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15 Sagittae
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Star 15 Sagittae

Binary star 15 Sagittae is located 58 light years away from the Sun. It consists of a yellow star and a brown dwarf. For now, there are no known exoplanets in this star system.
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Sun distance
58 light years
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15 Sagittae A

Yellow star, High proper motion star
Spectral class: G0V

Location +

Ascension iconRight ascension: 20h 4m 5.789s
Declination iconDeclination: 17° 4' 5.965'' (equatorial region)
Parallax iconParallax: 56.269
Distance iconSun distance: 57.963 ly | 17.8 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: 108 % M Sun
| 1131 M Jupiter
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Star mass
Mass of the star 15 Sagittae A is 1.08 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: 112 % R Sun
| 11.1 R Jupiter
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Star size
Radius of the star 15 Sagittae A is 1.115 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: 5883 K | 1.02 T Sun
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Star temperature
Surface temperature of 15 Sagittae A is 5883 K, which is 102 % 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: 2.5 billions years | 0.54 Sun
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Star age
Star 15 Sagittae A is 2.5 billion years old, which is about 0.54 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: 1.338 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): 5.8
Magnitude iconAbsolute magnitude (V): 4.5
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

15 Sagittae B

Brown dwarf, , High proper motion star
Spectral class: L4

Basic characteristic

icon weight
Mass: 6.6 % M Sun
| 69 M Jupiter
+
Star mass
Mass of the star 15 Sagittae B is 1.08 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: 10 % R Sun
| 1 R Jupiter
+
Star size
Radius of the star 15 Sagittae B is 0.1 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: 1600 K | 0.28 T Sun
+
Star temperature
Surface temperature of 15 Sagittae B is 1600 K, which is 28 % 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
luminosity icon
Luminosity: 0.000075 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): -1.3
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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15 Sagittae system structure

 15 Sagittae A
15 Sagittae B

More about 15 Sagittae

       15 Sagittae can be found in northern celestial hemisphere, and it is possible to see it with naked eye. The star is easily observable from Northern America, Europe and Asia.
Other designations of this star
15 Sge, BD+16°4121, GJ 779, Gliese 779, HD 190406, HIP 98819, HR 7672, SAO 105635, LFT 1517, LHS 3515, LTT 15872, Wolf 866, Gaia EDR3 1821708351374312064
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Frequently Asked Questions

How far is the 15 Sagittae system from the Sun?

The 15 Sagittae system is 58 light years or 17.8 parsecs from the Sun.

What galaxy is the 15 Sagittae star in?

The 15 Sagittae is in the Milky Way galaxy just like the Sun.

How many stars are in the 15 Sagittae system?

The 15 Sagittae system contains 2 stars.

What type of star is the 15 Sagittae?

The primary in the 15 Sagittae system is a Yellow star star.

What temperature is star 15 Sagittae?

The primary in the 15 Sagittae system has a temperature of 5883 K. Find out more about the temperature of stars in Stellar guide
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2MASS J20125255+1246315
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