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Fomalhaut
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Star Fomalhaut

Triple star system Fomalhaut is located 25 light years away from the Sun. It is a system with 3 stars. There is at least one exoplanet in this system.
Sun distance
25 light years
galaxy map

Fomalhaut A

White-Blue star
Spectral class: A3V C

Location

Ascension iconRight ascension: 22h 57m 39.047s
Declination iconDeclination: -29° 37' 20.05'' (southern hemisphere)
Parallax iconParallax: 129.81
Distance iconSun distance: 25.13 ly | 7.7 pc

Basic characteristic

icon weight
Mass: 192 % M Sun | 2011 M Jupiter
radius icon
Size: 184 % R Sun | 18.3 R Jupiter
temperature iconTemperature: 7671 K | 1.33 T Sun
time iconAge: 0.44 billions years | 0.1 Sun
luminosity iconLuminosity: 16.63 L Sun

Photometry

Magnitude iconApparent magnitude (V): 1.2
Magnitude iconAbsolute magnitude (V): 1.7
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
Absolute stellar magnitude in different parts of the electromagnetic spectrum from infrared (K band) to ultraviolet (U band).

Fomalhaut B

Orange star, BY Draconis variable
Spectral class: K5Vp

Basic characteristic

icon weight
Mass: 72.5 % M Sun | 759 M Jupiter
radius icon
Size: 63 % R Sun | 6.3 R Jupiter
temperature iconTemperature: 4573 K | 0.79 T Sun
time iconAge: 0.44 billions years | 0.1 Sun
luminosity iconLuminosity: 0.19 L Sun

Photometry

Magnitude iconApparent magnitude (V): 6.5
Magnitude iconAbsolute magnitude (V): 7.1
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
Absolute stellar magnitude in different parts of the electromagnetic spectrum from infrared (K band) to ultraviolet (U band).

Fomalhaut C

Red dwarf, , BY Draconis variable
Spectral class: M4V

Basic characteristic

icon weight
Mass: 18 % M Sun | 189 M Jupiter
radius icon
Size: 20 % R Sun | 1.9 R Jupiter (estimate)
temperature iconTemperature: 3143 K | 0.54 T Sun

Photometry

Magnitude iconApparent magnitude (V): 12.6
Magnitude iconAbsolute magnitude (V): 13.2
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
Absolute stellar magnitude in different parts of the electromagnetic spectrum from infrared (K band) to ultraviolet (U band).

Fomalhaut system structure

Fomalhaut A
 Fomalhaut C Dagon
unconfirmed
 177 AU 620500 days
Fomalhaut B
Fomalhaut C
More about Fomalhaut
      a BY Draconis variable. Stars from this category exhibit periodic variations in their luminosity. The variability is caused by a rotation which shows and hides starspots on the surface. Fomalhaut can be found in southern celestial hemisphere, and it is possible to see it with naked eye. The star is also observable from Northern America, Europe and Asia. 

      Fomalhaut is a BY Draconis variable. Stars from this category exhibit periodic variations in their luminosity. The variability is caused by a rotation which shows and hides starspots on the surface.
Other designations of this star
LP 876-10, Fomalhaut C, 2MASS J22480446-2422075, NLTT 54872, GSC 06964-01226, TW Piscis Austrini, TW PsA, Gl 879, HR 8721, CD -32°17321, HD 216803, LTT 9283, GCTP 5562.00, SAO 214197, CP(D)-32 6550, HIP 113283, α Piscis Austrini, α PsA, Alpha PsA, 24 Piscis Austrini, CPD −30° 6685, FK5 867, Gl 881, HD 216956, HIP 113368, HR 8728, SAO 191524, alf PsA
External sources
icon study
Debris disks around main-sequence stars
Scientific study, Accepted: 18. 03. 2024
icon study
Searching for Planets Orbiting Fomalhaut with JWST/NIRCam
Scientific study, Accepted: 23. 10. 2023
icon study
Spatially resolved imaging of the inner Fomalhaut disk using JWST/MIRI
Scientific study, 08. 05. 2023
simbad icon
Simbad database (* alf PsA C)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 6623351805412369024)
Archive from the Gaia mission
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