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The Sun, obviously, is the brightest object in the sky when observed from Earth, so it has the lowest apparent magnitude value of -26.7.
The faintest objects that a human eye can detect have apparent magnitudes of about 6.
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If the apparent magnitude of a star at a distance parsecs away from us is given by , then the absolute magnitude is calculated from apparent magnitude using the following formula: From the definition of absolute magnitude, the absolute magnitude is the apparent magnitude when we observe the object from 10 parsecs away. Absolute magnitude gives the brightness of an object as seen from 10 parsecs away.
Image Courtesy “This Hubble Space Telescope image shows Sirius A, the brightest star in our nighttime sky, along with its faint, tiny stellar companion, Sirius B…” by NASA, ESA, H.
Absolute and apparent magnitudes measure the brightness of astronomical objects.
The main difference between absolute and apparent magnitude is that apparent magnitude measures the observed brightness of an object from point, whereas absolute magnitude calculates the brightness of the object as seen from a standard distance away from the object.
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