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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.
Sun distance
54 light years
galaxy map

BY Draconis A

Orange star, BY Draconis variable
Spectral class: K4Ve

Location +

Ascension iconRight ascension: 18h 33m 56.101s
Declination iconDeclination: 51° 43' 3.69'' (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

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

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
| 178.1 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
| 2.1 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

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 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
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
Closest stars

 EGGR 374
 - 3.4 ly

BD+45 2743
 - 6.3 ly

BD+45 2688
 - 7.2 ly

2MASS J1807+5015
 - 7.3 ly

Wolf 1108
 - 9.5 ly
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