Stellar Classification

For simple navigational purposes stars are classified using the Harvard spectral system based on spectral characteristics. Additional coding specific to luminosity (as used by the Morgan-Keenan MK classification system) is not used.

Class

Colour Temperature

Chromaticity

O

≥ 30,000 K

blue

B

10,000–30,000 K

blue white

A

7,500–10,000 K

white

F

6,000–7,500 K

yellow white

G

5,200–6,000 K

yellow

K

3,700–5,200 K

light orange

M

2,400–3,700 K

orange red
stellar cartography