What kind of star is Fomalhaut?
Fomalhaut, catalogued as Alpha Piscis Austrini (α PsA), appears in the official constellation Piscis Austrinus. Its apparent visual magnitude is 1.16, while its estimated distance is about 25.1 light-years. Astronomers classify the object as A3 V. These labels describe temperature, luminosity class or system components; they should not be read as a claim that every naked-eye point is a single isolated star.
The coordinate pair RA 22h 57m 39.05s, Dec −29° 37′ 20.1″ fixes the object’s direction on the celestial sphere for the J2000 reference epoch. Right ascension works like celestial longitude measured in hours, while declination works like latitude north or south of the celestial equator. Proper motion and improved measurements can refine catalogue positions, but these coordinates are sufficiently precise for a finder chart or planetarium search.
The name Fomalhaut
Arabic fam al-ḥūt means “mouth of the fish.”
Modern professional catalogues retain identifiers such as the Bayer designation alongside a proper name. The International Astronomical Union standardizes which name belongs to which component—an important distinction for systems whose combined light looks like one star from Earth.
How to find Fomalhaut
Use the western side of the Great Square of Pegasus as a rough pointer southward. Fomalhaut is the isolated bright star low in the south on northern autumn evenings.
Best in northern autumn and southern spring; visible from most inhabited latitudes but low from far northern Europe. Visibility on a particular night still depends on latitude, season, time, horizon obstructions, weather and local light pollution. Use the interactive atlas below to check the surrounding field before observing.
Interesting facts about Fomalhaut
- Fomalhaut is sometimes called the Lonely One because it dominates a sparse part of the autumn sky.
- It is one of the nearest first-magnitude stars.
- Webb observations revealed a structured debris system with three nested belts.
- The object once announced as Fomalhaut b is now widely interpreted as an expanding collision-generated dust cloud.
- Fomalhaut A shares motion with two widely separated companions, forming an extremely broad system.
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Sources and further reading
Measurements are rounded for readability. Multiple systems, variable stars and distant supergiants can have component-specific or model-dependent values.