Luminosity is also referred to as the absolute magnitude or absolute brightness of an object. It is the real brightness of a celestial object. The apparent magnitude or apparent brightness of an object is a measure of how bright an object appears to be to an observer.
Just so, what is an example of absolute magnitude?
Absolute magnitude is defined to be the apparent magnitude an object would have if it were located at a distance of 10 parsecs. So for example, the apparent magnitude of the Sun is -26.7 and is the brightest celestial object we can see from Earth.
What is the absolute magnitude of a star?
Absolute magnitude is a concept that was invented after apparent magnitude when astronomers needed a way to compare the intrinsic, or absolute brightness of celestial objects. The apparent magnitude of an object only tells us how bright an object appears from Earth.
What is the difference between apparent and absolute magnitude?
Astronomers define star brightness in terms of apparent magnitude — how bright the star appears from Earth — and absolute magnitude — how bright the star appears at a standard distance of 32.6 light-years, or 10 parsecs.