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A Class A star is the third brightest type of main sequence star. They are typically colored white. They make up roughly 0.7% of main sequence stars.

A typical Class A star has a mass of 2 (1.6 to 2.9) solar masses, a radius of 1.7 (1.5 to 2.4) solar radii, a luminosity of 20 (6.5 to 54) solar luminosities, a surface temperature of 8500 K (7200 K to 9500 K), and a lifespan of 1 billion years.

They are hot, bright, and short-lived, which means that significant complex life is unlikely to develop around them. However, some simple life may have time to form in the habitable zone approximately 5 AU away from the parent star.


Stellar Classes
Φ · Ψ · Ω · Q · DE · GR · σ ς · Θ · N · D · BS · Y · T · L · M · C · S · QS · K · G · F · A · B · LBV · β · O · W · N · X · n0 · Exotic (Π · Σ · Γ · Δ · μ) · δ · I · TŻO · BL · ·

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