What Spectral Class Is the Sun?

The sun's spectral classification is G2, meaning that it is part of the third-hottest type of class G stars, with G0 stars being the hottest. The G2 classification indicates a temperature of about 5,800 Kelvin.

The letter classifications of stars are O, B, A, F, G, K and M, with O class stars being the hottest and M class stars the coolest.

In addition to its spectral classification, the sun is a main sequence star, indicated with the suffix V. This means that it is part of the main class of stars, those that are not giants or dwarfs and that fuse hydrogen inside their cores.