Class

Temperature K

Conventional color

Mass (solar masses, M_ʘ)

Radius (solar radii, R)

Fraction of all main sequence stars

O

≥33,000 K

blue

≥16

≥6.6

~0.00003%

B

10,000 - 33,000 K

blue to blue white

2.1 - 16

1.8 - 6.6

0.13%

A

7500 - 10,000 K

white

1.4 - 2.1

1.4 - 1.8

0.6%

F

6000 - 7500 K

yellowish white

1.04 - 1.4

1.15 - 1.4

3%

G

5200 - 6000 K

yellow

0.8 - 1.04

0.96 - 1.15

7.6%

K

3700 - 5200 K

orange

0.45 - 0.8

0.7 - 0.96

12.1%

M

≤3700 K

red

≤0.45

≤0.7

76.45%