The absolute magnitude of VY Canis Majoris is around -7.6. This massive red hypergiant star is one of the largest known stars in the universe, with a radius around 1420 times that of the Sun.
The absolute magnitude is a measure of the star's luminosity hence the smaller the size the less the absolute magnitude.
The absolute magnitude of a star depends on the size and temperature; a large cooler star can generate as much light as a small very hot star.
The equation for the magnitude of a star is; M=m-5log(d/10) where:M - Absolute magnitude (The brightness of a star viewed 10 parsecs away)m - Apparent magnitude (The brightness of a star as viewed from Earth)d - Distance from the star (Pc)
One dimmer star can be closer than a brighter star that is far away. Light flux decreases as the square of the distance. A star that is three times as far away will have to shine nine times brighter than the closer star (absolute magnitude) to appear to have the same magnitude (apparent magnitude). Because apparent magnitude is the brightness of a star, as seen from Earth, whereas absolute magnitude is the brightness of a star as seen from the same distance - about 32.6 light years away.
The absolute magnitude of VY Canis Majoris is around -7.6. This massive red hypergiant star is one of the largest known stars in the universe, with a radius around 1420 times that of the Sun.
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the astronomers use Absolute magnitude
Constellations don't have an absolute magnitude. That is a property of individual stars.
The apparent magnitude is how bright the star appears to us, but stars are all at different distances so that a star that is really bright might look dim because it is very far away. So the absolute magnitude measures how bright the star would look if it was placed at a standard distance of 10 parsecs. When the absolute magnitude is greater than the apparent magnitude, it just means that it is closer than 10 pc. The brightest stars have absolute magnitudes around -7.
The question is: Why is the apparent magnitude of some stars less than their absolute magnitude. Or: Why do some stars not look as bright as they really are ? The answer is: Because they're so far away from us.
The absolute magnitude is a measure of the star's luminosity hence the smaller the size the less the absolute magnitude.
Most "yellow" stars fall into the classification of type G - the same as our Sun.They have an absolute magnitude of around 5.
Absolute magnitude
Its absolute magnitude is -1.20.Its magnitude from our point of view is +3.65.
Absolute magnitude: they are extremely bright. Temperature: their surface temperature is fairly low.
The absolute magnitude of a star depends on the size and temperature; a large cooler star can generate as much light as a small very hot star.