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BY Draconis
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Star BY Draconis

Triple star system BY Draconis is located 54 light years away from the Sun. It is a system with 3 stars. For now, there are no known exoplanets in this star system.
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Sun distance
54 light years
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BY Draconis A

Orange star, BY Draconis variable
Spectral class: K4Ve

Location +

Ascension iconRight ascension: 18h 33m 56.101s
Declination iconDeclination: 51° 43' 3.690'' (northern hemisphere)
Parallax iconParallax: 60.381
Distance iconSun distance: 54.016 ly | 16.6 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: 79.2 % M Sun
| 830 M Jupiter
+
Star mass
Mass of the star BY Draconis A is 0.792 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: 80 % R Sun
| 7.6 R Jupiter
(estimate)
+
Star size
Radius of the star BY Draconis A is not known. Its estimated value based on other similar stars is about 80 % 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 iconTemperature: 4700 K
 (estimate)
+
Star temperature
Surface temperature of BY Draconis A is estimated to be 4660 K, which is 81 % 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

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

BY Draconis B

Orange star, , BY Draconis variable
Spectral class: K7.5Ve

Basic characteristic

icon weight
Mass: 69.7 % M Sun
| 730 M Jupiter
+
Star mass
Mass of the star BY Draconis B is 0.792 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
temperature iconTemperature: 3900 K
 (estimate)
+
Star temperature
Surface temperature of BY Draconis B is estimated to be 3934 K, which is 67 % 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

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

BY Draconis C

Red dwarf, High proper motion star
Spectral class: M5V

Location +

Distance iconDistance from the primary: 260 AU

Basic characteristic

icon weight
Mass: 20 % M Sun
| 188.6 M Jupiter
 (estimate)
+
Star mass
The mass of the star BY Draconis C is unknown. Based on its other characteristics, it is estimated to be about 20 % of the Sun's mass.

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: 20 % R Sun
| 2.2 R Jupiter
(estimate)
+
Star size
Radius of the star BY Draconis C is not known. Its estimated value based on other similar stars is about 20 % 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 iconTemperature: 3200 K
 (estimate)
+
Star temperature
Surface temperature of BY Draconis C is estimated to be 3207 K, which is 55 % 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

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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BY Draconis system structure

 BY Draconis A
BY Draconis B
BY Draconis C 260 AU

More about BY Draconis

      a BY Draconis variable. Stars from this category exhibit periodic variations in their luminosity. The variability is caused by a rotation which shows and hides starspots on the surface. BY Draconis 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. 

      BY Draconis is a BY Draconis variable. Stars from this category exhibit periodic variations in their luminosity. The variability is caused by a rotation which shows and hides starspots on the surface.
Other designations of this star
BY Dra, GJ 719, Gliese 719, BD+51 2402, HD 234677, LTT 15477, SAO 31048, HIP 91009, Gaia EDR3 2145277550935525760
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External sources
simbad icon
Simbad database (NAME BY Dra C)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 2145277550935526784)
Archive from the Gaia mission

Frequently Asked Questions

How far is the BY Draconis system from the Sun?

The BY Draconis system is 54 light years or 16.6 parsecs from the Sun.

What galaxy is the BY Draconis star in?

The BY Draconis is in the Milky Way galaxy just like the Sun.

How many stars are in the BY Draconis system?

The BY Draconis system contains 3 stars.

What type of star is the BY Draconis?

The primary in the BY Draconis system is a Orange star star.

What temperature is the BY Draconis?

The primary in the BY Draconis system has an effective temperature of K ( °C). Find out more about the temperature of stars in Stellar guide
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