<Tr> <Td> G8V </Td> <Td> 0.87 </Td> <Td> 4.46 </Td> <Td> 5,450 </Td> <Td> 0.740 </Td> </Tr> <Tr> <Td> G9V </Td> <Td> 0.84 </Td> <Td> 4.48 </Td> <Td> 5,370 </Td> <Td> 0.776 </Td> </Tr> <P> A G - type main - sequence star (Spectral type: G-V), often (and imprecisely) called a yellow dwarf, or G dwarf star, is a main - sequence star (luminosity class V) of spectral type G. Such a star has about 0.84 to 1.15 solar masses and surface temperature of between 5,300 and 6,000 K. Like other main - sequence stars, a G - type main - sequence star is converting the element hydrogen to helium in its core by means of nuclear fusion . The Sun, the star to which the Earth is gravitationally bound in the Solar System and the object with the largest apparent magnitude, is an example of a G - type main - sequence star (G2V type). Each second, the Sun fuses approximately 600 million tons of hydrogen to helium, converting about 4 million tons of matter to energy . Besides the Sun, other well - known examples of G - type main - sequence stars include Alpha Centauri A, Tau Ceti, and 51 Pegasi . </P> <P> The term yellow dwarf is a misnomer, because G - type stars actually range in color from white, for more luminous types like the Sun, to only very slightly yellow for the less massive and luminous G - type main - sequence stars . The Sun is in fact white, but appears yellow through Earth's atmosphere due to atmospheric Rayleigh scattering . In addition, although the term "dwarf" is used to contrast yellow main - sequence stars from giant stars, yellow dwarfs like the Sun outshine 90% of the stars in the Milky Way (which are largely much dimmer orange dwarfs, red dwarfs, and white dwarfs, the last being a stellar remnant). </P>

What is a g type main sequence star
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