the star Theta Persei B is 1.138 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 R Jupiter
+
Star size
Radius of the star Theta Persei B is 0.498 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: 3572 K | 0.62 T Sun
+
Star temperature
Surface temperature of Theta Persei B is 3572 K, which is 62 % 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: 2.4 billions years | 0.52 Sun
+
Star age
Star Theta Persei B is 2.4 billion years old, which is about 0.52 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

Photometry

Magnitude iconApparent magnitude (V): 9.9
Magnitude iconAbsolute magnitude (V): 9.6
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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Theta Persei system structure

 Theta Persei A
Theta Persei B

More about Theta Persei

       Theta 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
2MASS J02441025+4913540, * tet Per, θ Per, BD+48°746, GJ 107, Gliese 107, CCDM J02441+4913, IDS 02374+4848, WDS J02442+4914, 13 Persei, HR 799, HD 16895, HIP 12777, FK5 93, GC 3277, PPM 45428, SAO 38288, Gaia EDR3 438829629114680704
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External sources
simbad icon
Simbad database (* tet Per B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 438829835272390784)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Theta Persei system from the Sun?

The Theta Persei system is 36 light years or 11.2 parsecs from the Sun.

What galaxy is the Theta Persei star in?

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

How many stars are in the Theta Persei system?

The Theta Persei system contains 2 stars.

What type of star is the Theta Persei?

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

What temperature is star Theta Persei?

The primary in the Theta Persei system has a temperature of 6310 K. Find out more about the temperature of stars in Stellar guide
Closest stars

 Iota Persei
 1.4 M☉ 3.2 ly

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 - 3.4 ly

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2MASS J0330+5413
 - 5.8 ly

Gliese 3147
 - 9.4 ly
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