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Circinus X-1

Star Circinus X-1

Binary star Circinus X-1 is located 31000 light years away from the Sun. It consists of a neutron star and a . For now, there are no known exoplanets in this star system.

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Nearby stars catalogue

Sun distance
31000 light years

Circinus X-1 A

Neutron star

Spectral class: B5-A0I D

Location +

Right ascension: 15h 20m 40.849s

Declination: -57° 10' 0.272'' (southern hemisphere)

Parallax: -0.260

Sun distance: 31,000.000 ly | 9,504.7 pc

Photometry

Apparent magnitude (V): 21.4

Absolute magnitude (V): 21.4

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

Circinus X-1 B

Unknown star type

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

Circinus X-1 system structure


	Circinus X-1 A
	Circinus X-1 B

More about Circinus X-1

       Circinus X-1 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
BR Cir, Circinus X-1, X Cir X-1, 4U 1516-56, 3A 1516-569, SWIFT J1521.0-5711, 2CXO J152040.8-571000, 1M 1516-569, SWIFT J1520.6-5710, XB 1516-569, GPS 1517-570, 2MASS J15204084-5710001, 2SXPS J152040.6-571002, 4XMM J152040.8-571000, GRS G322.50 +00.10, PBC J1520.6-5710, TIC 45754445, 1XRS 15168-569, 1H 1516-569, 1RXS J152040.8-571007, 2U 1516-56, [BM83] X1516-569, H 1510-56, 2S 1516-569, 3U 1516-56, Gaia DR3 5883218164517055488

External sources

Breaking the symmetry: X-ray polarization from a spreading layer on a tilted weakly magnetized neutron star

Scientific study, Accepted: 22. 10. 2026

News from this star system

Tilted rotation axes in weakly magnetized neutron stars change X-ray polarization signals

Today

Image: Tilted rotation axes in weakly magnetized neutron stars change X-ray polarization signals

A new model reveals that the tilt of a neutron star's rotation axis significantly alters its X-ray polarization. This insight helps explain data from the IXPE telescope, proving that the orientation of these objects is key to understanding their light....

Read article

Frequently Asked Questions

How far is the Circinus X-1 system from the Sun?

The Circinus X-1 system is 31000 light years or 9,504.7 parsecs from the Sun.

What galaxy is the Circinus X-1 star in?

The Circinus X-1 is in the Milky Way galaxy just like the Sun.

How many stars are in the Circinus X-1 system?

The Circinus X-1 system contains 2 stars.

What type of star is the Circinus X-1?

The primary in the Circinus X-1 system is a Neutron star star.

What temperature is the Circinus X-1?

The primary in the Circinus X-1 system has an effective temperature of K ( °C). Find out more about the temperature of stars in Stellar guide

Stellar Brief

24. 10. 2026

A planet’s helium atmosphere streams ahead of its orbit, while infrared observations reveal the hidden rhythms of its star. New work also shows how neutron-star tilt can reshape X-ray light, traces the past of massive blue supergiants, and maps cloudy and clear zones on the hot Jupiter WASP-43 b.

Today's Stellar Brief

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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