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A Class B star is the second-brightest type of main sequence star. They are typically colored blue-white, slightly less blue than O-type stars. They are fairly rare, making up only 0.13% of main-sequence stars.

A typical Class B star has a mass of 9 (2 to 16) solar masses, a radius of 4 (2 to 7) solar radii, a luminosity of 1,000 (25 to 30,000) solar luminosities, a surface temperature of 44,310 F or 24,599 C (17,540 F to 53,540 F), and a lifespan of 10,000,000 years.

The habitable zone of a typical Class B star is on the order of 50 AU. While they also possess short lifespans, making planets and life rare, there are a few examples of B-type star systems, including HIP 78530.


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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