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- When studying a celestial object we use two types of magnitudes. The apparent magnitude and absolute magnitude.
- The absolute magnitude is the magnitude of a celestial if it was observed from a distance of 10 parsecs.
- The apparent magnitude of a celestial object is the brightness measured by an observer at a specific distance from the object.
- The two magnitudes and distance to the object are related by,
Here d is the distance to the celestial object, m is the apparent magnitude, and M is the absolute magnitude.
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