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CM Draconis
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Star CM Draconis

Triple star system CM Draconis is located 48 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
48 light years
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CM Draconis A

Red dwarf, BY Draconis variable
Spectral class: M4.5V

Location +

Ascension iconRight ascension: 16h 34m 18.142s
Declination iconDeclination: 57° 10' 3.266'' (northern hemisphere)
Parallax iconParallax: 67.288
Distance iconSun distance: 48.472 ly | 14.9 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: 22.5 % M Sun
| 236 M Jupiter
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Star mass
Mass of the star CM Draconis A is 0.22501 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: 25 % R Sun
| 2.5 R Jupiter
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Star size
Radius of the star CM Draconis A is 0.25104 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: 3130 K | 0.54 T Sun
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Star temperature
Surface temperature of CM Draconis A is 3130 K, which is 54 % 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: 4.1 billions years | 0.89 Sun
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Star age
Star CM Draconis A is 4.1 billion years old, which is about 0.89 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: 0.00552 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): 12.9
Magnitude iconAbsolute magnitude (V): 12
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

CM Draconis B

Red dwarf, , BY Draconis variable

Location +

Distance iconDistance from the primary: 0.0173929 AU

Basic characteristic

icon weight
Mass: 21 % M Sun
| 220 M Jupiter
+
Star mass
Mass of the star CM Draconis B is 0.22501 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: 24 % R Sun
| 2.4 R Jupiter
+
Star size
Radius of the star CM Draconis B is 0.23745 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: 3120 K | 0.54 T Sun
+
Star temperature
Surface temperature of CM Draconis B is 3120 K, which is 54 % 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: 4.1 billions years | 0.89 Sun
+
Star age
Star CM Draconis B is 4.1 billion years old, which is about 0.89 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: 0.00486 L Sun
+
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 iconAbsolute magnitude (V): -0.9
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

EGGR 258

White dwarf, , , BY Draconis variable
Spectral class: DQ8

Location +

Distance iconDistance from the primary: 370 AU

Basic characteristic

temperature iconTemperature: 6200 K
 (estimate)
+
Star temperature
Surface temperature of EGGR 258 is estimated to be 6230 K, which is 107 % 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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CM Draconis system structure

 CM Draconis A
CM Draconis B 0.0173929 AU
EGGR 258 370 AU

More about CM 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. CM Draconis can be found in northern celestial hemisphere, however it is too dim to be seen with the naked eye or even a small telescope. 

      CM 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
V* CM Dra, Gliese 630.1, GJ 630.1, LP 101-15, NLTT 43148, WDS J16345+5709A, CCDM J16343+5710A, TIC 199574208, 2MASS 16342040+5709439, Gaia EDR3 1431176943768690816
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External sources
icon study
simbad icon
Simbad database (EGGR 258)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 1431176943768691328)
Archive from the Gaia mission

Frequently Asked Questions

How far is the CM Draconis system from the Sun?

The CM Draconis system is 48 light years or 14.9 parsecs from the Sun.

What galaxy is the CM Draconis star in?

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

How many stars are in the CM Draconis system?

The CM Draconis system contains 3 stars.

What type of star is the CM Draconis?

The primary in the CM Draconis system is a Red dwarf star.

What temperature is star CM Draconis?

The primary in the CM Draconis system has a temperature of 3130 K. Find out more about the temperature of stars in Stellar guide
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