Question

question 3
which of the following concerning the sun is its luminosity class?
main sequence (v)
giant (iii)
g2
1.0 lsun
suoergiant (ia)
5800k

Explanation:

The sun is a main - sequence star. In the Yerkes spectral classification (which includes luminosity classes), main - sequence stars are classified as luminosity class V. G2 is the spectral type (related to temperature and color), 1.0 Lsun is the luminosity (not the class), 5800K is the surface temperature, Giant (III) and SuperGiant (Ia) are luminosity classes for more luminous stars than the sun.

Answer:

main sequence (V)