The Sun is classified as a G-type main-sequence star (G dwarf) on the Hertzsprung-Russell (H-R) diagram. In the H-R diagram, stars are plotted based on their luminosity (or absolute magnitude) versus their surface temperature (or spectral class).
For the Sun:
- Surface Temperature: Approximately 5,800 K.
- Luminosity: About 1 solar luminosity (L☉), which is the standard for comparison among stars.
In the H-R diagram, G-type stars, including the Sun, are found in the main sequence region, which generally runs diagonally from the upper left (hot, bright stars) to the lower right (cool, dim stars). Specifically, the Sun is positioned in the middle of the main sequence due to its moderate temperature and brightness compared to other stars.