What kind of star is Antares?
Antares, catalogued as Alpha Scorpii (α Sco), appears in the official constellation Scorpius. Its apparent visual magnitude is variable, roughly 0.6–1.6, while its estimated distance is about 550 light-years; model-dependent. Astronomers classify the object as M1.5 Iab–Ib + B-type companion. 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 16h 29m 24.46s, Dec −26° 25′ 55.2″ 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 Antares
Greek anti-Ares, “rival of Ares” or Mars, referring to its conspicuous reddish colour.
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 Antares
Find the curved Scorpion low in the south on northern summer nights. Orange-red Antares sits near its middle. Splitting its hot blue companion requires a good telescope and excellent seeing.
Best on northern summer and southern winter evenings; low from northern Europe but high in southern skies. 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 Antares
- Antares is a red supergiant marking the heart of Scorpius.
- Its apparent brightness changes slowly and irregularly.
- A much hotter blue companion is difficult to see beside the glaring primary.
- Modern interferometry has spatially resolved its enormous atmosphere and wind.
- Antares has historical royal associations, though cultural identifications should be presented cautiously.
Sources and further reading
Measurements are rounded for readability. Multiple systems, variable stars and distant supergiants can have component-specific or model-dependent values.