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Eta Carinae A
Details
Eta Carinae A is the luminous blue variable primary in the Eta Carinae system, buried inside the Carina Nebula. Its dense wind makes the star’s surface hard to define, so this record uses an approximate visible stellar disk rather than a clean hydrostatic radius.
Eta Carinae A is not the kind of star that sits inside a clean, round disk. It is a luminous blue variable, one of the most unstable kinds of massive stars known, buried inside the violent Eta Carinae system in the Carina Nebula. Before you even get to its numbers, the important fact is that this is a star in upheaval.
In the nineteenth century, Eta Carinae went through the Great Eruption, a colossal outburst that briefly made the system one of the brightest sights in the sky. The material thrown off in that event helped form the Homunculus Nebula, and the primary star still drives an exceptionally dense wind. That matters because Eta Carinae A is hard to define with the clean edge we instinctively expect from a star.
That is why Eta Carinae A is so compelling. It shows that the most massive stars do not simply shine and then die; they can shed huge amounts of matter, reshape their surroundings, and become difficult to separate from the storm they create around themselves. This is a star caught in a violent phase of stellar life rather than a tidy, stable sphere.
124million km
Visual creditscaleofspace.org / CC BY-NC 4.0
Key facts
- Category
- Stars
- Object class
- Luminous blue variable
- Mass
- ~100 solar masses
- Host
- Eta Carinae system
- Scale fact
- ~334 million kmdiameter
- Estimated age
- ~3 million years
- Composition
- Hydrogen and helium
- Temperature
- ~15,000–25,000 K surface
Scale context
Where Eta Carinae A sits on the full axis
By size on the journey, Eta Carinae A sits between Deneb and Betelgeuse. The band below uses nearby Stars objects for context.
Shared physical scale
1.29billion km
Together, these objects make the size change around Eta Carinae A easy to compare at a glance.
Between the smallest and the largest, perspective is everything.
About
Scale of Space is a scroll-based journey through the universe, placing objects on a single logarithmic scale so you can compare size across an unbroken range.
Guides turn parts of that scale into curated essays, while focused views let you explore the same range through specific groups of objects.