What kind of star is Miaplacidus?
Miaplacidus, catalogued as Beta Carinae (β Car), appears in the official constellation Carina. Its apparent visual magnitude is 1.67, while its estimated distance is about 111 light-years. Astronomers classify the object as A2 IV. 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 09h 13m 12.00s, Dec −69° 43′ 02.9″ 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 Miaplacidus
Traditionally interpreted as a hybrid of Arabic miyāh, “waters,” and Latin placidus, “placid,” though the derivation is not linguistically certain.
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 Miaplacidus
Learn the Diamond Cross alongside Crux and the False Cross. Miaplacidus is one of Carina’s brightest points, northeast of Canopus; binoculars clarify the different patterns.
Strongly southern and circumpolar at many southern latitudes; generally unavailable to mid-northern observers. 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 Miaplacidus
- Miaplacidus is the second-brightest star in Carina after Canopus.
- It is a subgiant—more evolved than a main-sequence A star but not yet a full giant.
- It lies in the far-southern region once included in classical Argo Navis.
- Miaplacidus forms part of the Diamond Cross asterism.
- Its deep-southern declination makes it a characteristic Southern Hemisphere object.
Sources and further reading
Measurements are rounded for readability. Multiple systems, variable stars and distant supergiants can have component-specific or model-dependent values.