Eta Carinae η Carinae abbreviated to η Car formerly known as Eta Argus is a stellar system containing at least two stars with a combined luminosity greater than five million times that of the Sun located around 7500 light-years 2300 parsecs distant in the constellation CarinaPreviously a 4th-magnitude star it brightened in 1837 to become brighter than Rigel. Absolute magnitude M is a measure of the luminosity of a celestial object on an inverse logarithmic astronomical magnitude scale.
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The next diagram shows the Sun after it has exhausted its core hydrogen and left the main sequence making it a subgiant with energy generated by hydrogen burning in a shell around an inert helium core.
. An objects absolute magnitude is defined to be equal to the apparent magnitude that the object would have if it were viewed from a distance of exactly 10 parsecs 326 light-years without extinction or dimming of its light due to absorption by. The diagram at the left represents the Sun or any other one-solar-mass star as a hydrogen-burning main-sequence star with spectral type G and one solar luminosity.
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