Alpha Centauri A

Yellow star (spectral class G2V)

Location

Right ascension: 14h 39m 36.494s

Declination: -60° 50' 2.374'' (southern hemisphere)

Parallax: 743

Sun distance: 4.37 ly | 1.3 pc

Basic characteristic

Mass: 110 % M Sun

Size: 122 % R Sun

Temperature: 5753 K | 1 T Sun

Age: 5.2 billions years | 1.13 Sun

Luminosity: 1.519 L Sun

(No known exoplanets yet)

Photometry

Absolute magnitude (V): 4.4

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

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

Alpha Centauri B

Orange star (spectral class K1V)

Location

Distance from the primary: 17.493 AU

Basic characteristic

Mass: 90.7 % M Sun

Size: 86 % R Sun

Temperature: 5242 K | 0.91 T Sun

Age: 5.3 billions years | 1.15 Sun

Luminosity: 0.5002 L Sun

(No known exoplanets yet)

Photometry

Apparent magnitude (V): 1.3

Absolute magnitude (V): 5.8

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

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

Proxima Centauri

Red dwarf (spectral class M5.5 Ve)

flare star

Location

Distance from the primary: 8700 AU

Basic characteristic

Mass: 12.2 % M Sun

Size: 15.4 % R Sun | 1.5 R Jupiter

Temperature: 2883 K | 0.5 T Sun

Age: 4.85 billions years | 1.05 Sun

Luminosity: 0.00005 L Sun

3 exoplanets

Proxima Centauri d unconfirmed	0.03 AU	0.3 M⊕		5.2 days
Proxima Centauri b	0.05 AU	1.2 M⊕	1.1 R⊕	11.2 days
Proxima Centauri c	1.48 AU	7.8 M⊕		1928 days

Photometry

Apparent magnitude (V): 11.1

Absolute magnitude (V): 15.6

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

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

More about Alpha Centauri

      Alpha Centauri can be found in southern celestial hemisphere, and it is possible to see it with naked eye.

Other designations of this star
Alpha Centauri C, CCDM J14396-6050C, GCTP 3278.00, Gliese 551, HIP 70890, LFT 1110, LHS 49, LPM 526, LTT 5721, NLTT 37460, V645 Centauri, Toliman, α2 Centauri, HR 5460, HD 128621, LHS 51, HIP 71681, alf Cen B, Gliese 559, FK5 538, CD−60°5483, CCDM J14396-6050, GC 19728, α Cen A, Rigil Kentaurus, Rigil Kent, α1 Centauri, HR 5459, HD 128620, GCTP 3309.00, LHS 50, SAO 252838, HIP 71683, alf Cen A

External sources

Swarming Proxima Centauri: Optical Communication Over Interstellar Distances

Scientific study, Accepted: 13. 09. 2023

Stable Orbits in the Feeding Zone of the Planet Proxima Centauri c

Scientific study, Accepted: 01. 09. 2023

Simbad database (NAME Proxima Centauri)

Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)

Gaia database (Gaia EDR3 5853498713190525696)

Archive from the Gaia mission

Closest stars

Luhman 16	0.03 M☉	3.5 ly
Sol	1 M☉	4.2 ly
Barnard star	0.14 M☉	6.6 ly
WISE 0855-0714	0.01 M☉	7.8 ly
Ross 154	0.17 M☉	8.3 ly

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Star Alpha Centauri

Alpha Centauri A

Location

Basic characteristic

Photometry

Alpha Centauri B

Location

Basic characteristic

Photometry

Proxima Centauri

Location

Basic characteristic

3 exoplanets

Photometry

Flares from the closest star Proxima Centauri could stand in a way of habitability of exoplanet Proxima Centauri b