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V404 Cygni B
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Star V404 Cygni B

Red giant V404 Cygni B is located 10786 light years away from the Sun. It is a single star of spectral class K3 III, that has 70 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
10786 light years
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V404 Cygni B

Red giant
Spectral class: K3 III

Basic characteristic

icon weight
Mass: 70 % M Sun
| 733 M Jupiter
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Star mass
Mass of the star V404 Cygni B is 0.7 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: 600 % R Sun
| 59.7 R Jupiter
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Star size
Radius of the star V404 Cygni B is 6 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: 4800 K | 0.83 T Sun
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Star temperature
Surface temperature of V404 Cygni B is 4800 K, which is 83 % 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: 10.2 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

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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V404 Cygni B system structure

 V404 Cygni A
V404 Cygni B

More about V404 Cygni B

V404 Cygni B is is approximately 6 times bigger than the Sun and temperature on its surface is around 4800 K (4527 °C), which is about 83 % of Sun's temperature.
       V404 Cygni B can be found in northern celestial hemisphere.
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External sources
icon study
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Scientific study, Accepted: 29. 12. 2026
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icon study
icon study
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icon study
A Spatial Map of the Atmospheric Limb of a Hot Jupiter
Scientific study, Accepted: 14. 10. 2026
icon study
icon study
icon study
icon study
Peering into the Midplane of the DM Tau Disk using N2H+ and DCO+
Scientific study, Accepted: 13. 10. 2026

News from this star system

Molecular emission in the disk around DM Tauri reveals complex chemical processes
iconYesterday
Image: Molecular emission in the disk around DM Tauri reveals complex chemical processes
Observations of the disk around DM Tauri reveal how N2H+ and DCO+ molecules are distributed. The data show that external UV radiation and cosmic rays influence the chemical makeup of the disk out to 400 astronomical units, impacting how planets may form....
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Narrow ring of gas found near the young star HD 152384
iconYesterday
Image: Narrow ring of gas found near the young star HD 152384
A narrow ring of gas has been characterized around the young star HD 152384. Located at the dust sublimation radius, the ring likely formed from the collisions of rocky planetesimals, offering a new look at early planetary system evolution....
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Atmospheric composition of hot Jupiter KELT-2A b reveals chemical history
iconYesterday
Image: Atmospheric composition of hot Jupiter KELT-2A b reveals chemical history
New observations of hot Jupiter KELT-2A b confirm water vapor in its atmosphere. The planet shows a carbon-to-oxygen ratio similar to its host star but with overall lower metallicity, suggesting a complex migration history from far out in its star system....
Read article tag icon

Frequently Asked Questions

How far is the V404 Cygni B system from the Sun?

The V404 Cygni B system is 10786 light years or 3,306.9 parsecs from the Sun.

What galaxy is the V404 Cygni B star in?

The V404 Cygni B is in the Milky Way galaxy just like the Sun.

How many stars are in the V404 Cygni B system?

The V404 Cygni B is a single star, there are no other known stars in the system.

What type of star is the V404 Cygni B?

The star V404 Cygni B is a Red giant star.

What temperature is star V404 Cygni B?

The star V404 Cygni B has an effective temperature of 4800 K. Find out more about the temperature of stars in Stellar guide
Class of stars Red giant
White dwarfs are the hot, extremely dense stellar remnants left behind by stars that originally had masses between about 0.5 and 8 times the mass of the Sun during their main sequence lifetimes. After exhausting their nuclear fuel, these stars shed their outer layers and leave behind a compact core. Although white dwarfs contain between roughly 0.2 and 1.44 solar masses, this mass is packed into a volume comparable to that of an Earth-sized planet, making them some of the densest objects in the Universe.
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