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4U 1822-371

Star 4U 1822-371

Binary star 4U 1822-371 is located 23195 light years away from the Sun. It consists of a neutron star and a red dwarf. For now, there are no known exoplanets in this star system.

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Nearby stars catalogue

Sun distance
23195 light years

4U 1822-371 A

Neutron star

Location +

Right ascension: 18h 25m 46.814s

Declination: -37° 6' 18.570'' (southern hemisphere)

Parallax: 0.141

Sun distance: 23,194.560 ly | 7,111.5 pc

Basic characteristic

Mass: 197 % M Sun

Photometry

Absolute stellar magnitude in different parts of the electromagnetic spectrum from infrared (K band) to ultraviolet (U band).

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

4U 1822-371 B

Red dwarf

Basic characteristic

Mass: 50 % M Sun

Photometry

Absolute stellar magnitude in different parts of the electromagnetic spectrum from infrared (K band) to ultraviolet (U band).

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

4U 1822-371 system structure


	4U 1822-371 A
	4U 1822-371 B

More about 4U 1822-371

       4U 1822-371 can be found in southern celestial hemisphere, however it is too dim to be seen with the naked eye or even a small telescope.

Other designations of this star
4U1822, Gaia DR3 6728016172687965568

External sources

X-ray Doppler tomography of Fe K emission in a low-mass X-ray binary 4U 1822-371 - a localized reflector at the accretion stream-disk overflow

Scientific study, Accepted: 04. 03. 2026

News from this star system

X-ray source in 4U 1822-371 found where the stream of matter from secondary star hits the neutron star's disk

7. 3. 2026

Image: X-ray source in 4U 1822-371 found where the stream of matter from secondary star hits the neutron star

A new X-ray map of the binary system 4U 1822-371 reveals that the main reflector is at the accretion stream-disk overflow, not in the disk or on the stars. This study opens new ways to explore the structures around neutron stars....

Read article

Frequently Asked Questions

How far is the 4U 1822-371 system from the Sun?

The 4U 1822-371 system is 23195 light years or 7,111.5 parsecs from the Sun.

What galaxy is the 4U 1822-371 star in?

The 4U 1822-371 is in the Milky Way galaxy just like the Sun.

How many stars are in the 4U 1822-371 system?

The 4U 1822-371 system contains 2 stars.

What type of star is the 4U 1822-371?

The primary in the 4U 1822-371 system is a Neutron star star.

What temperature is the 4U 1822-371?

The primary in the 4U 1822-371 system has an effective temperature of K ( °C). Find out more about the temperature of stars in Stellar guide

About Stellar Catalog

Working with real data

Data in Stellar Catalog come from trusted scientific sources. Primary source is Gaia space telescope mapping the stars in Milky Way. Other sources include research papers, Simbad catalog and Exoplanet.eu database.

Estimated values

Objects listed in the Stellar Catalog often have values that are estimates. These estimates are determined using their known characteristics, such as spectral type, brightness across different wavelengths, distance from a star, and other factors.

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