What kind of star is Adhara?
Adhara, catalogued as Epsilon Canis Majoris (ε CMa), appears in the official constellation Canis Major. Its apparent visual magnitude is 1.50, while its estimated distance is about 430 light-years. Astronomers classify the object as B2 II. 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 06h 58m 37.55s, Dec −28° 58′ 19.5″ 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 Adhara
From Arabic al-ʿadhārā, “the maidens” or “virgins,” historically associated with a small Canis Major star group.
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 Adhara
Look south of Sirius in the lower body or leg of Canis Major. Northern observers should choose a transparent winter night. Its faint close companion is a demanding unequal double.
Visible from both hemispheres but substantially higher and easier from southern latitudes. 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 Adhara
- Although Sirius appears brighter from Earth, Adhara is intrinsically vastly more luminous.
- Reconstructions indicate that Adhara passed much nearer the Solar System millions of years ago and then appeared extraordinarily bright.
- It is a hot blue-white bright giant and an important ultraviolet source.
- Adhara has a faint visual companion separated by only several arcseconds.
- Its southerly declination rewards observers at lower latitudes.
Sources and further reading
Measurements are rounded for readability. Multiple systems, variable stars and distant supergiants can have component-specific or model-dependent values.