Question

Compare and contrast the apparent magnitude with the absolute magnitude of a star

Answer 1

The apparent magnitude of the star is the measure of the brightness of the star that is observed from the Earth whereas the absolute magnitude is the brightness observed from a distance of $32.6$ light years.

Explanation:

The magnitude of a star is defined as the amount of brightness delivered by the star. The amount of light or the brightness of the star that reaches the Earth is called as the apparent magnitude of the star.

The actual magnitude of the brightness of the star never reaches the Earth because there is a huge amount of loss in the brightness due to the density of the space and other matter present in the space.

The absolute magnitude of the star is termed as the brightness of the star as observed from the distance of about $10\text{ parsec}$. The light should reach at that distance and it's brightness should not reduce to zero after travelling this distance.

So, the amount of brightness observed at a point at a distance of $10\text{ parsec}$ or $32.6\text{ light years}$ from the star is termed as absolute magnitude.

Thus, The apparent magnitude of the star is the measure of the brightness of the star that is observed from the Earth whereas the absolute magnitude is the brightness observed from a distance of $32.6$ light years.

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Answer details:

Grade: High School

Subject: Physics

Chapter: Stars

Keywords:

star, magnitude, absolute, apparent, observed, Earth, brightness, loss, light, space, energy, 10 parsec, 32.6 light years.

Answer 2

Answer:

The apparent magnitude of an object only tells us how bright an object appears from Earth while the absolute magnitude is the apparent brightness of a star if it were viewed from a distance of 32.6 light-years

Explanation:

The apparent magnitude of an object only tells us how bright an object appears from Earth. Alternatively, if we know the distance and the apparent magnitude of a star, we can calculate its absolute magnitude. There are three factors which control the apparent brightness of a star as seen from Earth which are how big it is, how hot it is, and how far away it is. The absolute magnitude is a measure of the star's luminosity or the total amount of energy radiated by the star every second.