When it comes to G-type main sequence stars our Sun is a?

stellar classification The Sun is a class G star; these are yellow, with surface temperatures of 5,000–6,000 K.

What does G2V stand for?

… Sun is classified as a G2 V star, with G2 standing for the second hottest stars of the yellow G class—of surface temperature about 5,800 kelvins (K)—and the V representing a main sequence, or dwarf, star, the typical star for this temperature class.

How many G-type main sequence stars are there?

As many as 512 or more stars of spectral type “G” (not including white dwarf stellar remnants) are currently believed to be located within 100 light-years or (or 30.7 parsecs) of Sol — including Sol itself.

How many G stars are in the Milky Way?

“Our Milky Way has as many as 400 billion stars, with seven per cent of them being G-type,” said co-author Matthews.

What is G sequence?

A G-type main-sequence star (Spectral type: G-V), often called a yellow dwarf, or G star, is a main-sequence star (luminosity class V) of spectral type G. Such a star has about 0.9 to 1.1 solar masses and an effective temperature between about 5,300 and 6,000 K. Like other main-sequence stars, a G-type main-sequence …

What is the luminosity class of a main sequence star?

Yerkes spectral classification

What is the luminosity of the sun?

1 L☉
Sun/Luminosity

What is 70 light years away?

Given that there are about 31.5 million seconds in a year, you can calculate that a single light-year equals around 5.8 trillion miles. So, saying a star is 70 light-years away, which is pretty typical for stars we see with the naked eye, means that star is about 406 trillion miles away.

What does M stand for in the Milky Way galaxy?

The Index Catalogue (IC) lists an additional 5,286 galaxies, nebulae, and star clusters discovered between 1888 and 1907. Names with the letter M are Messier objects, named after Charles Messier, a French astronomer.

What is the typical main sequence lifetime of a G-type star?

~ 10 billion years
The Sun, a G-type star with a main sequence lifetime of ~ 10 billion years, is currently 5 billion years old – about half way through its main sequence lifetime.

What does main sequence star mean according to the HR diagram?

The main sequence stretching from the upper left (hot, luminous stars) to the bottom right (cool, faint stars) dominates the HR diagram. They have low surface temperatures and high luminosities which, according to the Stefan-Boltzmann law, means they also have large radii.