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BD-21 397
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Star BD-21 397

Orange star BD-21 397 is located 77 light years away from the Sun. It is a single star of spectral class K7V, that has 68 % of solar mass. There are multiple known exoplanets in this system.
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Sun distance
77 light years
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BD-21 397

Orange star, High proper motion star
Spectral class: K7V

Location +

Ascension iconRight ascension: 2h 13m 12.596s
Declination iconDeclination: -21° 11' 46.345'' (southern hemisphere)
Parallax iconParallax: 42.123
Distance iconSun distance: 77.430 ly | 23.7 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: 67.9 % M Sun
| 711 M Jupiter
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Star mass
Mass of the star BD-21 397 is 0.679 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: 75 % R Sun
| 7.4 R Jupiter
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Star size
Radius of the star BD-21 397 is 0.747 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: 405 K | 0.07 T Sun
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Star temperature
Surface temperature of BD-21 397 is 405 K, which is 7 % 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: 6.2 billions years | 1.35 Sun
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Star age
Star BD-21 397 is 6.2 billion years old, which is about 1.35 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): 9.8
Magnitude iconAbsolute magnitude (V): 8
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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BD-21 397 system structure

 BD-21 397
BD-21 397 b 2.63 AU 222.5 M⊕ 1891 days
BD-21 397 c 5.9 AU 763 M⊕ 6360 days

More about BD-21 397

Nearby star BD-21 397 is a main sequence star that fuses hydrogen atoms into helium. It is approximately 70 % of the size of Sun and temperature on its surface is around 405 K (132 °C), which is about 7 % of Sun's temperature.
       BD-21 397 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 1044, GJ 1044, HIP 10337, LTT 1141, TIC 268804174, WISEA J021312.45-211146.6, TYC 5861-2058-1, 2MASS J02131212-2111474, BD-210397, Gaia EDR3 5124636303346779008
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External sources
icon study
simbad icon
Simbad database (BD-21 397)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 5124636303346779008)
Archive from the Gaia mission

Frequently Asked Questions

How far is the BD-21 397 system from the Sun?

The BD-21 397 system is 77 light years or 23.7 parsecs from the Sun.

What galaxy is the BD-21 397 star in?

The BD-21 397 is in the Milky Way galaxy just like the Sun.

How many stars are in the BD-21 397 system?

The BD-21 397 is a single star, there are no other known stars in the system.

What type of star is the BD-21 397?

The star BD-21 397 is a Orange star star.

What temperature is star BD-21 397?

The star BD-21 397 has an effective temperature of 405 K. Find out more about the temperature of stars in Stellar guide
Closest stars

 HD 14001
 - 4.7 ly

Kappa Fornacis
 1.2 M☉ 4.8 ly

L 728-16
 - 4.8 ly

G 274-141
 - 6 ly

LP 769-58
 - 6 ly
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