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Kapteyns star
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Star Kapteyns star

Cool subdwarf Kapteyns star is located 13 light years away from the Sun. It is a single star of spectral class M1VIp, that has 27 % of solar mass. There are multiple known exoplanets in this system.
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Sun distance
13 light years
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Kapteyns star

Cool subdwarf, High proper motion star
Spectral class: M1VIp

Location +

Ascension iconRight ascension: 5h 11m 50.393s
Declination iconDeclination: -45° 2' 37.726'' (southern hemisphere)
Parallax iconParallax: 254.199
Distance iconSun distance: 12.831 ly | 3.9 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: 27.4 % M Sun
| 287 M Jupiter
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Star mass
Mass of the star Kapteyns star is 0.274 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: 29 % R Sun
| 2.9 R Jupiter
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Star size
Radius of the star Kapteyns star is 0.291 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: 3698 K | 0.64 T Sun
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Star temperature
Surface temperature of Kapteyns star is 3698 K, which is 64 % 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: 11 billions years | 2.39 Sun
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Star age
Star Kapteyns star is 11 billion years old, which is about 2.39 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: 0.012 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): 8.9
Magnitude iconAbsolute magnitude (V): 10.9
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
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Kapteyns star system structure

 Kapteyns star
Kapteyns star b 0.17 AU (HZ) 4.8 M⊕ 0 R⊕ -
Kapteyns star c 0.31 AU 7 M⊕ -

More about Kapteyns star

Nearby star Kapteyns star is approximately 30 % of the size of Sun and temperature on its surface is around 3698 K (3425 °C), which is about 64 % of Sun's temperature.
       Kapteyns star can be found in southern celestial hemisphere, you cannot see it with naked eye, but you can observe this star with basic telescope. The star is also observable from Northern America, Europe and Asia.
Other designations of this star
Gliese 191, GJ 191, VZ Pictoris, HD 33793, CD-45°1841, CP(D)-44°612, SAO 217223, LHS 29, LTT 2200, LFT 395, GCTP 1181, HIP 24186, Gaia EDR3 4810594479418041856
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External sources
simbad icon
Simbad database (HD 33793)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 4810594479418041856)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Kapteyns star system from the Sun?

The Kapteyns star system is 13 light years or 3.9 parsecs from the Sun.

What galaxy is the Kapteyns star star in?

The Kapteyns star is in the Milky Way galaxy just like the Sun.

How many stars are in the Kapteyns star system?

The Kapteyns star is a single star, there are no other known stars in the system.

What type of star is the Kapteyns star?

The star Kapteyns star is a Cool subdwarf star.

What temperature is star Kapteyns star?

The star Kapteyns star has an effective temperature of 3698 K. Find out more about the temperature of stars in Stellar guide
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